fix(session): provide more info if could not get session state

src/SessionManager.ts

@@ -1,4 +1,5 @@
-import { Session, Context, CsrfToken, SessionVariable } from './types'
+import { Session, Context, SessionVariable } from './types'
+import { NoSessionStateError } from './types/errors'
 import { asyncForEach, isUrl } from './utils'
 import { prefixMessage } from '@sasjs/utils/error'
 import { RequestClient } from './request/RequestClient'
@@ -173,13 +174,14 @@ export class SessionManager {
             this.printedSessionState.printed = true
           }
 
-          const state = await this.getSessionState(
-            `${this.serverUrl}${stateLink.href}?wait=30`,
-            etag!,
-            accessToken
-          ).catch((err) => {
-            throw prefixMessage(err, 'Error while getting session state.')
-          })
+          const { result: state, responseStatus: responseStatus } =
+            await this.getSessionState(
+              `${this.serverUrl}${stateLink.href}?wait=30`,
+              etag!,
+              accessToken
+            ).catch((err) => {
+              throw prefixMessage(err, 'Error while getting session state.')
+            })
 
           sessionState = state.trim()
 
@@ -198,7 +200,14 @@ export class SessionManager {
 
               resolve(this.waitForSession(session, etag, accessToken))
             } else {
-              reject('Could not get session state.')
+              reject(
+                new NoSessionStateError(
+                  responseStatus,
+                  this.serverUrl + stateLink.href,
+                  session.links.find((l: any) => l.rel === 'log')
+                    ?.href as string
+                )
+              )
             }
           }
 
@@ -217,7 +226,10 @@ export class SessionManager {
   ) {
     return await this.requestClient
       .get(url, accessToken, 'text/plain', { 'If-None-Match': etag })
-      .then((res) => res.result as string)
+      .then((res) => ({
+        result: res.result as string,
+        responseStatus: res.status
+      }))
       .catch((err) => {
         throw err
       })

src/request/RequestClient.ts

@@ -84,7 +84,7 @@ export class RequestClient implements HttpClient {
     contentType: string = 'application/json',
     overrideHeaders: { [key: string]: string | number } = {},
     debug: boolean = false
-  ): Promise<{ result: T; etag: string }> {
+  ): Promise<{ result: T; etag: string; status: number }> {
     const headers = {
       ...this.getHeaders(accessToken, contentType),
       ...overrideHeaders
@@ -438,9 +438,15 @@ export class RequestClient implements HttpClient {
       includeSAS9Log = true
     }
 
-    let responseToReturn: { result: T; etag: any; log?: string } = {
+    let responseToReturn: {
+      result: T
+      etag: any
+      log?: string
+      status: number
+    } = {
       result: parsedResponse as T,
-      etag
+      etag,
+      status: response.status
     }
 
     if (includeSAS9Log) {

src/request/Sas9RequestClient.ts

@@ -39,7 +39,7 @@ export class Sas9RequestClient extends RequestClient {
     contentType: string = 'application/json',
     overrideHeaders: { [key: string]: string | number } = {},
     debug: boolean = false
-  ): Promise<{ result: T; etag: string }> {
+  ): Promise<{ result: T; etag: string; status: number }> {
     const headers = {
       ...this.getHeaders(accessToken, contentType),
       ...overrideHeaders

src/types/errors/NoSessionStateError.ts

@@ -0,0 +1,15 @@
+export class NoSessionStateError extends Error {
+  constructor(
+    public serverResponseStatus: number,
+    public sessionStateUrl: string,
+    public logUrl: string
+  ) {
+    super(
+      `Could not get session state. Server responded with ${serverResponseStatus} whilst checking state: ${sessionStateUrl}`
+    )
+
+    this.name = 'NoSessionStatus'
+
+    Object.setPrototypeOf(this, NoSessionStateError.prototype)
+  }
+}

src/types/errors/index.ts

@@ -5,3 +5,4 @@ export * from './JobExecutionError'
 export * from './LoginRequiredError'
 export * from './NotFoundError'
 export * from './ErrorResponse'
+export * from './NoSessionStateError'