feat: add context support to migration job processing for improved cancellation and error handling

cmd/go_migrate/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"time"
 
 	log "github.com/sirupsen/logrus"
@@ -37,6 +38,10 @@ const (
 func main() {
 	configureLog()
 	startTime := time.Now()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
 	log.Info("=== Starting migration ===")
 	log.Infof("Number of loaders: %d, Chunk size: %d", NumLoaders, ChunkSize)
 
@@ -50,7 +55,7 @@ func main() {
 
 	for _, job := range migrationJobs {
 		log.Infof(">>> Processing job: %s.%s <<<", job.Schema, job.Table)
-		processMigrationJob(sourceDb, targetDb, job)
+		processMigrationJob(ctx, sourceDb, targetDb, job)
 	}
 
 	totalDuration := time.Since(startTime)

cmd/go_migrate/process.go

@@ -12,7 +12,12 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
-func processMigrationJob(sourceDb *sql.DB, targetDb *pgxpool.Pool, job MigrationJob) {
+func processMigrationJob(
+	ctx context.Context,
+	sourceDb *sql.DB,
+	targetDb *pgxpool.Pool,
+	job MigrationJob,
+) {
 	jobStartTime := time.Now()
 	log.Infof("Starting migration job: %s.%s [PK: %s]", job.Schema, job.Table, job.PrimaryKey)
 
@@ -24,10 +29,10 @@ func processMigrationJob(sourceDb *sql.DB, targetDb *pgxpool.Pool, job Migration
 	logColumnTypes(sourceColTypes, "Source col types")
 	logColumnTypes(targetColTypes, "Target col types")
 
-	ctx, cancel := context.WithCancel(context.Background())
+	jobCtx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
-	batches, err := batchGeneratorMssql(ctx, sourceDb, job)
+	batches, err := batchGeneratorMssql(jobCtx, sourceDb, job)
 	if err != nil {
 		log.Error("Unexpected error calculating batch ranges: ", err)
 	}
@@ -46,13 +51,13 @@ func processMigrationJob(sourceDb *sql.DB, targetDb *pgxpool.Pool, job Migration
 	var wgLoaders sync.WaitGroup
 
 	go func() {
-		if err := jobErrorHandler(ctx, chJobErrors); err != nil {
+		if err := jobErrorHandler(jobCtx, chJobErrors); err != nil {
 			cancel()
 		}
 	}()
 
-	go extractorErrorHandler(ctx, chExtractorErrors, chBatches, chJobErrors, &wgActiveBatches)
-	go loaderErrorHandler(ctx, chLoadersErrors, chChunksTransformed, chJobErrors, &wgActiveChunks)
+	go extractorErrorHandler(jobCtx, chExtractorErrors, chBatches, chJobErrors, &wgActiveBatches)
+	go loaderErrorHandler(jobCtx, chLoadersErrors, chChunksTransformed, chJobErrors, &wgActiveChunks)
 
 	maxExtractors := min(NumExtractors, len(batches))
 	log.Infof("Starting %d extractors...", maxExtractors)
@@ -60,7 +65,7 @@ func processMigrationJob(sourceDb *sql.DB, targetDb *pgxpool.Pool, job Migration
 
 	for range maxExtractors {
 		wgExtractors.Go(func() {
-			extractFromMssql(ctx, sourceDb, job, sourceColTypes, ChunkSize, chBatches, chChunksRaw, chExtractorErrors, chJobErrors, &wgActiveBatches)
+			extractFromMssql(jobCtx, sourceDb, job, sourceColTypes, ChunkSize, chBatches, chChunksRaw, chExtractorErrors, chJobErrors, &wgActiveBatches)
 		})
 	}
 
@@ -76,7 +81,7 @@ func processMigrationJob(sourceDb *sql.DB, targetDb *pgxpool.Pool, job Migration
 
 	for range maxExtractors {
 		wgTransformers.Go(func() {
-			transformRowsMssql(ctx, sourceColTypes, chChunksRaw, chChunksTransformed, chJobErrors, &wgActiveChunks)
+			transformRowsMssql(jobCtx, sourceColTypes, chChunksRaw, chChunksTransformed, chJobErrors, &wgActiveChunks)
 		})
 	}
 
@@ -85,7 +90,7 @@ func processMigrationJob(sourceDb *sql.DB, targetDb *pgxpool.Pool, job Migration
 
 	for range NumLoaders {
 		wgLoaders.Go(func() {
-			loadRowsPostgres(ctx, targetDb, job, targetColTypes, chChunksTransformed, chLoadersErrors, chJobErrors, &wgActiveChunks)
+			loadRowsPostgres(jobCtx, targetDb, job, targetColTypes, chChunksTransformed, chLoadersErrors, chJobErrors, &wgActiveChunks)
 		})
 	}
 
@@ -111,7 +116,7 @@ func processMigrationJob(sourceDb *sql.DB, targetDb *pgxpool.Pool, job Migration
 		cancel()
 	}()
 
-	<-ctx.Done()
+	<-jobCtx.Done()
 	log.Infof("Migration job completed. Total time: %v", time.Since(jobStartTime))
 }