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https://github.com/tailscale/tailscale.git
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59026a291d
Prior to wireguard-go using printf-style logging, all wireguard-go logging occurred using format string "%s". We fixed that but continued to use %s when we rewrote peer identifiers into Tailscale style. This commit removes that %sl, which makes rate limiting work correctly. As a happy side-benefit, it should generate less garbage. Instead of replacing all wireguard-go peer identifiers that might occur anywhere in a fully formatted log string, assume that they only come from args. Check all args for things that look like *device.Peers and replace them with appropriately reformatted strings. There is a variety of ways that this could go wrong (unusual format verbs or modifiers, peer identifiers occurring as part of a larger printed object, future API changes), but none of them occur now, are likely to be added, or would be hard to work around if they did. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
73 lines
1.7 KiB
Go
73 lines
1.7 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 wglog_test
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import (
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"fmt"
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"testing"
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"tailscale.com/types/wgkey"
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"tailscale.com/wgengine/wgcfg"
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"tailscale.com/wgengine/wglog"
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)
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func TestLogger(t *testing.T) {
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tests := []struct {
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format string
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args []interface{}
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want string
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omit bool
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}{
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{"hi", nil, "hi", false},
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{"Routine: starting", nil, "", true},
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{"%v says it misses you", []interface{}{stringer("peer(IMTB…r7lM)")}, "[IMTBr] says it misses you", false},
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}
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type log struct {
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format string
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args []interface{}
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}
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c := make(chan log, 1)
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logf := func(format string, args ...interface{}) {
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select {
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case c <- log{format, args}:
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default:
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t.Errorf("wrote %q, but shouldn't have", fmt.Sprintf(format, args...))
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}
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}
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x := wglog.NewLogger(logf)
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key, err := wgkey.ParseHex("20c4c1ae54e1fd37cab6e9a532ca20646aff496796cc41d4519560e5e82bee53")
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if err != nil {
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t.Fatal(err)
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}
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x.SetPeers([]wgcfg.Peer{{PublicKey: key}})
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for _, tt := range tests {
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if tt.omit {
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// Write a message ourselves into the channel.
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// Then if logf also attempts to write into the channel, it'll fail.
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c <- log{}
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}
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x.DeviceLogger.Errorf(tt.format, tt.args...)
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gotLog := <-c
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if tt.omit {
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continue
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}
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if got := fmt.Sprintf(gotLog.format, gotLog.args...); got != tt.want {
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t.Errorf("Printf(%q, %v) = %q want %q", tt.format, tt.args, got, tt.want)
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}
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}
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}
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func stringer(s string) stringerString {
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return stringerString(s)
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}
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type stringerString string
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func (s stringerString) String() string { return string(s) }
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