mirror of
https://github.com/tailscale/tailscale.git
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329 lines
6.9 KiB
Go
329 lines
6.9 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package logtail
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import (
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"context"
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"encoding/json"
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"io"
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"io/ioutil"
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"net/http"
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"net/http/httptest"
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"strings"
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"testing"
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"time"
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)
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func TestFastShutdown(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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cancel()
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testServ := httptest.NewServer(http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {}))
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defer testServ.Close()
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l := NewLogger(Config{
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BaseURL: testServ.URL,
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}, t.Logf)
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err := l.Shutdown(ctx)
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if err != nil {
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t.Error(err)
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}
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}
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// maximum number of times a test will call l.Write()
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const logLines = 3
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type LogtailTestServer struct {
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srv *httptest.Server // Log server
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uploaded chan []byte
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}
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func NewLogtailTestHarness(t *testing.T) (*LogtailTestServer, *Logger) {
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ts := LogtailTestServer{}
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// max channel backlog = 1 "started" + #logLines x "log line" + 1 "closed"
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ts.uploaded = make(chan []byte, 2+logLines)
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ts.srv = httptest.NewServer(http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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body, err := ioutil.ReadAll(r.Body)
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if err != nil {
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t.Error("failed to read HTTP request")
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}
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ts.uploaded <- body
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}))
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t.Cleanup(ts.srv.Close)
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l := NewLogger(Config{BaseURL: ts.srv.URL}, t.Logf)
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// There is always an initial "logtail started" message
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body := <-ts.uploaded
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if !strings.Contains(string(body), "started") {
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t.Errorf("unknown start logging statement: %q", string(body))
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}
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return &ts, l
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}
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func TestDrainPendingMessages(t *testing.T) {
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ts, l := NewLogtailTestHarness(t)
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for i := 0; i < logLines; i++ {
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l.Write([]byte("log line"))
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}
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// all of the "log line" messages usually arrive at once, but poll if needed.
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body := ""
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for i := 0; i <= logLines; i++ {
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body += string(<-ts.uploaded)
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count := strings.Count(body, "log line")
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if count == logLines {
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break
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}
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// if we never find count == logLines, the test will eventually time out.
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}
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err := l.Shutdown(context.Background())
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if err != nil {
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t.Error(err)
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}
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}
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func TestEncodeAndUploadMessages(t *testing.T) {
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ts, l := NewLogtailTestHarness(t)
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tests := []struct {
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name string
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log string
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want string
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}{
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{
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"plain text",
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"log line",
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"log line",
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},
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{
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"simple JSON",
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`{"text": "log line"}`,
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"log line",
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},
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}
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for _, tt := range tests {
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io.WriteString(l, tt.log)
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body := <-ts.uploaded
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data := make(map[string]interface{})
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err := json.Unmarshal(body, &data)
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if err != nil {
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t.Error(err)
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}
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got := data["text"]
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if got != tt.want {
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t.Errorf("%s: got %q; want %q", tt.name, got.(string), tt.want)
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}
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ltail, ok := data["logtail"]
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if ok {
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logtailmap := ltail.(map[string]interface{})
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_, ok = logtailmap["client_time"]
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if !ok {
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t.Errorf("%s: no client_time present", tt.name)
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}
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} else {
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t.Errorf("%s: no logtail map present", tt.name)
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}
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}
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err := l.Shutdown(context.Background())
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if err != nil {
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t.Error(err)
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}
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}
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func TestEncodeSpecialCases(t *testing.T) {
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ts, l := NewLogtailTestHarness(t)
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// -------------------------------------------------------------------------
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// JSON log message already contains a logtail field.
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io.WriteString(l, `{"logtail": "LOGTAIL", "text": "text"}`)
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body := <-ts.uploaded
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data := make(map[string]interface{})
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err := json.Unmarshal(body, &data)
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if err != nil {
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t.Error(err)
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}
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errorHasLogtail, ok := data["error_has_logtail"]
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if ok {
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if errorHasLogtail != "LOGTAIL" {
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t.Errorf("error_has_logtail: got:%q; want:%q",
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errorHasLogtail, "LOGTAIL")
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}
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} else {
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t.Errorf("no error_has_logtail field: %v", data)
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}
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// -------------------------------------------------------------------------
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// special characters
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io.WriteString(l, "\b\f\n\r\t"+`"\`)
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bodytext := string(<-ts.uploaded)
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// json.Unmarshal would unescape the characters, we have to look at the encoded text
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escaped := strings.Contains(bodytext, `\b\f\n\r\t\"\`)
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if !escaped {
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t.Errorf("special characters got %s", bodytext)
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}
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// -------------------------------------------------------------------------
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// skipClientTime to omit the logtail metadata
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l.skipClientTime = true
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io.WriteString(l, "text")
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body = <-ts.uploaded
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data = make(map[string]interface{})
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err = json.Unmarshal(body, &data)
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if err != nil {
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t.Error(err)
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}
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_, ok = data["logtail"]
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if ok {
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t.Errorf("skipClientTime: unexpected logtail map present: %v", data)
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}
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// -------------------------------------------------------------------------
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// lowMem + long string
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l.skipClientTime = false
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l.lowMem = true
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longStr := strings.Repeat("0", 512)
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io.WriteString(l, longStr)
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body = <-ts.uploaded
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data = make(map[string]interface{})
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err = json.Unmarshal(body, &data)
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if err != nil {
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t.Error(err)
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}
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text, ok := data["text"]
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if !ok {
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t.Errorf("lowMem: no text %v", data)
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}
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if n := len(text.(string)); n > 300 {
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t.Errorf("lowMem: got %d chars; want <300 chars", n)
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}
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// -------------------------------------------------------------------------
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err = l.Shutdown(context.Background())
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if err != nil {
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t.Error(err)
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}
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}
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var sink []byte
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func TestLoggerEncodeTextAllocs(t *testing.T) {
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lg := &Logger{timeNow: time.Now}
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inBuf := []byte("some text to encode")
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n := testing.AllocsPerRun(1000, func() {
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sink = lg.encodeText(inBuf, false)
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})
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if int(n) != 1 {
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t.Logf("allocs = %d; want 1", int(n))
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}
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}
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func TestLoggerWriteLength(t *testing.T) {
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lg := &Logger{
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timeNow: time.Now,
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buffer: NewMemoryBuffer(1024),
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}
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inBuf := []byte("some text to encode")
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n, err := lg.Write(inBuf)
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if err != nil {
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t.Error(err)
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}
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if n != len(inBuf) {
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t.Errorf("logger.Write wrote %d bytes, expected %d", n, len(inBuf))
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}
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}
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func TestParseAndRemoveLogLevel(t *testing.T) {
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tests := []struct {
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log string
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wantLevel int
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wantLog string
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}{
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{
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"no level",
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0,
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"no level",
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},
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{
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"[v1] level 1",
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1,
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"level 1",
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},
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{
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"level 1 [v1] ",
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1,
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"level 1 ",
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},
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{
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"[v2] level 2",
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2,
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"level 2",
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},
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{
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"level [v2] 2",
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2,
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"level 2",
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},
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{
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"[v3] no level 3",
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0,
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"[v3] no level 3",
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},
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}
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for _, tt := range tests {
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gotLevel, gotLog := parseAndRemoveLogLevel([]byte(tt.log))
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if gotLevel != tt.wantLevel {
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t.Errorf("parseAndRemoveLogLevel(%q): got:%d; want %d",
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tt.log, gotLevel, tt.wantLevel)
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}
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if string(gotLog) != tt.wantLog {
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t.Errorf("parseAndRemoveLogLevel(%q): got:%q; want %q",
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tt.log, gotLog, tt.wantLog)
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}
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}
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}
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func TestPublicIDUnmarshalText(t *testing.T) {
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const hexStr = "6c60a9e0e7af57170bb1347b2d477e4cbc27d4571a4923b21651456f931e3d55"
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x := []byte(hexStr)
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var id PublicID
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if err := id.UnmarshalText(x); err != nil {
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t.Fatal(err)
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}
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if id.String() != hexStr {
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t.Errorf("String = %q; want %q", id.String(), hexStr)
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}
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n := int(testing.AllocsPerRun(1000, func() {
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var id PublicID
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if err := id.UnmarshalText(x); err != nil {
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t.Fatal(err)
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}
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}))
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if n != 0 {
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t.Errorf("allocs = %v; want 0", n)
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}
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}
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