// getRunnableMigrations queries the shift api to get new/updated migrations.
func (runner *runner) getRunnableMigrations() []*migration.Migration {
newMigrations := []*migration.Migration{}
// Get all of the staged migrations
glog.Info("Getting staged migrations.")
stagedMigrations, err := runner.RestClient.Staged()
if err != nil {
glog.Errorf("Failed to get staged migrations (error: %s)", err.Error())
return newMigrations
}
if len(stagedMigrations) == 0 {
glog.Info("No new staged migrations.")
}
// For each staged migration, try to unstage it.
for i := range stagedMigrations {
newMigration, err := unstageRunnableMigration(runner, stagedMigrations[i])
if err != nil {
glog.Errorf(err.Error())
continue
}
if newMigration != nil {
newMigrations = append(newMigrations, newMigration)
}
}
return newMigrations
}
// createAndRetrieveFiles attempts to create a migration's state file,
// if it does not exist, and retrieve the latest version from the api
func (runner *runner) createAndRetrieveFiles(currentMigration *migration.Migration) error {
if _, err := os.Stat(currentMigration.FilesDir); err != nil {
if os.IsNotExist(err) {
err := os.Mkdir(currentMigration.FilesDir, 0777)
if err != nil {
glog.Errorf("mig_id=%d: error creating pt-osc log directory '%s' (error: %s)", currentMigration.Id, currentMigration.FilesDir, err)
return ErrFiles
}
} else {
glog.Errorf("mig_id=%d: error stat-ing pt-osc log directory '%s' (error: %s)", currentMigration.Id, currentMigration.FilesDir, err)
return ErrFiles
}
}
// try to retrieve a statefile from the api
urlParams := map[string]string{
"migration_id": strconv.Itoa(currentMigration.Id),
"file_type": STATE_FILE_TYPE,
}
stateFile, restErr := runner.RestClient.GetFile(urlParams)
if restErr == nil && stateFile["contents"] != nil && len(stateFile["contents"].(string)) > 0 {
err := currentMigration.WriteStateFile([]byte(stateFile["contents"].(string)))
if err != nil {
glog.Errorf("mig_id=%d: error writing to statefile '%s' (error: %s)", currentMigration.Id, currentMigration.StateFile, err)
return ErrFiles
}
}
return nil
}
// writeToPtOscLog takes log lines it receives from a channel and passes them
// to a function that will write them
// Also writes to a buffer which is POSTed to append_to_file when a new log line appears
// after LogSyncInterval seconds
func (runner *runner) writeToPtOscLog(ptOscLogWriter *bufio.Writer, ptOscLogChan chan string, writerFunc writeToWriter, migrationId int, waitGroup *sync.WaitGroup) {
defer fileSyncWaitGroup.Done()
defer waitGroup.Done()
var buffer bytes.Buffer
lastPostTime := time.Unix(0, 0)
for line := range ptOscLogChan {
currentTime := time.Now().Local()
formattedLine := "[" + currentTime.Format("2006-01-02 15:04:05") + "] " + line
err := writerFunc(ptOscLogWriter, formattedLine, currentTime)
if err != nil {
glog.Errorf("Error flushing pt-osc log file (error: %s)", err)
}
_, err = buffer.WriteString(formattedLine + "\n")
if err != nil {
glog.Errorf("Error writing to log buffer (error: %s)", err)
}
if int(currentTime.Sub(lastPostTime)/time.Second) >= runner.LogSyncInterval && buffer.Len() > 0 {
err = runner.postLogToFileApi(&buffer, migrationId)
if err == nil {
lastPostTime = currentTime
}
}
}
glog.Infof("Stopped syncing log file")
runner.postLogToFileApi(&buffer, migrationId)
}
// failMigration reports a failed migration to the shift database/ui.
func (runner *runner) failMigration(migration *migration.Migration, errorMsg string) {
glog.Errorf("mig_id=%d: %s.", migration.Id, errorMsg)
urlParams := map[string]string{
"id": strconv.Itoa(migration.Id),
"error_message": errorMsg,
}
_, err := runner.RestClient.Fail(urlParams)
if err != nil {
glog.Errorf("mig_id=%d: %s.", migration.Id, err)
return
}
glog.Infof("mig_id=%d: Successfully failed migration.", migration.Id)
return
}
// WatchMigrationCopyStderr scans stderr of a migration on the copy step,
// and parses each line to get the % copied. It also checks for unexpected
// output, and it logs each line to a file
func (migration *Migration) WatchMigrationCopyStderr(stderrPipe io.Reader, copyPercentChan chan int, errChan chan error, ptOscLogChan chan string) {
scanner := bufio.NewScanner(stderrPipe)
var line string
var wasError bool
for scanner.Scan() {
line = scanner.Text()
wasError = true
ptOscLogChan <- fmt.Sprintf("stderr: %s", line)
copyPercentageMatch := copyPercentageRegex.MatchString(line)
if copyPercentageMatch {
if len(strings.Fields(line)) < 3 {
glog.Errorf("mig_id=%d: couldn't get copy percentage from '%s'. Continuing anyway", migration.Id, line)
}
copyPercentageS := strings.TrimSuffix(strings.Fields(line)[2], "%")
copyPercentage, err := strconv.Atoi(copyPercentageS)
if err != nil {
glog.Errorf("mig_id=%d: couldn't get int percentage from '%s'. Continuing anyway", migration.Id, line)
}
glog.Infof("mig_id=%d: updating migration with copy percentage of %d", migration.Id, copyPercentage)
copyPercentChan <- copyPercentage
}
}
if err := scanner.Err(); err != nil {
glog.Errorf("mig_id=%d: error getting stderr of pt-osc (error: %s)", migration.Id, err)
errChan <- ErrPtOscStderr
return
}
// 0 lines of stderr is okay, because that just means the migration went super quick. if there
// are lines of stderr, though, and the last line isn't one that we expect, there was a problem
if wasError {
copyPercentageMatch := copyPercentageRegex.MatchString(line)
waitingMatch := waitingRegex.MatchString(line)
pausingMatch := pausingRegex.MatchString(line)
if !copyPercentageMatch && !waitingMatch && !pausingMatch {
glog.Errorf("mig_id=%d: last line of stderror was not what we expect (was: %s). Something went wrong", migration.Id, line)
errChan <- ErrPtOscUnexpectedStderr
return
}
}
errChan <- nil
}
// killPtOscProcess sends a SIGKILL to the pt-osc process associated
// with the migrationId, does not lock runningMigMutex
func killPtOscProcessById(migrationId int) error {
pid := runningMigrations[migrationId]
glog.Infof("mig_id=%d: killing (pid = %d).", migrationId, pid)
err := syscall.Kill(pid, ptOscKillSignal)
if err != nil {
glog.Errorf("mig_id=%d: error killing pt-osc (error: %s)", migrationId, err)
return ErrPtOscKill
}
delete(runningMigrations, migrationId)
return nil
}
// RunWriteQuery executes a write query on the database for a migration
func (migration *Migration) RunWriteQuery(query string, args ...interface{}) error {
if args == nil {
glog.Infof("mig_id=%d: Running query '%s'.", migration.Id, query)
} else {
glog.Infof("mig_id=%d: Running query '%s' (args: %v).", migration.Id, query, args)
}
err := migration.DbClient.QueryInsertUpdate(query, args...)
if err != nil {
glog.Errorf("mig_id=%d: Query '%s' failed (error: %s).", migration.Id, query, err)
return ErrQueryFailed
}
return nil
}
// WatchMigrationStdout scans stdout of a migration, line by line, and
// logs it to a file.
func (migration *Migration) WatchMigrationStdout(stdoutPipe io.Reader, errChan chan error, ptOscLogChan chan string) {
scanner := bufio.NewScanner(stdoutPipe)
for scanner.Scan() {
line := scanner.Text()
ptOscLogChan <- fmt.Sprintf("stdout: %s", line)
}
if err := scanner.Err(); err != nil {
glog.Errorf("mig_id=%d: error getting stdout of pt-osc (error: %s)", migration.Id, err)
errChan <- ErrPtOscStdout
return
}
errChan <- nil
}
// RunReadQuery executes a read query on the database for a migration
func (migration *Migration) RunReadQuery(query string, args ...interface{}) (map[string][]string, error) {
if args == nil {
glog.Infof("mig_id=%d: Running query '%s'.", migration.Id, query)
} else {
glog.Infof("mig_id=%d: Running query '%s' (args: %v).", migration.Id, query, args)
}
response, err := migration.DbClient.QueryReturnColumnDict(query, args...)
if err != nil {
glog.Errorf("mig_id=%d: Query '%s' failed (error: %s).", migration.Id, query, err)
return nil, ErrQueryFailed
}
glog.Infof("mig_id=%d: Query response was '%v'", migration.Id, response)
return response, nil
}
// WatchMigrationStderr scans stderr of a migration, line by line, and
// checks for any unexpected output. It also logs each line to a file
func (migration *Migration) WatchMigrationStderr(stderrPipe io.Reader, errChan chan error, ptOscLogChan chan string) {
scanner := bufio.NewScanner(stderrPipe)
var wasError bool
for scanner.Scan() {
line := scanner.Text()
wasError = true
ptOscLogChan <- fmt.Sprintf("stderr: %s", line)
}
if err := scanner.Err(); err != nil {
glog.Errorf("mig_id=%d: error getting stderr of pt-osc (error: %s)", migration.Id, err)
errChan <- ErrPtOscStderr
return
}
// if there was anything sent to stderr, there was a problem
if wasError {
glog.Errorf("mig_id=%d: stderr is not empty. Something went wrong", migration.Id)
errChan <- ErrPtOscUnexpectedStderr
return
}
errChan <- nil
}
// updateMigrationCopyPercentage watches a channel for a running migration and
// sends the copy percentage completed (from the channel) to the shift api
func (runner *runner) updateMigrationCopyPercentage(currentMigration *migration.Migration, copyPercentChan chan int, waitGroup *sync.WaitGroup) {
defer fileSyncWaitGroup.Done()
defer waitGroup.Done()
migrationId := strconv.Itoa(currentMigration.Id)
for copyPercentage := range copyPercentChan {
// send the table stats to the api
urlParams := map[string]string{
"id": migrationId,
"copy_percentage": strconv.Itoa(copyPercentage),
}
_, err := runner.RestClient.Update(urlParams)
if err != nil {
glog.Errorf("mig_id=%d: error updating copy percentage (error: %s). Continuing anyway", migrationId, err)
}
}
}
// postLogToFileApi POSTs the lines in buffer to append_to_file as a log file then clears the buffer
func (runner *runner) postLogToFileApi(buffer *bytes.Buffer, migrationId int) error {
if buffer.Len() == 0 {
return nil
}
urlParams := make(map[string]string)
urlParams["migration_id"] = strconv.Itoa(migrationId)
urlParams["file_type"] = LOG_FILE_TYPE
urlParams["contents"] = buffer.String()
_, err := runner.RestClient.AppendToFile(urlParams)
if err != nil {
glog.Errorf("Error POSTing to append_to_file endpoint (error: %s)", err)
return err
}
buffer.Reset()
glog.Infof("Sent log lines to append_to_file endpoint")
return nil
}
// ValidateFinalInsert validates the syntax of the final insert statement,
// and starts/rolls back a trxn to verify that the insert won't fail.
func (migration *Migration) ValidateFinalInsert() error {
finalInsert := migration.FinalInsert
validInsertRegex := regexp.MustCompile("^(?i)(INSERT\\s+INTO\\s+)[^;]+$")
validInsertSyntax := validInsertRegex.MatchString(finalInsert)
if !validInsertSyntax {
return ErrInvalidInsert
}
glog.Infof("mig_id=%d: Validating final insert '%s' in a transaction and rolling it back.", migration.Id, finalInsert)
err := migration.DbClient.ValidateInsertStatement(finalInsert)
if err != nil {
glog.Errorf("mig_id=%d: Final insert '%s' failed (error: %s).", migration.Id, finalInsert, err)
return ErrInvalidInsert
}
glog.Infof("mig_id=%d: Final insert '%s' was successfully validated and rolled back.", migration.Id, finalInsert)
return nil
}
func (runner *runner) postStateFile(migration *migration.Migration) {
data, err := migration.ReadStateFile()
if err != nil {
glog.Warningf("Could not read state file (%s)", err)
} else {
urlParams := make(map[string]string)
urlParams["migration_id"] = strconv.Itoa(migration.Id)
urlParams["file_type"] = STATE_FILE_TYPE
urlParams["contents"] = string(data[:])
_, err = runner.RestClient.WriteFile(urlParams)
if err != nil {
glog.Errorf("Error POSTing to write_file endpoint (error: %s)", err)
} else {
glog.Infof("Sent state file to write_file endpoint")
}
}
}
func Start(configFile string) error {
migrationRunner, err := newRunner(configFile)
if err != nil {
glog.Errorf("Error creating migration runner (error: %s).", err)
return err
}
jobChannel := make(chan *migration.Migration)
go migrationRunner.watchForStopFile()
go migrationRunner.sendRunnableMigrationsToProcessor(jobChannel)
for job := range jobChannel {
go migrationRunner.processMigration(job)
}
return nil
}
// dbClient creates a mysql client that connects to a database host.
func (migration *Migration) SetupDbClient(user, password, cert, key, rootCA string, port int) error {
tlsConfig := &dbclient.TlsConfig{}
if (cert != "") && (key != "") && (rootCA != "") {
tlsConfig.UseTls = true
tlsConfig.RootCA = rootCA
tlsConfig.ClientCert = cert
tlsConfig.ClientKey = key
}
host := "tcp(" + migration.Host + ":" + strconv.Itoa(port) + ")"
db, err := newDbClient(user, password, host, migration.Database, "", tlsConfig)
if err != nil {
glog.Errorf("Failed to connect to the database (error: %s).", err)
return ErrDbConnect
} else {
migration.DbClient = db
}
glog.Infof("Successfully connected to the database (host = %s, user = %s, database = %s, root ca = %s, cert = %s, key = %s).",
host, user, migration.Database, rootCA, cert, key)
return nil
}
// DryRunCreatesNew does a dry run for creating a new table/view. First it verifies
// that the table/view doesn't already exist, and then it creates/drops it to verify
// that the ddl is valid.
func (migration *Migration) DryRunCreatesNew() error {
// verify the table/view doesn't already exist
query := "SELECT COUNT(*) as count FROM information_schema.tables WHERE table_schema=? AND table_name=?"
args := []interface{}{migration.Database, migration.Table}
response, err := RunReadQuery(migration, query, args...)
if err != nil {
return err
}
if response["count"][0] != "0" {
glog.Errorf("mig_id=%d: Table/view already exists.", migration.Id)
return ErrDryRunCreatesNew
}
// create and immediately drop the new table/view to verify the validity
// of the ddl
err = RunWriteQuery(migration, migration.DdlStatement)
if err != nil {
return err
}
return DirectDrop(migration)
}
// SwapOscTables swaps the original table and migration table for an OSC, and returns
// the name of the table that the original table got renamed to
func (migration *Migration) SwapOscTables() (string, error) {
var oldTable string
// get the name of the temporary migration table
migTable, err := GetMigTable(migration)
if err != nil {
return oldTable, err
}
// prep the "old" table name
oldTable = TimestampedTable(migration.Table)
// swap the tables
// current table -> old table, mig table -> current table
err = SwapTables(migration, migration.Table, oldTable, migTable, migration.Table)
if err != nil {
glog.Errorf("mig_id=%d: Table swap failed.", migration.Id)
return "", err
}
return oldTable, nil
}
// killMigration kills pt-osc and cleans up after a migration
func (runner *runner) killMigration(currentMigration *migration.Migration) error {
err := killPtOsc(currentMigration)
if err != nil {
return err
}
err = runner.createAndRetrieveFiles(currentMigration)
if err != nil {
return err
}
// we want to clean up the migration (drop triggers, shadow table, etc.) regardless of
// whether or not the migration is running on this host (or running at all)
glog.Infof("mig_id=%d: cleaning up.", currentMigration.Id)
err = CleanUp(currentMigration)
if err != nil {
glog.Errorf("mig_id=%d: error cleaning up (error: %s)", currentMigration.Id, err)
return ErrPtOscCleanUp
}
return nil
}
// execPtOsc shells out and uses pt-osc to actually run a migration.
func (runner *runner) execPtOsc(currentMigration *migration.Migration,
ptOscOptionGenerator commandOptionGenerator, copyPercentChan chan int, unstageDone bool) (bool, error) {
// unstageDone = whether or not unstagedMigrationsWaitGroup has already had .Done() called on it
defer func() {
if !unstageDone {
unstagedMigrationsWaitGroup.Done()
}
}()
canceled := false
var fileRoutineWaitGroup sync.WaitGroup
err := runner.createAndRetrieveFiles(currentMigration)
if err != nil {
return canceled, err
}
ptOscLogFile, ptOscLogWriter, err := setupLogWriter(currentMigration.LogFile)
if err != nil {
glog.Errorf("mig_id=%d: error creating pt-osc log file '%s' (error: %s)", currentMigration.Id, currentMigration.LogFile, err)
return canceled, ErrPtOscExec
}
defer ptOscLogFile.Close()
// generate the pt-osc command to run
commandOptions := ptOscOptionGenerator(currentMigration)
glog.Infof("mig_id=%d: Running %s %v", currentMigration.Id, runner.PtOscPath, strings.Join(commandOptions, " "))
cmd := exec.Command(runner.PtOscPath, commandOptions...)
// capture stdout and stderr of the command
stdout, err := cmd.StdoutPipe()
if err != nil {
glog.Errorf("mig_id=%d: error getting stdout pipe for pt-osc exec (error: %s)", currentMigration.Id, err)
return canceled, ErrPtOscExec
}
stderr, err := cmd.StderrPipe()
if err != nil {
glog.Errorf("mig_id=%d: error getting stderr pipe for pt-osc exec (error: %s)", currentMigration.Id, err)
return canceled, ErrPtOscExec
}
// start the pt-osc comand
if err := cmd.Start(); err != nil {
glog.Errorf("mig_id=%d: error starting pt-osc exec (error: %s)", currentMigration.Id, err)
return canceled, ErrPtOscExec
}
// setup a channel and goroutine for logging output of stdout/stderr
ptOscLogChan := make(chan string)
fileRoutineWaitGroup.Add(1)
fileSyncWaitGroup.Add(1)
go runner.writeToPtOscLog(ptOscLogWriter, ptOscLogChan, writeLineToPtOscLog, currentMigration.Id, &fileRoutineWaitGroup)
// setup a goroutine for sending statefiles to the api
ptOscStateFileChan := make(chan string)
fileRoutineWaitGroup.Add(1)
fileSyncWaitGroup.Add(1)
go runner.syncStateFile(currentMigration, ptOscStateFileChan, &fileRoutineWaitGroup)
// setup goroutines for watching stdout/stderr of the command
stdoutErrChan := make(chan error)
stderrErrChan := make(chan error)
go currentMigration.WatchMigrationStdout(stdout, stdoutErrChan, ptOscLogChan)
if currentMigration.Status == migration.RunMigrationStatus {
// setup a goroutine to continually update the % copied of the migration
fileRoutineWaitGroup.Add(1)
fileSyncWaitGroup.Add(1)
go runner.updateMigrationCopyPercentage(currentMigration, copyPercentChan, &fileRoutineWaitGroup)
go currentMigration.WatchMigrationCopyStderr(stderr, copyPercentChan, stderrErrChan, ptOscLogChan)
} else {
go currentMigration.WatchMigrationStderr(stderr, stderrErrChan, ptOscLogChan)
}
// save the pid of the pt-osc process
currentMigration.Pid = cmd.Process.Pid
glog.Infof("mig_id=%d: pt-osc pid for status %d is %d.", currentMigration.Id, currentMigration.Status, currentMigration.Pid)
// add the migration id and pid to the running migration map
runningMigMutex.Lock()
runningMigrations[currentMigration.Id] = currentMigration.Pid
runningMigMutex.Unlock()
if !unstageDone {
unstageDone = true
unstagedMigrationsWaitGroup.Done()
}
// wait for both stdout and stderr error channels to receive a signal
stdoutErr := <-stdoutErrChan
stderrErr := <-stderrErrChan
close(ptOscLogChan)
close(ptOscStateFileChan)
// remove the migration id from the running migration map
runningMigMutex.Lock()
delete(runningMigrations, currentMigration.Id)
runningMigMutex.Unlock()
// get the exit status of the command. if it was sent a SIGKILL (most likely
// by another goroutine) we want to know because we will treat it differently
failed := false
if err := cmd.Wait(); err != nil {
if exiterr, ok := err.(*exec.ExitError); ok {
if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
exitSignal := status.Signal().String()
glog.Infof("mig_id=%d: exit signal was %s.", currentMigration.Id, exitSignal)
if (exitSignal == SIGKILLSignal) && (currentMigration.Status == migration.RunMigrationStatus) {
// was killed
glog.Infof("mig_id=%d: migration must have been canceled", currentMigration.Id)
canceled = true
} else if currentMigration.Status == migration.RunMigrationStatus {
// died for an unexpected reason
glog.Infof("mig_id=%d: migration died for an unexpected reason", currentMigration.Id)
failed = true
}
}
}
} else {
if (stderrErr == nil) && (currentMigration.Status == migration.RunMigrationStatus) {
// wasn't killed. copy completed 100%
glog.Infof("mig_id=%d: updating migration with copy percentage of 100", currentMigration.Id)
copyPercentChan <- 100
}
}
if copyPercentChan != nil {
glog.Infof("Closing copy percent channel")
close(copyPercentChan)
}
fileRoutineWaitGroup.Wait() // wait for go routines to finish
// favor returning error from unexpected failure, then error from stderr,
// and lastly error from stdout
if failed {
return canceled, ErrUnexpectedExit
} else if stderrErr != nil {
return canceled, stderrErr
} else if stdoutErr != nil {
return canceled, stdoutErr
}
return canceled, nil
}
// unstageRunnableMigration tries to unstage ("claim") migrations that are runnable
func (runner *runner) unstageRunnableMigration(currentMigration rest.RestResponseItem) (*migration.Migration, error) {
migrationStatusField, ok := currentMigration["status"].(float64)
if ok == false {
glog.Errorf("Failed to get migration status for the following migration: %v", currentMigration)
return nil, ErrInvalidMigration
}
migrationStatus := int(migrationStatusField)
// Manually define the statuses to run
if intInArray(migrationStatus, statusesToRun) {
glog.Infof("Status = %d is in the list of statuses to run, so continuing.", migrationStatus)
migrationIdFieldFloat, ok := currentMigration["id"].(float64)
if ok == false {
glog.Errorf("Failed to get migration id for the "+
"following migration: %v", currentMigration)
return nil, ErrInvalidMigration
}
migrationIdField := int(migrationIdFieldFloat)
// check if the migration is already pinned to a particular host
pinnedHostname := currentMigration["run_host"]
if pinnedHostname != nil {
pinnedHostname = pinnedHostname.(string)
if pinnedHostname != runner.Hostname {
glog.Errorf("mig_id=%d: migration already pinned to %s. Skipping.",
migrationIdField, pinnedHostname)
return nil, ErrNotRunning
}
}
customOptions := make(map[string]string)
if val, ok := currentMigration["custom_options"]; ok && val != nil {
json.Unmarshal([]byte(currentMigration["custom_options"].(string)), &customOptions)
}
// log and statefiles are stored in log directory. ex for mig with id 7: /path/to/logs/statefile-id-7.txt
filesDir := runner.LogDir + "id-" + strconv.Itoa(int(migrationIdField)) + "/"
stateFile := filesDir + "statefile.txt"
logFile := filesDir + "ptosc-output.log"
mig := &migration.Migration{
Id: migrationIdField,
Status: migrationStatus,
Host: currentMigration["host"].(string),
Port: int(currentMigration["port"].(float64)),
Database: currentMigration["database"].(string),
Table: currentMigration["table"].(string),
DdlStatement: currentMigration["ddl_statement"].(string),
FinalInsert: currentMigration["final_insert"].(string),
FilesDir: filesDir,
StateFile: stateFile,
LogFile: logFile,
PendingDropsDb: runner.PendingDropsDb,
CustomOptions: customOptions,
}
// some extra fields when we're not killing a migration
if (migrationStatus != migration.CancelStatus) && (migrationStatus != migration.PauseStatus) {
mig.RunType = int(currentMigration["runtype"].(float64))
mig.Mode = int(currentMigration["mode"].(float64))
mig.Action = int(currentMigration["action"].(float64))
}
// allow setting overrides for the host and db from config file.
// this is useful for safe testing in a staging environment
if runner.HostOverride != "" {
mig.Host = runner.HostOverride
}
if runner.PortOverride != 0 {
mig.Port = runner.PortOverride
}
if runner.DatabaseOverride != "" {
mig.Database = runner.DatabaseOverride
}
// if pending_drops database isn't defined, set it to be the same
// database that the migration is on.
if mig.PendingDropsDb == "" {
mig.PendingDropsDb = mig.Database
}
// only claim the migration if we successfully unstage it
urlParams := map[string]string{"id": strconv.Itoa(mig.Id)}
_, err := runner.RestClient.Unstage(urlParams)
if err != nil {
return nil, err
}
glog.Infof("mig_id=%d: Successfully unstaged.", mig.Id)
return mig, nil
}
glog.Infof("Status = %d is not in the list of statuses to run, so skipping.", migrationStatus)
return nil, nil
}