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use crate::http_api::routing::RouteHandler;
use crate::workflows::manager::{WorkflowManagerRequest, WorkflowManagerRequestOperation};
use crate::workflows::steps::StepStatus;
use crate::workflows::{WorkflowState, WorkflowStatus, WorkflowStepState};
use async_trait::async_trait;
use hyper::http::HeaderValue;
use hyper::{Body, Error, Request, Response, StatusCode};
use serde::Serialize;
use std::collections::HashMap;
use std::time::Duration;
use tokio::sync::mpsc::UnboundedSender;
use tokio::sync::oneshot::channel;
use tokio::time::timeout;
use tracing::error;
pub struct GetWorkflowDetailsHandler {
manager: UnboundedSender<WorkflowManagerRequest>,
}
#[derive(Serialize)]
pub struct WorkflowStateResponse {
status: String,
active_steps: Vec<WorkflowStepStateResponse>,
pending_steps: Vec<WorkflowStepStateResponse>,
}
#[derive(Serialize)]
pub struct WorkflowStepStateResponse {
step_id: String,
step_type: String,
parameters: HashMap<String, Option<String>>,
status: String,
}
impl GetWorkflowDetailsHandler {
pub fn new(manager: UnboundedSender<WorkflowManagerRequest>) -> Self {
GetWorkflowDetailsHandler { manager }
}
}
#[async_trait]
impl RouteHandler for GetWorkflowDetailsHandler {
async fn execute(
&self,
_request: &mut Request<Body>,
path_parameters: HashMap<String, String>,
request_id: String,
) -> Result<Response<Body>, Error> {
let workflow_name = match path_parameters.get("workflow") {
Some(value) => value.to_string(),
None => {
error!("Get workflow endpoint called without a 'workflow' path parameter");
let mut response = Response::default();
*response.status_mut() = StatusCode::INTERNAL_SERVER_ERROR;
return Ok(response);
}
};
let (sender, receiver) = channel();
let _ = self.manager.send(WorkflowManagerRequest {
request_id,
operation: WorkflowManagerRequestOperation::GetWorkflowDetails {
name: workflow_name,
response_channel: sender,
},
});
let details = match timeout(Duration::from_secs(1), receiver).await {
Ok(Ok(details)) => details,
Ok(Err(_)) => {
error!("Receiver was dropped prior to sending a response");
let mut response = Response::default();
*response.status_mut() = StatusCode::INTERNAL_SERVER_ERROR;
return Ok(response);
}
Err(_) => {
error!("Request timed out");
let mut response = Response::default();
*response.status_mut() = StatusCode::INTERNAL_SERVER_ERROR;
return Ok(response);
}
};
let response = if let Some(details) = details {
let details = WorkflowStateResponse::from(details);
let json = match serde_json::to_string_pretty(&details) {
Ok(json) => json,
Err(e) => {
error!("Could not serialize workflow details response: {:?}", e);
let mut response = Response::default();
*response.status_mut() = StatusCode::INTERNAL_SERVER_ERROR;
return Ok(response);
}
};
let mut response = Response::new(Body::from(json));
let headers = response.headers_mut();
headers.insert(
hyper::http::header::CONTENT_TYPE,
HeaderValue::from_static("application/json"),
);
response
} else {
let mut response = Response::new(Body::from("Workflow not found"));
*response.status_mut() = StatusCode::NOT_FOUND;
response
};
Ok(response)
}
}
impl From<WorkflowState> for WorkflowStateResponse {
fn from(workflow: WorkflowState) -> Self {
WorkflowStateResponse {
status: match workflow.status {
WorkflowStatus::Running => "Running".to_string(),
WorkflowStatus::Error {
failed_step_id,
message,
} => format!("Step id {} failed: {}", failed_step_id, message),
},
active_steps: workflow
.active_steps
.into_iter()
.map(WorkflowStepStateResponse::from)
.collect(),
pending_steps: workflow
.pending_steps
.into_iter()
.map(WorkflowStepStateResponse::from)
.collect(),
}
}
}
impl From<WorkflowStepState> for WorkflowStepStateResponse {
fn from(step_state: WorkflowStepState) -> Self {
WorkflowStepStateResponse {
step_id: step_state.definition.get_id().to_string(),
step_type: step_state.definition.step_type.0,
parameters: step_state.definition.parameters,
status: match step_state.status {
StepStatus::Created => "Created".to_string(),
StepStatus::Active => "Active".to_string(),
StepStatus::Error { message } => format!("Error: {}", message),
StepStatus::Shutdown => "Shut Down".to_string(),
},
}
}
}