Swith to coreos/go-log from ccding/go-logging

bump(github.com/coreos/go-etcd): 57864cf81c66b8605816fafab3ab142e1c5f5b29
bump(github.com/coreos/go-log/log):
bump(github.com/coreos/go-systemd): 52f153170a52158deffce83502a9b6aed3744802

third_party/github.com/coreos/go-etcd/README.md

@@ -2,4 +2,49 @@
 
 golang client library for etcd
 
-This etcd client library is under heavy development. Check back soon for more docs. In the meantime, check out [etcd](https://github.com/coreos/etcd) for details on the client protocol. 
+This etcd client library is under heavy development. Check back soon for more
+docs. In the meantime, check out [etcd](https://github.com/coreos/etcd) for
+details on the client protocol. 
+
+For usage see example below or look at godoc: [go-etcd/etcd](http://godoc.org/github.com/coreos/go-etcd/etcd)
+
+## Install
+
+```bash
+go get github.com/coreos/go-etcd/etcd
+```
+
+## Examples
+
+Returning error values are not showed for the sake of simplicity, but you
+should check them.
+
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/coreos/go-etcd/etcd"
+)
+
+func main() {
+	c := etcd.NewClient() // default binds to http://0.0.0.0:4001
+
+	// SET the value "bar" to the key "foo" with zero TTL
+	// returns a: *store.Response
+	res, _ := c.Set("foo", "bar", 0)
+	fmt.Printf("set response: %+v\n", res)
+
+	// GET the value that is stored for the key "foo"
+	// return a slice: []*store.Response
+	values, _ := c.Get("foo")
+	for i, res := range values { // .. and print them out
+		fmt.Printf("[%d] get response: %+v\n", i, res)
+	}
+
+	// DELETE the key "foo"
+	// returns a: *store.Response
+	res, _ = c.Delete("foo")
+	fmt.Printf("delete response: %+v\n", res)
+}
+```

third_party/github.com/coreos/go-etcd/etcd/client.go

@@ -40,10 +40,9 @@ func NewClient() *Client {
 
 	// default leader and machines
 	cluster := Cluster{
-		Leader:   "http://0.0.0.0:4001",
-		Machines: make([]string, 1),
+		Leader:   "http://127.0.0.1:4001",
+		Machines: []string{"http://127.0.0.1:4001"},
 	}
-	cluster.Machines[0] = "http://0.0.0.0:4001"
 
 	config := Config{
 		// default use http
@@ -117,7 +116,7 @@ func (c *Client) SyncCluster() bool {
 // sync cluster information by providing machine list
 func (c *Client) internalSyncCluster(machines []string) bool {
 	for _, machine := range machines {
-		httpPath := c.createHttpPath(machine, "v1/machines")
+		httpPath := c.createHttpPath(machine, version+"/machines")
 		resp, err := c.httpClient.Get(httpPath)
 		if err != nil {
 			// try another machine in the cluster
@@ -236,11 +235,12 @@ func (c *Client) sendRequest(method string, _path string, body string) (*http.Re
 				// try to connect the leader
 				continue
 			} else if resp.StatusCode == http.StatusInternalServerError {
+				resp.Body.Close()
+
 				retry++
 				if retry > 2*len(c.cluster.Machines) {
 					return nil, errors.New("Cannot reach servers")
 				}
-				resp.Body.Close()
 				continue
 			} else {
 				logger.Debug("send.return.response ", httpPath)

third_party/github.com/coreos/go-etcd/etcd/debug.go

@@ -1,19 +1,27 @@
 package etcd
 
 import (
-	"github.com/ccding/go-logging/logging"
+	"github.com/coreos/go-log/log"
+	"os"
 )
 
-var logger, _ = logging.SimpleLogger("go-etcd")
+var logger *log.Logger
 
 func init() {
-	logger.SetLevel(logging.FATAL)
+	setLogger(log.PriErr)
 }
 
 func OpenDebug() {
-	logger.SetLevel(logging.NOTSET)
+	setLogger(log.PriDebug)
 }
 
 func CloseDebug() {
-	logger.SetLevel(logging.FATAL)
+	setLogger(log.PriErr)
+}
+
+func setLogger(priority log.Priority) {
+	logger = log.NewSimple(
+		log.PriorityFilter(
+			priority,
+			log.WriterSink(os.Stdout, log.BasicFormat, log.BasicFields)))
 }

third_party/github.com/coreos/go-etcd/etcd/version.go

@@ -1,3 +1,3 @@
 package etcd
 
-var version = "v1"
+const version = "v1"

third_party/github.com/coreos/go-log/log/commands.go

@@ -0,0 +1,214 @@
+package log
+// Copyright 2013, David Fisher. All rights reserved.
+//
+// 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.
+//
+// author: David Fisher <ddf1991@gmail.com>
+// based on previous package by: Cong Ding <dinggnu@gmail.com>
+
+import (
+	"fmt"
+	"os"
+)
+
+var BasicFormat = "%s [%9s] %s- %s\n"
+var BasicFields = []string{"time", "priority", "prefix", "message"}
+var RichFormat = "%s [%9s] %d %s - %s:%s:%d - %s\n"
+var RichFields = []string{"full_time", "priority", "seq", "prefix", "filename", "funcname", "lineno", "message"}
+
+// This function has an unusual name to aid in finding it while walking the
+// stack. We need to do some dead reckoning from this function to access the
+// caller's stack, so there is a consistent call depth above this function.
+func (logger *Logger) Log(priority Priority, v ...interface{}) {
+	fields := logger.fieldValues()
+	fields["priority"] = priority
+	fields["message"] = fmt.Sprint(v...)
+	for _, sink := range logger.sinks {
+		sink.Log(fields)
+	}
+}
+
+func (logger *Logger) Logf(priority Priority, format string, v ...interface{}) {
+	logger.Log(priority, fmt.Sprintf(format, v...))
+}
+
+
+func (logger *Logger) Emergency(v ...interface{}) {
+	logger.Log(PriEmerg, v...)
+}
+func (logger *Logger) Emergencyf(format string, v ...interface{}) {
+	logger.Log(PriEmerg, fmt.Sprintf(format, v...))
+}
+
+func (logger *Logger) Alert(v ...interface{}) {
+	logger.Log(PriAlert, v...)
+}
+func (logger *Logger) Alertf(format string, v ...interface{}) {
+	logger.Log(PriAlert, fmt.Sprintf(format, v...))
+}
+
+func (logger *Logger) Critical(v ...interface{}) {
+	logger.Log(PriCrit, v...)
+}
+func (logger *Logger) Criticalf(format string, v ...interface{}) {
+	logger.Log(PriCrit, fmt.Sprintf(format, v...))
+}
+
+func (logger *Logger) Error(v ...interface{}) {
+	logger.Log(PriErr, v...)
+}
+func (logger *Logger) Errorf(format string, v ...interface{}) {
+	logger.Log(PriErr, fmt.Sprintf(format, v...))
+}
+
+func (logger *Logger) Warning(v ...interface{}) {
+	logger.Log(PriWarning, v...)
+}
+func (logger *Logger) Warningf(format string, v ...interface{}) {
+	logger.Log(PriWarning, fmt.Sprintf(format, v...))
+}
+
+func (logger *Logger) Notice(v ...interface{}) {
+	logger.Log(PriNotice, v...)
+}
+func (logger *Logger) Noticef(format string, v ...interface{}) {
+	logger.Log(PriNotice, fmt.Sprintf(format, v...))
+}
+
+func (logger *Logger) Info(v ...interface{}) {
+	logger.Log(PriInfo, v...)
+}
+func (logger *Logger) Infof(format string, v ...interface{}) {
+	logger.Log(PriInfo, fmt.Sprintf(format, v...))
+}
+
+func (logger *Logger) Debug(v ...interface{}) {
+	logger.Log(PriDebug, v...)
+}
+func (logger *Logger) Debugf(format string, v ...interface{}) {
+	logger.Log(PriDebug, fmt.Sprintf(format, v...))
+}
+
+
+func Emergency(v ...interface{}) {
+	defaultLogger.Log(PriEmerg, v...)
+}
+func Emergencyf(format string, v ...interface{}) {
+	defaultLogger.Log(PriEmerg, fmt.Sprintf(format, v...))
+}
+
+func Alert(v ...interface{}) {
+	defaultLogger.Log(PriAlert, v...)
+}
+func Alertf(format string, v ...interface{}) {
+	defaultLogger.Log(PriAlert, fmt.Sprintf(format, v...))
+}
+
+func Critical(v ...interface{}) {
+	defaultLogger.Log(PriCrit, v...)
+}
+func Criticalf(format string, v ...interface{}) {
+	defaultLogger.Log(PriCrit, fmt.Sprintf(format, v...))
+}
+
+func Error(v ...interface{}) {
+	defaultLogger.Log(PriErr, v...)
+}
+func Errorf(format string, v ...interface{}) {
+	defaultLogger.Log(PriErr, fmt.Sprintf(format, v...))
+}
+
+func Warning(v ...interface{}) {
+	defaultLogger.Log(PriWarning, v...)
+}
+func Warningf(format string, v ...interface{}) {
+	defaultLogger.Log(PriWarning, fmt.Sprintf(format, v...))
+}
+
+func Notice(v ...interface{}) {
+	defaultLogger.Log(PriNotice, v...)
+}
+func Noticef(format string, v ...interface{}) {
+	defaultLogger.Log(PriNotice, fmt.Sprintf(format, v...))
+}
+
+func Info(v ...interface{}) {
+	defaultLogger.Log(PriInfo, v...)
+}
+func Infof(format string, v ...interface{}) {
+	defaultLogger.Log(PriInfo, fmt.Sprintf(format, v...))
+}
+
+func Debug(v ...interface{}) {
+	defaultLogger.Log(PriDebug, v...)
+}
+func Debugf(format string, v ...interface{}) {
+	defaultLogger.Log(PriDebug, fmt.Sprintf(format, v...))
+}
+
+// Standard library log functions
+
+func (logger *Logger)Fatalln (v ...interface{}) {
+	logger.Log(PriCrit, v...)
+	os.Exit(1)
+}
+func (logger *Logger)Fatalf (format string, v ...interface{}) {
+	logger.Logf(PriCrit, format, v...)
+	os.Exit(1)
+}
+
+func (logger *Logger)Panicln (v ...interface{}) {
+	s := fmt.Sprint(v...)
+	logger.Log(PriErr, s)
+	panic(s)
+}
+func (logger *Logger)Panicf (format string, v ...interface{}) {
+	s := fmt.Sprintf(format, v...)
+	logger.Log(PriErr, s)
+	panic(s)
+}
+
+func (logger *Logger)Println (v ...interface{}) {
+	logger.Log(PriInfo, v...)
+}
+func (logger *Logger)Printf (format string, v ...interface{}) {
+	logger.Logf(PriInfo, format, v...)
+}
+
+
+func Fatalln (v ...interface{}) {
+	defaultLogger.Log(PriCrit, v...)
+	os.Exit(1)
+}
+func Fatalf (format string, v ...interface{}) {
+	defaultLogger.Logf(PriCrit, format, v...)
+	os.Exit(1)
+}
+
+func Panicln (v ...interface{}) {
+	s := fmt.Sprint(v...)
+	defaultLogger.Log(PriErr, s)
+	panic(s)
+}
+func Panicf (format string, v ...interface{}) {
+	s := fmt.Sprintf(format, v...)
+	defaultLogger.Log(PriErr, s)
+	panic(s)
+}
+
+func Println (v ...interface{}) {
+	defaultLogger.Log(PriInfo, v...)
+}
+func Printf (format string, v ...interface{}) {
+	defaultLogger.Logf(PriInfo, format, v...)
+}

third_party/github.com/coreos/go-log/log/fields.go

@@ -0,0 +1,69 @@
+package log
+// Copyright 2013, David Fisher. All rights reserved.
+//
+// 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.
+//
+// author: David Fisher <ddf1991@gmail.com>
+// based on previous package by: Cong Ding <dinggnu@gmail.com>
+
+import (
+	"os"
+	"path"
+	"runtime"
+	"strings"
+	"sync/atomic"
+	"time"
+)
+
+type Fields map[string]interface{}
+
+func (logger *Logger) fieldValues() Fields {
+	now := time.Now()
+	fields := Fields{
+		"prefix":     logger.prefix,               // static field available to all sinks
+		"seq":        logger.nextSeq(),            // auto-incrementing sequence number
+		"start_time": logger.created,              // start time of the logger
+		"time":       now.Format(time.StampMilli), // formatted time of log entry
+		"full_time":  now,                         // time of log entry
+		"rtime":      time.Since(logger.created),  // relative time of log entry since started
+		"pid":        os.Getpid(),                 // process id
+		"executable": logger.executable,           // executable filename
+	}
+
+	if logger.verbose {
+		setVerboseFields(fields)
+	}
+	return fields
+}
+
+func (logger *Logger) nextSeq() uint64 {
+	return atomic.AddUint64(&logger.seq, 1)
+}
+
+func setVerboseFields(fields Fields) {
+	callers := make([]uintptr, 10)
+	n := runtime.Callers(3, callers) // starts in (*Logger).Log or similar
+	callers = callers[:n]
+
+	for _, pc := range callers {
+		f := runtime.FuncForPC(pc)
+		if !strings.Contains(f.Name(), "logger.(*Logger)") {
+			fields["funcname"] = f.Name()
+			pathname, lineno := f.FileLine(pc)
+			fields["lineno"] = lineno
+			fields["pathname"] = pathname
+			fields["filename"] = path.Base(pathname)
+			return
+		}
+	}
+}

third_party/github.com/coreos/go-log/log/logger.go

@@ -0,0 +1,73 @@
+package log
+
+// Copyright 2013, David Fisher. All rights reserved.
+//
+// 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.
+//
+// author: David Fisher <ddf1991@gmail.com>
+// based on previous package by: Cong Ding <dinggnu@gmail.com>
+
+import (
+	"bitbucket.org/kardianos/osext"
+	"os"
+	"path"
+	"time"
+)
+
+// Logger is user-immutable immutable struct which can log to several outputs
+type Logger struct {
+	sinks   []Sink // the sinks this logger will log to
+	verbose bool   // gather expensive logging data?
+	prefix  string // static field available to all log sinks under this logger
+
+	created    time.Time // time when this logger was created
+	seq        uint64    // sequential number of log message, starting at 1
+	executable string    // executable name
+}
+
+// New creates a new Logger which logs to all the supplied sinks.  The prefix
+// argument is passed to all loggers under the field "prefix" with every log
+// message.  If verbose is true, more expensive runtime fields will be computed
+// and passed to loggers.  These fields are funcname, lineno, pathname, and
+// filename.
+func New(prefix string, verbose bool, sinks ...Sink) *Logger {
+	return &Logger{
+		sinks:   sinks,
+		verbose: verbose,
+		prefix:  prefix,
+
+		created:    time.Now(),
+		seq:        0,
+		executable: getExecutableName(),
+	}
+}
+
+func getExecutableName() string {
+	executablePath, err := osext.Executable()
+	if err != nil {
+		return "(UNKNOWN)"
+	} else {
+		return path.Base(executablePath)
+	}
+}
+
+// NewSimple(sinks...) is equivalent to New("", false, sinks...)
+func NewSimple(sinks ...Sink) *Logger {
+	return New("", false, sinks...)
+}
+
+var defaultLogger *Logger
+
+func init() {
+	defaultLogger = NewSimple(CombinedSink(os.Stdout, BasicFormat, BasicFields))
+}

third_party/github.com/coreos/go-log/log/priority.go

@@ -0,0 +1,54 @@
+package log
+// Copyright 2013, David Fisher. All rights reserved.
+//
+// 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.
+//
+// author: David Fisher <ddf1991@gmail.com>
+// based on previous package by: Cong Ding <dinggnu@gmail.com>
+
+type Priority int
+
+const (
+	PriEmerg Priority = iota
+	PriAlert
+	PriCrit
+	PriErr
+	PriWarning
+	PriNotice
+	PriInfo
+	PriDebug
+)
+
+func (priority Priority) String() string {
+	switch priority {
+	case PriEmerg:
+		return "EMERGENCY"
+	case PriAlert:
+		return "ALERT"
+	case PriCrit:
+		return "CRITICAL"
+	case PriErr:
+		return "ERROR"
+	case PriWarning:
+		return "WARNING"
+	case PriNotice:
+		return "NOTICE"
+	case PriInfo:
+		return "INFO"
+	case PriDebug:
+		return "DEBUG"
+
+	default:
+		return "UNKNOWN"
+	}
+}

third_party/github.com/coreos/go-log/log/sinks.go

@@ -0,0 +1,154 @@
+package log
+
+// Copyright 2013, David Fisher. All rights reserved.
+//
+// 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.
+//
+// author: David Fisher <ddf1991@gmail.com>
+// based on previous package by: Cong Ding <dinggnu@gmail.com>
+
+import (
+	"fmt"
+	"github.com/coreos/go-systemd/journal"
+	"io"
+	"strings"
+	"sync"
+)
+
+const AsyncBuffer = 100
+
+type Sink interface {
+	Log(Fields)
+}
+
+type nullSink struct{}
+
+func (sink *nullSink) Log(fields Fields) {}
+
+func NullSink() Sink {
+	return &nullSink{}
+}
+
+type writerSink struct {
+	lock   sync.Mutex
+	out    io.Writer
+	format string
+	fields []string
+}
+
+func (sink *writerSink) Log(fields Fields) {
+	vals := make([]interface{}, len(sink.fields))
+	for i, field := range sink.fields {
+		var ok bool
+		vals[i], ok = fields[field]
+		if !ok {
+			vals[i] = "???"
+		}
+	}
+
+	sink.lock.Lock()
+	defer sink.lock.Unlock()
+	fmt.Fprintf(sink.out, sink.format, vals...)
+}
+
+func WriterSink(out io.Writer, format string, fields []string) Sink {
+	return &writerSink{
+		out:    out,
+		format: format,
+		fields: fields,
+	}
+}
+
+type journalSink struct{}
+
+func (sink *journalSink) Log(fields Fields) {
+	message := fields["message"].(string)
+	priority := toJournalPriority(fields["priority"].(Priority))
+	journalFields := make(map[string]string)
+	for k, v := range fields {
+		if k == "message" || k == "priority" {
+			continue
+		}
+		journalFields[strings.ToUpper(k)] = fmt.Sprint(v)
+	}
+	journal.Send(message, priority, journalFields)
+}
+
+func toJournalPriority(priority Priority) journal.Priority {
+	switch priority {
+	case PriEmerg:
+		return journal.PriEmerg
+	case PriAlert:
+		return journal.PriAlert
+	case PriCrit:
+		return journal.PriCrit
+	case PriErr:
+		return journal.PriErr
+	case PriWarning:
+		return journal.PriWarning
+	case PriNotice:
+		return journal.PriNotice
+	case PriInfo:
+		return journal.PriInfo
+	case PriDebug:
+		return journal.PriDebug
+
+	default:
+		return journal.PriErr
+	}
+}
+
+func JournalSink() Sink {
+	return &journalSink{}
+}
+
+type combinedSink struct {
+	sinks []Sink
+}
+
+func (sink *combinedSink) Log(fields Fields) {
+	for _, s := range sink.sinks {
+		s.Log(fields)
+	}
+}
+
+func CombinedSink(writer io.Writer, format string, fields []string) Sink {
+	sinks := make([]Sink, 0)
+	sinks = append(sinks, WriterSink(writer, format, fields))
+	if journal.Enabled() {
+		sinks = append(sinks, JournalSink())
+	}
+
+	return &combinedSink{
+		sinks: sinks,
+	}
+}
+
+type priorityFilter struct {
+	priority Priority
+	target   Sink
+}
+
+func (filter *priorityFilter) Log(fields Fields) {
+	// lower priority values indicate more important messages
+	if fields["priority"].(Priority) <= filter.priority {
+		filter.target.Log(fields)
+	}
+}
+
+func PriorityFilter(priority Priority, target Sink) Sink {
+	return &priorityFilter{
+		priority: priority,
+		target:   target,
+	}
+}

third_party/github.com/coreos/go-systemd/LICENSE

@@ -0,0 +1,191 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+"License" shall mean the terms and conditions for use, reproduction, and
+distribution as defined by Sections 1 through 9 of this document.
+
+"Licensor" shall mean the copyright owner or entity authorized by the copyright
+owner that is granting the License.
+
+"Legal Entity" shall mean the union of the acting entity and all other entities
+that control, are controlled by, or are under common control with that entity.
+For the purposes of this definition, "control" means (i) the power, direct or
+indirect, to cause the direction or management of such entity, whether by
+contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the
+outstanding shares, or (iii) beneficial ownership of such entity.
+
+"You" (or "Your") shall mean an individual or Legal Entity exercising
+permissions granted by this License.
+
+"Source" form shall mean the preferred form for making modifications, including
+but not limited to software source code, documentation source, and configuration
+files.
+
+"Object" form shall mean any form resulting from mechanical transformation or
+translation of a Source form, including but not limited to compiled object code,
+generated documentation, and conversions to other media types.
+
+"Work" shall mean the work of authorship, whether in Source or Object form, made
+available under the License, as indicated by a copyright notice that is included
+in or attached to the work (an example is provided in the Appendix below).
+
+"Derivative Works" shall mean any work, whether in Source or Object form, that
+is based on (or derived from) the Work and for which the editorial revisions,
+annotations, elaborations, or other modifications represent, as a whole, an
+original work of authorship. For the purposes of this License, Derivative Works
+shall not include works that remain separable from, or merely link (or bind by
+name) to the interfaces of, the Work and Derivative Works thereof.
+
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third_party/github.com/coreos/go-systemd/README.md

@@ -0,0 +1,3 @@
+# go-systemd
+
+Go bindings to systemd socket activation, journal and D-BUS APIs.

third_party/github.com/coreos/go-systemd/activation/files.go

@@ -0,0 +1,29 @@
+package activation
+
+import (
+	"os"
+	"strconv"
+	"syscall"
+)
+
+// based on: https://gist.github.com/alberts/4640792
+const (
+	listenFdsStart = 3
+)
+
+func Files() []*os.File {
+	pid, err := strconv.Atoi(os.Getenv("LISTEN_PID"))
+	if err != nil || pid != os.Getpid() {
+		return nil
+	}
+	nfds, err := strconv.Atoi(os.Getenv("LISTEN_FDS"))
+	if err != nil || nfds == 0 {
+		return nil
+	}
+	files := []*os.File(nil)
+	for fd := listenFdsStart; fd < listenFdsStart+nfds; fd++ {
+		syscall.CloseOnExec(fd)
+		files = append(files, os.NewFile(uintptr(fd), "LISTEN_FD_" + strconv.Itoa(fd)))
+	}
+	return files
+}

third_party/github.com/coreos/go-systemd/journal/send.go

@@ -0,0 +1,148 @@
+// Package journal provides write bindings to the systemd journal
+package journal
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net"
+	"os"
+	"strconv"
+	"strings"
+	"syscall"
+	"encoding/binary"
+)
+
+// Priority of a journal message
+type Priority int
+
+const (
+	PriEmerg Priority = iota
+	PriAlert
+	PriCrit
+	PriErr
+	PriWarning
+	PriNotice
+	PriInfo
+	PriDebug
+)
+
+var conn net.Conn
+
+func init() {
+	conn, _ = net.Dial("unixgram", "/run/systemd/journal/socket")
+}
+
+// Enabled returns true iff the systemd journal is available for logging
+func Enabled() bool {
+	return conn != nil
+}
+
+// Send a message to the systemd journal. vars is a map of journald fields to
+// values.  Fields must be composed of uppercase letters, numbers, and
+// underscores, but must not start with an underscore. Within these
+// restrictions, any arbitrary field name may be used.  Some names have special
+// significance: see the journalctl documentation
+// (http://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html)
+// for more details.  vars may be nil.
+func Send(message string, priority Priority, vars map[string]string) error {
+	if conn == nil {
+		return journalError("could not connect to journald socket")
+	}
+
+	data := new(bytes.Buffer)
+	appendVariable(data, "PRIORITY", strconv.Itoa(int(priority)))
+	appendVariable(data, "MESSAGE", message)
+	for k, v := range vars {
+		appendVariable(data, k, v)
+	}
+
+	_, err := io.Copy(conn, data)
+	if err != nil && isSocketSpaceError(err) {
+		file, err := tempFd()
+		if err != nil {
+			return journalError(err.Error())
+		}
+		_, err = io.Copy(file, data)
+		if err != nil {
+			return journalError(err.Error())
+		}
+
+		rights := syscall.UnixRights(int(file.Fd()))
+
+		/* this connection should always be a UnixConn, but better safe than sorry */
+		unixConn, ok := conn.(*net.UnixConn)
+		if !ok {
+			return journalError("can't send file through non-Unix connection")
+		}
+		unixConn.WriteMsgUnix([]byte{}, rights, nil)
+	} else if err != nil {
+		return journalError(err.Error())
+	}
+	return nil
+}
+
+func appendVariable(w io.Writer, name, value string) {
+	if !validVarName(name) {
+		journalError("variable name contains invalid character, ignoring")
+	}
+	if strings.ContainsRune(value, '\n') {
+		/* When the value contains a newline, we write:
+		 * - the variable name, followed by a newline
+		 * - the size (in 64bit little endian format)
+		 * - the data, followed by a newline
+		 */
+		fmt.Fprintln(w, name)
+		binary.Write(w, binary.LittleEndian, uint64(len(value)))
+		fmt.Fprintln(w, value)
+	} else {
+		/* just write the variable and value all on one line */
+		fmt.Fprintf(w, "%s=%s\n", name, value)
+	}
+}
+
+func validVarName(name string) bool {
+	/* The variable name must be in uppercase and consist only of characters,
+	 * numbers and underscores, and may not begin with an underscore. (from the docs)
+	 */
+	valid := true
+	valid = valid && name[0] != '_'
+	for _, c := range name {
+		valid = valid && ('A' <= c && c <= 'Z') || ('0' <= c && c <= '9') || c == '_'
+	}
+	return valid
+}
+
+func isSocketSpaceError(err error) bool {
+	opErr, ok := err.(*net.OpError)
+	if !ok {
+		return false
+	}
+
+	sysErr, ok := opErr.Err.(syscall.Errno)
+	if !ok {
+		return false
+	}
+
+	return sysErr == syscall.EMSGSIZE || sysErr == syscall.ENOBUFS
+}
+
+func tempFd() (*os.File, error) {
+	file, err := ioutil.TempFile("/dev/shm/", "journal.XXXXX")
+	if err != nil {
+		return nil, err
+	}
+	syscall.Unlink(file.Name())
+	if err != nil {
+		return nil, err
+	}
+	return file, nil
+}
+
+func journalError(s string) error {
+	s = "journal error: " + s
+	fmt.Fprintln(os.Stderr, s)
+	return errors.New(s)
+}