Merge pull request #359 from sasjs/retry-state-error

fix(job-state-poll): Continue poll regardless of errors

src/SASViyaApiClient.ts

@@ -1078,6 +1078,7 @@ export class SASViyaApiClient {
   ) {
     let POLL_INTERVAL = 300
     let MAX_POLL_COUNT = 1000
+    let MAX_ERROR_COUNT = 5
 
     if (pollOptions) {
       POLL_INTERVAL = pollOptions.POLL_INTERVAL || POLL_INTERVAL
@@ -1086,6 +1087,7 @@ export class SASViyaApiClient {
 
     let postedJobState = ''
     let pollCount = 0
+    let errorCount = 0
     const headers: any = {
       'Content-Type': 'application/json',
       'If-None-Match': etag
@@ -1107,7 +1109,11 @@ export class SASViyaApiClient {
         this.debug
       )
       .catch((err) => {
-        throw prefixMessage(err, 'Error while getting job state. ')
+        console.error(
+          `Error fetching job state from ${this.serverUrl}${stateLink.href}. Starting poll, assuming job to be running.`,
+          err
+        )
+        return { result: 'unavailable' }
       })
 
     const currentState = state.trim()
@@ -1122,7 +1128,8 @@ export class SASViyaApiClient {
         if (
           postedJobState === 'running' ||
           postedJobState === '' ||
-          postedJobState === 'pending'
+          postedJobState === 'pending' ||
+          postedJobState === 'unavailable'
         ) {
           if (stateLink) {
             const { result: jobState } = await this.requestClient
@@ -1134,13 +1141,27 @@ export class SASViyaApiClient {
                 this.debug
               )
               .catch((err) => {
-                throw prefixMessage(
-                  err,
-                  'Error while getting job state after interval. '
+                errorCount++
+                if (
+                  pollCount >= MAX_POLL_COUNT ||
+                  errorCount >= MAX_ERROR_COUNT
+                ) {
+                  throw prefixMessage(
+                    err,
+                    'Error while getting job state after interval. '
+                  )
+                }
+                console.error(
+                  `Error fetching job state from ${this.serverUrl}${stateLink.href}. Resuming poll, assuming job to be running.`,
+                  err
                 )
+                return { result: 'unavailable' }
               })
 
             postedJobState = jobState.trim()
+            if (postedJobState != 'unavailable' && errorCount > 0) {
+              errorCount = 0
+            }
 
             if (this.debug && printedState !== postedJobState) {
               console.log('Polling job status...')