94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
package main
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import (
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"context"
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"database/sql"
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"fmt"
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"sync"
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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(sourceDb *sql.DB, targetDb *pgxpool.Pool, job MigrationJob) {
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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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chRowsExtract := make(chan []UnknownRowValues, QueueSize)
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mssqlContext := context.Background()
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var wgMssqlExtractors sync.WaitGroup
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wgMssqlExtractors.Go(func() {
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if err := extractFromMssql(mssqlContext, job, sourceColTypes, ChunkSize, sourceDb, chRowsExtract); err != nil {
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log.Error("Unexpected error extrating data from mssql: ", err)
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}
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})
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go func() {
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wgMssqlExtractors.Wait()
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close(chRowsExtract)
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}()
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var wgMssqlTransformers sync.WaitGroup
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wgMssqlTransformers.Go(func() {
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transformRows(job, sourceColTypes, "sqlserver", chRowsExtract)
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})
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wgMssqlTransformers.Wait()
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chRowsExtractPostgres := make(chan []UnknownRowValues, QueueSize)
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postgresContext := context.Background()
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var wgPostgresExtractors sync.WaitGroup
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wgPostgresExtractors.Go(func() {
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if err := extractFromPostgres(postgresContext, job, sourceColTypes, ChunkSize, targetDb, chRowsExtractPostgres); err != nil {
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log.Error("Unexpected error extrating data from postgres: ", err)
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}
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})
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go func() {
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wgPostgresExtractors.Wait()
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close(chRowsExtractPostgres)
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}()
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var wgPostgresTransformers sync.WaitGroup
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wgPostgresTransformers.Go(func() {
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transformRows(job, sourceColTypes, "postgres", chRowsExtractPostgres)
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})
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wgPostgresTransformers.Wait()
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}
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func logColumnTypes(columnTypes []ColumnType, label string) {
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log.Info(label)
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for _, col := range columnTypes {
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log.Infof("%+v", col)
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}
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}
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func transformRows(job MigrationJob, columns []ColumnType, driver string, in <-chan []UnknownRowValues) {
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for rows := range in {
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log.Debugf("Chunk received (%s), transforming...", driver)
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for i, rowValues := range rows {
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if i%100 == 0 {
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logSampleRow(job, columns, rowValues, fmt.Sprintf("row %d", i))
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}
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}
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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: %v", col.Name(), rowValues[i])
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}
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}
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