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callApi.go
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callApi.go
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// Copyright (c) 2016 ECS Team, Inc. - All Rights Reserved
// https://github.com/ECSTeam/cloudfoundry-top-plugin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package common
import (
"errors"
"fmt"
"reflect"
"strconv"
"strings"
"sync"
"time"
"github.com/cloudfoundry/cli/plugin"
"github.com/ecsteam/cloudfoundry-top-plugin/toplog"
)
const AUTH_ERROR = "Authentication has expired"
var (
curlMutex sync.Mutex
)
type handleResponseFunc func(outputBytes []byte) (data interface{}, nextUrl string, err error)
func CallAPI(cliConnection plugin.CliConnection, url string) (string, error) {
output, err := callCurlRetryable(cliConnection, url)
if err != nil {
return "", err
}
outputStr := strings.Join(output, "")
return outputStr, nil
}
func CallPagableAPI(cliConnection plugin.CliConnection, url string, handleResponse handleResponseFunc) error {
nextUrl := url
for nextUrl != "" {
if toplog.IsDebugEnabled() {
encodedUrl := strings.Replace(nextUrl, "%", "%%", -1)
toplog.Debug("nextUrl: \"%v\"", encodedUrl)
}
output, err := callCurlRetryable(cliConnection, nextUrl)
if err != nil {
return err
}
outputStr := strings.Join(output, "")
outputBytes := []byte(outputStr)
_, nextUrl, err = handleResponse(outputBytes)
if err != nil {
return err
}
}
return nil
}
func callCurlRetryable(cliConnection plugin.CliConnection, url string) ([]string, error) {
retryDelayMS := 500
maxRetries := 5
for retryCount := 0; retryCount < maxRetries; retryCount++ {
output, err := callCurl(cliConnection, url)
if err == nil {
return output, nil
}
msg := fmt.Sprintf("metadata.callApi>callCurlRetryable try#%v url:%v Error:%v", retryCount, url, err.Error())
toplog.Warn(msg)
if strings.Contains(err.Error(), AUTH_ERROR) {
return nil, err
}
sleepTime := time.Duration(retryDelayMS*maxRetries) * time.Millisecond
time.Sleep(sleepTime)
}
msg := "metadata.callApi>callCurlRetryable. Error calling " + url + " after " + strconv.Itoa(maxRetries) + " attempts"
toplog.Warn(msg)
return nil, errors.New(msg)
}
// Having issues calling cli CURL from multiple threads -- response text seems to get merged
// so lets just single thread the curl calls for now
func callCurl(cliConnection plugin.CliConnection, url string) ([]string, error) {
curlMutex.Lock()
defer curlMutex.Unlock()
return cliConnection.CliCommandWithoutTerminalOutput("curl", url)
}
func GetStringValueByFieldName(n interface{}, field_name string) (string, bool) {
s := reflect.ValueOf(n)
if s.Kind() == reflect.Ptr {
s = s.Elem()
}
if s.Kind() != reflect.Struct {
return "", false
}
f := s.FieldByName(field_name)
if !f.IsValid() {
return "", false
}
switch f.Kind() {
case reflect.String:
return f.Interface().(string), true
case reflect.Int:
return strconv.FormatInt(f.Int(), 10), true
// add cases for more kinds as needed.
default:
return "", false
// or use fmt.Sprint(f.Interface())
}
}
func GetIntValueByFieldName(n interface{}, field_name string) (int64, bool) {
s := reflect.ValueOf(n)
if s.Kind() == reflect.Ptr {
s = s.Elem()
}
if s.Kind() != reflect.Struct {
return -1, false
}
f := s.FieldByName(field_name)
if !f.IsValid() {
return -1, false
}
switch f.Kind() {
case reflect.String:
i, err := strconv.ParseInt(f.Interface().(string), 10, 64)
if err != nil {
return -1, false
}
return i, true
case reflect.Int:
return f.Int(), true
// add cases for more kinds as needed.
default:
return -1, false
// or use fmt.Sprint(f.Interface())
}
}
func GetObjectValueByFieldName(n interface{}, field_name string) (interface{}, bool) {
s := reflect.ValueOf(n)
if s.Kind() == reflect.Ptr {
s = s.Elem()
}
if s.Kind() != reflect.Struct {
return "", false
}
f := s.FieldByName(field_name)
if !f.IsValid() {
return "", false
}
return f.Interface(), true
}