peridot/vendor/github.com/go-chi/chi/middleware/logger.go
2022-07-07 22:13:21 +02:00

156 lines
4.4 KiB
Go

package middleware
import (
"bytes"
"context"
"log"
"net/http"
"os"
"time"
)
var (
// LogEntryCtxKey is the context.Context key to store the request log entry.
LogEntryCtxKey = &contextKey{"LogEntry"}
// DefaultLogger is called by the Logger middleware handler to log each request.
// Its made a package-level variable so that it can be reconfigured for custom
// logging configurations.
DefaultLogger = RequestLogger(&DefaultLogFormatter{Logger: log.New(os.Stdout, "", log.LstdFlags), NoColor: false})
)
// Logger is a middleware that logs the start and end of each request, along
// with some useful data about what was requested, what the response status was,
// and how long it took to return. When standard output is a TTY, Logger will
// print in color, otherwise it will print in black and white. Logger prints a
// request ID if one is provided.
//
// Alternatively, look at https://github.com/goware/httplog for a more in-depth
// http logger with structured logging support.
func Logger(next http.Handler) http.Handler {
return DefaultLogger(next)
}
// RequestLogger returns a logger handler using a custom LogFormatter.
func RequestLogger(f LogFormatter) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
entry := f.NewLogEntry(r)
ww := NewWrapResponseWriter(w, r.ProtoMajor)
t1 := time.Now()
defer func() {
entry.Write(ww.Status(), ww.BytesWritten(), ww.Header(), time.Since(t1), nil)
}()
next.ServeHTTP(ww, WithLogEntry(r, entry))
}
return http.HandlerFunc(fn)
}
}
// LogFormatter initiates the beginning of a new LogEntry per request.
// See DefaultLogFormatter for an example implementation.
type LogFormatter interface {
NewLogEntry(r *http.Request) LogEntry
}
// LogEntry records the final log when a request completes.
// See defaultLogEntry for an example implementation.
type LogEntry interface {
Write(status, bytes int, header http.Header, elapsed time.Duration, extra interface{})
Panic(v interface{}, stack []byte)
}
// GetLogEntry returns the in-context LogEntry for a request.
func GetLogEntry(r *http.Request) LogEntry {
entry, _ := r.Context().Value(LogEntryCtxKey).(LogEntry)
return entry
}
// WithLogEntry sets the in-context LogEntry for a request.
func WithLogEntry(r *http.Request, entry LogEntry) *http.Request {
r = r.WithContext(context.WithValue(r.Context(), LogEntryCtxKey, entry))
return r
}
// LoggerInterface accepts printing to stdlib logger or compatible logger.
type LoggerInterface interface {
Print(v ...interface{})
}
// DefaultLogFormatter is a simple logger that implements a LogFormatter.
type DefaultLogFormatter struct {
Logger LoggerInterface
NoColor bool
}
// NewLogEntry creates a new LogEntry for the request.
func (l *DefaultLogFormatter) NewLogEntry(r *http.Request) LogEntry {
useColor := !l.NoColor
entry := &defaultLogEntry{
DefaultLogFormatter: l,
request: r,
buf: &bytes.Buffer{},
useColor: useColor,
}
reqID := GetReqID(r.Context())
if reqID != "" {
cW(entry.buf, useColor, nYellow, "[%s] ", reqID)
}
cW(entry.buf, useColor, nCyan, "\"")
cW(entry.buf, useColor, bMagenta, "%s ", r.Method)
scheme := "http"
if r.TLS != nil {
scheme = "https"
}
cW(entry.buf, useColor, nCyan, "%s://%s%s %s\" ", scheme, r.Host, r.RequestURI, r.Proto)
entry.buf.WriteString("from ")
entry.buf.WriteString(r.RemoteAddr)
entry.buf.WriteString(" - ")
return entry
}
type defaultLogEntry struct {
*DefaultLogFormatter
request *http.Request
buf *bytes.Buffer
useColor bool
}
func (l *defaultLogEntry) Write(status, bytes int, header http.Header, elapsed time.Duration, extra interface{}) {
switch {
case status < 200:
cW(l.buf, l.useColor, bBlue, "%03d", status)
case status < 300:
cW(l.buf, l.useColor, bGreen, "%03d", status)
case status < 400:
cW(l.buf, l.useColor, bCyan, "%03d", status)
case status < 500:
cW(l.buf, l.useColor, bYellow, "%03d", status)
default:
cW(l.buf, l.useColor, bRed, "%03d", status)
}
cW(l.buf, l.useColor, bBlue, " %dB", bytes)
l.buf.WriteString(" in ")
if elapsed < 500*time.Millisecond {
cW(l.buf, l.useColor, nGreen, "%s", elapsed)
} else if elapsed < 5*time.Second {
cW(l.buf, l.useColor, nYellow, "%s", elapsed)
} else {
cW(l.buf, l.useColor, nRed, "%s", elapsed)
}
l.Logger.Print(l.buf.String())
}
func (l *defaultLogEntry) Panic(v interface{}, stack []byte) {
PrintPrettyStack(v)
}