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utils.go
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utils.go
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package geoserver
import (
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"path"
"path/filepath"
"reflect"
)
//HTTPRequest is an http request object
type HTTPRequest struct {
URL string
Accept string
Query map[string]string
Data io.Reader
DataType string
Method string
}
//UtilsInterface contians common function used to help you deal with data and geoserver api
type UtilsInterface interface {
DoRequest(request HTTPRequest) (responseText []byte, statusCode int)
SerializeStruct(structObj interface{}) ([]byte, error)
DeSerializeJSON(response []byte, structObj interface{}) (err error)
ParseURL(urlParts ...string) (parsedURL string)
}
//DoRequest Send request and return result and statusCode
func (g *GeoServer) DoRequest(request HTTPRequest) (responseText []byte, statusCode int) {
defer func() {
if r := recover(); r != nil {
responseText = []byte(fmt.Sprintf("%s", r))
statusCode = 0
}
}()
var req *http.Request
switch request.Method {
case getMethod, deleteMethod:
req = g.GetGeoserverRequest(request.URL, request.Method, request.Accept, nil, "")
case postMethod, putMethod:
req = g.GetGeoserverRequest(request.URL, request.Method, request.Accept, request.Data, request.DataType)
default:
panic("unrecognized http request Method")
}
if len(request.Query) != 0 {
q := req.URL.Query()
for k, v := range request.Query {
q.Add(k, v)
}
req.URL.RawQuery = q.Encode()
}
response, responseErr := g.HttpClient.Do(req)
if responseErr != nil {
panic(responseErr)
}
defer response.Body.Close()
body, _ := ioutil.ReadAll(response.Body)
g.logger.Infof("url:%s Status=%s", req.URL, response.Status)
return body, response.StatusCode
}
//GetError this return the proper error message
func (g *GeoServer) GetError(statusCode int, text []byte) (err error) {
geoserverErr, ok := statusErrorMapping[statusCode]
if !ok {
geoserverErr = fmt.Errorf("Unexpected Error with status code %d", statusCode)
}
errDetails := string(text)
fullMSG := fmt.Sprintf("abstract:%s\ndetails:%s\n", geoserverErr, errDetails)
return errors.New(fullMSG)
}
// IsEmpty helper function to check if obj/struct is nil/empty
func IsEmpty(object interface{}) bool {
if object == nil {
return true
} else if object == "" {
return true
} else if object == false {
return true
}
if reflect.ValueOf(object).Kind() == reflect.Struct {
empty := reflect.New(reflect.TypeOf(object)).Elem().Interface()
if reflect.DeepEqual(object, empty) {
return true
}
}
return false
}
//SerializeStruct convert struct to json
func (g *GeoServer) SerializeStruct(structObj interface{}) ([]byte, error) {
serializedStruct, err := json.Marshal(&structObj)
if err != nil {
g.logger.Error(err)
return nil, err
}
return serializedStruct, nil
}
//DeSerializeJSON json struct to struct
func (g *GeoServer) DeSerializeJSON(response []byte, structObj interface{}) (err error) {
err = json.Unmarshal(response, &structObj)
if err != nil {
g.logger.Error(err)
return err
}
return nil
}
func (g *GeoServer) getGoGeoserverPackageDir() string {
dir, err := filepath.Abs("./")
if err != nil {
panic(err)
}
return dir
}
//ParseURL this function join urlParts with geoserver url
func (g *GeoServer) ParseURL(urlParts ...string) (parsedURL string) {
defer func() {
if r := recover(); r != nil {
parsedURL = ""
}
}()
geoserverURL, err := url.Parse(g.ServerURL)
if err != nil {
g.logger.Error(err)
panic(err)
}
urlArr := append([]string{geoserverURL.Path}, urlParts...)
geoserverURL.Path = path.Join(urlArr...)
parsedURL = geoserverURL.String()
return
}