feature: init syslog functionality in pouchd

apis/opts/log_options.go

@@ -0,0 +1,36 @@
+package opts
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+)
+
+// ParseLogOptions parses [key=value] slice-type log options into map.
+func ParseLogOptions(driver string, logOpts []string) (map[string]string, error) {
+	opts, err := convertKVStringsToMap(logOpts)
+	if err != nil {
+		return nil, err
+	}
+
+	if driver == "none" && len(opts) > 0 {
+		return nil, fmt.Errorf("don't allow to set logging opts for driver %s", driver)
+	}
+	return opts, nil
+}
+
+// convertKVStringsToMap converts ["key=value"] into {"key":"value"}
+//
+// TODO(fuwei): make it common in the opts.ParseXXX().
+func convertKVStringsToMap(values []string) (map[string]string, error) {
+	kvs := make(map[string]string, len(values))
+
+	for _, value := range values {
+		terms := strings.SplitN(value, "=", 2)
+		if len(terms) != 2 {
+			return nil, errors.New("the format must be key=value")
+		}
+		kvs[terms[0]] = terms[1]
+	}
+	return kvs, nil
+}

apis/opts/log_options_test.go

@@ -0,0 +1,74 @@
+package opts
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestParseLogOptions(t *testing.T) {
+	type tCases struct {
+		driver  string
+		logOpts []string
+
+		hasError bool
+		expected map[string]string
+	}
+
+	for idx, tc := range []tCases{
+		{
+			driver:   "",
+			logOpts:  nil,
+			hasError: false,
+			expected: map[string]string{},
+		}, {
+			driver:   "none",
+			logOpts:  nil,
+			hasError: false,
+			expected: map[string]string{},
+		}, {
+			driver:   "none",
+			logOpts:  []string{"haha"},
+			hasError: true,
+			expected: nil,
+		}, {
+			driver:   "none",
+			logOpts:  []string{"test=1"},
+			hasError: true,
+			expected: nil,
+		}, {
+			driver:   "json-file",
+			logOpts:  []string{"test=1"},
+			hasError: false,
+			expected: map[string]string{
+				"test": "1",
+			},
+		}, {
+			driver:   "json-file",
+			logOpts:  []string{"test=1=1"},
+			hasError: false,
+			expected: map[string]string{
+				"test": "1=1",
+			},
+		}, {
+			driver:   "json-file",
+			logOpts:  []string{"test=1", "flag=oops", "test=2"},
+			hasError: false,
+			expected: map[string]string{
+				"test": "2",
+				"flag": "oops",
+			},
+		},
+	} {
+		got, err := ParseLogOptions(tc.driver, tc.logOpts)
+		if err == nil && tc.hasError {
+			t.Fatalf("[%d case] should have error here, but got nothing", idx)
+		}
+		if err != nil && !tc.hasError {
+			t.Fatalf("[%d case] should have no error here, but got error(%v)", idx, err)
+		}
+
+		if !reflect.DeepEqual(got, tc.expected) {
+			t.Fatalf("[%d case] should have (%v), but got (%v)", idx, tc.expected, got)
+		}
+	}
+}

cli/common_flags.go

@@ -42,6 +42,10 @@ func addCommonFlags(flagSet *pflag.FlagSet) *container {
 	flagSet.StringVar(&c.ipcMode, "ipc", "", "IPC namespace to use")
 	flagSet.StringSliceVarP(&c.labels, "label", "l", nil, "Set labels for a container")
 
+	// log driver and log options
+	flagSet.StringVar(&c.logDriver, "log-driver", "json-file", "Logging driver for the container")
+	flagSet.StringSliceVar(&c.logOpts, "log-opt", nil, "Log driver options")
+
 	// memory
 
 	flagSet.StringVarP(&c.memory, "memory", "m", "", "Memory limit")

cli/container.go

@@ -72,6 +72,10 @@ type container struct {
 	ulimit         Ulimit
 	pidsLimit      int64
 
+	// log driver and log option
+	logDriver string
+	logOpts   []string
+
 	//add for rich container mode
 	rich       bool
 	richMode   string
@@ -172,6 +176,11 @@ func (c *container) config() (*types.ContainerCreateConfig, error) {
 		return nil, err
 	}
 
+	logOpts, err := opts.ParseLogOptions(c.logDriver, c.logOpts)
+	if err != nil {
+		return nil, err
+	}
+
 	config := &types.ContainerCreateConfig{
 		ContainerConfig: types.ContainerConfig{
 			Tty:                 c.tty,
@@ -242,6 +251,10 @@ func (c *container) config() (*types.ContainerCreateConfig, error) {
 			CapDrop:       c.capDrop,
 			PortBindings:  portBindings,
 			OomScoreAdj:   c.oomScoreAdj,
+			LogConfig: &types.LogConfig{
+				LogDriver: c.logDriver,
+				LogOpts:   logOpts,
+			},
 		},
 
 		NetworkingConfig: networkingConfig,

daemon/containerio/jsonfile.go

@@ -37,11 +37,12 @@ func (jf *jsonFile) Name() string {
 }
 
 func (jf *jsonFile) Init(opt *Option) error {
-	if _, err := os.Stat(opt.rootDir); err != nil {
+	rootDir := opt.info.ContainerRootDir
+	if _, err := os.Stat(rootDir); err != nil {
 		return err
 	}
 
-	logPath := filepath.Join(opt.rootDir, jsonFilePathName)
+	logPath := filepath.Join(rootDir, jsonFilePathName)
 	w, err := jsonfile.NewJSONLogFile(logPath, 0644)
 	if err != nil {
 		return err

daemon/containerio/options.go

@@ -6,12 +6,16 @@ import (
 	"os"
 
 	"github.com/alibaba/pouch/cri/stream/remotecommand"
+	"github.com/alibaba/pouch/daemon/logger"
 )
 
 // Option is used to pass some data into ContainerIO.
+//
+// FIXME(fuwei): use logger.Info to separate options and backends.
 type Option struct {
+	info logger.Info
+
 	id            string
-	rootDir       string
 	stdin         bool
 	muxDisabled   bool
 	backends      map[string]struct{}
@@ -41,10 +45,10 @@ func WithID(id string) func(*Option) {
 	}
 }
 
-// WithRootDir specified the container's root dir.
-func WithRootDir(dir string) func(*Option) {
+// WithLoggerInfo specified the container's logger information.
+func WithLoggerInfo(info logger.Info) func(*Option) {
 	return func(opt *Option) {
-		opt.rootDir = dir
+		opt.info = info
 	}
 }
 
@@ -82,6 +86,16 @@ func WithJSONFile() func(*Option) {
 	}
 }
 
+// WithSyslog specified the syslog backend.
+func WithSyslog() func(*Option) {
+	return func(opt *Option) {
+		if opt.backends == nil {
+			opt.backends = make(map[string]struct{})
+		}
+		opt.backends["syslog"] = struct{}{}
+	}
+}
+
 // WithHijack specified the hijack backend.
 func WithHijack(hi http.Hijacker, upgrade bool) func(*Option) {
 	return func(opt *Option) {

daemon/containerio/syslog.go

@@ -0,0 +1,73 @@
+package containerio
+
+import (
+	"io"
+
+	"github.com/alibaba/pouch/daemon/logger"
+	"github.com/alibaba/pouch/daemon/logger/syslog"
+)
+
+func init() {
+	Register(func() Backend {
+		return &syslogging{}
+	})
+}
+
+type customWriter struct {
+	w func(p []byte) (int, error)
+}
+
+func (cw *customWriter) Write(p []byte) (int, error) {
+	return cw.w(p)
+}
+
+type syslogging struct {
+	w *syslog.Syslog
+}
+
+func (s *syslogging) Init(opt *Option) error {
+	w, err := syslog.NewSyslog(opt.info)
+	if err != nil {
+		return err
+	}
+	s.w = w
+	return nil
+}
+
+func (s *syslogging) Name() string {
+	return "syslog"
+}
+
+func (s *syslogging) In() io.Reader {
+	return nil
+}
+
+func (s *syslogging) Out() io.Writer {
+	return &customWriter{w: s.sourceWriteFunc("stdout")}
+}
+
+func (s *syslogging) Err() io.Writer {
+	return &customWriter{w: s.sourceWriteFunc("stderr")}
+}
+
+func (s *syslogging) Close() error {
+	return s.w.Close()
+}
+
+func (s *syslogging) sourceWriteFunc(source string) func([]byte) (int, error) {
+	return func(p []byte) (int, error) {
+		if len(p) == 0 {
+			return 0, nil
+		}
+
+		msg := &logger.LogMessage{
+			Source: source,
+			Line:   p,
+		}
+
+		if err := s.w.WriteLogMessage(msg); err != nil {
+			return 0, err
+		}
+		return len(p), nil
+	}
+}

daemon/logger/info.go

@@ -0,0 +1,45 @@
+package logger
+
+import (
+	"github.com/alibaba/pouch/pkg/utils"
+)
+
+// Info provides container information for log driver.
+//
+// TODO(fuwei): add more fields.
+type Info struct {
+	LogConfig map[string]string
+
+	ContainerID      string
+	ContainerName    string
+	ContainerImageID string
+	ContainerLabels  map[string]string
+	ContainerRootDir string
+
+	DaemonName string
+}
+
+// ID returns the container truncated ID.
+func (i *Info) ID() string {
+	return utils.TruncateID(i.ContainerID)
+}
+
+// FullID returns the container ID.
+func (i *Info) FullID() string {
+	return i.ContainerID
+}
+
+// Name returns the container name.
+func (i *Info) Name() string {
+	return i.ContainerName
+}
+
+// ImageID returns the container's image truncated ID.
+func (i *Info) ImageID() string {
+	return utils.TruncateID(i.ContainerImageID)
+}
+
+// ImageFullID returns the container's image ID.
+func (i *Info) ImageFullID() string {
+	return i.ContainerImageID
+}

daemon/logger/loggerutils/tag.go

@@ -0,0 +1,28 @@
+package loggerutils
+
+import (
+	"bytes"
+
+	"github.com/alibaba/pouch/daemon/logger"
+	"github.com/alibaba/pouch/pkg/utils/templates"
+)
+
+// GenerateLogTag returns a tag which can be used for different log drivers
+// based on the container.
+func GenerateLogTag(info logger.Info, defaultTemplate string) (string, error) {
+	tagTemplate := info.LogConfig["tag"]
+	if tagTemplate == "" {
+		tagTemplate = defaultTemplate
+	}
+
+	tmpl, err := templates.NewParse("logtag", tagTemplate)
+	if err != nil {
+		return "", err
+	}
+
+	buf := bytes.Buffer{}
+	if err := tmpl.Execute(&buf, &info); err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}