Golang JSON format File parsing

This is a creation in Article, where the information may have evolved or changed.

package mainimport  ("bytes" "Encoding/json" "FMT" "Log" "OS" "RegExp" "Time") const  configfilesizelimit = 10 << 20var defaultconfig = &struct { nettimeout   int64filedeadtime string}{nettimeout:   15,filedeadtime:  "24h",}//with the ' json:network ' comment, after JSON parsing can plug the corresponding data into the corresponding structure to type config struct {network  networkconfig  ' json:network ' files   []fileconfig   ' json:files '}type  networkconfig struct {servers        []string  ' JSON: Servers ' sslcertificate string    ' JSON: "Ssl certificate" ' sslkey          string    ' JSON: "Ssl key" ' sslca           string    ' JSON: "Ssl ca" ' timeout         int64     ' Json:timeout ' timeout        time. duration}type fileconfig struct {paths    []string            ' json:paths ' fields   map[string]string  ' json:fields ' deadtime string             ' JSON: ' dead  Time "' Deadtime time. Duration}func main ()  {loadconfig ("e:/golang/src/github.com/test/logstast_forwarder.conf")}func  Loadconfig (path string)   (Config config, err error)  {config_file, err : = os. Open (path) if err != nil {emit ("failed to open config file  '%s '):  %s\n ",  path, err) return}fi, _ := config_file. Stat () If size := fi. Size (); size >  (configfilesizelimit)  {emit ("config file  (%q)  size  exceeds reasonable limit  (%d)  - aborting ",  path, size) return // revu:  Shouldn ' T this return an error, then?} If fi. Size ()  == 0 {emit ("config file  (%q)  is empty, skipping",  path) Return}buffer := make ([]byte, fi. Size ()) _, err = config_file. Read (buffer) emit ("\n %s\n",  buffer) buffer, err = stripcomments (buffer)  //remove Comment if  err != nil {emit ("failed to strip comments from json: %s\n" ,  err) return}buffer = []byte (OS. Expandenv (string (buffer)))  //special Err = json. Unmarshal (buffer, &config)  //parse JSON format data if err != nil {emit ("Failed  Unmarshalling json: %s\n ",  err) return}        fmt. Printf ("111111111 %s \n",  config.network.servers) For k, _&nbsP;:= range config. Files {if config. FILES[K]. deadtime ==  ""  {config. FILES[K]. Deadtime = defaultconfig.filedeadtime}config. Files[k].deadtime, err = time. Parseduration (config. FILES[K]. Deadtime) If err != nil {emit ("Failed to parse dead time duration   '%s '.  error was: %s\n ",  config. FILES[K]. Deadtime, err) return}}return}func stripcomments (data []byte)   ([]byte, error)  { Data = bytes. Replace (Data, []byte ("\ R"),  []byte (""),  0)  // windowslines := bytes. Split (Data, []byte ("\ n"))                  //split to muli linesfiltered := make ([][]byte, 0) For _,  line := range lines {match, err := regexp. Match (' ^\s*# ',  line) if err != Nil {return nil, err}if !match {filtered = append (Filtered, line)}} Return bytes. Join (Filtered, []byte ("\ n")),  nil}func emit (msgfmt string, args ...interface{})  {log. Printf (Msgfmt, args ...)}

JSON configuration file:

# # JSON format file{"network": {"Servers": ["localhost:5043"]}, "Files": [{"Paths": [""]}]}

Output Result:

111111111 [localhost:5043] 2015/10/05 16:45:21 # # JSON format file{"network": {"Servers": ["localhost:5043"]}, "Files": [{"Paths": [""]}]}

Visible, Golang parsing of JSON files is very simple and comfortable