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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| // Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. | ||
| // | ||
| // 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 logging | ||
|
|
||
| import ( | ||
| "flag" | ||
| "os" | ||
| "strings" | ||
| "sync" | ||
|
|
||
| "go.uber.org/zap" | ||
| "go.uber.org/zap/zapcore" | ||
| lumberjack "gopkg.in/natefinch/lumberjack.v2" | ||
| ) | ||
|
|
||
| var ( | ||
| lvl = zapcore.InfoLevel | ||
| logJSON = false | ||
| logfilePath = "" | ||
| config *zap.Config | ||
| mu sync.Mutex | ||
| ) | ||
|
|
||
| func init() { | ||
| flag.Var(&lvl, "log-level", "Adjusts the level of the logs that will be omitted.") | ||
| flag.BoolVar(&logJSON, "log-json", logJSON, "Log in json format.") | ||
| flag.StringVar(&logfilePath, "logfile-path", "", "If specified, write log messages to a file at this path.") | ||
| } | ||
|
|
||
| // Options holds the zap logger configuration. | ||
| type Options struct { | ||
| LogLevel *zapcore.Level | ||
| Config *zap.Config | ||
| } | ||
|
|
||
| // Level gets the current log level. | ||
| func Level() *zap.AtomicLevel { | ||
| return &config.Level | ||
| } | ||
|
|
||
| // Logger builds a new logger based on the given flags. | ||
| func Logger() *zap.Logger { | ||
| mu.Lock() | ||
| defer mu.Unlock() | ||
|
|
||
| var cfg zap.Config | ||
|
|
||
| if !logJSON { | ||
| cfg = zap.NewDevelopmentConfig() | ||
| } else { | ||
| cfg = zap.NewProductionConfig() | ||
| } | ||
|
|
||
| // Extract log fields from environment variables. | ||
| envFields := FieldsFromEnv(os.Environ()) | ||
|
|
||
| options := []zap.Option{ | ||
| zap.AddStacktrace(zapcore.FatalLevel), | ||
| zap.WrapCore(func(c zapcore.Core) zapcore.Core { | ||
| return c.With(envFields) | ||
| }), | ||
| } | ||
|
|
||
| if len(logfilePath) > 0 { | ||
| w := zapcore.AddSync(&lumberjack.Logger{ | ||
| Filename: logfilePath, | ||
| MaxSize: 10, // megabytes | ||
| MaxBackups: 3, | ||
| MaxAge: 28, // days | ||
| }) | ||
| var enc zapcore.Encoder | ||
| if logJSON { | ||
| enc = zapcore.NewJSONEncoder(cfg.EncoderConfig) | ||
| } else { | ||
| enc = zapcore.NewConsoleEncoder(cfg.EncoderConfig) | ||
| } | ||
| core := zapcore.NewCore(enc, w, lvl) | ||
| options = append(options, zap.WrapCore(func(zapcore.Core) zapcore.Core { | ||
| return core | ||
| })) | ||
| } | ||
|
|
||
| if config == nil { | ||
| config = &cfg | ||
| config.Level.SetLevel(lvl) | ||
| config.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder | ||
| } | ||
|
|
||
| logger, err := config.Build( | ||
| // We handle this via errors package for 99% of the stuff so only | ||
| // enable this at the fatal/panic level. | ||
| options..., | ||
| ) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| return logger | ||
| } | ||
|
|
||
| // FieldsFromEnv extracts log fields from environment variables. | ||
| // If an environment variable starts with LOG_FIELD_, the suffix is extracted | ||
| // and split on =. The first part is used for the name and the second for the | ||
| // value. | ||
| // For example, LOG_FIELD_foo=bar would result in a field named "foo" with the | ||
| // value "bar". | ||
| func FieldsFromEnv(env []string) []zapcore.Field { | ||
| const logfieldPrefix = "LOG_FIELD_" | ||
|
|
||
| fields := []zapcore.Field{} | ||
| for _, s := range env { | ||
| if !strings.HasPrefix(s, logfieldPrefix) || len(s) < (len(logfieldPrefix)+1) { | ||
| continue | ||
| } | ||
| s = s[len(logfieldPrefix):] | ||
| parts := strings.SplitN(s, "=", 2) | ||
| if len(parts) != 2 { | ||
| continue | ||
| } | ||
| fields = append(fields, zap.String(parts[0], parts[1])) | ||
| } | ||
| return fields | ||
| } |
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