istio.io/istio@v0.0.0-20240520182934-d79c90f27776/cni/pkg/log/uds.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package log
    16  
    17  import (
    18  	"encoding/json"
    19  	"fmt"
    20  	"io"
    21  	"net/http"
    22  	"strings"
    23  	"sync"
    24  	"time"
    25  
    26  	"istio.io/istio/cni/pkg/constants"
    27  	"istio.io/istio/pkg/log"
    28  	"istio.io/istio/pkg/network"
    29  	"istio.io/istio/pkg/uds"
    30  )
    31  
    32  var pluginLog = log.RegisterScope("cni", "CNI network plugin")
    33  
    34  type UDSLogger struct {
    35  	mu            sync.Mutex
    36  	loggingServer *http.Server
    37  }
    38  
    39  type cniLog struct {
    40  	Level string    `json:"level"`
    41  	Time  time.Time `json:"time"`
    42  	Msg   string    `json:"msg"`
    43  }
    44  
    45  func NewUDSLogger() *UDSLogger {
    46  	l := &UDSLogger{}
    47  	mux := http.NewServeMux()
    48  	mux.HandleFunc(constants.UDSLogPath, l.handleLog)
    49  	loggingServer := &http.Server{
    50  		Handler: mux,
    51  	}
    52  	l.loggingServer = loggingServer
    53  	return l
    54  }
    55  
    56  // StartUDSLogServer starts up a UDS server which receives log reported from CNI network plugin.
    57  func (l *UDSLogger) StartUDSLogServer(sockAddress string, stop <-chan struct{}) error {
    58  	if sockAddress == "" {
    59  		return nil
    60  	}
    61  	log.Info("Start a UDS server for CNI plugin logs")
    62  	unixListener, err := uds.NewListener(sockAddress)
    63  	if err != nil {
    64  		return fmt.Errorf("failed to create UDS listener: %v", err)
    65  	}
    66  	go func() {
    67  		if err := l.loggingServer.Serve(unixListener); network.IsUnexpectedListenerError(err) {
    68  			log.Errorf("Error running UDS log server: %v", err)
    69  		}
    70  	}()
    71  
    72  	go func() {
    73  		<-stop
    74  		if err := l.loggingServer.Close(); err != nil {
    75  			log.Errorf("CNI log server terminated with error: %v", err)
    76  		} else {
    77  			log.Debug("CNI log server terminated")
    78  		}
    79  	}()
    80  
    81  	return nil
    82  }
    83  
    84  func (l *UDSLogger) handleLog(w http.ResponseWriter, req *http.Request) {
    85  	if req.Body == nil {
    86  		return
    87  	}
    88  	defer req.Body.Close()
    89  	data, err := io.ReadAll(req.Body)
    90  	if err != nil {
    91  		log.Errorf("Failed to read log report from cni plugin: %v", err)
    92  		return
    93  	}
    94  	l.processLog(data)
    95  }
    96  
    97  func (l *UDSLogger) processLog(body []byte) {
    98  	cniLogs := make([]string, 0)
    99  	err := json.Unmarshal(body, &cniLogs)
   100  	if err != nil {
   101  		log.Errorf("Failed to unmarshal CNI plugin logs: %v", err)
   102  		return
   103  	}
   104  	messages := make([]cniLog, 0, len(cniLogs))
   105  	for _, l := range cniLogs {
   106  		var msg cniLog
   107  		if err := json.Unmarshal([]byte(l), &msg); err != nil {
   108  			log.Debugf("Failed to unmarshal CNI plugin log entry: %v", err)
   109  			continue
   110  		}
   111  		msg.Msg = strings.TrimSpace(msg.Msg)
   112  		messages = append(messages, msg)
   113  	}
   114  	// Lock log message printing to prevent log messages from different CNI
   115  	// processes interleave.
   116  	l.mu.Lock()
   117  	defer l.mu.Unlock()
   118  	for _, m := range messages {
   119  		// There is no fatal log from CNI plugin
   120  		switch m.Level {
   121  		case "debug":
   122  			pluginLog.LogWithTime(log.DebugLevel, m.Msg, m.Time)
   123  		case "info":
   124  			pluginLog.LogWithTime(log.InfoLevel, m.Msg, m.Time)
   125  		case "warn":
   126  			pluginLog.LogWithTime(log.WarnLevel, m.Msg, m.Time)
   127  		case "error":
   128  			pluginLog.LogWithTime(log.ErrorLevel, m.Msg, m.Time)
   129  		}
   130  	}
   131  }