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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package logger
import (
"bufio"
"bytes"
"fmt"
"log"
"sync"
"testing"
"time"
)
func TestFuncWriter(t *testing.T) {
w := FuncWriter(t.Logf)
lg := log.New(w, "prefix: ", 0)
lg.Printf("plumbed through")
}
func TestStdLogger(t *testing.T) {
lg := StdLogger(t.Logf)
lg.Printf("plumbed through")
}
func logTester(want []string, t *testing.T, i *int) Logf {
return func(format string, args ...interface{}) {
got := fmt.Sprintf(format, args...)
if *i >= len(want) {
t.Fatalf("Logging continued past end of expected input: %s", got)
}
if got != want[*i] {
t.Fatalf("\nwanted: %s\n got: %s", want[*i], got)
}
t.Log(got)
*i++
}
}
func TestRateLimiter(t *testing.T) {
want := []string{
"boring string with constant formatting (constant)",
"templated format string no. 0",
"boring string with constant formatting (constant)",
"[RATELIMIT] format(\"boring string with constant formatting %s\")",
"templated format string no. 1",
"[RATELIMIT] format(\"templated format string no. %d\")",
"Make sure this string makes it through the rest (that are blocked) 4",
"4 shouldn't get filtered.",
"hello 1",
"hello 2",
"[RATELIMIT] format(\"hello %v\")",
"[RATELIMIT] format(\"hello %v\") (2 dropped)",
"hello 5",
"hello 6",
"[RATELIMIT] format(\"hello %v\")",
"hello 7",
}
var now time.Time
nowf := func() time.Time { return now }
testsRun := 0
lgtest := logTester(want, t, &testsRun)
lg := RateLimitedFnWithClock(lgtest, 1*time.Minute, 2, 50, nowf)
var prefixed Logf
for i := 0; i < 10; i++ {
lg("boring string with constant formatting %s", "(constant)")
lg("templated format string no. %d", i)
if i == 4 {
lg("Make sure this string makes it through the rest (that are blocked) %d", i)
prefixed = WithPrefix(lg, string(rune('0'+i)))
prefixed(" shouldn't get filtered.")
}
}
lg("hello %v", 1)
lg("hello %v", 2) // printed, but rate limit starts
lg("hello %v", 3) // rate limited (not printed)
now = now.Add(1 * time.Minute)
lg("hello %v", 4) // still limited (not printed)
now = now.Add(1 * time.Minute)
lg("hello %v", 5) // restriction lifted; prints drop count + message
lg("hello %v", 6) // printed, but rate limit starts
now = now.Add(2 * time.Minute)
lg("hello %v", 7) // restriction lifted; no drop count needed
if testsRun < len(want) {
t.Fatalf("Tests after %s weren't logged.", want[testsRun])
}
}
func testTimer(d time.Duration) func() time.Time {
timeNow := time.Now()
return func() time.Time {
timeNow = timeNow.Add(d)
return timeNow
}
}
func TestLogOnChange(t *testing.T) {
want := []string{
"1 2 3 4 5 6",
"1 2 3 4 5 6",
"1 2 3 4 5 7",
"1 2 3 4 5",
"1 2 3 4 5 6 7",
}
timeNow := testTimer(1 * time.Second)
testsRun := 0
lgtest := logTester(want, t, &testsRun)
lg := LogOnChange(lgtest, 5*time.Second, timeNow)
for i := 0; i < 10; i++ {
lg("%s", "1 2 3 4 5 6")
}
lg("1 2 3 4 5 7")
lg("1 2 3 4 5")
lg("1 2 3 4 5")
lg("1 2 3 4 5 6 7")
if testsRun < len(want) {
t.Fatalf("'Wanted' lines including and after [%s] weren't logged.", want[testsRun])
}
}
func TestArgWriter(t *testing.T) {
got := new(bytes.Buffer)
fmt.Fprintf(got, "Greeting: %v", ArgWriter(func(bw *bufio.Writer) {
bw.WriteString("Hello, ")
bw.WriteString("world")
bw.WriteByte('!')
}))
const want = "Greeting: Hello, world!"
if got.String() != want {
t.Errorf("got %q; want %q", got, want)
}
}
func TestSynchronization(t *testing.T) {
timeNow := testTimer(1 * time.Second)
tests := []struct {
name string
logf Logf
}{
{"RateLimitedFn", RateLimitedFn(t.Logf, 1*time.Minute, 2, 50)},
{"LogOnChange", LogOnChange(t.Logf, 5*time.Second, timeNow)},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
var wg sync.WaitGroup
wg.Add(2)
f := func() {
tt.logf("1 2 3 4 5")
wg.Done()
}
go f()
go f()
wg.Wait()
})
}
}
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