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accesslog_test.go
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package accesslog
import (
"fmt"
"net/http"
"net/http/httptest"
"sort"
"strings"
"testing"
)
type customLogger struct {
buf string
}
func (l *customLogger) Log(record LogRecord) {
fields := make([]string, 0)
fields = append(fields, "method:"+record.Method)
fields = append(fields, "uri:"+record.Uri)
fields = append(fields, "protocol:"+record.Protocol)
fields = append(fields, "username:"+record.Username)
fields = append(fields, "host:"+record.Host)
fields = append(fields, "status:"+fmt.Sprintf("%d", record.Status))
// Sort the custom records to get a deterministic test result
keys := []string{}
for k, _ := range record.CustomRecords {
keys = append(keys, k)
}
sort.Strings(keys)
customRecords := []string{}
for _, key := range keys {
customRecords = append(customRecords, fmt.Sprintf("%s:%s", key, record.CustomRecords[key]))
}
fields = append(fields, "customRecords:"+fmt.Sprintf("map%v", customRecords))
l.buf += strings.Join(fields, ",")
l.buf += "\n"
}
func okHandler(w http.ResponseWriter, req *http.Request) {
w.(*LoggingWriter).SetCustomLogRecord("x-user-id", "1")
w.Write([]byte(`ok`))
}
func newRequest(method, url string) *http.Request {
req, err := http.NewRequest(method, url, nil)
if err != nil {
panic(err)
}
req.Host = "example.com"
return req
}
func TestOutput(t *testing.T) {
logger := customLogger{}
loggingHandler := NewLoggingHandler(http.HandlerFunc(okHandler), &logger)
writer := httptest.NewRecorder()
loggingHandler.ServeHTTP(writer, newRequest("GET", "/"))
expected := "method:GET,uri:,protocol:HTTP/1.1,username:-,host:example.com,status:200,customRecords:map[x-user-id:1]\n"
output := logger.buf
if output != expected {
t.Errorf("expected %s but got %s", expected, output)
}
}
func TestAroundOutput(t *testing.T) {
logger := customLogger{}
loggingHandler := NewAroundLoggingHandler(http.HandlerFunc(okHandler), &logger)
writer := httptest.NewRecorder()
loggingHandler.ServeHTTP(writer, newRequest("GET", "/"))
expected := "method:GET,uri:,protocol:HTTP/1.1,username:-,host:example.com,status:0,customRecords:map[at:before]\n" +
"method:GET,uri:,protocol:HTTP/1.1,username:-,host:example.com,status:200,customRecords:map[at:after x-user-id:1]\n"
output := logger.buf
if output != expected {
t.Errorf("expected\n%s\nbut got\n%s", expected, output)
}
}
func okContextHandler(w http.ResponseWriter, req *http.Request) {
logger := GetLoggingWriter(req.Context())
logger.SetCustomLogRecord("x-user-id", "1")
w.Write([]byte(`ok`))
}
func TestSetCustomLogRecord_context(t *testing.T) {
logger := customLogger{}
loggingHandler := NewAroundLoggingHandler(http.HandlerFunc(okContextHandler), &logger)
writer := httptest.NewRecorder()
loggingHandler.ServeHTTP(writer, newRequest("GET", "/"))
expected := "method:GET,uri:,protocol:HTTP/1.1,username:-,host:example.com,status:0,customRecords:map[at:before]\n" +
"method:GET,uri:,protocol:HTTP/1.1,username:-,host:example.com,status:200,customRecords:map[at:after x-user-id:1]\n"
output := logger.buf
if output != expected {
t.Errorf("expected\n%s\nbut got\n%s", expected, output)
}
}
func okWrappedHandler(w http.ResponseWriter, req *http.Request) {
logger, ok := GetResponseWriter(w, func(rw http.ResponseWriter) bool {
_, ok := rw.(*LoggingWriter)
return ok
})
if ok {
logger.(*LoggingWriter).SetCustomLogRecord("x-user-id", "1")
}
w.Write([]byte(`ok`))
}
func TestSetCustomLogRecord_wrapped(t *testing.T) {
logger := customLogger{}
loggingHandler := NewAroundLoggingHandler(http.HandlerFunc(okWrappedHandler), &logger)
writer := httptest.NewRecorder()
loggingHandler.ServeHTTP(writer, newRequest("GET", "/"))
expected := "method:GET,uri:,protocol:HTTP/1.1,username:-,host:example.com,status:0,customRecords:map[at:before]\n" +
"method:GET,uri:,protocol:HTTP/1.1,username:-,host:example.com,status:200,customRecords:map[at:after x-user-id:1]\n"
output := logger.buf
if output != expected {
t.Errorf("expected\n%s\nbut got\n%s", expected, output)
}
}
func TestLoggingWriter(t *testing.T) {
w := &LoggingWriter{
ResponseWriter: nil,
logRecord: LogRecord{},
}
w.SetCustomLogRecord("x-user-id", "1")
if e,g:="1",w.GetCustomLogRecord("x-user-id");e!=g {
t.Errorf("unexpected GetCustomLogRecord, expected=%v, got=%v",e,g)
}
if e,g:="",w.GetCustomLogRecord("hoge");e!=g {
t.Errorf("unexpected GetCustomLogRecord, expected=%v, got=%v",e,g)
}
}
type WrapWriter interface {
http.ResponseWriter
WrappedWriter() http.ResponseWriter
}
// Helper function to retrieve a specific ResponseWriter.
func GetResponseWriter(w http.ResponseWriter,
predicate func(http.ResponseWriter) bool) (http.ResponseWriter, bool) {
for {
// Check if this writer is the one we're looking for
if w != nil && predicate(w) {
return w, true
}
// If it is a WrapWriter, move back the chain of wrapped writers
ww, ok := w.(WrapWriter)
if !ok {
return nil, false
}
w = ww.WrappedWriter()
}
}