137 lines
3.5 KiB
Go
137 lines
3.5 KiB
Go
package main
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import (
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"context"
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"database/sql"
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"sync"
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"time"
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"github.com/jackc/pgx/v5/pgxpool"
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_ "github.com/microsoft/go-mssqldb"
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log "github.com/sirupsen/logrus"
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)
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func processMigrationJob(
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ctx context.Context,
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sourceDb *sql.DB,
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targetDb *pgxpool.Pool,
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job MigrationJob,
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) {
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jobStartTime := time.Now()
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log.Infof("Starting migration job: %s.%s [PK: %s]", job.Schema, job.Table, job.PrimaryKey)
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sourceColTypes, targetColTypes, err := GetColumnTypes(sourceDb, targetDb, job)
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if err != nil {
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log.Fatal("Unexpected error: ", err)
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}
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logColumnTypes(sourceColTypes, "Source col types")
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logColumnTypes(targetColTypes, "Target col types")
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jobCtx, cancel := context.WithCancel(ctx)
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defer cancel()
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batches, err := batchGeneratorMssql(jobCtx, sourceDb, job)
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if err != nil {
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log.Error("Unexpected error calculating batch ranges: ", err)
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}
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chJobErrors := make(chan JobError, 50)
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chBatches := make(chan Batch, QueueSize)
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chExtractorErrors := make(chan ExtractorError, QueueSize)
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chChunksRaw := make(chan Chunk, QueueSize)
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chChunksTransformed := make(chan Chunk, QueueSize)
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chLoadersErrors := make(chan LoaderError, QueueSize)
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var wgActiveBatches sync.WaitGroup
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var wgActiveChunks sync.WaitGroup
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var wgExtractors sync.WaitGroup
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var wgTransformers sync.WaitGroup
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var wgLoaders sync.WaitGroup
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go func() {
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if err := jobErrorHandler(jobCtx, chJobErrors); err != nil {
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cancel()
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}
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}()
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go extractorErrorHandler(jobCtx, chExtractorErrors, chBatches, chJobErrors, &wgActiveBatches)
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go loaderErrorHandler(jobCtx, chLoadersErrors, chChunksTransformed, chJobErrors, &wgActiveChunks)
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maxExtractors := min(NumExtractors, len(batches))
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log.Infof("Starting %d extractors...", maxExtractors)
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extractStartTime := time.Now()
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for range maxExtractors {
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wgExtractors.Go(func() {
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extractFromMssql(jobCtx, sourceDb, job, sourceColTypes, ChunkSize, chBatches, chChunksRaw, chExtractorErrors, chJobErrors, &wgActiveBatches)
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})
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}
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wgActiveBatches.Add(len(batches))
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go func() {
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for _, batch := range batches {
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chBatches <- batch
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}
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}()
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log.Infof("Starting %d transformers...", maxExtractors)
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transformStartTime := time.Now()
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for range maxExtractors {
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wgTransformers.Go(func() {
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transformRowsMssql(jobCtx, sourceColTypes, chChunksRaw, chChunksTransformed, chJobErrors, &wgActiveChunks)
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})
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}
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log.Infof("Starting %d PostgreSQL loader(s)...", NumLoaders)
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loadStartTime := time.Now()
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for range NumLoaders {
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wgLoaders.Go(func() {
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loadRowsPostgres(jobCtx, targetDb, job, targetColTypes, chChunksTransformed, chLoadersErrors, chJobErrors, &wgActiveChunks)
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})
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}
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go func() {
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wgActiveBatches.Wait()
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close(chBatches)
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close(chExtractorErrors)
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wgExtractors.Wait()
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log.Infof("Extraction completed in %v", time.Since(extractStartTime))
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close(chChunksRaw)
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wgTransformers.Wait()
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log.Infof("Transformation completed in %v", time.Since(transformStartTime))
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wgActiveChunks.Wait()
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close(chChunksTransformed)
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close(chLoadersErrors)
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wgLoaders.Wait()
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log.Infof("Loading completed in %v", time.Since(loadStartTime))
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cancel()
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}()
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<-jobCtx.Done()
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log.Infof("Migration job completed. Total time: %v", time.Since(jobStartTime))
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}
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func logColumnTypes(columnTypes []ColumnType, label string) {
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log.Debug(label)
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for _, col := range columnTypes {
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log.Debugf("%+v", col)
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}
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}
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func logSampleRow(job MigrationJob, columns []ColumnType, rowValues UnknownRowValues, tag string) {
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log.Infof("[%s.%s] Sample row: (%s)", job.Schema, job.Table, tag)
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for i, col := range columns {
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log.Infof("%s (%T): %v", col.Name(), rowValues[i], rowValues[i])
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}
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}
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