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|
package praefect
import (
"context"
"fmt"
"time"
"gitlab.com/gitlab-org/gitaly/internal/helper"
"gitlab.com/gitlab-org/gitaly/internal/praefect/models"
"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
"google.golang.org/grpc"
"github.com/sirupsen/logrus"
)
// Replicator performs the actual replication logic between two nodes
type Replicator interface {
Replicate(ctx context.Context, job ReplJob, target *grpc.ClientConn) error
}
type defaultReplicator struct {
log *logrus.Entry
}
func (dr defaultReplicator) Replicate(ctx context.Context, job ReplJob, targetCC *grpc.ClientConn) error {
repository := &gitalypb.Repository{
StorageName: job.TargetNode.Storage,
RelativePath: job.Repository.RelativePath,
}
remoteRepository := &gitalypb.Repository{
StorageName: job.SourceNode.Storage,
RelativePath: job.Repository.RelativePath,
}
repositoryClient := gitalypb.NewRepositoryServiceClient(targetCC)
remoteClient := gitalypb.NewRemoteServiceClient(targetCC)
// CreateRepository is idempotent
if _, err := repositoryClient.CreateRepository(ctx, &gitalypb.CreateRepositoryRequest{
Repository: repository,
}); err != nil {
return fmt.Errorf("failed to create repository: %v", err)
}
if _, err := remoteClient.FetchInternalRemote(ctx, &gitalypb.FetchInternalRemoteRequest{
Repository: repository,
RemoteRepository: remoteRepository,
}); err != nil {
return err
}
// TODO: ensure attribute files are synced
// https://gitlab.com/gitlab-org/gitaly/issues/1655
// TODO: ensure objects/info/alternates are synced
// https://gitlab.com/gitlab-org/gitaly/issues/1674
return nil
}
// ReplMgr is a replication manager for handling replication jobs
type ReplMgr struct {
log *logrus.Entry
datastore Datastore
coordinator *Coordinator
targetNode string // which replica is this replicator responsible for?
replicator Replicator // does the actual replication logic
// whitelist contains the project names of the repos we wish to replicate
whitelist map[string]struct{}
}
// ReplMgrOpt allows a replicator to be configured with additional options
type ReplMgrOpt func(*ReplMgr)
// NewReplMgr initializes a replication manager with the provided dependencies
// and options
func NewReplMgr(targetNode string, log *logrus.Entry, datastore Datastore, c *Coordinator, opts ...ReplMgrOpt) ReplMgr {
r := ReplMgr{
log: log,
datastore: datastore,
whitelist: map[string]struct{}{},
replicator: defaultReplicator{log},
targetNode: targetNode,
coordinator: c,
}
for _, opt := range opts {
opt(&r)
}
return r
}
// WithWhitelist will configure a whitelist for repos to allow replication
func WithWhitelist(whitelistedRepos []string) ReplMgrOpt {
return func(r *ReplMgr) {
for _, repo := range whitelistedRepos {
r.whitelist[repo] = struct{}{}
}
}
}
// WithReplicator overrides the default replicator
func WithReplicator(r Replicator) ReplMgrOpt {
return func(rm *ReplMgr) {
rm.replicator = r
}
}
// ScheduleReplication will store a replication job in the datastore for later
// execution. It filters out projects that are not whitelisted.
// TODO: add a parameter to delay replication
func (r ReplMgr) ScheduleReplication(ctx context.Context, repo models.Repository) error {
_, ok := r.whitelist[repo.RelativePath]
if !ok {
r.log.WithField(logKeyProjectPath, repo.RelativePath).
Infof("project %q is not whitelisted for replication", repo.RelativePath)
return nil
}
id, err := r.datastore.CreateReplicaReplJobs(repo.RelativePath)
if err != nil {
return err
}
r.log.Infof(
"replication manager for targetNode %q created replication job with ID %d",
r.targetNode,
id,
)
return nil
}
const (
jobFetchInterval = 10 * time.Millisecond
logWithReplJobID = "replication-job-ID"
)
// ProcessBacklog will process queued jobs. It will block while processing jobs.
func (r ReplMgr) ProcessBacklog(ctx context.Context) error {
for {
nodes, err := r.datastore.GetStorageNodes()
if err != nil {
return nil
}
for _, node := range nodes {
jobs, err := r.datastore.GetJobs(JobStateReady, node.ID, 10)
if err != nil {
return err
}
if len(jobs) == 0 {
r.log.Tracef("no jobs for %d, checking again in %s", node.ID, jobFetchInterval)
select {
// TODO: exponential backoff when no queries are returned
case <-time.After(jobFetchInterval):
continue
case <-ctx.Done():
return ctx.Err()
}
}
for _, job := range jobs {
r.log.WithField(logWithReplJobID, job.ID).
Infof("processing replication job %#v", job)
if err := r.datastore.UpdateReplJob(job.ID, JobStateInProgress); err != nil {
return err
}
ctx, err = helper.InjectGitalyServers(ctx, job.Repository.Primary.Storage, job.SourceNode.Address, "")
if err != nil {
return err
}
cc, err := r.coordinator.GetConnection(job.TargetNode.ID)
if err != nil {
return err
}
if err := r.replicator.Replicate(ctx, job, cc); err != nil {
r.log.WithField(logWithReplJobID, job.ID).WithError(err).Error("error when replicating")
return err
}
if err := r.datastore.UpdateReplJob(job.ID, JobStateComplete); err != nil {
return err
}
}
}
}
}
|
