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feat(cli): add statement-log-file option
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Dmitry Kropachev
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Dec 19, 2023
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| // Copyright 2019 ScyllaDB | ||
| // | ||
| // 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, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package stmtlogger | ||
|
|
||
| import ( | ||
| "log" | ||
| "os" | ||
| "strconv" | ||
| "sync/atomic" | ||
| "time" | ||
|
|
||
| "github.com/pkg/errors" | ||
|
|
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| "github.com/scylladb/gemini/pkg/typedef" | ||
| ) | ||
|
|
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| const ( | ||
| defaultChanSize = 1000 | ||
| errorsOnFileLimit = 5 | ||
| ) | ||
|
|
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| type FileLogger struct { | ||
| fd *os.File | ||
| activeChannel atomic.Pointer[loggerChan] | ||
| channel loggerChan | ||
| filename string | ||
| isFileNonOperational bool | ||
| } | ||
|
|
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| type loggerChan chan logRec | ||
|
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| type logRec struct { | ||
| stmt *typedef.Stmt | ||
| ts time.Time | ||
| } | ||
|
|
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| func (fl *FileLogger) LogStmt(stmt *typedef.Stmt) { | ||
| ch := fl.activeChannel.Load() | ||
| if ch != nil { | ||
| *ch <- logRec{ | ||
| stmt: stmt, | ||
| } | ||
| } | ||
| } | ||
|
|
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| func (fl *FileLogger) LogStmtWithTimeStamp(stmt *typedef.Stmt, ts time.Time) { | ||
| ch := fl.activeChannel.Load() | ||
| if ch != nil { | ||
| *ch <- logRec{ | ||
| stmt: stmt, | ||
| ts: ts, | ||
| } | ||
| } | ||
| } | ||
|
|
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| func (fl *FileLogger) Close() error { | ||
| return fl.fd.Close() | ||
| } | ||
|
|
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| func (fl *FileLogger) committer() { | ||
| var err2 error | ||
|
|
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| defer func() { | ||
| fl.activeChannel.Swap(nil) | ||
| close(fl.channel) | ||
| }() | ||
|
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| errsAtRow := 0 | ||
|
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| for rec := range fl.channel { | ||
| if fl.isFileNonOperational { | ||
| continue | ||
| } | ||
|
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| _, err1 := fl.fd.Write([]byte(rec.stmt.PrettyCQL())) | ||
| opType := rec.stmt.QueryType.OpType() | ||
| if rec.ts.IsZero() || !(opType == typedef.OpInsert || opType == typedef.OpUpdate || opType == typedef.OpDelete) { | ||
| _, err2 = fl.fd.Write([]byte(";\n")) | ||
| } else { | ||
| _, err2 = fl.fd.Write([]byte(" USING TIMESTAMP " + strconv.FormatInt(rec.ts.UnixNano()/1000, 10) + ";\n")) | ||
| } | ||
| if err2 == nil && err1 == nil { | ||
| errsAtRow = 0 | ||
| continue | ||
| } | ||
|
|
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| if errors.Is(err2, os.ErrClosed) || errors.Is(err1, os.ErrClosed) { | ||
| fl.isFileNonOperational = true | ||
| return | ||
| } | ||
|
|
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| errsAtRow++ | ||
| if errsAtRow > errorsOnFileLimit { | ||
| fl.isFileNonOperational = true | ||
| } | ||
|
|
||
| if err2 != nil { | ||
| err1 = err2 | ||
| } | ||
| log.Printf("failed to write to file %q: %s", fl.filename, err1) | ||
| return | ||
| } | ||
| } | ||
|
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| func NewFileLogger(filename string) (*FileLogger, error) { | ||
| if filename == "" { | ||
| return nil, nil | ||
| } | ||
| fd, err := os.OpenFile(filename, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| out := &FileLogger{ | ||
| filename: filename, | ||
| fd: fd, | ||
| channel: make(loggerChan, defaultChanSize), | ||
| } | ||
| out.activeChannel.Store(&out.channel) | ||
|
|
||
| go out.committer() | ||
| return out, nil | ||
| } |
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