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validator.go
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validator.go
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// Copyright 2022 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package validator
import (
"context"
"net/url"
"github.com/pingcap/tiflow/cdc/model"
"github.com/pingcap/tiflow/cdc/sink/dmlsink/factory"
"github.com/pingcap/tiflow/pkg/config"
cerror "github.com/pingcap/tiflow/pkg/errors"
"github.com/pingcap/tiflow/pkg/pdutil"
"github.com/pingcap/tiflow/pkg/sink"
pmysql "github.com/pingcap/tiflow/pkg/sink/mysql"
"github.com/pingcap/tiflow/pkg/util"
)
// Validate sink if given valid parameters.
// TODO: For now, we create a real sink instance and validate it.
// Maybe we should support the dry-run mode to validate sink.
func Validate(ctx context.Context,
changefeedID model.ChangeFeedID,
sinkURI string, cfg *config.ReplicaConfig,
pdClock pdutil.Clock,
) error {
uri, err := preCheckSinkURI(sinkURI)
if err != nil {
return err
}
if err := checkSyncPointSchemeCompatibility(uri, cfg); err != nil {
return err
}
if util.GetOrZero(cfg.BDRMode) {
err := checkBDRMode(ctx, uri, cfg)
if err != nil {
return err
}
}
ctx, cancel := context.WithCancel(ctx)
s, err := factory.New(ctx, changefeedID, sinkURI, cfg, make(chan error), pdClock)
if err != nil {
cancel()
return err
}
cancel()
s.Close()
return nil
}
// checkSyncPointSchemeCompatibility checks if the sink scheme is compatible
// with the syncpoint feature.
func checkSyncPointSchemeCompatibility(
uri *url.URL,
cfg *config.ReplicaConfig,
) error {
if util.GetOrZero(cfg.EnableSyncPoint) &&
!sink.IsMySQLCompatibleScheme(uri.Scheme) {
return cerror.ErrSinkURIInvalid.
GenWithStack(
"sink uri scheme is not supported with syncpoint enabled"+
"sink uri: %s", uri,
)
}
return nil
}
// preCheckSinkURI do some pre-check for sink URI.
// 1. Check if sink URI is empty.
// 2. Check if we use correct IPv6 format in URI.(if needed)
func preCheckSinkURI(sinkURIStr string) (*url.URL, error) {
if sinkURIStr == "" {
return nil, cerror.ErrSinkURIInvalid.GenWithStack("sink uri is empty")
}
sinkURI, err := url.Parse(sinkURIStr)
if err != nil {
return nil, cerror.WrapError(cerror.ErrSinkURIInvalid, err)
}
// Check if we use the correct IPv6 address format.
// Notice: We should not check the host name is empty or not,
// because we have blackhole sink which has empty host name.
// Also notice the host name different from host(host+port).
if util.IsIPv6Address(sinkURI.Hostname()) &&
!util.IsValidIPv6AddressFormatInURI(sinkURI.Host) {
return nil, cerror.ErrSinkURIInvalid.GenWithStack("sink uri host is not valid IPv6 address, " +
"when using IPv6 address in URI, please use [ipv6-address]:port")
}
return sinkURI, nil
}
func checkBDRMode(ctx context.Context, sinkURI *url.URL, replicaConfig *config.ReplicaConfig) error {
maskSinkURI, err := util.MaskSinkURI(sinkURI.String())
if err != nil {
return err
}
if !sink.IsMySQLCompatibleScheme(sinkURI.Scheme) {
return cerror.ErrSinkURIInvalid.
GenWithStack("sink uri scheme is not supported in BDR mode, sink uri: %s", maskSinkURI)
}
cfg := pmysql.NewConfig()
id := model.ChangeFeedID{Namespace: "default", ID: "sink-verify"}
err = cfg.Apply(config.GetGlobalServerConfig().TZ, id, sinkURI, replicaConfig)
if err != nil {
return err
}
dsn, err := pmysql.GenBasicDSN(sinkURI, cfg)
if err != nil {
return err
}
testDB, err := pmysql.GetTestDB(ctx, dsn, pmysql.CreateMySQLDBConn)
if err != nil {
return err
}
defer testDB.Close()
supported, err := pmysql.CheckIfBDRModeIsSupported(ctx, testDB)
if err != nil {
return err
}
if !supported {
return cerror.ErrSinkURIInvalid.
GenWithStack("downstream database does not support BDR mode, "+
"please check your config, sink uri: %s", maskSinkURI)
}
return nil
}