121 lines
3.8 KiB
Go
121 lines
3.8 KiB
Go
// Copyright 2016 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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"runtime"
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"strings"
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"time"
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"github.com/pingcap/errors"
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"github.com/pingcap/parser"
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log "github.com/sirupsen/logrus"
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)
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const (
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// DefaultMaxRetries indicates the max retry count.
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DefaultMaxRetries = 30
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// RetryInterval indicates retry interval.
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RetryInterval uint64 = 500
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// GCTimeFormat is the format that gc_worker used to store times.
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GCTimeFormat = "20060102-15:04:05 -0700"
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)
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// RunWithRetry will run the f with backoff and retry.
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// retryCnt: Max retry count
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// backoff: When run f failed, it will sleep backoff * triedCount time.Millisecond.
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// Function f should have two return value. The first one is an bool which indicate if the err if retryable.
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// The second is if the f meet any error.
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func RunWithRetry(retryCnt int, backoff uint64, f func() (bool, error)) (err error) {
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for i := 1; i <= retryCnt; i++ {
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var retryAble bool
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retryAble, err = f()
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if err == nil || !retryAble {
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return errors.Trace(err)
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}
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sleepTime := time.Duration(backoff*uint64(i)) * time.Millisecond
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time.Sleep(sleepTime)
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}
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return errors.Trace(err)
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}
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// GetStack gets the stacktrace.
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func GetStack() []byte {
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const size = 4096
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buf := make([]byte, size)
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stackSize := runtime.Stack(buf, false)
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buf = buf[:stackSize]
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return buf
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}
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// WithRecovery wraps goroutine startup call with force recovery.
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// it will dump current goroutine stack into log if catch any recover result.
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// exec: execute logic function.
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// recoverFn: handler will be called after recover and before dump stack, passing `nil` means noop.
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func WithRecovery(exec func(), recoverFn func(r interface{})) {
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defer func() {
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r := recover()
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if recoverFn != nil {
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recoverFn(r)
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}
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if r != nil {
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buf := GetStack()
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log.Errorf("panic in the recoverable goroutine: %v, stack trace:\n%s", r, buf)
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}
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}()
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exec()
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}
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// CompatibleParseGCTime parses a string with `GCTimeFormat` and returns a time.Time. If `value` can't be parsed as that
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// format, truncate to last space and try again. This function is only useful when loading times that saved by
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// gc_worker. We have changed the format that gc_worker saves time (removed the last field), but when loading times it
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// should be compatible with the old format.
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func CompatibleParseGCTime(value string) (time.Time, error) {
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t, err := time.Parse(GCTimeFormat, value)
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if err != nil {
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// Remove the last field that separated by space
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parts := strings.Split(value, " ")
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prefix := strings.Join(parts[:len(parts)-1], " ")
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t, err = time.Parse(GCTimeFormat, prefix)
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}
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if err != nil {
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err = errors.Errorf("string \"%v\" doesn't has a prefix that matches format \"%v\"", value, GCTimeFormat)
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}
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return t, err
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}
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const (
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// syntaxErrorPrefix is the common prefix for SQL syntax error in TiDB.
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syntaxErrorPrefix = "You have an error in your SQL syntax; check the manual that corresponds to your TiDB version for the right syntax to use"
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)
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// SyntaxError converts parser error to TiDB's syntax error.
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func SyntaxError(err error) error {
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if err == nil {
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return nil
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}
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log.Errorf("%+v", err)
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return parser.ErrParse.GenWithStackByArgs(syntaxErrorPrefix, err.Error())
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}
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// SyntaxWarn converts parser warn to TiDB's syntax warn.
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func SyntaxWarn(err error) error {
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if err == nil {
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return nil
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}
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return parser.ErrParse.GenWithStackByArgs(syntaxErrorPrefix, err.Error())
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}
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