108 lines
2.6 KiB
Go
108 lines
2.6 KiB
Go
// Copyright 2022 The TVL Contributors
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// SPDX-License-Identifier: Apache-2.0
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package logs
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// This file configures different log formatters via logrus. The
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// standard formatter uses a structured JSON format that is compatible
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// with Stackdriver Error Reporting.
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//
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// https://cloud.google.com/error-reporting/docs/formatting-error-messages
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import (
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"bytes"
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"encoding/json"
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log "github.com/sirupsen/logrus"
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)
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type stackdriverFormatter struct{}
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type serviceContext struct {
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Service string `json:"service"`
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Version string `json:"version"`
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}
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type reportLocation struct {
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FilePath string `json:"filePath"`
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LineNumber int `json:"lineNumber"`
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FunctionName string `json:"functionName"`
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}
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var nixeryContext = serviceContext{
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Service: "nixery",
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}
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// isError determines whether an entry should be logged as an error
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// (i.e. with attached `context`).
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//
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// This requires the caller information to be present on the log
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// entry, as stacktraces are not available currently.
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func isError(e *log.Entry) bool {
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l := e.Level
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return (l == log.ErrorLevel || l == log.FatalLevel || l == log.PanicLevel) &&
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e.HasCaller()
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}
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// logSeverity formats the entry's severity into a format compatible
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// with Stackdriver Logging.
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//
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// The two formats that are being mapped do not have an equivalent set
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// of severities/levels, so the mapping is somewhat arbitrary for a
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// handful of them.
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//
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// https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#LogSeverity
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func logSeverity(l log.Level) string {
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switch l {
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case log.TraceLevel:
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return "DEBUG"
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case log.DebugLevel:
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return "DEBUG"
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case log.InfoLevel:
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return "INFO"
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case log.WarnLevel:
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return "WARNING"
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case log.ErrorLevel:
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return "ERROR"
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case log.FatalLevel:
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return "CRITICAL"
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case log.PanicLevel:
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return "EMERGENCY"
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default:
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return "DEFAULT"
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}
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}
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func (f stackdriverFormatter) Format(e *log.Entry) ([]byte, error) {
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msg := e.Data
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msg["serviceContext"] = &nixeryContext
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msg["message"] = &e.Message
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msg["eventTime"] = &e.Time
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msg["severity"] = logSeverity(e.Level)
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if e, ok := msg[log.ErrorKey]; ok {
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if err, isError := e.(error); isError {
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msg[log.ErrorKey] = err.Error()
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} else {
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delete(msg, log.ErrorKey)
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}
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}
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if isError(e) {
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loc := reportLocation{
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FilePath: e.Caller.File,
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LineNumber: e.Caller.Line,
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FunctionName: e.Caller.Function,
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}
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msg["context"] = &loc
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}
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b := new(bytes.Buffer)
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err := json.NewEncoder(b).Encode(&msg)
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return b.Bytes(), err
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}
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func Init(version string) {
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nixeryContext.Version = version
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log.SetReportCaller(true)
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log.SetFormatter(stackdriverFormatter{})
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}
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