log.go

Documentation: github.com/gomodule/redigo/redis

     1  // Copyright 2012 Gary Burd
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License"): you may
     4  // not use this file except in compliance with the License. You may obtain
     5  // 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, WITHOUT
    11  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    12  // License for the specific language governing permissions and limitations
    13  // under the License.
    14  
    15  package redis
    16  
    17  import (
    18  	"bytes"
    19  	"fmt"
    20  	"log"
    21  	"time"
    22  )
    23  
    24  var (
    25  	_ ConnWithTimeout = (*loggingConn)(nil)
    26  )
    27  
    28  // NewLoggingConn returns a logging wrapper around a connection.
    29  func NewLoggingConn(conn Conn, logger *log.Logger, prefix string) Conn {
    30  	if prefix != "" {
    31  		prefix = prefix + "."
    32  	}
    33  	return &loggingConn{conn, logger, prefix}
    34  }
    35  
    36  type loggingConn struct {
    37  	Conn
    38  	logger *log.Logger
    39  	prefix string
    40  }
    41  
    42  func (c *loggingConn) Close() error {
    43  	err := c.Conn.Close()
    44  	var buf bytes.Buffer
    45  	fmt.Fprintf(&buf, "%sClose() -> (%v)", c.prefix, err)
    46  	c.logger.Output(2, buf.String())
    47  	return err
    48  }
    49  
    50  func (c *loggingConn) printValue(buf *bytes.Buffer, v interface{}) {
    51  	const chop = 32
    52  	switch v := v.(type) {
    53  	case []byte:
    54  		if len(v) > chop {
    55  			fmt.Fprintf(buf, "%q...", v[:chop])
    56  		} else {
    57  			fmt.Fprintf(buf, "%q", v)
    58  		}
    59  	case string:
    60  		if len(v) > chop {
    61  			fmt.Fprintf(buf, "%q...", v[:chop])
    62  		} else {
    63  			fmt.Fprintf(buf, "%q", v)
    64  		}
    65  	case []interface{}:
    66  		if len(v) == 0 {
    67  			buf.WriteString("[]")
    68  		} else {
    69  			sep := "["
    70  			fin := "]"
    71  			if len(v) > chop {
    72  				v = v[:chop]
    73  				fin = "...]"
    74  			}
    75  			for _, vv := range v {
    76  				buf.WriteString(sep)
    77  				c.printValue(buf, vv)
    78  				sep = ", "
    79  			}
    80  			buf.WriteString(fin)
    81  		}
    82  	default:
    83  		fmt.Fprint(buf, v)
    84  	}
    85  }
    86  
    87  func (c *loggingConn) print(method, commandName string, args []interface{}, reply interface{}, err error) {
    88  	var buf bytes.Buffer
    89  	fmt.Fprintf(&buf, "%s%s(", c.prefix, method)
    90  	if method != "Receive" {
    91  		buf.WriteString(commandName)
    92  		for _, arg := range args {
    93  			buf.WriteString(", ")
    94  			c.printValue(&buf, arg)
    95  		}
    96  	}
    97  	buf.WriteString(") -> (")
    98  	if method != "Send" {
    99  		c.printValue(&buf, reply)
   100  		buf.WriteString(", ")
   101  	}
   102  	fmt.Fprintf(&buf, "%v)", err)
   103  	c.logger.Output(3, buf.String())
   104  }
   105  
   106  func (c *loggingConn) Do(commandName string, args ...interface{}) (interface{}, error) {
   107  	reply, err := c.Conn.Do(commandName, args...)
   108  	c.print("Do", commandName, args, reply, err)
   109  	return reply, err
   110  }
   111  
   112  func (c *loggingConn) DoWithTimeout(timeout time.Duration, commandName string, args ...interface{}) (interface{}, error) {
   113  	reply, err := DoWithTimeout(c.Conn, timeout, commandName, args...)
   114  	c.print("DoWithTimeout", commandName, args, reply, err)
   115  	return reply, err
   116  }
   117  
   118  func (c *loggingConn) Send(commandName string, args ...interface{}) error {
   119  	err := c.Conn.Send(commandName, args...)
   120  	c.print("Send", commandName, args, nil, err)
   121  	return err
   122  }
   123  
   124  func (c *loggingConn) Receive() (interface{}, error) {
   125  	reply, err := c.Conn.Receive()
   126  	c.print("Receive", "", nil, reply, err)
   127  	return reply, err
   128  }
   129  
   130  func (c *loggingConn) ReceiveWithTimeout(timeout time.Duration) (interface{}, error) {
   131  	reply, err := ReceiveWithTimeout(c.Conn, timeout)
   132  	c.print("ReceiveWithTimeout", "", nil, reply, err)
   133  	return reply, err
   134  }
   135
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