/
logger.go
42 lines (37 loc) · 1.29 KB
/
logger.go
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package logger
import (
"os"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
const LOG_FILE_NAME = "spanner-migration-tool.log"
var Log *zap.Logger
func InitializeLogger(inputLogLevel string) error {
// create zapper encoding config object
config := zap.NewProductionEncoderConfig()
// set logging timestamp format
config.EncodeTime = zapcore.ISO8601TimeEncoder
// create encoder for logs that are written to file
fileEncoder := zapcore.NewJSONEncoder(config)
// create encoder for logs that are written to console
// we create two encoders because we want to write human readable logs to console and
// JSON parsable logs to the file
consoleEncoder := zapcore.NewConsoleEncoder(config)
// specify log file.
logFile, _ := os.OpenFile(LOG_FILE_NAME, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
writer := zapcore.AddSync(logFile)
// create and set the log level from the user input
zapLogLevel := new(zapcore.Level)
err := zapLogLevel.Set(inputLogLevel)
if err != nil {
return err
}
logLevel := zap.NewAtomicLevelAt(*zapLogLevel)
// create the logger
core := zapcore.NewTee(
zapcore.NewCore(fileEncoder, writer, logLevel),
zapcore.NewCore(consoleEncoder, zapcore.AddSync(os.Stdout), logLevel),
)
Log = zap.New(core, zap.AddCaller(), zap.AddStacktrace(zapcore.ErrorLevel))
return nil
}