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caddy/caddyhttp/httpserver/logger.go at master · wilesun/caddy · GitHub
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caddy
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caddyhttp
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httpserver
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logger.go
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caddy
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caddyhttp
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httpserver
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logger.go
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// Copyright 2015 Light Code Labs, LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package
httpserver
import
(
"bytes"
"io"
"log"
"os"
"strings"
"sync"
"github.com/hashicorp/go-syslog"
"github.com/mholt/caddy"
)
var
remoteSyslogPrefixes
=
map
[
string
]
string
{
"syslog+tcp://"
:
"tcp"
,
"syslog+udp://"
:
"udp"
,
"syslog://"
:
"udp"
,
}
// Logger is shared between errors and log plugins and supports both logging to
// a file (with an optional file roller), local and remote syslog servers.
type
Logger
struct
{
Output
string
*
log.
Logger
Roller
*
LogRoller
writer
io.
Writer
fileMu
*
sync.
RWMutex
}
// NewTestLogger creates logger suitable for testing purposes
func
NewTestLogger
(
buffer
*
bytes.
Buffer
)
*
Logger
{
return
&
Logger
{
Logger
:
log
.
New
(
buffer
,
""
,
0
),
fileMu
:
new
(sync.
RWMutex
),
}
}
// Println wraps underlying logger with mutex
func
(
l
Logger
)
Println
(
args
...
interface
{}) {
l
.
fileMu
.
RLock
()
l
.
Logger
.
Println
(
args
...
)
l
.
fileMu
.
RUnlock
()
}
// Printf wraps underlying logger with mutex
func
(
l
Logger
)
Printf
(
format
string
,
args
...
interface
{}) {
l
.
fileMu
.
RLock
()
l
.
Logger
.
Printf
(
format
,
args
...
)
l
.
fileMu
.
RUnlock
()
}
// Attach binds logger Start and Close functions to
// controller's OnStartup and OnShutdown hooks.
func
(
l
*
Logger
)
Attach
(
controller
*
caddy.
Controller
) {
if
controller
!=
nil
{
// Opens file or connect to local/remote syslog
controller
.
OnStartup
(
l
.
Start
)
// Closes file or disconnects from local/remote syslog
controller
.
OnShutdown
(
l
.
Close
)
}
}
type
syslogAddress
struct
{
network
string
address
string
}
func
parseSyslogAddress
(
location
string
)
*
syslogAddress
{
for
prefix
,
network
:=
range
remoteSyslogPrefixes
{
if
strings
.
HasPrefix
(
location
,
prefix
) {
return
&
syslogAddress
{
network
:
network
,
address
:
strings
.
TrimPrefix
(
location
,
prefix
),
}
}
}
return
nil
}
// Start initializes logger opening files or local/remote syslog connections
func
(
l
*
Logger
)
Start
()
error
{
// initialize mutex on start
l
.
fileMu
=
new
(sync.
RWMutex
)
var
err
error
selectwriter:
switch
l
.
Output
{
case
""
,
"stderr"
:
l
.
writer
=
os
.
Stderr
case
"stdout"
:
l
.
writer
=
os
.
Stdout
case
"syslog"
:
l
.
writer
,
err
=
gsyslog
.
NewLogger
(
gsyslog
.
LOG_ERR
,
"LOCAL0"
,
"caddy"
)
if
err
!=
nil
{
return
err
}
default
:
if
address
:=
parseSyslogAddress
(
l
.
Output
);
address
!=
nil
{
l
.
writer
,
err
=
gsyslog
.
DialLogger
(
address
.
network
,
address
.
address
,
gsyslog
.
LOG_ERR
,
"LOCAL0"
,
"caddy"
)
if
err
!=
nil
{
return
err
}
break
selectwriter
}
var
file
*
os.
File
file
,
err
=
os
.
OpenFile
(
l
.
Output
,
os
.
O_RDWR
|
os
.
O_CREATE
|
os
.
O_APPEND
,
0644
)
if
err
!=
nil
{
return
err
}
if
l
.
Roller
!=
nil
{
file
.
Close
()
l
.
Roller
.
Filename
=
l
.
Output
l
.
writer
=
l
.
Roller
.
GetLogWriter
()
}
else
{
l
.
writer
=
file
}
}
l
.
Logger
=
log
.
New
(
l
.
writer
,
""
,
0
)
return
nil
}
// Close closes open log files or connections to syslog.
func
(
l
*
Logger
)
Close
()
error
{
// don't close stdout or stderr
if
l
.
writer
==
os
.
Stdout
||
l
.
writer
==
os
.
Stderr
{
return
nil
}
// Will close local/remote syslog connections too :)
if
closer
,
ok
:=
l
.
writer
.(io.
WriteCloser
);
ok
{
l
.
fileMu
.
Lock
()
err
:=
closer
.
Close
()
l
.
fileMu
.
Unlock
()
return
err
}
return
nil
}
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