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logstats: do not allocate memory while logging #15539
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,217 @@ | ||
| /* | ||
| Copyright 2024 The Vitess Authors. | ||
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| 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 | ||
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| http://www.apache.org/licenses/LICENSE-2.0 | ||
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| 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. | ||
| */ | ||
|
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| package logstats | ||
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| import ( | ||
| "io" | ||
| "slices" | ||
| "strconv" | ||
| "strings" | ||
| "sync" | ||
| "time" | ||
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| "vitess.io/vitess/go/hack" | ||
| "vitess.io/vitess/go/sqltypes" | ||
| querypb "vitess.io/vitess/go/vt/proto/query" | ||
| ) | ||
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| type logbv struct { | ||
| Name string | ||
| BVar *querypb.BindVariable | ||
| } | ||
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| // Logger is a zero-allocation logger for logstats. | ||
| // It can output logs as JSON or as plaintext, following the commonly used | ||
| // logstats format that is shared between the tablets and the gates. | ||
| type Logger struct { | ||
| b []byte | ||
| bvars []logbv | ||
| n int | ||
| json bool | ||
| } | ||
|
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| func sortBVars(sorted []logbv, bvars map[string]*querypb.BindVariable) []logbv { | ||
| for k, bv := range bvars { | ||
| sorted = append(sorted, logbv{k, bv}) | ||
| } | ||
| slices.SortFunc(sorted, func(a, b logbv) int { | ||
| return strings.Compare(a.Name, b.Name) | ||
| }) | ||
| return sorted | ||
| } | ||
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| func (log *Logger) appendBVarsJSON(b []byte, bvars map[string]*querypb.BindVariable, full bool) []byte { | ||
| log.bvars = sortBVars(log.bvars[:0], bvars) | ||
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| b = append(b, '{') | ||
| for i, bv := range log.bvars { | ||
| if i > 0 { | ||
| b = append(b, ',', ' ') | ||
| } | ||
| b = strconv.AppendQuote(b, bv.Name) | ||
| b = append(b, `: {"type": `...) | ||
| b = strconv.AppendQuote(b, querypb.Type_name[int32(bv.BVar.Type)]) | ||
| b = append(b, `, "value": `...) | ||
|
|
||
| if sqltypes.IsIntegral(bv.BVar.Type) || sqltypes.IsFloat(bv.BVar.Type) { | ||
| b = append(b, bv.BVar.Value...) | ||
| } else if bv.BVar.Type == sqltypes.Tuple { | ||
| b = append(b, '"') | ||
| b = strconv.AppendInt(b, int64(len(bv.BVar.Values)), 10) | ||
| b = append(b, ` items"`...) | ||
| } else { | ||
| if full { | ||
| b = strconv.AppendQuote(b, hack.String(bv.BVar.Value)) | ||
| } else { | ||
| b = append(b, '"') | ||
| b = strconv.AppendInt(b, int64(len(bv.BVar.Values)), 10) | ||
| b = append(b, ` bytes"`...) | ||
| } | ||
| } | ||
| b = append(b, '}') | ||
| } | ||
| return append(b, '}') | ||
| } | ||
|
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||
| func (log *Logger) Init(json bool) { | ||
| log.n = 0 | ||
| log.json = json | ||
| if log.json { | ||
| log.b = append(log.b, '{') | ||
| } | ||
| } | ||
|
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| func (log *Logger) Redacted() { | ||
| log.String("[REDACTED]") | ||
| } | ||
|
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| func (log *Logger) Key(key string) { | ||
| if log.json { | ||
| if log.n > 0 { | ||
| log.b = append(log.b, ',', ' ') | ||
| } | ||
| log.b = append(log.b, '"') | ||
| log.b = append(log.b, key...) | ||
| log.b = append(log.b, '"', ':', ' ') | ||
| } else { | ||
| if log.n > 0 { | ||
| log.b = append(log.b, '\t') | ||
| } | ||
| } | ||
| log.n++ | ||
| } | ||
|
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| func (log *Logger) StringUnquoted(value string) { | ||
| if log.json { | ||
| log.b = strconv.AppendQuote(log.b, value) | ||
| } else { | ||
| log.b = append(log.b, value...) | ||
| } | ||
| } | ||
|
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| func (log *Logger) TabTerminated() { | ||
| if !log.json { | ||
| log.b = append(log.b, '\t') | ||
| } | ||
| } | ||
|
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| func (log *Logger) String(value string) { | ||
| log.b = strconv.AppendQuote(log.b, value) | ||
| } | ||
|
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| func (log *Logger) StringSingleQuoted(value string) { | ||
| if log.json { | ||
| log.b = strconv.AppendQuote(log.b, value) | ||
| } else { | ||
| log.b = append(log.b, '\'') | ||
| log.b = append(log.b, value...) | ||
| log.b = append(log.b, '\'') | ||
| } | ||
| } | ||
|
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| func (log *Logger) Time(t time.Time) { | ||
| const timeFormat = "2006-01-02 15:04:05.000000" | ||
| if log.json { | ||
| log.b = append(log.b, '"') | ||
| log.b = t.AppendFormat(log.b, timeFormat) | ||
| log.b = append(log.b, '"') | ||
| } else { | ||
| log.b = t.AppendFormat(log.b, timeFormat) | ||
| } | ||
| } | ||
|
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| func (log *Logger) Duration(t time.Duration) { | ||
| log.b = strconv.AppendFloat(log.b, t.Seconds(), 'f', 6, 64) | ||
| } | ||
|
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| func (log *Logger) BindVariables(bvars map[string]*querypb.BindVariable, full bool) { | ||
| // the bind variables are printed as JSON in text mode because the original | ||
| // printing syntax, which was simply `fmt.Sprintf("%v")`, is not stable or | ||
| // safe to parse | ||
| log.b = log.appendBVarsJSON(log.b, bvars, full) | ||
| } | ||
|
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| func (log *Logger) Int(i int64) { | ||
| log.b = strconv.AppendInt(log.b, i, 10) | ||
| } | ||
|
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| func (log *Logger) Uint(u uint64) { | ||
| log.b = strconv.AppendUint(log.b, u, 10) | ||
| } | ||
|
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| func (log *Logger) Bool(b bool) { | ||
| log.b = strconv.AppendBool(log.b, b) | ||
| } | ||
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| func (log *Logger) Strings(strs []string) { | ||
| log.b = append(log.b, '[') | ||
| for i, t := range strs { | ||
| if i > 0 { | ||
| log.b = append(log.b, ',') | ||
| } | ||
| log.b = strconv.AppendQuote(log.b, t) | ||
| } | ||
| log.b = append(log.b, ']') | ||
| } | ||
|
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| func (log *Logger) Flush(w io.Writer) (err error) { | ||
| if log.json { | ||
| log.b = append(log.b, '}') | ||
| } | ||
| log.b = append(log.b, '\n') | ||
| _, err = w.Write(log.b) | ||
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| clear(log.bvars) | ||
| log.bvars = log.bvars[:0] | ||
| log.b = log.b[:0] | ||
| log.n = 0 | ||
|
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| loggerPool.Put(log) | ||
| return err | ||
| } | ||
|
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| var loggerPool = sync.Pool{New: func() any { | ||
| return &Logger{} | ||
| }} | ||
|
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| // NewLogger returns a new Logger instance to perform logstats logging. | ||
| // The logger must be initialized with (*Logger).Init before usage and | ||
| // flushed with (*Logger).Flush once all the key-values have been written | ||
| // to it. | ||
| func NewLogger() *Logger { | ||
| return loggerPool.Get().(*Logger) | ||
| } | ||
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maybe a line or two with the raison d'etre for this logger?