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client.go
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client.go
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package client
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"mime/multipart"
"net/http"
"net/url"
"os"
"reflect"
"runtime"
"strconv"
"strings"
"time"
"github.com/hashicorp/go-retryablehttp"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
type OpsGenieClient struct {
RetryableClient *retryablehttp.Client
Config *Config
}
type request struct {
*retryablehttp.Request
}
type ApiRequest interface {
Validate() error
ResourcePath() string
Method() string
Metadata(apiRequest ApiRequest) map[string]interface{}
RequestParams() map[string]string
}
var metricPublisher = &MetricPublisher{}
type BaseRequest struct {
}
func (r *BaseRequest) Metadata(apiRequest ApiRequest) map[string]interface{} {
headers := make(map[string]interface{})
if apiRequest.Method() != http.MethodGet && apiRequest.Method() != http.MethodDelete {
headers["Content-Type"] = "application/json; charset=utf-8"
} else if apiRequest.Method() == http.MethodGet {
headers["Content-Type"] = "application/x-www-form-urlencoded; charset=UTF-8"
}
return headers
}
func (r *BaseRequest) RequestParams() map[string]string {
return nil
}
type AsyncApiResult interface {
ApiResult
RetrieveStatus(ctx context.Context, request ApiRequest, result ApiResult) error
}
type AsyncBaseResult struct {
Client *OpsGenieClient
}
func (ar *AsyncBaseResult) RetrieveStatus(ctx context.Context, request ApiRequest, result ApiResult) error {
if ctx == nil {
ctx = context.Background()
}
for i := 0; ; i++ {
err := ar.Client.Exec(ctx, request, result)
if err != nil {
apiErr, ok := err.(*ApiError)
if !ok ||
apiErr.StatusCode != 404 ||
apiErr.ErrorHeader != "RequestNotProcessed" ||
i >= ar.Client.RetryableClient.RetryMax {
return err
}
} else {
return nil
}
wait := retryablehttp.DefaultBackoff(
ar.Client.RetryableClient.RetryWaitMin,
ar.Client.RetryableClient.RetryWaitMax,
i, nil)
select {
case <-ctx.Done():
return ctx.Err()
case <-time.After(wait):
}
}
}
type ApiResult interface {
Parse(response *http.Response, result ApiResult) error
ValidateResultMetadata() error
setResultMetadata(metadata *ResultMetadata) *ResultMetadata
}
type ResultMetadata struct {
RequestId string `json:"requestId"`
ResponseTime float32 `json:"took"`
RateLimitState string
RateLimitReason string
RateLimitPeriod string
RetryCount int
}
func (rm *ResultMetadata) setResultMetadata(metadata *ResultMetadata) *ResultMetadata {
if len(metadata.RequestId) > 0 {
rm.RequestId = metadata.RequestId
}
if metadata.ResponseTime != 0 {
rm.ResponseTime = metadata.ResponseTime
}
rm.RateLimitState = metadata.RateLimitState
rm.RateLimitReason = metadata.RateLimitReason
rm.RateLimitPeriod = metadata.RateLimitPeriod
rm.RetryCount = metadata.RetryCount
return rm
}
func (rm *ResultMetadata) ValidateResultMetadata() error {
unsetFields := ""
if len(rm.RequestId) == 0 {
unsetFields = " requestId,"
}
if len(rm.RateLimitState) == 0 {
unsetFields = unsetFields + " rate limit state,"
}
if rm.ResponseTime == 0 {
unsetFields = unsetFields + " response time,"
}
if unsetFields != "" {
unsetFields = unsetFields[:len(unsetFields)-1] + "."
return errors.New("Could not set" + unsetFields)
}
return nil
}
var UserAgentHeader string
const Version = "2.0.0"
func setConfiguration(opsGenieClient *OpsGenieClient, cfg *Config) {
opsGenieClient.RetryableClient.ErrorHandler = opsGenieClient.defineErrorHandler
if cfg.OpsGenieAPIURL == "" {
cfg.OpsGenieAPIURL = API_URL
}
if cfg.HttpClient != nil {
opsGenieClient.RetryableClient.HTTPClient = cfg.HttpClient
}
if cfg.RequestTimeout != 0 {
opsGenieClient.RetryableClient.HTTPClient.Timeout = cfg.RequestTimeout
}
if cfg.ProxyConfiguration != nil {
setProxySettings(opsGenieClient)
}
opsGenieClient.Config.apiUrl = string(cfg.OpsGenieAPIURL)
}
func setLogger(conf *Config) {
if conf.Logger == nil {
conf.Logger = logrus.New()
if conf.LogLevel != (logrus.Level(0)) { // todo fix panic level
conf.Logger.SetLevel(conf.LogLevel)
}
conf.Logger.SetFormatter(
&logrus.TextFormatter{
ForceColors: true,
FullTimestamp: true,
TimestampFormat: time.RFC3339Nano,
},
)
}
}
func setRetryPolicy(opsGenieClient *OpsGenieClient, cfg *Config) {
//custom backoff
if cfg.Backoff != nil {
opsGenieClient.RetryableClient.Backoff = cfg.Backoff
}
//custom retry policy
if cfg.RetryPolicy != nil {
opsGenieClient.RetryableClient.CheckRetry = cfg.RetryPolicy
} else {
opsGenieClient.RetryableClient.CheckRetry = func(ctx context.Context, resp *http.Response, err error) (b bool, e error) {
if ctx.Err() != nil {
return false, ctx.Err()
}
if err != nil {
return true, err
}
// Check the response code. We retry on 500-range responses to allow
// the server time to recover, as 500's are typically not permanent
// errors and may relate to outages on the server side. This will catch
// invalid response codes as well, like 0 and 999.
if resp.StatusCode == 0 || (resp.StatusCode >= 500 && resp.StatusCode != 501) {
return true, nil
}
if resp.StatusCode == 429 {
return true, nil
}
return false, nil
}
}
if cfg.RetryCount != 0 {
opsGenieClient.RetryableClient.RetryMax = cfg.RetryCount
} else {
opsGenieClient.RetryableClient.RetryMax = 4
}
}
func NewOpsGenieClient(cfg *Config) (*OpsGenieClient, error) {
UserAgentHeader = fmt.Sprintf("opsgenie-go-sdk-%s %s (%s/%s)", Version, runtime.Version(), runtime.GOOS, runtime.GOARCH)
opsGenieClient := &OpsGenieClient{
Config: cfg,
RetryableClient: retryablehttp.NewClient(),
}
if cfg.Validate() != nil {
return nil, cfg.Validate()
}
setConfiguration(opsGenieClient, cfg)
opsGenieClient.RetryableClient.Logger = nil //disable retryableClient's uncustomizable logging
setLogger(cfg)
setRetryPolicy(opsGenieClient, cfg)
printInfoLog(opsGenieClient)
return opsGenieClient, nil
}
func printInfoLog(client *OpsGenieClient) {
client.Config.Logger.Infof("Client is configured with ApiUrl: %s, LogLevel: %s, RetryMaxCount: %v",
client.Config.OpsGenieAPIURL,
client.Config.Logger.GetLevel().String(),
client.RetryableClient.RetryMax)
}
func (cli *OpsGenieClient) defineErrorHandler(resp *http.Response, err error, numTries int) (*http.Response, error) {
if err != nil {
cli.Config.Logger.Errorf("Unable to send the request %s ", err.Error())
if err == context.DeadlineExceeded {
return nil, err
}
return nil, err
}
resp.Header.Add("retryCount", strconv.Itoa(numTries))
cli.Config.Logger.Errorf("Failed to process request after %d attempts.", numTries)
return resp, nil
}
func (cli *OpsGenieClient) do(request *request) (*http.Response, error) {
return cli.RetryableClient.Do(request.Request)
}
func setResultMetadata(httpResponse *http.Response, result ApiResult) *ResultMetadata {
responseTime := httpResponse.Header.Get("X-Response-Time")
retryCount, err := strconv.Atoi(httpResponse.Header.Get("retryCount"))
responseTimeInFloat, err2 := strconv.ParseFloat(responseTime, 32)
resultMetadata := &ResultMetadata{
RequestId: httpResponse.Header.Get("X-Request-Id"),
RateLimitState: httpResponse.Header.Get("X-RateLimit-State"),
RateLimitReason: httpResponse.Header.Get("X-RateLimit-Reason"),
RateLimitPeriod: httpResponse.Header.Get("X-RateLimit-Period-In-Sec"),
}
if err == nil {
resultMetadata.RetryCount = retryCount
}
if err2 == nil {
resultMetadata.ResponseTime = float32(responseTimeInFloat)
}
return result.setResultMetadata(resultMetadata)
}
type ApiError struct {
error
Message string `json:"message"`
Took float32 `json:"took"`
RequestId string `json:"requestId"`
Errors map[string]string `json:"errors"`
StatusCode int
ErrorHeader string
}
func (ar *ApiError) Error() string {
errMessage := "Error occurred with Status code: " + strconv.Itoa(ar.StatusCode) + ", " +
"Message: " + ar.Message + ", " +
"Took: " + fmt.Sprintf("%f", ar.Took) + ", " +
"RequestId: " + ar.RequestId
if ar.ErrorHeader != "" {
errMessage = errMessage + ", Error Header: " + ar.ErrorHeader
}
if ar.Errors != nil {
errMessage = errMessage + ", Error Detail: " + fmt.Sprintf("%v", ar.Errors)
}
return errMessage
}
func handleErrorIfExist(response *http.Response) error {
if response != nil && response.StatusCode >= 400 {
apiError := &ApiError{}
apiError.StatusCode = response.StatusCode
apiError.ErrorHeader = response.Header.Get("X-Opsgenie-Errortype")
body, _ := ioutil.ReadAll(response.Body)
json.Unmarshal(body, apiError)
return apiError
}
return nil
}
func (cli *OpsGenieClient) buildHttpRequest(apiRequest ApiRequest) (*request, error) {
var buf io.ReadWriter
var contentType = new(string)
var err error
var req = new(retryablehttp.Request)
details := apiRequest.Metadata(apiRequest)
if values, ok := details["form-data-values"].(map[string]io.Reader); ok {
setBodyAsFormData(&buf, values, contentType)
} else if apiRequest.Method() != http.MethodGet && apiRequest.Method() != http.MethodDelete {
err = setBodyAsJson(&buf, apiRequest, contentType, details)
}
if err != nil {
return nil, err
}
queryParams := url.Values{}
for key, value := range apiRequest.RequestParams() {
queryParams.Add(key, value)
}
req, err = retryablehttp.NewRequest(apiRequest.Method(), buildRequestUrl(cli, apiRequest, queryParams), buf)
if err != nil {
return nil, err
}
if contentType != nil {
req.Header.Add("Content-Type", *contentType)
} else {
req.Header.Add("Content-Type", "application/json")
}
req.Header.Add("Accept", "application/json")
req.Header.Add("Authorization", "GenieKey "+cli.Config.ApiKey)
req.Header.Add("User-Agent", UserAgentHeader)
return &request{req}, err
}
func buildRequestUrl(cli *OpsGenieClient, apiRequest ApiRequest, queryParams url.Values) string {
requestUrl := url.URL{
Scheme: string(Https),
Host: cli.Config.apiUrl,
Path: apiRequest.ResourcePath(),
RawQuery: queryParams.Encode(),
}
//test purposes only
if !strings.Contains(cli.Config.apiUrl, "api") {
requestUrl.Scheme = "http"
}
//
return requestUrl.String()
}
func setProxySettings(cli *OpsGenieClient) {
proxy := cli.Config.ProxyConfiguration.Host
if cli.Config.ProxyConfiguration.Port != 0 {
proxy = proxy + ":" + strconv.Itoa(cli.Config.ProxyConfiguration.Port)
}
proxyUrl := &url.URL{
Host: proxy,
Scheme: string(cli.Config.ProxyConfiguration.Protocol),
}
if cli.Config.ProxyConfiguration.Username != "" {
proxyUrl.User = url.UserPassword(cli.Config.ProxyConfiguration.Username, cli.Config.ProxyConfiguration.Password)
}
cli.RetryableClient.HTTPClient.Transport = &http.Transport{
Proxy: http.ProxyURL(proxyUrl),
}
}
func setBodyAsJson(buf *io.ReadWriter, apiRequest ApiRequest, contentType *string, details map[string]interface{}) error {
*buf = new(bytes.Buffer)
*contentType = details["Content-Type"].(string)
err := json.NewEncoder(*buf).Encode(apiRequest)
if err != nil {
return err
}
return nil
}
func setBodyAsFormData(buf *io.ReadWriter, values map[string]io.Reader, contentType *string) error {
*buf = new(bytes.Buffer)
writer := multipart.NewWriter(*buf)
defer writer.Close()
for key, reader := range values {
var part io.Writer
var err error
if file, ok := reader.(*os.File); ok {
fileStat, err := file.Stat()
if err != nil {
return err
}
part, err = writer.CreateFormFile(key, fileStat.Name())
if err != nil {
return err
}
} else {
part, err = writer.CreateFormField(key)
if err != nil {
return err
}
}
io.Copy(part, reader)
}
*contentType = writer.FormDataContentType()
return nil
}
func (cli *OpsGenieClient) Exec(ctx context.Context, request ApiRequest, result ApiResult) error {
startTime := time.Now().UnixNano()
transactionId := generateTransactionId()
cli.Config.Logger.Debugf("Starting to process Request %+v: to send: %s", request, request.ResourcePath())
if err := request.Validate(); err != nil {
cli.Config.Logger.Errorf("Request validation err: %s ", err.Error())
metricPublisher.publish(buildSdkMetric(transactionId, request.ResourcePath(), "request-validation-error", err, request, result, duration(startTime, time.Now().UnixNano())))
return err
}
req, err := cli.buildHttpRequest(request)
if err != nil {
cli.Config.Logger.Errorf("Could not create request: %s", err.Error())
metricPublisher.publish(buildSdkMetric(transactionId, request.ResourcePath(), "sdk-error", err, request, result, duration(startTime, time.Now().UnixNano())))
return err
}
if ctx != nil {
req.WithContext(ctx)
}
response, err := cli.do(req)
if response != nil {
metricPublisher.publish(buildHttpMetric(transactionId, request.ResourcePath(), response, err, duration(startTime, time.Now().UnixNano()), *req))
}
if err != nil {
cli.Config.Logger.Errorf(err.Error())
return err
}
defer response.Body.Close()
err = handleErrorIfExist(response)
if err != nil {
cli.Config.Logger.Errorf(err.Error())
metricPublisher.publish(buildApiMetric(transactionId, request.ResourcePath(), duration(startTime, time.Now().UnixNano()), *setResultMetadata(response, result), response, err))
metricPublisher.publish(buildSdkMetric(transactionId, request.ResourcePath(), "api-error", err, request, result, duration(startTime, time.Now().UnixNano())))
return err
}
err = result.Parse(response, result)
if err != nil {
cli.Config.Logger.Errorf(err.Error())
metricPublisher.publish(buildSdkMetric(transactionId, request.ResourcePath(), "http-response-parsing-error", err, request, result, duration(startTime, time.Now().UnixNano())))
return err
}
rm := setResultMetadata(response, result)
metricPublisher.publish(buildApiMetric(transactionId, request.ResourcePath(), duration(startTime, time.Now().UnixNano()), *rm, response, nil))
err = result.ValidateResultMetadata()
if err != nil {
cli.Config.Logger.Warn(err.Error())
}
metricPublisher.publish(buildSdkMetric(transactionId, request.ResourcePath(), "", nil, request, result, duration(startTime, time.Now().UnixNano())))
cli.Config.Logger.Debugf("Request processed. The result: %+v", result)
return nil
}
func shouldDataIgnored(result ApiResult) bool {
resultType := reflect.TypeOf(result)
elem := resultType.Elem()
for i := 0; i < elem.NumField(); i++ {
field := elem.Field(i)
if strings.Contains(field.Tag.Get("json"), "data") {
return false
}
}
return true
}
func (rm *ResultMetadata) Parse(response *http.Response, result ApiResult) error {
var payload []byte
if response == nil {
return errors.New("No response received")
}
body, err := ioutil.ReadAll(response.Body)
if err != nil {
return err
}
payload = body
if shouldDataIgnored(result) {
resultMap := make(map[string]interface{})
err = json.Unmarshal(body, &resultMap)
if err != nil {
return handleParsingErrors(err)
}
if value, ok := resultMap["data"]; ok {
payload, err = json.Marshal(value)
if err != nil {
return handleParsingErrors(err)
}
}
}
err = json.Unmarshal(payload, result)
if err != nil {
return handleParsingErrors(err)
}
return nil
}
func handleParsingErrors(err error) error {
message := "Response could not be parsed, " + err.Error()
return errors.New(message)
}