AydarZaynutdinov commented on a change in pull request #16121:
URL: https://github.com/apache/beam/pull/16121#discussion_r761996512



##########
File path: playground/backend/internal/code_processing/code_processing.go
##########
@@ -91,42 +115,89 @@ func Process(ctx context.Context, cacheService 
cache.Cache, lc *fs_tool.LifeCycl
                var compileOutput bytes.Buffer
                runCmdWithOutput(compileCmd, &compileOutput, &compileError, 
successChannel, errorChannel)
 
-               if err = processStep(ctxWithTimeout, pipelineId, cacheService, 
cancelChannel, successChannel, &compileOutput, &compileError, errorChannel, 
pb.Status_STATUS_COMPILE_ERROR, pb.Status_STATUS_EXECUTING); err != nil {
+               ok, err = processStep(ctxWithTimeout, pipelineId, cacheService, 
cancelChannel, successChannel)
+               if err != nil {
+                       return
+               }
+               if !ok {
+                       _ = processCompileError(ctxWithTimeout, errorChannel, 
compileError.Bytes(), pipelineId, cacheService)
+                       return
+               }
+               if err := processCompileSuccess(ctxWithTimeout, 
compileOutput.Bytes(), pipelineId, cacheService); err != nil {
                        return
                }
        case pb.Sdk_SDK_PYTHON:
-               processSuccess(ctx, []byte(""), pipelineId, cacheService, 
pb.Status_STATUS_EXECUTING)
+               if err := processCompileSuccess(ctxWithTimeout, []byte(""), 
pipelineId, cacheService); err != nil {
+                       return
+               }
        }
 
        // Run
        if sdkEnv.ApacheBeamSdk == pb.Sdk_SDK_JAVA {
-               executor = setJavaExecutableFile(lc, pipelineId, cacheService, 
ctxWithTimeout, executorBuilder, appEnv.WorkingDir())
+               executor, err = setJavaExecutableFile(lc, pipelineId, 
cacheService, ctxWithTimeout, executorBuilder, appEnv.WorkingDir())
+               if err != nil {
+                       return
+               }
        }
        logger.Infof("%s: Run() ...\n", pipelineId)
        runCmd := executor.Run(ctxWithTimeout)
        var runError bytes.Buffer
        runOutput := streaming.RunOutputWriter{Ctx: ctxWithTimeout, 
CacheService: cacheService, PipelineId: pipelineId}
-       runCmdWithOutput(runCmd, &runOutput, &runError, successChannel, 
errorChannel)
+       go readLogFile(ctxWithTimeout, cacheService, 
lc.GetAbsoluteLogFilePath(), pipelineId, stopReadLogsChannel, 
finishReadLogsChannel)
 
-       err = processStep(ctxWithTimeout, pipelineId, cacheService, 
cancelChannel, successChannel, nil, &runError, errorChannel, 
pb.Status_STATUS_RUN_ERROR, pb.Status_STATUS_FINISHED)
+       if sdkEnv.ApacheBeamSdk == pb.Sdk_SDK_GO {
+               // For go SDK all logs are placed to stdErr.
+               file, err := os.Create(lc.GetAbsoluteLogFilePath())
+               if err != nil {
+                       // If some error with creating a log file do the same 
as with other SDK.
+                       logger.Errorf("%s: error during create log file (go 
sdk): %s", pipelineId, err.Error())
+                       runCmdWithOutput(runCmd, &runOutput, &runError, 
successChannel, errorChannel)
+               } else {
+                       // Use the log file to write all stdErr into it.
+                       runCmdWithOutput(runCmd, &runOutput, file, 
successChannel, errorChannel)
+               }
+       } else {
+               // Other SDKs write logs to the log file on their own.
+               runCmdWithOutput(runCmd, &runOutput, &runError, successChannel, 
errorChannel)
+       }
+
+       ok, err = processStep(ctxWithTimeout, pipelineId, cacheService, 
cancelChannel, successChannel)
        if err != nil {
                return
        }
+       if !ok {
+               if sdkEnv.ApacheBeamSdk == pb.Sdk_SDK_GO {

Review comment:
       after the second `if` we have some logic that should be done without 
checking SDK:
   ```
   ...
   if !ok {
     if sdkEnv.ApacheBeamSdk == pb.Sdk_SDK_GO {
       // code for the Go SDK only
     }
     // code for all SDK (including Go SDK after the top part)
     return
   }
   ...
   ```
   
   If I join these 2 `if`s it will be something like:
   ```
   if !ok && sdkEnv.ApacheBeamSdk == pb.Sdk_SDK_GO {
     // code for the Go SDK only
     // code for all SDK (including Go SDK after the top part)
     return
   }
   if !ok {
     // code for all SDK (excluding Go SDK)
     return
   }
   ```
   
   So I think it's better to use present code.




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