128 lines
3.5 KiB
Go
128 lines
3.5 KiB
Go
// Copyright 2023 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package objstore
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import (
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"context"
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"net/http"
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"sync/atomic"
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"github.com/pingcap/errors"
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"github.com/pingcap/log"
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"github.com/pingcap/tidb/br/pkg/utils/iter"
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"github.com/pingcap/tidb/pkg/objstore/storeapi"
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"github.com/pingcap/tidb/pkg/sessionctx/variable"
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"github.com/pingcap/tidb/pkg/util"
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"go.uber.org/zap"
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"golang.org/x/sync/errgroup"
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)
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func init() {
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variable.ValidateCloudStorageURI = ValidateCloudStorageURI
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}
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// ValidateCloudStorageURI makes validation for tidb_cloud_storage_uri.
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func ValidateCloudStorageURI(ctx context.Context, uri string) error {
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b, err := ParseBackend(uri, nil)
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if err != nil {
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return err
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}
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// To make goleak happy.
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httpCli := http.Client{
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Transport: &http.Transport{
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DisableKeepAlives: true,
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},
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}
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storage, err := New(ctx, b, &storeapi.Options{
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HTTPClient: &httpCli,
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CheckPermissions: []storeapi.Permission{
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storeapi.ListObjects,
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storeapi.GetObject,
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storeapi.AccessBuckets,
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},
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})
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if err != nil {
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return err
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}
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storage.Close()
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return nil
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}
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// activeUploadWorkerCnt is the active upload worker count, it only works for GCS.
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// For S3, we cannot get it.
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var activeUploadWorkerCnt atomic.Int64
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// GetActiveUploadWorkerCount returns the active upload worker count.
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func GetActiveUploadWorkerCount() int64 {
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return activeUploadWorkerCnt.Load()
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}
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// UnmarshalDir iterates over a prefix, then "unmarshal" the content of each file it met with the unmarshal function.
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// Returning an iterator that yields the unmarshaled content.
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// The "unmarshal" function should put the result of unmarshalling to the `target` argument.
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func UnmarshalDir[T any](ctx context.Context, walkOpt *storeapi.WalkOption, s storeapi.Storage, unmarshal func(target *T, name string, content []byte) error) iter.TryNextor[*T] {
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ch := make(chan *T)
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errCh := make(chan error, 1)
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reader := func() {
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defer close(ch)
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pool := util.NewWorkerPool(128, "metadata")
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eg, ectx := errgroup.WithContext(ctx)
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err := s.WalkDir(ectx, walkOpt, func(path string, size int64) error {
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pool.ApplyOnErrorGroup(eg, func() error {
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metaBytes, err := s.ReadFile(ectx, path)
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if err != nil {
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log.Error("failed to read file", zap.String("file", path))
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return errors.Annotatef(err, "during reading meta file %s from storage", path)
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}
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var meta T
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if err := unmarshal(&meta, path, metaBytes); err != nil {
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return errors.Annotatef(err, "failed to unmarshal file %s", path)
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}
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select {
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case ch <- &meta:
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case <-ctx.Done():
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return ctx.Err()
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}
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return nil
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})
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return nil
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})
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if err == nil {
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err = eg.Wait()
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}
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if err != nil {
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select {
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case errCh <- err:
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case <-ctx.Done():
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}
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}
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}
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go reader()
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return iter.Func(func(ctx context.Context) iter.IterResult[*T] {
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select {
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case <-ctx.Done():
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return iter.Throw[*T](ctx.Err())
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case err := <-errCh:
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return iter.Throw[*T](err)
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case meta, ok := <-ch:
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if !ok {
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return iter.Done[*T]()
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}
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return iter.Emit(meta)
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}
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})
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}
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