fix: enhance error handling in extractor and loader processes; ensure proper job error propagation and logging

internal/app/custom_errors/extractor.error.go

@@ -43,6 +43,7 @@ func ExtractorErrorHandler(
 			}
 
 			if err.Partition.RetryCounter >= maxRetryAttempts {
+				wgActivePartitions.Done()
 				jobError := JobError{
 					ShouldCancelJob: false,
 					Msg:             fmt.Sprintf("Partition %v reached max retries (%d)", err.Partition.Id, maxRetryAttempts),
@@ -55,8 +56,19 @@ func ExtractorErrorHandler(
 					return
 				}
 
-				wgActivePartitions.Done()
 				continue
+			} else {
+				jobError := JobError{
+					ShouldCancelJob: false,
+					Msg:             fmt.Sprintf("Temporal error in partition %v (retries: %d)", err.Partition.Id, err.Partition.RetryCounter),
+					Prev:            &err,
+				}
+
+				select {
+				case chJobErrorsOut <- jobError:
+				case <-ctx.Done():
+					return
+				}
 			}
 
 			newPartition := err.Partition

internal/app/custom_errors/job.error.go

@@ -37,11 +37,11 @@ func JobErrorHandler(ctx context.Context, chErrorsIn <-chan JobError) error {
 			}
 
 			if err.ShouldCancelJob {
-				log.Error(err.Msg, " - ", err.Prev)
+				log.Errorf("(Fatal job error) - %v - %v", err.Msg, err.Prev)
 				return &err
 			}
 
-			log.Error(err.Msg, " - ", err.Prev)
+			log.Errorf("%v - %v", err.Msg, err.Prev)
 		}
 	}
 }

internal/app/custom_errors/loader.error.go

@@ -40,6 +40,7 @@ func LoaderErrorHandler(
 			}
 
 			if err.RetryCounter >= maxRetryAttempts {
+				wgActiveBatches.Done()
 				jobError := JobError{
 					ShouldCancelJob: false,
 					Msg:             fmt.Sprintf("Batch %v reached max retries (%d)", err.Id, maxRetryAttempts),
@@ -52,8 +53,19 @@ func LoaderErrorHandler(
 					return
 				}
 
-				wgActiveBatches.Done()
 				continue
+			} else {
+				jobError := JobError{
+					ShouldCancelJob: false,
+					Msg:             fmt.Sprintf("Temporal error in batch %v (retries: %d)", err.Batch.Id, err.Batch.RetryCounter),
+					Prev:            &err,
+				}
+
+				select {
+				case chJobErrorsOut <- jobError:
+				case <-ctx.Done():
+					return
+				}
 			}
 
 			err.RetryCounter++

internal/app/etl/extractors/mssql.go

@@ -247,24 +247,28 @@ func (mssqlEx *MssqlExtractor) Exec(
 
 			if err != nil {
 				var exError *custom_errors.ExtractorError
+				var jobError *custom_errors.JobError
 				if errors.As(err, &exError) {
 					select {
 					case <-ctx.Done():
 						return
 					case chErrorsOut <- *exError:
 					}
-				}
-
-				var jobError *custom_errors.JobError
-				if errors.As(err, &jobError) {
+				} else if errors.As(err, &jobError) {
 					select {
 					case <-ctx.Done():
 						return
 					case chJobErrorsOut <- *jobError:
 					}
+				} else {
+					select {
+					case <-ctx.Done():
+						return
+					case chErrorsOut <- custom_errors.ExtractorError{Partition: partition, Msg: err.Error()}:
+					}
 				}
 
-				return
+				continue
 			}
 
 			wgActivePartitions.Done()

internal/app/etl/loaders/postgres.go

@@ -97,24 +97,28 @@ func (postgresLd *PostgresLoader) Exec(
 
 			if err != nil {
 				var ldError *custom_errors.LoaderError
+				var jobError *custom_errors.JobError
 				if errors.As(err, &ldError) {
 					select {
 					case <-ctx.Done():
 						return
 					case chErrorsOut <- *ldError:
 					}
-				}
-
-				var jobError *custom_errors.JobError
-				if errors.As(err, &jobError) {
+				} else if errors.As(err, &jobError) {
 					select {
 					case <-ctx.Done():
 						return
 					case chJobErrorsOut <- *jobError:
 					}
+				} else {
+					select {
+					case <-ctx.Done():
+						return
+					case chErrorsOut <- custom_errors.LoaderError{Batch: batch, Msg: err.Error()}:
+					}
 				}
 
-				return
+				continue
 			}
 
 			wgActiveBatches.Done()