liboxen 0.51.1

Oxen is a fast, unstructured data version control, to help version large machine learning datasets written in Rust.
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//! Helper functions to get metadata from the local filesystem.
//!

use crate::error::OxenError;
use crate::model::entry::entry_data_type::EntryDataType;
use crate::model::entry::metadata_entry::CLIMetadataEntry;
use crate::model::merkle_tree::node::{DirNode, FileNode};
use crate::model::metadata::MetadataDir;
use crate::model::metadata::generic_metadata::GenericMetadata;
use crate::model::parsed_resource::ParsedResourceView;
use crate::model::{Commit, LocalRepository, MetadataEntry};
use crate::repositories;
use crate::util;

use std::path::{Path, PathBuf};

pub mod audio;
pub mod image;
pub mod tabular;
pub mod text;
pub mod video;

/// Returns the metadata given a file path
pub fn get(path: impl AsRef<Path>) -> Result<MetadataEntry, OxenError> {
    let path = path.as_ref();
    let base_name = path
        .file_name()
        .ok_or_else(|| OxenError::file_has_no_name(path))?;
    let size = get_file_size(path)?;
    let mime_type = util::fs::file_mime_type(path);
    let data_type = util::fs::datatype_from_mimetype(path, mime_type.as_str());
    let extension = util::fs::file_extension(path);
    let metadata = get_file_metadata(path, &data_type)?;

    Ok(MetadataEntry {
        filename: base_name.to_string_lossy().to_string(),
        hash: "".to_string(),
        is_dir: path.is_dir(),
        latest_commit: None,
        resource: None,
        size,
        data_type,
        mime_type,
        extension,
        metadata,
        is_queryable: None,
        children: None,
    })
}

pub fn from_file_node(
    _repo: &LocalRepository,
    node: &FileNode,
    commit: &Commit,
) -> Result<MetadataEntry, OxenError> {
    Ok(MetadataEntry {
        filename: node.name().to_string(),
        hash: node.hash().to_string(),
        is_dir: false,
        latest_commit: Some(commit.to_owned()),
        resource: Some(ParsedResourceView {
            commit: Some(commit.to_owned()),
            branch: None,
            workspace: None,
            path: PathBuf::from(node.name()),
            version: PathBuf::from(commit.id.to_string()),
            resource: PathBuf::from(commit.id.to_string()).join(node.name()),
        }),
        size: node.num_bytes(),
        data_type: node.data_type().clone(),
        mime_type: node.mime_type().to_string(),
        extension: node.extension().to_string(),
        metadata: node.metadata(),
        is_queryable: None,
        children: None,
    })
}

pub fn from_dir_node(
    _repo: &LocalRepository,
    node: &DirNode,
    commit: &Commit,
) -> Result<MetadataEntry, OxenError> {
    Ok(MetadataEntry {
        filename: node.name().to_string(),
        hash: node.hash().to_string(),
        is_dir: true,
        latest_commit: Some(commit.to_owned()),
        resource: None,
        size: node.num_bytes(),
        data_type: EntryDataType::Dir,
        mime_type: "inode/directory".to_string(),
        extension: "".to_string(),
        metadata: None,
        is_queryable: None,
        children: None,
    })
}

/// Returns metadata with latest commit information. Less efficient than get().
pub use crate::core::v_latest::metadata::get_cli;

/// Returns CLI metadata for `path` as it existed at `revision`, sourced from the merkle tree
/// rather than the working-tree file. `revision` may be a branch name, a commit id, or `HEAD`.
/// Errors if `revision` does not resolve to a commit, or if `path` is not a file in that commit.
pub fn get_cli_at_revision(
    repo: &LocalRepository,
    path: impl AsRef<Path>,
    revision: &str,
) -> Result<CLIMetadataEntry, OxenError> {
    let path = path.as_ref();
    let commit = repositories::revisions::get(repo, revision)?
        .ok_or_else(|| OxenError::RevisionNotFound(revision.into()))?;
    let file_node = repositories::tree::get_file_by_path(repo, &commit, path)?
        .ok_or_else(|| OxenError::entry_does_not_exist_in_commit(path, &commit.id))?;
    let last_commit_id = file_node.last_commit_id().to_string();
    let last_updated = repositories::commits::get_by_id(repo, &last_commit_id)?;
    Ok(CLIMetadataEntry {
        filename: file_node.name().to_string(),
        last_updated,
        hash: file_node.hash().to_string(),
        size: file_node.num_bytes(),
        data_type: file_node.data_type().clone(),
        mime_type: file_node.mime_type().to_string(),
        extension: file_node.extension().to_string(),
    })
}

/// Returns the file size in bytes.
pub fn get_file_size(path: impl AsRef<Path>) -> Result<u64, OxenError> {
    let metadata = util::fs::metadata(path.as_ref())?;
    Ok(metadata.len())
}

pub fn get_file_metadata_with_extension(
    path: impl AsRef<Path>,
    data_type: &EntryDataType,
    extension: &str,
) -> Result<Option<GenericMetadata>, OxenError> {
    match data_type {
        // dir should not be passed in here
        EntryDataType::Dir => Ok(Some(GenericMetadata::MetadataDir(MetadataDir::new(vec![])))),
        EntryDataType::Text => match text::get_metadata(path) {
            Ok(metadata) => Ok(Some(GenericMetadata::MetadataText(metadata))),
            Err(err) => {
                log::warn!("could not compute text metadata: {err}");
                Ok(None)
            }
        },
        EntryDataType::Image => match image::get_metadata(path) {
            Ok(metadata) => Ok(Some(GenericMetadata::MetadataImage(metadata))),
            Err(err) => {
                log::warn!("could not compute image metadata: {err}");
                Ok(None)
            }
        },
        EntryDataType::Video => match video::get_metadata(path) {
            Ok(metadata) => Ok(Some(GenericMetadata::MetadataVideo(metadata))),
            Err(err) => {
                log::warn!("could not compute video metadata: {err}");
                Ok(None)
            }
        },
        EntryDataType::Audio => match audio::get_metadata(path) {
            Ok(metadata) => Ok(Some(GenericMetadata::MetadataAudio(metadata))),
            Err(err) => {
                log::warn!("could not compute audio metadata: {err}");
                Ok(None)
            }
        },
        EntryDataType::Tabular => match tabular::get_metadata_with_extension(path, extension) {
            Ok(metadata) => Ok(Some(GenericMetadata::MetadataTabular(metadata))),
            Err(err) => {
                log::warn!("could not compute tabular metadata: {err}");
                Ok(None)
            }
        },
        _ => Ok(None),
    }
}

/// Returns metadata based on data_type
pub fn get_file_metadata(
    path: impl AsRef<Path>,
    data_type: &EntryDataType,
) -> Result<Option<GenericMetadata>, OxenError> {
    let path = path.as_ref();
    get_file_metadata_with_extension(path, data_type, &util::fs::file_extension(path))
}

#[cfg(test)]
mod tests {
    use crate::error::OxenError;
    use crate::model::EntryDataType;
    use crate::repositories;
    use crate::test;
    use crate::util;
    use std::path::Path;

    #[tokio::test]
    async fn test_get_metadata_audio_flac() {
        let file = test::test_audio_file_with_name("121-121726-0005.flac");
        let metadata = repositories::metadata::get(file).unwrap();

        println!("metadata: {metadata:?}");

        assert_eq!(metadata.size, 37096);
        assert_eq!(metadata.data_type, EntryDataType::Audio);
        assert_eq!(metadata.mime_type, "audio/x-flac");
    }

    #[tokio::test]
    async fn test_get_cli_at_revision_reads_committed_metadata_not_worktree()
    -> Result<(), OxenError> {
        test::run_empty_local_repo_test_async(|repo| async move {
            let relative_path = Path::new("hello.txt");
            let full_path = repo.path.join(relative_path);

            util::fs::write_to_path(&full_path, "head version")?;
            repositories::add(&repo, &full_path).await?;
            repositories::commit(&repo, "add hello")?;

            let committed =
                repositories::metadata::get_cli_at_revision(&repo, relative_path, "HEAD")?;

            // Change the working tree to prove the metadata comes from the commit, not disk.
            util::fs::write_to_path(&full_path, "a longer working-tree version with new bytes")?;

            let at_head =
                repositories::metadata::get_cli_at_revision(&repo, relative_path, "HEAD")?;
            assert_eq!(at_head.hash, committed.hash);
            assert_eq!(at_head.size, "head version".len() as u64);

            Ok(())
        })
        .await
    }
}