Format and remove 13.4.md spaces
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vCaesar
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zh/13.4.md
316
zh/13.4.md
@@ -10,83 +10,83 @@ beego的日志设计部署思路来自于seelog，根据不同的level来记录
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```Go
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// Log levels to control the logging output.
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const (
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LevelTrace = iota
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LevelDebug
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LevelInfo
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LevelWarning
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LevelError
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LevelCritical
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)
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// Log levels to control the logging output.
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const (
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LevelTrace = iota
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LevelDebug
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LevelInfo
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LevelWarning
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LevelError
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LevelCritical
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)
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// logLevel controls the global log level used by the logger.
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var level = LevelTrace
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// logLevel controls the global log level used by the logger.
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var level = LevelTrace
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// LogLevel returns the global log level and can be used in
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// own implementations of the logger interface.
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func Level() int {
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return level
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}
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// LogLevel returns the global log level and can be used in
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// own implementations of the logger interface.
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func Level() int {
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return level
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}
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// SetLogLevel sets the global log level used by the simple
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// logger.
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func SetLevel(l int) {
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level = l
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}
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// SetLogLevel sets the global log level used by the simple
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// logger.
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func SetLevel(l int) {
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level = l
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}
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```
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上面这一段实现了日志系统的日志分级，默认的级别是Trace，用户通过SetLevel可以设置不同的分级。
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```Go
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// logger references the used application logger.
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var BeeLogger = log.New(os.Stdout, "", log.Ldate|log.Ltime)
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// logger references the used application logger.
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var BeeLogger = log.New(os.Stdout, "", log.Ldate|log.Ltime)
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// SetLogger sets a new logger.
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func SetLogger(l *log.Logger) {
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BeeLogger = l
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}
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// SetLogger sets a new logger.
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func SetLogger(l *log.Logger) {
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BeeLogger = l
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}
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// Trace logs a message at trace level.
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func Trace(v ...interface{}) {
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if level <= LevelTrace {
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BeeLogger.Printf("[T] %v\n", v)
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}
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// Trace logs a message at trace level.
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func Trace(v ...interface{}) {
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if level <= LevelTrace {
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BeeLogger.Printf("[T] %v\n", v)
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}
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}
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// Debug logs a message at debug level.
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func Debug(v ...interface{}) {
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if level <= LevelDebug {
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BeeLogger.Printf("[D] %v\n", v)
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}
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// Debug logs a message at debug level.
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func Debug(v ...interface{}) {
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if level <= LevelDebug {
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BeeLogger.Printf("[D] %v\n", v)
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}
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}
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// Info logs a message at info level.
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func Info(v ...interface{}) {
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if level <= LevelInfo {
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BeeLogger.Printf("[I] %v\n", v)
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}
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// Info logs a message at info level.
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func Info(v ...interface{}) {
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if level <= LevelInfo {
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BeeLogger.Printf("[I] %v\n", v)
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}
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}
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// Warning logs a message at warning level.
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func Warn(v ...interface{}) {
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if level <= LevelWarning {
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BeeLogger.Printf("[W] %v\n", v)
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}
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// Warning logs a message at warning level.
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func Warn(v ...interface{}) {
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if level <= LevelWarning {
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BeeLogger.Printf("[W] %v\n", v)
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}
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}
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// Error logs a message at error level.
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func Error(v ...interface{}) {
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if level <= LevelError {
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BeeLogger.Printf("[E] %v\n", v)
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}
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// Error logs a message at error level.
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func Error(v ...interface{}) {
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if level <= LevelError {
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BeeLogger.Printf("[E] %v\n", v)
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}
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}
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// Critical logs a message at critical level.
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func Critical(v ...interface{}) {
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if level <= LevelCritical {
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BeeLogger.Printf("[C] %v\n", v)
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}
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// Critical logs a message at critical level.
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func Critical(v ...interface{}) {
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if level <= LevelCritical {
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BeeLogger.Printf("[C] %v\n", v)
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}
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}
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```
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上面这一段代码默认初始化了一个BeeLogger对象，默认输出到os.Stdout，用户可以通过beego.SetLogger来设置实现了logger的接口输出。这里面实现了六个函数：
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@@ -121,133 +121,133 @@ beego的日志设计部署思路来自于seelog，根据不同的level来记录
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首先定义了一些ini配置文件的一些全局性常量 ：
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```Go
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var (
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bComment = []byte{'#'}
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bEmpty = []byte{}
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bEqual = []byte{'='}
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bDQuote = []byte{'"'}
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)
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var (
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bComment = []byte{'#'}
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bEmpty = []byte{}
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bEqual = []byte{'='}
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bDQuote = []byte{'"'}
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)
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```
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定义了配置文件的格式：
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```Go
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// A Config represents the configuration.
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type Config struct {
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filename string
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comment map[int][]string // id: []{comment, key...}; id 1 is for main comment.
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data map[string]string // key: value
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offset map[string]int64 // key: offset; for editing.
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sync.RWMutex
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}
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// A Config represents the configuration.
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type Config struct {
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filename string
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comment map[int][]string // id: []{comment, key...}; id 1 is for main comment.
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data map[string]string // key: value
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offset map[string]int64 // key: offset; for editing.
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sync.RWMutex
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}
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```
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定义了解析文件的函数，解析文件的过程是打开文件，然后一行一行的读取，解析注释、空行和key=value数据：
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```Go
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// ParseFile creates a new Config and parses the file configuration from the
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// named file.
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func LoadConfig(name string) (*Config, error) {
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file, err := os.Open(name)
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if err != nil {
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return nil, err
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}
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cfg := &Config{
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file.Name(),
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make(map[int][]string),
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make(map[string]string),
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make(map[string]int64),
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sync.RWMutex{},
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}
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cfg.Lock()
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defer cfg.Unlock()
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defer file.Close()
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var comment bytes.Buffer
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buf := bufio.NewReader(file)
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for nComment, off := 0, int64(1); ; {
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line, _, err := buf.ReadLine()
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if err == io.EOF {
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break
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}
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if bytes.Equal(line, bEmpty) {
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continue
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}
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off += int64(len(line))
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if bytes.HasPrefix(line, bComment) {
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line = bytes.TrimLeft(line, "#")
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line = bytes.TrimLeftFunc(line, unicode.IsSpace)
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comment.Write(line)
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comment.WriteByte('\n')
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continue
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}
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if comment.Len() != 0 {
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cfg.comment[nComment] = []string{comment.String()}
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comment.Reset()
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nComment++
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}
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val := bytes.SplitN(line, bEqual, 2)
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if bytes.HasPrefix(val[1], bDQuote) {
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val[1] = bytes.Trim(val[1], `"`)
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}
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key := strings.TrimSpace(string(val[0]))
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cfg.comment[nComment-1] = append(cfg.comment[nComment-1], key)
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cfg.data[key] = strings.TrimSpace(string(val[1]))
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cfg.offset[key] = off
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}
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return cfg, nil
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// ParseFile creates a new Config and parses the file configuration from the
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// named file.
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func LoadConfig(name string) (*Config, error) {
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file, err := os.Open(name)
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if err != nil {
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return nil, err
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}
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cfg := &Config{
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file.Name(),
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make(map[int][]string),
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make(map[string]string),
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make(map[string]int64),
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sync.RWMutex{},
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}
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cfg.Lock()
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defer cfg.Unlock()
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defer file.Close()
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var comment bytes.Buffer
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buf := bufio.NewReader(file)
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for nComment, off := 0, int64(1); ; {
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line, _, err := buf.ReadLine()
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if err == io.EOF {
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break
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}
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if bytes.Equal(line, bEmpty) {
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continue
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}
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off += int64(len(line))
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if bytes.HasPrefix(line, bComment) {
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line = bytes.TrimLeft(line, "#")
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line = bytes.TrimLeftFunc(line, unicode.IsSpace)
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comment.Write(line)
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comment.WriteByte('\n')
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continue
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}
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if comment.Len() != 0 {
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cfg.comment[nComment] = []string{comment.String()}
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comment.Reset()
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nComment++
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}
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val := bytes.SplitN(line, bEqual, 2)
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if bytes.HasPrefix(val[1], bDQuote) {
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val[1] = bytes.Trim(val[1], `"`)
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}
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key := strings.TrimSpace(string(val[0]))
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cfg.comment[nComment-1] = append(cfg.comment[nComment-1], key)
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cfg.data[key] = strings.TrimSpace(string(val[1]))
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cfg.offset[key] = off
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}
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return cfg, nil
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}
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```
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下面实现了一些读取配置文件的函数，返回的值确定为bool、int、float64或string：
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```Go
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// Bool returns the boolean value for a given key.
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func (c *Config) Bool(key string) (bool, error) {
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return strconv.ParseBool(c.data[key])
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}
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// Bool returns the boolean value for a given key.
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func (c *Config) Bool(key string) (bool, error) {
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return strconv.ParseBool(c.data[key])
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}
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// Int returns the integer value for a given key.
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func (c *Config) Int(key string) (int, error) {
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return strconv.Atoi(c.data[key])
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}
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// Int returns the integer value for a given key.
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func (c *Config) Int(key string) (int, error) {
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return strconv.Atoi(c.data[key])
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}
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// Float returns the float value for a given key.
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func (c *Config) Float(key string) (float64, error) {
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return strconv.ParseFloat(c.data[key], 64)
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}
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// Float returns the float value for a given key.
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func (c *Config) Float(key string) (float64, error) {
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return strconv.ParseFloat(c.data[key], 64)
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}
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// String returns the string value for a given key.
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func (c *Config) String(key string) string {
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return c.data[key]
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}
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// String returns the string value for a given key.
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func (c *Config) String(key string) string {
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return c.data[key]
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}
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```
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## 应用指南
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下面这个函数是我一个应用中的例子，用来获取远程url地址的json数据，实现如下：
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```Go
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func GetJson() {
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resp, err := http.Get(beego.AppConfig.String("url"))
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if err != nil {
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beego.Critical("http get info error")
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return
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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err = json.Unmarshal(body, &AllInfo)
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if err != nil {
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beego.Critical("error:", err)
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}
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func GetJson() {
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resp, err := http.Get(beego.AppConfig.String("url"))
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if err != nil {
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beego.Critical("http get info error")
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return
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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err = json.Unmarshal(body, &AllInfo)
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if err != nil {
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beego.Critical("error:", err)
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}
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}
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```
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函数中调用了框架的日志函数`beego.Critical`函数用来报错，调用了`beego.AppConfig.String("url")`用来获取配置文件中的信息，配置文件的信息如下(app.conf)：
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```Go
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appname = hs
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url ="http://www.api.com/api.html"
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appname = hs
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url ="http://www.api.com/api.html"
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```
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## links
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