feat(api): added session state endpoint

api/src/controllers/session.ts

@@ -1,6 +1,8 @@
 import express from 'express'
 import { Request, Security, Route, Tags, Example, Get } from 'tsoa'
 import { UserResponse } from './user'
+import { getSessionController } from './internal'
+import { SessionState } from '../types'
 
 interface SessionResponse extends UserResponse {
   needsToUpdatePassword: boolean
@@ -26,6 +28,15 @@ export class SessionController {
   ): Promise<SessionResponse> {
     return session(request)
   }
+
+  /**
+   * @summary Get session state (initialising, pending, running, completed, failed).
+   * @example completed
+   */
+  @Get('/:sessionId/state')
+  public async sessionState(sessionId: string): Promise<SessionState> {
+    return sessionState(sessionId)
+  }
 }
 
 const session = (req: express.Request) => ({
@@ -35,3 +46,23 @@ const session = (req: express.Request) => ({
   isAdmin: req.user!.isAdmin,
   needsToUpdatePassword: req.user!.needsToUpdatePassword
 })
+
+const sessionState = (sessionId: string): SessionState => {
+  for (let runTime of process.runTimes) {
+    // get session controller for each available runTime
+    const sessionController = getSessionController(runTime)
+
+    // get session by sessionId
+    const session = sessionController.getSessionById(sessionId)
+
+    // return session state if session was found
+    if (session) {
+      return session.state
+    }
+  }
+
+  throw {
+    code: 404,
+    message: `Session with ID '${sessionId}' was not found.`
+  }
+}