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logger.go
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logger.go
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package middleware
import (
"bytes"
"log"
"time"
"github.com/emicklei/go-restful"
)
// 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.
//
// Logger has been designed explicitly to be Good Enough for use in small
// applications and for people just getting started with Goji. It is expected
// that applications will eventually outgrow this middleware and replace it with
// a custom request logger, such as one that produces machine-parseable output,
// outputs logs to a different service (e.g., syslog), or formats lines like
// those printed elsewhere in the application.
func Logger(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
reqID := GetReqID(req)
printStart(reqID, req)
t1 := time.Now()
chain.ProcessFilter(req, resp)
t2 := time.Now()
printEnd(reqID, resp, t2.Sub(t1))
}
func printStart(reqID string, req *restful.Request) {
var buf bytes.Buffer
if reqID != "" {
cW(&buf, bBlack, "[%s] ", reqID)
}
buf.WriteString("Started ")
cW(&buf, bMagenta, "%s ", req.Request.Method)
cW(&buf, nBlue, "%q ", req.Request.URL.String())
buf.WriteString("from ")
buf.WriteString(req.Request.RemoteAddr)
log.Print(buf.String())
}
func printEnd(reqID string, resp *restful.Response, dt time.Duration) {
var buf bytes.Buffer
if reqID != "" {
cW(&buf, bBlack, "[%s] ", reqID)
}
buf.WriteString("Returning ")
status := resp.StatusCode()
if status < 200 {
cW(&buf, bBlue, "%03d", status)
} else if status < 300 {
cW(&buf, bGreen, "%03d", status)
} else if status < 400 {
cW(&buf, bCyan, "%03d", status)
} else if status < 500 {
cW(&buf, bYellow, "%03d", status)
} else {
cW(&buf, bRed, "%03d", status)
}
buf.WriteString(" in ")
if dt < 500*time.Millisecond {
cW(&buf, nGreen, "%s", dt)
} else if dt < 5*time.Second {
cW(&buf, nYellow, "%s", dt)
} else {
cW(&buf, nRed, "%s", dt)
}
log.Print(buf.String())
}