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http_test.go
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http_test.go
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package crzerolog
import (
"bytes"
"encoding/json"
"net/http"
"net/http/httptest"
"testing"
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
)
type logEntry struct {
Time string `json:"time"`
Severity string `json:"severity"`
SourceLocation sourceLocation `json:"logging.googleapis.com/sourceLocation"`
Trace string `json:"logging.googleapis.com/trace"`
Message string `json:"message"`
}
type sourceLocation struct {
File string `json:"file"`
Line string `json:"line"`
Function string `json:"function"`
}
func TestInjectLogger(t *testing.T) {
tests := []struct {
desc string
requestFunc func() *http.Request
handler http.Handler
want logEntry
}{
{
desc: "With X-Cloud-Trace-Context",
requestFunc: func() *http.Request {
req, err := http.NewRequest("GET", "/", nil)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
req.Header.Add("X-Cloud-Trace-Context", "0123456789abcdef0123456789abcdef/123;o=1")
return req
},
handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
logger := log.Ctx(r.Context())
logger.Info().Msg("hello")
}),
want: logEntry{
Time: "ignore",
Severity: "INFO",
SourceLocation: sourceLocation{
File: "http_test.go",
Line: "ignore",
Function: "ignore",
},
Trace: "projects/myproject/traces/0123456789abcdef0123456789abcdef",
Message: "hello",
},
},
{
desc: "Without X-Cloud-Trace-Context",
requestFunc: func() *http.Request {
req, err := http.NewRequest("GET", "/", nil)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
return req
},
handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
logger := log.Ctx(r.Context())
logger.Debug().Msg("hi") // Debug log is ignored
logger.Info().Msg("hello")
}),
want: logEntry{
Time: "ignore",
Severity: "INFO",
SourceLocation: sourceLocation{
File: "http_test.go",
Line: "ignore",
Function: "ignore",
},
Trace: "",
Message: "hello",
},
},
}
for _, tt := range tests {
projectID = "myproject"
buf := &bytes.Buffer{}
rootLogger := zerolog.New(buf)
zerolog.SetGlobalLevel(zerolog.InfoLevel)
resprec := httptest.NewRecorder()
InjectLogger(&rootLogger)(tt.handler).ServeHTTP(resprec, tt.requestFunc())
var got logEntry
if err := json.Unmarshal(buf.Bytes(), &got); err != nil {
t.Fatalf("Unexpected error: %v", err)
}
opt := cmpopts.IgnoreFields(logEntry{}, "Time", "SourceLocation.Line", "SourceLocation.Function")
if diff := cmp.Diff(tt.want, got, opt); diff != "" {
t.Errorf("%s: Log output diff: %s", tt.desc, diff)
}
}
}