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118 lines
2.8 KiB
118 lines
2.8 KiB
9 years ago
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// Copyright 2012 Gary Burd
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package redis
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import (
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"bytes"
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"fmt"
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"log"
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)
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// NewLoggingConn returns a logging wrapper around a connection.
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func NewLoggingConn(conn Conn, logger *log.Logger, prefix string) Conn {
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if prefix != "" {
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prefix = prefix + "."
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}
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return &loggingConn{conn, logger, prefix}
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}
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type loggingConn struct {
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Conn
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logger *log.Logger
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prefix string
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}
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func (c *loggingConn) Close() error {
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err := c.Conn.Close()
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var buf bytes.Buffer
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fmt.Fprintf(&buf, "%sClose() -> (%v)", c.prefix, err)
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c.logger.Output(2, buf.String())
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return err
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}
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func (c *loggingConn) printValue(buf *bytes.Buffer, v interface{}) {
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const chop = 32
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switch v := v.(type) {
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case []byte:
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if len(v) > chop {
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fmt.Fprintf(buf, "%q...", v[:chop])
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} else {
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fmt.Fprintf(buf, "%q", v)
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}
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case string:
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if len(v) > chop {
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fmt.Fprintf(buf, "%q...", v[:chop])
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} else {
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fmt.Fprintf(buf, "%q", v)
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}
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case []interface{}:
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if len(v) == 0 {
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buf.WriteString("[]")
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} else {
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sep := "["
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fin := "]"
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if len(v) > chop {
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v = v[:chop]
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fin = "...]"
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}
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for _, vv := range v {
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buf.WriteString(sep)
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c.printValue(buf, vv)
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sep = ", "
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}
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buf.WriteString(fin)
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}
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default:
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fmt.Fprint(buf, v)
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}
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}
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func (c *loggingConn) print(method, commandName string, args []interface{}, reply interface{}, err error) {
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var buf bytes.Buffer
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fmt.Fprintf(&buf, "%s%s(", c.prefix, method)
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if method != "Receive" {
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buf.WriteString(commandName)
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for _, arg := range args {
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buf.WriteString(", ")
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c.printValue(&buf, arg)
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}
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}
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buf.WriteString(") -> (")
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if method != "Send" {
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c.printValue(&buf, reply)
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buf.WriteString(", ")
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}
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fmt.Fprintf(&buf, "%v)", err)
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c.logger.Output(3, buf.String())
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}
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func (c *loggingConn) Do(commandName string, args ...interface{}) (interface{}, error) {
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reply, err := c.Conn.Do(commandName, args...)
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c.print("Do", commandName, args, reply, err)
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return reply, err
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}
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func (c *loggingConn) Send(commandName string, args ...interface{}) error {
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err := c.Conn.Send(commandName, args...)
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c.print("Send", commandName, args, nil, err)
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return err
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}
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func (c *loggingConn) Receive() (interface{}, error) {
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reply, err := c.Conn.Receive()
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c.print("Receive", "", nil, reply, err)
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return reply, err
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}
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