edgefirst_client/

client.rs

// SPDX-License-Identifier: Apache-2.0
// Copyright © 2025 Au-Zone Technologies. All Rights Reserved.

use crate::{
    Annotation, Error, Sample, Task,
    api::{
        AnnotationSetID, Artifact, DatasetID, Experiment, ExperimentID, LoginResult, Organization,
        Project, ProjectID, SamplesCountResult, SamplesListParams, SamplesListResult, Snapshot,
        SnapshotID, SnapshotRestore, SnapshotRestoreResult, Stage, TaskID, TaskInfo, TaskStages,
        TaskStatus, TasksListParams, TasksListResult, TrainingSession, TrainingSessionID,
        ValidationSession, ValidationSessionID,
    },
    dataset::{AnnotationSet, AnnotationType, Dataset, FileType, Label, NewLabel, NewLabelObject},
};
use base64::Engine as _;
use chrono::{DateTime, Utc};
use directories::ProjectDirs;
use futures::{StreamExt as _, future::join_all};
use log::{Level, debug, error, log_enabled, trace, warn};
use reqwest::{Body, header::CONTENT_LENGTH, multipart::Form};
use serde::{Deserialize, Serialize, de::DeserializeOwned};
use std::{
    collections::HashMap,
    fs::create_dir_all,
    io::{SeekFrom, Write as _},
    path::{Path, PathBuf},
    sync::{
        Arc,
        atomic::{AtomicUsize, Ordering},
    },
    time::Duration,
    vec,
};
use tokio::{
    fs::{self, File},
    io::{AsyncReadExt as _, AsyncSeekExt as _, AsyncWriteExt as _},
    sync::{RwLock, Semaphore, mpsc::Sender},
};
use tokio_util::codec::{BytesCodec, FramedRead};
use walkdir::WalkDir;

#[cfg(feature = "polars")]
use polars::prelude::*;

static MAX_TASKS: usize = 32;
static MAX_RETRIES: u32 = 10;
static PART_SIZE: usize = 100 * 1024 * 1024;

/// Progress information for long-running operations.
///
/// This struct tracks the current progress of operations like file uploads,
/// downloads, or dataset processing. It provides the current count and total
/// count to enable progress reporting in applications.
///
/// # Examples
///
/// ```rust
/// use edgefirst_client::Progress;
///
/// let progress = Progress {
///     current: 25,
///     total: 100,
/// };
/// let percentage = (progress.current as f64 / progress.total as f64) * 100.0;
/// println!(
///     "Progress: {:.1}% ({}/{})",
///     percentage, progress.current, progress.total
/// );
/// ```
#[derive(Debug, Clone)]
pub struct Progress {
    /// Current number of completed items.
    pub current: usize,
    /// Total number of items to process.
    pub total: usize,
}

#[derive(Serialize)]
struct RpcRequest<Params> {
    id: u64,
    jsonrpc: String,
    method: String,
    params: Option<Params>,
}

impl<T> Default for RpcRequest<T> {
    fn default() -> Self {
        RpcRequest {
            id: 0,
            jsonrpc: "2.0".to_string(),
            method: "".to_string(),
            params: None,
        }
    }
}

#[derive(Deserialize)]
struct RpcError {
    code: i32,
    message: String,
}

#[derive(Deserialize)]
struct RpcResponse<RpcResult> {
    id: String,
    jsonrpc: String,
    error: Option<RpcError>,
    result: Option<RpcResult>,
}

#[derive(Deserialize)]
struct EmptyResult {}

#[derive(Debug, Serialize)]
struct SnapshotCreateParams {
    snapshot_name: String,
    keys: Vec<String>,
}

#[derive(Debug, Deserialize)]
struct SnapshotCreateResult {
    snapshot_id: SnapshotID,
    urls: Vec<String>,
}

#[derive(Debug, Serialize)]
struct SnapshotCreateMultipartParams {
    snapshot_name: String,
    keys: Vec<String>,
    file_sizes: Vec<usize>,
}

#[derive(Debug, Deserialize)]
#[serde(untagged)]
enum SnapshotCreateMultipartResultField {
    Id(u64),
    Part(SnapshotPart),
}

#[derive(Debug, Serialize)]
struct SnapshotCompleteMultipartParams {
    key: String,
    upload_id: String,
    etag_list: Vec<EtagPart>,
}

#[derive(Debug, Clone, Serialize)]
struct EtagPart {
    #[serde(rename = "ETag")]
    etag: String,
    #[serde(rename = "PartNumber")]
    part_number: usize,
}

#[derive(Debug, Clone, Deserialize)]
struct SnapshotPart {
    key: Option<String>,
    upload_id: String,
    urls: Vec<String>,
}

#[derive(Debug, Serialize)]
struct SnapshotStatusParams {
    snapshot_id: SnapshotID,
    status: String,
}

#[derive(Deserialize, Debug)]
struct SnapshotStatusResult {
    pub id: SnapshotID,
    pub uid: String,
    pub description: String,
    pub date: String,
    pub status: String,
}

#[derive(Serialize)]
struct ImageListParams {
    images_filter: ImagesFilter,
    image_files_filter: HashMap<String, String>,
    only_ids: bool,
}

#[derive(Serialize)]
struct ImagesFilter {
    dataset_id: DatasetID,
}

/// Main client for interacting with EdgeFirst Studio Server.
///
/// The EdgeFirst Client handles the connection to the EdgeFirst Studio Server
/// and manages authentication, RPC calls, and data operations. It provides
/// methods for managing projects, datasets, experiments, training sessions,
/// and various utility functions for data processing.
///
/// The client supports multiple authentication methods and can work with both
/// SaaS and self-hosted EdgeFirst Studio instances.
///
/// # Features
///
/// - **Authentication**: Token-based authentication with automatic persistence
/// - **Dataset Management**: Upload, download, and manipulate datasets
/// - **Project Operations**: Create and manage projects and experiments
/// - **Training & Validation**: Submit and monitor ML training jobs
/// - **Data Integration**: Convert between EdgeFirst datasets and popular
///   formats
/// - **Progress Tracking**: Real-time progress updates for long-running
///   operations
///
/// # Examples
///
/// ```no_run
/// use edgefirst_client::{Client, DatasetID};
/// use std::str::FromStr;
///
/// # async fn example() -> Result<(), edgefirst_client::Error> {
/// // Create a new client and authenticate
/// let mut client = Client::new()?;
/// let client = client
///     .with_login("your-email@example.com", "password")
///     .await?;
///
/// // Or use an existing token
/// let base_client = Client::new()?;
/// let client = base_client.with_token("your-token-here")?;
///
/// // Get organization and projects
/// let org = client.organization().await?;
/// let projects = client.projects(None).await?;
///
/// // Work with datasets
/// let dataset_id = DatasetID::from_str("ds-abc123")?;
/// let dataset = client.dataset(dataset_id).await?;
/// # Ok(())
/// # }
/// ```
#[derive(Clone, Debug)]
pub struct Client {
    http: reqwest::Client,
    url: String,
    token: Arc<RwLock<String>>,
    token_path: Option<PathBuf>,
}

impl Client {
    /// Create a new unauthenticated client with the default saas server.  To
    /// connect to a different server use the `with_server` method or with the
    /// `with_token` method to create a client with a token which includes the
    /// server instance name (test, stage, saas).
    ///
    /// This client is created without a token and will need to login before
    /// using any methods that require authentication.  Use the `with_token`
    /// method to create a client with a token.
    pub fn new() -> Result<Self, Error> {
        Ok(Client {
            http: reqwest::Client::builder()
                .read_timeout(Duration::from_secs(60))
                .build()?,
            url: "https://edgefirst.studio".to_string(),
            token: Arc::new(tokio::sync::RwLock::new("".to_string())),
            token_path: None,
        })
    }

    /// Returns a new client connected to the specified server instance.  If a
    /// token is already set in the client then it will be dropped as the token
    /// is specific to the server instance.
    pub fn with_server(&self, server: &str) -> Result<Self, Error> {
        Ok(Client {
            url: format!("https://{}.edgefirst.studio", server),
            ..self.clone()
        })
    }

    /// Returns a new client authenticated with the provided username and
    /// password.
    pub async fn with_login(&self, username: &str, password: &str) -> Result<Self, Error> {
        let params = HashMap::from([("username", username), ("password", password)]);
        let login: LoginResult = self
            .rpc_without_auth("auth.login".to_owned(), Some(params))
            .await?;
        Ok(Client {
            token: Arc::new(tokio::sync::RwLock::new(login.token)),
            ..self.clone()
        })
    }

    /// Returns a new client which will load and save the token to the specified
    /// path.
    pub fn with_token_path(&self, token_path: Option<&Path>) -> Result<Self, Error> {
        let token_path = match token_path {
            Some(path) => path.to_path_buf(),
            None => ProjectDirs::from("ai", "EdgeFirst", "EdgeFirst Studio")
                .unwrap()
                .config_dir()
                .join("token"),
        };

        debug!("Using token path: {:?}", token_path);

        let token = match token_path.exists() {
            true => std::fs::read_to_string(&token_path)?,
            false => "".to_string(),
        };

        if !token.is_empty() {
            let client = self.with_token(&token)?;
            Ok(Client {
                token_path: Some(token_path),
                ..client
            })
        } else {
            Ok(Client {
                token_path: Some(token_path),
                ..self.clone()
            })
        }
    }

    /// Returns a new client authenticated with the provided token.
    pub fn with_token(&self, token: &str) -> Result<Self, Error> {
        if token.is_empty() {
            return Ok(self.clone());
        }

        let token_parts: Vec<&str> = token.split('.').collect();
        if token_parts.len() != 3 {
            return Err(Error::InvalidToken);
        }

        let decoded = base64::engine::general_purpose::STANDARD_NO_PAD
            .decode(token_parts[1])
            .unwrap();
        let payload: HashMap<String, serde_json::Value> = serde_json::from_slice(&decoded)?;
        let server = match payload.get("database") {
            Some(value) => Ok(value.as_str().unwrap().to_string()),
            None => Err(Error::InvalidToken),
        }?;

        Ok(Client {
            url: format!("https://{}.edgefirst.studio", server),
            token: Arc::new(tokio::sync::RwLock::new(token.to_string())),
            ..self.clone()
        })
    }

    pub async fn save_token(&self) -> Result<(), Error> {
        let path = self.token_path.clone().unwrap_or_else(|| {
            ProjectDirs::from("ai", "EdgeFirst", "EdgeFirst Studio")
                .unwrap()
                .config_dir()
                .join("token")
        });

        create_dir_all(path.parent().unwrap())?;
        let mut file = std::fs::File::create(&path)?;
        file.write_all(self.token.read().await.as_bytes())?;

        debug!("Saved token to {:?}", path);

        Ok(())
    }

    /// Return the version of the EdgeFirst Studio server for the current
    /// client connection.
    pub async fn version(&self) -> Result<String, Error> {
        let version: HashMap<String, String> = self
            .rpc_without_auth::<(), HashMap<String, String>>("version".to_owned(), None)
            .await?;
        let version = version.get("version").ok_or(Error::InvalidResponse)?;
        Ok(version.to_owned())
    }

    /// Clear the token used to authenticate the client with the server.  If an
    /// optional path was provided when creating the client, the token file
    /// will also be cleared.
    pub async fn logout(&self) -> Result<(), Error> {
        {
            let mut token = self.token.write().await;
            *token = "".to_string();
        }

        if let Some(path) = &self.token_path
            && path.exists()
        {
            fs::remove_file(path).await?;
        }

        Ok(())
    }

    /// Return the token used to authenticate the client with the server.  When
    /// logging into the server using a username and password, the token is
    /// returned by the server and stored in the client for future interactions.
    pub async fn token(&self) -> String {
        self.token.read().await.clone()
    }

    /// Verify the token used to authenticate the client with the server.  This
    /// method is used to ensure that the token is still valid and has not
    /// expired.  If the token is invalid, the server will return an error and
    /// the client will need to login again.
    pub async fn verify_token(&self) -> Result<(), Error> {
        self.rpc::<(), LoginResult>("auth.verify_token".to_owned(), None)
            .await?;
        Ok::<(), Error>(())
    }

    /// Renew the token used to authenticate the client with the server.  This
    /// method is used to refresh the token before it expires.  If the token
    /// has already expired, the server will return an error and the client
    /// will need to login again.
    pub async fn renew_token(&self) -> Result<(), Error> {
        let params = HashMap::from([("username".to_string(), self.username().await?)]);
        let result: LoginResult = self
            .rpc_without_auth("auth.refresh".to_owned(), Some(params))
            .await?;

        {
            let mut token = self.token.write().await;
            *token = result.token;
        }

        if self.token_path.is_some() {
            self.save_token().await?;
        }

        Ok(())
    }

    async fn token_field(&self, field: &str) -> Result<serde_json::Value, Error> {
        let token = self.token.read().await;
        if token.is_empty() {
            return Err(Error::EmptyToken);
        }

        let token_parts: Vec<&str> = token.split('.').collect();
        if token_parts.len() != 3 {
            return Err(Error::InvalidToken);
        }

        let decoded = base64::engine::general_purpose::STANDARD_NO_PAD
            .decode(token_parts[1])
            .unwrap();
        let payload: HashMap<String, serde_json::Value> = serde_json::from_slice(&decoded)?;
        match payload.get(field) {
            Some(value) => Ok(value.to_owned()),
            None => Err(Error::InvalidToken),
        }
    }

    /// Returns the URL of the EdgeFirst Studio server for the current client.
    pub fn url(&self) -> &str {
        &self.url
    }

    /// Returns the username associated with the current token.
    pub async fn username(&self) -> Result<String, Error> {
        match self.token_field("username").await? {
            serde_json::Value::String(username) => Ok(username),
            _ => Err(Error::InvalidToken),
        }
    }

    /// Returns the expiration time for the current token.
    pub async fn token_expiration(&self) -> Result<DateTime<Utc>, Error> {
        let ts = match self.token_field("exp").await? {
            serde_json::Value::Number(exp) => exp.as_i64().ok_or(Error::InvalidToken)?,
            _ => return Err(Error::InvalidToken),
        };

        match DateTime::<Utc>::from_timestamp_secs(ts) {
            Some(dt) => Ok(dt),
            None => Err(Error::InvalidToken),
        }
    }

    /// Returns the organization information for the current user.
    pub async fn organization(&self) -> Result<Organization, Error> {
        self.rpc::<(), Organization>("org.get".to_owned(), None)
            .await
    }

    /// Returns a list of projects available to the user.  The projects are
    /// returned as a vector of Project objects.  If a name filter is
    /// provided, only projects matching the filter are returned.
    ///
    /// Projects are the top-level organizational unit in EdgeFirst Studio.
    /// Projects contain datasets, trainers, and trainer sessions.  Projects
    /// are used to group related datasets and trainers together.
    pub async fn projects(&self, name: Option<&str>) -> Result<Vec<Project>, Error> {
        let projects = self
            .rpc::<(), Vec<Project>>("project.list".to_owned(), None)
            .await?;
        if let Some(name) = name {
            Ok(projects
                .into_iter()
                .filter(|p| p.name().contains(name))
                .collect())
        } else {
            Ok(projects)
        }
    }

    /// Return the project with the specified project ID.  If the project does
    /// not exist, an error is returned.
    pub async fn project(&self, project_id: ProjectID) -> Result<Project, Error> {
        let params = HashMap::from([("project_id", project_id)]);
        self.rpc("project.get".to_owned(), Some(params)).await
    }

    /// Returns a list of datasets available to the user.  The datasets are
    /// returned as a vector of Dataset objects.  If a name filter is
    /// provided, only datasets matching the filter are returned.
    pub async fn datasets(
        &self,
        project_id: ProjectID,
        name: Option<&str>,
    ) -> Result<Vec<Dataset>, Error> {
        let params = HashMap::from([("project_id", project_id)]);
        let datasets: Vec<Dataset> = self.rpc("dataset.list".to_owned(), Some(params)).await?;
        if let Some(name) = name {
            Ok(datasets
                .into_iter()
                .filter(|d| d.name().contains(name))
                .collect())
        } else {
            Ok(datasets)
        }
    }

    /// Return the dataset with the specified dataset ID.  If the dataset does
    /// not exist, an error is returned.
    pub async fn dataset(&self, dataset_id: DatasetID) -> Result<Dataset, Error> {
        let params = HashMap::from([("dataset_id", dataset_id)]);
        self.rpc("dataset.get".to_owned(), Some(params)).await
    }

    /// Lists the labels for the specified dataset.
    pub async fn labels(&self, dataset_id: DatasetID) -> Result<Vec<Label>, Error> {
        let params = HashMap::from([("dataset_id", dataset_id)]);
        self.rpc("label.list".to_owned(), Some(params)).await
    }

    /// Add a new label to the dataset with the specified name.
    pub async fn add_label(&self, dataset_id: DatasetID, name: &str) -> Result<(), Error> {
        let new_label = NewLabel {
            dataset_id,
            labels: vec![NewLabelObject {
                name: name.to_owned(),
            }],
        };
        let _: String = self.rpc("label.add2".to_owned(), Some(new_label)).await?;
        Ok(())
    }

    /// Removes the label with the specified ID from the dataset.  Label IDs are
    /// globally unique so the dataset_id is not required.
    pub async fn remove_label(&self, label_id: u64) -> Result<(), Error> {
        let params = HashMap::from([("label_id", label_id)]);
        let _: String = self.rpc("label.del".to_owned(), Some(params)).await?;
        Ok(())
    }

    /// Updates the label with the specified ID to have the new name or index.
    /// Label IDs cannot be changed.  Label IDs are globally unique so the
    /// dataset_id is not required.
    pub async fn update_label(&self, label: &Label) -> Result<(), Error> {
        #[derive(Serialize)]
        struct Params {
            dataset_id: DatasetID,
            label_id: u64,
            label_name: String,
            label_index: u64,
        }

        let _: String = self
            .rpc(
                "label.update".to_owned(),
                Some(Params {
                    dataset_id: label.dataset_id(),
                    label_id: label.id(),
                    label_name: label.name().to_owned(),
                    label_index: label.index(),
                }),
            )
            .await?;
        Ok(())
    }

    pub async fn download_dataset(
        &self,
        dataset_id: DatasetID,
        groups: &[String],
        file_types: &[FileType],
        output: PathBuf,
        progress: Option<Sender<Progress>>,
    ) -> Result<(), Error> {
        let samples = self
            .samples(dataset_id, None, &[], groups, file_types, progress.clone())
            .await?;
        fs::create_dir_all(&output).await?;

        let total = samples.len();
        let current = Arc::new(AtomicUsize::new(0));
        let sem = Arc::new(Semaphore::new(MAX_TASKS));

        let tasks = samples
            .into_iter()
            .map(|sample| {
                let sem = sem.clone();
                let client = self.clone();
                let current = current.clone();
                let progress = progress.clone();
                let file_types = file_types.to_vec();
                let output = output.clone();

                tokio::spawn(async move {
                    let _permit = sem.acquire().await.unwrap();

                    for file_type in file_types {
                        if let Some(data) = sample.download(&client, file_type.clone()).await? {
                            let file_ext = match file_type {
                                FileType::Image => infer::get(&data)
                                    .expect("Failed to identify image file format for sample")
                                    .extension()
                                    .to_string(),
                                t => t.to_string(),
                            };

                            let file_name = format!("{}.{}", sample.name(), file_ext);
                            let file_path = output.join(&file_name);

                            let mut file = File::create(&file_path).await?;
                            file.write_all(&data).await?;
                        } else {
                            warn!("No data for sample: {}", sample.id());
                        }
                    }

                    if let Some(progress) = &progress {
                        let current = current.fetch_add(1, Ordering::SeqCst);
                        progress
                            .send(Progress {
                                current: current + 1,
                                total,
                            })
                            .await
                            .unwrap();
                    }

                    Ok::<(), Error>(())
                })
            })
            .collect::<Vec<_>>();

        join_all(tasks)
            .await
            .into_iter()
            .collect::<Result<Vec<_>, _>>()?;

        if let Some(progress) = progress {
            drop(progress);
        }

        Ok(())
    }

    /// List available annotation sets for the specified dataset.
    pub async fn annotation_sets(
        &self,
        dataset_id: DatasetID,
    ) -> Result<Vec<AnnotationSet>, Error> {
        let params = HashMap::from([("dataset_id", dataset_id)]);
        self.rpc("annset.list".to_owned(), Some(params)).await
    }

    /// Retrieve the annotation set with the specified ID.
    pub async fn annotation_set(
        &self,
        annotation_set_id: AnnotationSetID,
    ) -> Result<AnnotationSet, Error> {
        let params = HashMap::from([("annotation_set_id", annotation_set_id)]);
        self.rpc("annset.get".to_owned(), Some(params)).await
    }

    /// Get the annotations for the specified annotation set with the
    /// requested annotation types.  The annotation types are used to filter
    /// the annotations returned.  The groups parameter is used to filter for
    /// dataset groups (train, val, test).  Images which do not have any
    /// annotations are also included in the result as long as they are in the
    /// requested groups (when specified).
    ///
    /// The result is a vector of Annotations objects which contain the
    /// full dataset along with the annotations for the specified types.
    ///
    /// To get the annotations as a DataFrame, use the `annotations_dataframe`
    /// method instead.
    pub async fn annotations(
        &self,
        annotation_set_id: AnnotationSetID,
        groups: &[String],
        annotation_types: &[AnnotationType],
        progress: Option<Sender<Progress>>,
    ) -> Result<Vec<Annotation>, Error> {
        let dataset_id = self.annotation_set(annotation_set_id).await?.dataset_id();
        let labels = self
            .labels(dataset_id)
            .await?
            .into_iter()
            .map(|label| (label.name().to_string(), label.index()))
            .collect::<HashMap<_, _>>();
        let total = self
            .samples_count(
                dataset_id,
                Some(annotation_set_id),
                annotation_types,
                groups,
                &[],
            )
            .await?
            .total as usize;
        let mut annotations = vec![];
        let mut continue_token: Option<String> = None;
        let mut current = 0;

        if total == 0 {
            return Ok(annotations);
        }

        loop {
            let params = SamplesListParams {
                dataset_id,
                annotation_set_id: Some(annotation_set_id),
                types: annotation_types.iter().map(|t| t.to_string()).collect(),
                group_names: groups.to_vec(),
                continue_token,
            };

            let result: SamplesListResult =
                self.rpc("samples.list".to_owned(), Some(params)).await?;
            current += result.samples.len();
            continue_token = result.continue_token;

            if result.samples.is_empty() {
                break;
            }

            for sample in result.samples {
                // If there are no annotations for the sample, create an empty
                // annotation for the sample so that it is included in the result.
                if sample.annotations().is_empty() {
                    let mut annotation = Annotation::new();
                    annotation.set_sample_id(Some(sample.id()));
                    annotation.set_name(Some(sample.name().to_string()));
                    annotation.set_group(sample.group().cloned());
                    annotation.set_sequence_name(sample.sequence_name().cloned());
                    annotations.push(annotation);
                    continue;
                }

                sample.annotations().iter().for_each(|annotation| {
                    let mut annotation = annotation.clone();
                    annotation.set_sample_id(Some(sample.id()));
                    annotation.set_name(Some(sample.name().to_string()));
                    annotation.set_group(sample.group().cloned());
                    annotation.set_sequence_name(sample.sequence_name().cloned());
                    annotation.set_label_index(Some(labels[annotation.label().unwrap().as_str()]));
                    annotations.push(annotation);
                });
            }

            if let Some(progress) = &progress {
                progress.send(Progress { current, total }).await.unwrap();
            }

            match &continue_token {
                Some(token) if !token.is_empty() => continue,
                _ => break,
            }
        }

        if let Some(progress) = progress {
            drop(progress);
        }

        Ok(annotations)
    }

    pub async fn samples_count(
        &self,
        dataset_id: DatasetID,
        annotation_set_id: Option<AnnotationSetID>,
        annotation_types: &[AnnotationType],
        groups: &[String],
        types: &[FileType],
    ) -> Result<SamplesCountResult, Error> {
        let types = annotation_types
            .iter()
            .map(|t| t.to_string())
            .chain(types.iter().map(|t| t.to_string()))
            .collect::<Vec<_>>();

        let params = SamplesListParams {
            dataset_id,
            annotation_set_id,
            group_names: groups.to_vec(),
            types,
            continue_token: None,
        };

        self.rpc("samples.count".to_owned(), Some(params)).await
    }

    pub async fn samples(
        &self,
        dataset_id: DatasetID,
        annotation_set_id: Option<AnnotationSetID>,
        annotation_types: &[AnnotationType],
        groups: &[String],
        types: &[FileType],
        progress: Option<Sender<Progress>>,
    ) -> Result<Vec<Sample>, Error> {
        let types = annotation_types
            .iter()
            .map(|t| t.to_string())
            .chain(types.iter().map(|t| t.to_string()))
            .collect::<Vec<_>>();
        let labels = self
            .labels(dataset_id)
            .await?
            .into_iter()
            .map(|label| (label.name().to_string(), label.index()))
            .collect::<HashMap<_, _>>();
        let total = self
            .samples_count(dataset_id, annotation_set_id, annotation_types, groups, &[])
            .await?
            .total as usize;

        let mut samples = vec![];
        let mut continue_token: Option<String> = None;
        let mut current = 0;

        if total == 0 {
            return Ok(samples);
        }

        loop {
            let params = SamplesListParams {
                dataset_id,
                annotation_set_id,
                types: types.clone(),
                group_names: groups.to_vec(),
                continue_token: continue_token.clone(),
            };

            let result: SamplesListResult =
                self.rpc("samples.list".to_owned(), Some(params)).await?;
            current += result.samples.len();
            continue_token = result.continue_token;

            if result.samples.is_empty() {
                break;
            }

            samples.append(
                &mut result
                    .samples
                    .into_iter()
                    .map(|s| {
                        let mut anns = s.annotations().to_vec();
                        for ann in &mut anns {
                            if let Some(label) = ann.label() {
                                ann.set_label_index(Some(labels[label.as_str()]));
                            }
                        }
                        s.with_annotations(anns)
                    })
                    .collect::<Vec<_>>(),
            );

            if let Some(progress) = &progress {
                progress.send(Progress { current, total }).await.unwrap();
            }

            match &continue_token {
                Some(token) if !token.is_empty() => continue,
                _ => break,
            }
        }

        if let Some(progress) = progress {
            drop(progress);
        }

        Ok(samples)
    }

    pub async fn download(&self, url: &str) -> Result<Vec<u8>, Error> {
        for attempt in 1..MAX_RETRIES {
            let resp = match self.http.get(url).send().await {
                Ok(resp) => resp,
                Err(err) => {
                    warn!(
                        "Socket Error [retry {}/{}]: {:?}",
                        attempt, MAX_RETRIES, err
                    );
                    tokio::time::sleep(Duration::from_secs(1) * attempt).await;
                    continue;
                }
            };

            match resp.bytes().await {
                Ok(body) => return Ok(body.to_vec()),
                Err(err) => {
                    warn!("HTTP Error [retry {}/{}]: {:?}", attempt, MAX_RETRIES, err);
                    tokio::time::sleep(Duration::from_secs(1) * attempt).await;
                    continue;
                }
            };
        }

        Err(Error::MaxRetriesExceeded(MAX_RETRIES))
    }

    /// Get the AnnotationGroup for the specified annotation set with the
    /// requested annotation types.  The annotation type is used to filter
    /// the annotations returned.  Images which do not have any annotations
    /// are included in the result.
    ///
    /// The result is a DataFrame following the EdgeFirst Dataset Format
    /// definition.
    ///
    /// To get the annotations as a vector of AnnotationGroup objects, use the
    /// `annotations` method instead.
    #[cfg(feature = "polars")]
    pub async fn annotations_dataframe(
        &self,
        annotation_set_id: AnnotationSetID,
        groups: &[String],
        types: &[AnnotationType],
        progress: Option<Sender<Progress>>,
    ) -> Result<DataFrame, Error> {
        use crate::dataset::annotations_dataframe;

        let annotations = self
            .annotations(annotation_set_id, groups, types, progress)
            .await?;
        Ok(annotations_dataframe(&annotations))
    }

    /// List available snapshots.  If a name is provided, only snapshots
    /// containing that name are returned.
    pub async fn snapshots(&self, name: Option<&str>) -> Result<Vec<Snapshot>, Error> {
        let snapshots: Vec<Snapshot> = self
            .rpc::<(), Vec<Snapshot>>("snapshots.list".to_owned(), None)
            .await?;
        if let Some(name) = name {
            Ok(snapshots
                .into_iter()
                .filter(|s| s.description().contains(name))
                .collect())
        } else {
            Ok(snapshots)
        }
    }

    /// Get the snapshot with the specified id.
    pub async fn snapshot(&self, snapshot_id: SnapshotID) -> Result<Snapshot, Error> {
        let params = HashMap::from([("snapshot_id", snapshot_id)]);
        self.rpc("snapshots.get".to_owned(), Some(params)).await
    }

    /// Create a new snapshot from the file at the specified path.  If the path
    /// is a directory then all the files in the directory are uploaded.  The
    /// snapshot name will be the specified path, either file or directory.
    ///
    /// The progress callback can be used to monitor the progress of the upload
    /// over a watch channel.
    pub async fn create_snapshot(
        &self,
        path: &str,
        progress: Option<Sender<Progress>>,
    ) -> Result<Snapshot, Error> {
        let path = Path::new(path);

        if path.is_dir() {
            return self
                .create_snapshot_folder(path.to_str().unwrap(), progress)
                .await;
        }

        let name = path.file_name().unwrap().to_str().unwrap();
        let total = path.metadata()?.len() as usize;
        let current = Arc::new(AtomicUsize::new(0));

        if let Some(progress) = &progress {
            progress.send(Progress { current: 0, total }).await.unwrap();
        }

        let params = SnapshotCreateMultipartParams {
            snapshot_name: name.to_owned(),
            keys: vec![name.to_owned()],
            file_sizes: vec![total],
        };
        let multipart: HashMap<String, SnapshotCreateMultipartResultField> = self
            .rpc(
                "snapshots.create_upload_url_multipart".to_owned(),
                Some(params),
            )
            .await?;

        let snapshot_id = match multipart.get("snapshot_id") {
            Some(SnapshotCreateMultipartResultField::Id(id)) => SnapshotID::from(*id),
            _ => return Err(Error::InvalidResponse),
        };

        let snapshot = self.snapshot(snapshot_id).await?;
        let part_prefix = snapshot.path().split("::/").last().unwrap().to_owned();
        let part_key = format!("{}/{}", part_prefix, name);
        let mut part = match multipart.get(&part_key) {
            Some(SnapshotCreateMultipartResultField::Part(part)) => part,
            _ => return Err(Error::InvalidResponse),
        }
        .clone();
        part.key = Some(part_key);

        let params = upload_multipart(
            self.http.clone(),
            part.clone(),
            path.to_path_buf(),
            total,
            current,
            progress.clone(),
        )
        .await?;

        let complete: String = self
            .rpc(
                "snapshots.complete_multipart_upload".to_owned(),
                Some(params),
            )
            .await?;
        debug!("Snapshot Multipart Complete: {:?}", complete);

        let params: SnapshotStatusParams = SnapshotStatusParams {
            snapshot_id,
            status: "available".to_owned(),
        };
        let _: SnapshotStatusResult = self
            .rpc("snapshots.update".to_owned(), Some(params))
            .await?;

        if let Some(progress) = progress {
            drop(progress);
        }

        self.snapshot(snapshot_id).await
    }

    async fn create_snapshot_folder(
        &self,
        path: &str,
        progress: Option<Sender<Progress>>,
    ) -> Result<Snapshot, Error> {
        let path = Path::new(path);
        let name = path.file_name().unwrap().to_str().unwrap();

        let files = WalkDir::new(path)
            .into_iter()
            .filter_map(|entry| entry.ok())
            .filter(|entry| entry.file_type().is_file())
            .map(|entry| entry.path().strip_prefix(path).unwrap().to_owned())
            .collect::<Vec<_>>();

        let total = files
            .iter()
            .map(|file| path.join(file).metadata().unwrap().len() as usize)
            .sum();
        let current = Arc::new(AtomicUsize::new(0));

        if let Some(progress) = &progress {
            progress.send(Progress { current: 0, total }).await.unwrap();
        }

        let keys = files
            .iter()
            .map(|key| key.to_str().unwrap().to_owned())
            .collect::<Vec<_>>();
        let file_sizes = files
            .iter()
            .map(|key| path.join(key).metadata().unwrap().len() as usize)
            .collect::<Vec<_>>();

        let params = SnapshotCreateMultipartParams {
            snapshot_name: name.to_owned(),
            keys,
            file_sizes,
        };

        let multipart: HashMap<String, SnapshotCreateMultipartResultField> = self
            .rpc(
                "snapshots.create_upload_url_multipart".to_owned(),
                Some(params),
            )
            .await?;

        let snapshot_id = match multipart.get("snapshot_id") {
            Some(SnapshotCreateMultipartResultField::Id(id)) => SnapshotID::from(*id),
            _ => return Err(Error::InvalidResponse),
        };

        let snapshot = self.snapshot(snapshot_id).await?;
        let part_prefix = snapshot.path().split("::/").last().unwrap().to_owned();

        for file in files {
            let part_key = format!("{}/{}", part_prefix, file.to_str().unwrap());
            let mut part = match multipart.get(&part_key) {
                Some(SnapshotCreateMultipartResultField::Part(part)) => part,
                _ => return Err(Error::InvalidResponse),
            }
            .clone();
            part.key = Some(part_key);

            let params = upload_multipart(
                self.http.clone(),
                part.clone(),
                path.join(file),
                total,
                current.clone(),
                progress.clone(),
            )
            .await?;

            let complete: String = self
                .rpc(
                    "snapshots.complete_multipart_upload".to_owned(),
                    Some(params),
                )
                .await?;
            debug!("Snapshot Part Complete: {:?}", complete);
        }

        let params = SnapshotStatusParams {
            snapshot_id,
            status: "available".to_owned(),
        };
        let _: SnapshotStatusResult = self
            .rpc("snapshots.update".to_owned(), Some(params))
            .await?;

        if let Some(progress) = progress {
            drop(progress);
        }

        self.snapshot(snapshot_id).await
    }

    /// Downloads a snapshot from the server.  The snapshot could be a single
    /// file or a directory of files.  The snapshot is downloaded to the
    /// specified path.  A progress callback can be provided to monitor the
    /// progress of the download over a watch channel.
    pub async fn download_snapshot(
        &self,
        snapshot_id: SnapshotID,
        output: PathBuf,
        progress: Option<Sender<Progress>>,
    ) -> Result<(), Error> {
        fs::create_dir_all(&output).await?;

        let params = HashMap::from([("snapshot_id", snapshot_id)]);
        let items: HashMap<String, String> = self
            .rpc("snapshots.create_download_url".to_owned(), Some(params))
            .await?;

        let total = Arc::new(AtomicUsize::new(0));
        let current = Arc::new(AtomicUsize::new(0));
        let sem = Arc::new(Semaphore::new(MAX_TASKS));

        let tasks = items
            .iter()
            .map(|(key, url)| {
                let http = self.http.clone();
                let key = key.clone();
                let url = url.clone();
                let output = output.clone();
                let progress = progress.clone();
                let current = current.clone();
                let total = total.clone();
                let sem = sem.clone();

                tokio::spawn(async move {
                    let _permit = sem.acquire().await.unwrap();
                    let res = http.get(url).send().await.unwrap();
                    let content_length = res.content_length().unwrap() as usize;

                    if let Some(progress) = &progress {
                        let total = total.fetch_add(content_length, Ordering::SeqCst);
                        progress
                            .send(Progress {
                                current: current.load(Ordering::SeqCst),
                                total: total + content_length,
                            })
                            .await
                            .unwrap();
                    }

                    let mut file = File::create(output.join(key)).await.unwrap();
                    let mut stream = res.bytes_stream();

                    while let Some(chunk) = stream.next().await {
                        let chunk = chunk.unwrap();
                        file.write_all(&chunk).await.unwrap();
                        let len = chunk.len();

                        if let Some(progress) = &progress {
                            let total = total.load(Ordering::SeqCst);
                            let current = current.fetch_add(len, Ordering::SeqCst);

                            progress
                                .send(Progress {
                                    current: current + len,
                                    total,
                                })
                                .await
                                .unwrap();
                        }
                    }
                })
            })
            .collect::<Vec<_>>();

        join_all(tasks)
            .await
            .into_iter()
            .collect::<Result<Vec<_>, _>>()
            .unwrap();

        Ok(())
    }

    /// The snapshot restore method is used to restore a snapshot to the server.
    /// The restore method can perform a few different operations depending on
    /// the snapshot type.
    ///
    /// The auto-annotation workflow is used to automatically annotate the
    /// dataset with 2D masks and boxes using the labels within the
    /// autolabel list. If autolabel is empty then the auto-annotation
    /// workflow is not used. If the MCAP includes radar or LiDAR data then
    /// the auto-annotation workflow will also generate 3D bounding boxes
    /// for detected objects.
    ///
    /// The autodepth flag is used to determine if a depthmap should be
    /// automatically generated for the dataset, this will currently only work
    /// accurately for Maivin or Raivin cameras.
    pub async fn restore_snapshot(
        &self,
        project_id: ProjectID,
        snapshot_id: SnapshotID,
        topics: &[String],
        autolabel: &[String],
        autodepth: bool,
        dataset_name: Option<&str>,
        dataset_description: Option<&str>,
    ) -> Result<SnapshotRestoreResult, Error> {
        let params = SnapshotRestore {
            project_id,
            snapshot_id,
            fps: 1,
            autodepth,
            agtg_pipeline: !autolabel.is_empty(),
            autolabel: autolabel.to_vec(),
            topics: topics.to_vec(),
            dataset_name: dataset_name.map(|s| s.to_owned()),
            dataset_description: dataset_description.map(|s| s.to_owned()),
        };
        self.rpc("snapshots.restore".to_owned(), Some(params)).await
    }

    /// Returns a list of experiments available to the user.  The experiments
    /// are returned as a vector of Experiment objects.  If name is provided
    /// then only experiments containing this string are returned.
    ///
    /// Experiments provide a method of organizing training and validation
    /// sessions together and are akin to an Experiment in MLFlow terminology.  
    /// Each experiment can have multiple trainer sessions associated with it,
    /// these would be akin to runs in MLFlow terminology.
    pub async fn experiments(
        &self,
        project_id: ProjectID,
        name: Option<&str>,
    ) -> Result<Vec<Experiment>, Error> {
        let params = HashMap::from([("project_id", project_id)]);
        let experiments: Vec<Experiment> =
            self.rpc("trainer.list2".to_owned(), Some(params)).await?;
        if let Some(name) = name {
            Ok(experiments
                .into_iter()
                .filter(|e| e.name().contains(name))
                .collect())
        } else {
            Ok(experiments)
        }
    }

    /// Return the experiment with the specified experiment ID.  If the
    /// experiment does not exist, an error is returned.
    pub async fn experiment(&self, experiment_id: ExperimentID) -> Result<Experiment, Error> {
        let params = HashMap::from([("trainer_id", experiment_id)]);
        self.rpc("trainer.get".to_owned(), Some(params)).await
    }

    /// Returns a list of trainer sessions available to the user.  The trainer
    /// sessions are returned as a vector of TrainingSession objects.  If name
    /// is provided then only trainer sessions containing this string are
    /// returned.
    ///
    /// Trainer sessions are akin to runs in MLFlow terminology.  These
    /// represent an actual training session which will produce metrics and
    /// model artifacts.
    pub async fn training_sessions(
        &self,
        experiment_id: ExperimentID,
        name: Option<&str>,
    ) -> Result<Vec<TrainingSession>, Error> {
        let params = HashMap::from([("trainer_id", experiment_id)]);
        let sessions: Vec<TrainingSession> = self
            .rpc("trainer.session.list".to_owned(), Some(params))
            .await?;
        if let Some(name) = name {
            Ok(sessions
                .into_iter()
                .filter(|s| s.name().contains(name))
                .collect())
        } else {
            Ok(sessions)
        }
    }

    /// Return the trainer session with the specified trainer session ID.  If
    /// the trainer session does not exist, an error is returned.
    pub async fn training_session(
        &self,
        session_id: TrainingSessionID,
    ) -> Result<TrainingSession, Error> {
        let params = HashMap::from([("trainer_session_id", session_id)]);
        self.rpc("trainer.session.get".to_owned(), Some(params))
            .await
    }

    /// List validation sessions for the given project.
    pub async fn validation_sessions(
        &self,
        project_id: ProjectID,
    ) -> Result<Vec<ValidationSession>, Error> {
        let params = HashMap::from([("project_id", project_id)]);
        self.rpc("validate.session.list".to_owned(), Some(params))
            .await
    }

    /// Retrieve a specific validation session.
    pub async fn validation_session(
        &self,
        session_id: ValidationSessionID,
    ) -> Result<ValidationSession, Error> {
        let params = HashMap::from([("validate_session_id", session_id)]);
        self.rpc("validate.session.get".to_owned(), Some(params))
            .await
    }

    /// List the artifacts for the specified trainer session.  The artifacts
    /// are returned as a vector of strings.
    pub async fn artifacts(
        &self,
        training_session_id: TrainingSessionID,
    ) -> Result<Vec<Artifact>, Error> {
        let params = HashMap::from([("training_session_id", training_session_id)]);
        self.rpc("trainer.get_artifacts".to_owned(), Some(params))
            .await
    }

    /// Download the model artifact for the specified trainer session to the
    /// specified file path, if path is not provided it will be downloaded to
    /// the current directory with the same filename.  A progress callback can
    /// be provided to monitor the progress of the download over a watch
    /// channel.
    pub async fn download_artifact(
        &self,
        training_session_id: TrainingSessionID,
        modelname: &str,
        filename: Option<PathBuf>,
        progress: Option<Sender<Progress>>,
    ) -> Result<(), Error> {
        let filename = filename.unwrap_or_else(|| PathBuf::from(modelname));
        let resp = self
            .http
            .get(format!(
                "{}/download_model?training_session_id={}&file={}",
                self.url,
                training_session_id.value(),
                modelname
            ))
            .header("Authorization", format!("Bearer {}", self.token().await))
            .send()
            .await?;
        if !resp.status().is_success() {
            let err = resp.error_for_status_ref().unwrap_err();
            return Err(Error::HttpError(err));
        }

        fs::create_dir_all(filename.parent().unwrap()).await?;

        if let Some(progress) = progress {
            let total = resp.content_length().unwrap() as usize;
            progress.send(Progress { current: 0, total }).await.unwrap();

            let mut file = File::create(filename).await?;
            let mut current = 0;
            let mut stream = resp.bytes_stream();

            while let Some(item) = stream.next().await {
                let chunk = item?;
                file.write_all(&chunk).await?;
                current += chunk.len();
                progress.send(Progress { current, total }).await.unwrap();
            }
        } else {
            let body = resp.bytes().await?;
            fs::write(filename, body).await?;
        }

        Ok(())
    }

    /// Download the model checkpoint associated with the specified trainer
    /// session to the specified file path, if path is not provided it will be
    /// downloaded to the current directory with the same filename.  A progress
    /// callback can be provided to monitor the progress of the download over a
    /// watch channel.
    ///
    /// There is no API for listing checkpoints it is expected that trainers are
    /// aware of possible checkpoints and their names within the checkpoint
    /// folder on the server.
    pub async fn download_checkpoint(
        &self,
        training_session_id: TrainingSessionID,
        checkpoint: &str,
        filename: Option<PathBuf>,
        progress: Option<Sender<Progress>>,
    ) -> Result<(), Error> {
        let filename = filename.unwrap_or_else(|| PathBuf::from(checkpoint));
        let resp = self
            .http
            .get(format!(
                "{}/download_checkpoint?folder=checkpoints&training_session_id={}&file={}",
                self.url,
                training_session_id.value(),
                checkpoint
            ))
            .header("Authorization", format!("Bearer {}", self.token().await))
            .send()
            .await?;
        if !resp.status().is_success() {
            let err = resp.error_for_status_ref().unwrap_err();
            return Err(Error::HttpError(err));
        }

        fs::create_dir_all(filename.parent().unwrap()).await?;

        if let Some(progress) = progress {
            let total = resp.content_length().unwrap() as usize;
            progress.send(Progress { current: 0, total }).await.unwrap();

            let mut file = File::create(filename).await?;
            let mut current = 0;
            let mut stream = resp.bytes_stream();

            while let Some(item) = stream.next().await {
                let chunk = item?;
                file.write_all(&chunk).await?;
                current += chunk.len();
                progress.send(Progress { current, total }).await.unwrap();
            }
        } else {
            let body = resp.bytes().await?;
            fs::write(filename, body).await?;
        }

        Ok(())
    }

    /// Return a list of tasks for the current user.
    pub async fn tasks(
        &self,
        name: Option<&str>,
        workflow: Option<&str>,
        status: Option<&str>,
        manager: Option<&str>,
    ) -> Result<Vec<Task>, Error> {
        let mut params = TasksListParams {
            continue_token: None,
            status: status.map(|s| vec![s.to_owned()]),
            manager: manager.map(|m| vec![m.to_owned()]),
        };
        let mut tasks = Vec::new();

        loop {
            let result = self
                .rpc::<_, TasksListResult>("task.list".to_owned(), Some(&params))
                .await?;
            tasks.extend(result.tasks);

            if result.continue_token.is_none() || result.continue_token == Some("".into()) {
                params.continue_token = None;
            } else {
                params.continue_token = result.continue_token;
            }

            if params.continue_token.is_none() {
                break;
            }
        }

        if let Some(name) = name {
            tasks.retain(|t| t.name().contains(name));
        }

        if let Some(workflow) = workflow {
            tasks.retain(|t| t.workflow().contains(workflow));
        }

        Ok(tasks)
    }

    /// Retrieve the task information and status.
    pub async fn task_info(&self, task_id: TaskID) -> Result<TaskInfo, Error> {
        self.rpc(
            "task.get".to_owned(),
            Some(HashMap::from([("id", task_id)])),
        )
        .await
    }

    /// Updates the tasks status.
    pub async fn task_status(&self, task_id: TaskID, status: &str) -> Result<Task, Error> {
        let status = TaskStatus {
            task_id,
            status: status.to_owned(),
        };
        self.rpc("docker.update.status".to_owned(), Some(status))
            .await
    }

    /// Defines the stages for the task.  The stages are defined as a mapping
    /// from stage names to their descriptions.  Once stages are defined their
    /// status can be updated using the update_stage method.
    pub async fn set_stages(&self, task_id: TaskID, stages: &[(&str, &str)]) -> Result<(), Error> {
        let stages: Vec<HashMap<String, String>> = stages
            .iter()
            .map(|(key, value)| {
                let mut stage_map = HashMap::new();
                stage_map.insert(key.to_string(), value.to_string());
                stage_map
            })
            .collect();
        let params = TaskStages { task_id, stages };
        let _: Task = self.rpc("status.stages".to_owned(), Some(params)).await?;
        Ok(())
    }

    /// Updates the progress of the task for the provided stage and status
    /// information.
    pub async fn update_stage(
        &self,
        task_id: TaskID,
        stage: &str,
        status: &str,
        message: &str,
        percentage: u8,
    ) -> Result<(), Error> {
        let stage = Stage::new(
            Some(task_id),
            stage.to_owned(),
            Some(status.to_owned()),
            Some(message.to_owned()),
            percentage,
        );
        let _: Task = self.rpc("status.update".to_owned(), Some(stage)).await?;
        Ok(())
    }

    /// Raw fetch from the Studio server is used for downloading files.
    pub async fn fetch(&self, query: &str) -> Result<Vec<u8>, Error> {
        let req = self
            .http
            .get(format!("{}/{}", self.url, query))
            .header("User-Agent", "EdgeFirst Client")
            .header("Authorization", format!("Bearer {}", self.token().await));
        let resp = req.send().await?;

        if resp.status().is_success() {
            let body = resp.bytes().await?;

            if log_enabled!(Level::Trace) {
                trace!("Fetch Response: {}", String::from_utf8_lossy(&body));
            }

            Ok(body.to_vec())
        } else {
            let err = resp.error_for_status_ref().unwrap_err();
            Err(Error::HttpError(err))
        }
    }

    /// Sends a multipart post request to the server.  This is used by the
    /// upload and download APIs which do not use JSON-RPC but instead transfer
    /// files using multipart/form-data.
    pub async fn post_multipart(&self, method: &str, form: Form) -> Result<String, Error> {
        let req = self
            .http
            .post(format!("{}/api?method={}", self.url, method))
            .header("Accept", "application/json")
            .header("User-Agent", "EdgeFirst Client")
            .header("Authorization", format!("Bearer {}", self.token().await))
            .multipart(form);
        let resp = req.send().await?;

        if resp.status().is_success() {
            let body = resp.bytes().await?;

            if log_enabled!(Level::Trace) {
                trace!(
                    "POST Multipart Response: {}",
                    String::from_utf8_lossy(&body)
                );
            }

            let response: RpcResponse<String> = match serde_json::from_slice(&body) {
                Ok(response) => response,
                Err(err) => {
                    error!("Invalid JSON Response: {}", String::from_utf8_lossy(&body));
                    return Err(err.into());
                }
            };

            if let Some(error) = response.error {
                Err(Error::RpcError(error.code, error.message))
            } else if let Some(result) = response.result {
                Ok(result)
            } else {
                Err(Error::InvalidResponse)
            }
        } else {
            let err = resp.error_for_status_ref().unwrap_err();
            Err(Error::HttpError(err))
        }
    }

    /// Send a JSON-RPC request to the server.  The method is the name of the
    /// method to call on the server.  The params are the parameters to pass to
    /// the method.  The method and params are serialized into a JSON-RPC
    /// request and sent to the server.  The response is deserialized into
    /// the specified type and returned to the caller.
    ///
    /// NOTE: This API would generally not be called directly and instead users
    /// should use the higher-level methods provided by the client.
    pub async fn rpc<Params, RpcResult>(
        &self,
        method: String,
        params: Option<Params>,
    ) -> Result<RpcResult, Error>
    where
        Params: Serialize,
        RpcResult: DeserializeOwned,
    {
        let auth_expires = self.token_expiration().await?;
        if auth_expires <= Utc::now() + Duration::from_secs(3600) {
            self.renew_token().await?;
        }

        self.rpc_without_auth(method, params).await
    }

    async fn rpc_without_auth<Params, RpcResult>(
        &self,
        method: String,
        params: Option<Params>,
    ) -> Result<RpcResult, Error>
    where
        Params: Serialize,
        RpcResult: DeserializeOwned,
    {
        let request = RpcRequest {
            method,
            params,
            ..Default::default()
        };

        if log_enabled!(Level::Trace) {
            trace!(
                "RPC Request: {}",
                serde_json::ser::to_string_pretty(&request)?
            );
        }

        for attempt in 0..MAX_RETRIES {
            let res = match self
                .http
                .post(format!("{}/api", self.url))
                .header("Accept", "application/json")
                .header("User-Agent", "EdgeFirst Client")
                .header("Authorization", format!("Bearer {}", self.token().await))
                .json(&request)
                .send()
                .await
            {
                Ok(res) => res,
                Err(err) => {
                    warn!("Socket Error: {:?}", err);
                    continue;
                }
            };

            if res.status().is_success() {
                let body = res.bytes().await?;

                if log_enabled!(Level::Trace) {
                    trace!("RPC Response: {}", String::from_utf8_lossy(&body));
                }

                let response: RpcResponse<RpcResult> = match serde_json::from_slice(&body) {
                    Ok(response) => response,
                    Err(err) => {
                        error!("Invalid JSON Response: {}", String::from_utf8_lossy(&body));
                        return Err(err.into());
                    }
                };

                // FIXME: Studio Server always returns 999 as the id.
                // if request.id.to_string() != response.id {
                //     return Err(Error::InvalidRpcId(response.id));
                // }

                if let Some(error) = response.error {
                    return Err(Error::RpcError(error.code, error.message));
                } else if let Some(result) = response.result {
                    return Ok(result);
                } else {
                    return Err(Error::InvalidResponse);
                }
            } else {
                let err = res.error_for_status_ref().unwrap_err();
                warn!("HTTP Error {}: {}", err, res.text().await?);
            }

            warn!(
                "Retrying RPC request (attempt {}/{})...",
                attempt + 1,
                MAX_RETRIES
            );
            tokio::time::sleep(Duration::from_secs(1) * attempt).await;
        }

        Err(Error::MaxRetriesExceeded(MAX_RETRIES))
    }
}

async fn upload_multipart(
    http: reqwest::Client,
    part: SnapshotPart,
    path: PathBuf,
    total: usize,
    current: Arc<AtomicUsize>,
    progress: Option<Sender<Progress>>,
) -> Result<SnapshotCompleteMultipartParams, Error> {
    let filesize = path.metadata()?.len() as usize;
    let n_parts = filesize.div_ceil(PART_SIZE);
    let sem = Arc::new(Semaphore::new(MAX_TASKS));

    let key = part.key.unwrap();
    let upload_id = part.upload_id;

    let urls = part.urls.clone();
    let etags = Arc::new(tokio::sync::Mutex::new(vec![
        EtagPart {
            etag: "".to_owned(),
            part_number: 0,
        };
        n_parts
    ]));

    let tasks = (0..n_parts)
        .map(|part| {
            let http = http.clone();
            let url = urls[part].clone();
            let etags = etags.clone();
            let path = path.to_owned();
            let sem = sem.clone();
            let progress = progress.clone();
            let current = current.clone();

            tokio::spawn(async move {
                let _permit = sem.acquire().await?;
                let mut etag = None;

                for attempt in 0..MAX_RETRIES {
                    match upload_part(http.clone(), url.clone(), path.clone(), part, n_parts).await
                    {
                        Ok(v) => {
                            etag = Some(v);
                            break;
                        }
                        Err(err) => {
                            warn!("Upload Part Error: {:?}", err);
                            tokio::time::sleep(Duration::from_secs(1) * attempt).await;
                        }
                    }
                }

                if let Some(etag) = etag {
                    let mut etags = etags.lock().await;
                    etags[part] = EtagPart {
                        etag,
                        part_number: part + 1,
                    };

                    let current = current.fetch_add(PART_SIZE, Ordering::SeqCst);
                    if let Some(progress) = &progress {
                        progress
                            .send(Progress {
                                current: current + PART_SIZE,
                                total,
                            })
                            .await
                            .unwrap();
                    }

                    Ok(())
                } else {
                    Err(Error::MaxRetriesExceeded(MAX_RETRIES))
                }
            })
        })
        .collect::<Vec<_>>();

    join_all(tasks)
        .await
        .into_iter()
        .collect::<Result<Vec<_>, _>>()?;

    Ok(SnapshotCompleteMultipartParams {
        key,
        upload_id,
        etag_list: etags.lock().await.clone(),
    })
}

async fn upload_part(
    http: reqwest::Client,
    url: String,
    path: PathBuf,
    part: usize,
    n_parts: usize,
) -> Result<String, Error> {
    let filesize = path.metadata()?.len() as usize;
    let mut file = File::open(path).await.unwrap();
    file.seek(SeekFrom::Start((part * PART_SIZE) as u64))
        .await
        .unwrap();
    let file = file.take(PART_SIZE as u64);

    let body_length = if part + 1 == n_parts {
        filesize % PART_SIZE
    } else {
        PART_SIZE
    };

    let stream = FramedRead::new(file, BytesCodec::new());
    let body = Body::wrap_stream(stream);

    let resp = http
        .put(url.clone())
        .header(CONTENT_LENGTH, body_length)
        .body(body)
        .send()
        .await?
        .error_for_status()?;
    let etag = resp
        .headers()
        .get("etag")
        .unwrap()
        .to_str()
        .unwrap()
        .to_owned();
    // Studio Server requires etag without the quotes.
    Ok(etag
        .strip_prefix("\"")
        .unwrap()
        .strip_suffix("\"")
        .unwrap()
        .to_owned())
}