github.com/astaxie/beego@v1.12.3/logs/conn.go (about)

     1  // Copyright 2014 beego Author. All Rights Reserved.
     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 logs
    16  
    17  import (
    18  	"encoding/json"
    19  	"io"
    20  	"net"
    21  	"time"
    22  )
    23  
    24  // connWriter implements LoggerInterface.
    25  // it writes messages in keep-live tcp connection.
    26  type connWriter struct {
    27  	lg             *logWriter
    28  	innerWriter    io.WriteCloser
    29  	ReconnectOnMsg bool   `json:"reconnectOnMsg"`
    30  	Reconnect      bool   `json:"reconnect"`
    31  	Net            string `json:"net"`
    32  	Addr           string `json:"addr"`
    33  	Level          int    `json:"level"`
    34  }
    35  
    36  // NewConn create new ConnWrite returning as LoggerInterface.
    37  func NewConn() Logger {
    38  	conn := new(connWriter)
    39  	conn.Level = LevelTrace
    40  	return conn
    41  }
    42  
    43  // Init init connection writer with json config.
    44  // json config only need key "level".
    45  func (c *connWriter) Init(jsonConfig string) error {
    46  	return json.Unmarshal([]byte(jsonConfig), c)
    47  }
    48  
    49  // WriteMsg write message in connection.
    50  // if connection is down, try to re-connect.
    51  func (c *connWriter) WriteMsg(when time.Time, msg string, level int) error {
    52  	if level > c.Level {
    53  		return nil
    54  	}
    55  	if c.needToConnectOnMsg() {
    56  		err := c.connect()
    57  		if err != nil {
    58  			return err
    59  		}
    60  	}
    61  
    62  	if c.ReconnectOnMsg {
    63  		defer c.innerWriter.Close()
    64  	}
    65  
    66  	_, err := c.lg.writeln(when, msg)
    67  	if err != nil {
    68  		return err
    69  	}
    70  	return nil
    71  }
    72  
    73  // Flush implementing method. empty.
    74  func (c *connWriter) Flush() {
    75  
    76  }
    77  
    78  // Destroy destroy connection writer and close tcp listener.
    79  func (c *connWriter) Destroy() {
    80  	if c.innerWriter != nil {
    81  		c.innerWriter.Close()
    82  	}
    83  }
    84  
    85  func (c *connWriter) connect() error {
    86  	if c.innerWriter != nil {
    87  		c.innerWriter.Close()
    88  		c.innerWriter = nil
    89  	}
    90  
    91  	conn, err := net.Dial(c.Net, c.Addr)
    92  	if err != nil {
    93  		return err
    94  	}
    95  
    96  	if tcpConn, ok := conn.(*net.TCPConn); ok {
    97  		tcpConn.SetKeepAlive(true)
    98  	}
    99  
   100  	c.innerWriter = conn
   101  	c.lg = newLogWriter(conn)
   102  	return nil
   103  }
   104  
   105  func (c *connWriter) needToConnectOnMsg() bool {
   106  	if c.Reconnect {
   107  		return true
   108  	}
   109  
   110  	if c.innerWriter == nil {
   111  		return true
   112  	}
   113  
   114  	return c.ReconnectOnMsg
   115  }
   116  
   117  func init() {
   118  	Register(AdapterConn, NewConn)
   119  }