package logging import ( "encoding/json" "net/http" "strings" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) // defaultTraceIdHeader is the default header used as a trace id. const defaultTraceIDHeader = "X-Smallstep-Id" // ErrorKey defines the key used to log errors. var ErrorKey = logrus.ErrorKey // Logger is an alias of logrus.Logger. type Logger struct { *logrus.Logger name string traceHeader string } // loggerConfig represents the configuration options for the logger. type loggerConfig struct { Format string `json:"format"` TraceHeader string `json:"traceHeader"` } // New initializes the logger with the given options. func New(name string, raw json.RawMessage) (*Logger, error) { var config loggerConfig if err := json.Unmarshal(raw, &config); err != nil { return nil, errors.Wrap(err, "error unmarshalling logging attribute") } var formatter logrus.Formatter switch strings.ToLower(config.Format) { case "", "text": case "json": formatter = new(logrus.JSONFormatter) case "common": formatter = new(CommonLogFormat) default: return nil, errors.Errorf("unsupported logger.format '%s'", config.Format) } logger := &Logger{ Logger: logrus.New(), name: name, traceHeader: config.TraceHeader, } if formatter != nil { logger.Formatter = formatter } return logger, nil } // GetImpl returns the real implementation of the logger. func (l *Logger) GetImpl() *logrus.Logger { return l.Logger } // GetTraceHeader returns the trace header configured func (l *Logger) GetTraceHeader() string { if l.traceHeader == "" { return defaultTraceIDHeader } return l.traceHeader } // Middleware returns the logger middleware that will trace the request of the // given handler. func (l *Logger) Middleware(next http.Handler) http.Handler { return NewLoggerHandler(l.name, l, next) }