feat: allow passing custom http client (#75)

Author: ngoduykhanh

eppoclient/config.go

@@ -2,6 +2,7 @@ package eppoclient
 
 import (
 	"fmt"
+	"net/http"
 	"time"
 
 	"go.uber.org/zap"
@@ -16,6 +17,7 @@ type Config struct {
 	AssignmentLogger  IAssignmentLogger
 	PollerInterval    time.Duration
 	ApplicationLogger ApplicationLogger
+	HttpClient        *http.Client
 }
 
 func (cfg *Config) validate() error {

eppoclient/initclient.go

@@ -14,7 +14,13 @@ func InitClient(config Config) (*EppoClient, error) {
 	sdkParams := SDKParams{sdkKey: config.SdkKey, sdkName: "go", sdkVersion: __version__}
 	applicationLogger := config.ApplicationLogger
 
-	httpClient := newHttpClient(config.BaseUrl, &http.Client{Timeout: REQUEST_TIMEOUT_SECONDS}, sdkParams)
+	var httpClientInstance *http.Client
+	if config.HttpClient != nil {
+		httpClientInstance = config.HttpClient
+	} else {
+		httpClientInstance = &http.Client{Timeout: REQUEST_TIMEOUT_SECONDS}
+	}
+	httpClient := newHttpClient(config.BaseUrl, httpClientInstance, sdkParams)
 	configStore := newConfigurationStore()
 	requestor := newConfigurationRequestor(*httpClient, configStore, applicationLogger)