Allow custom http.Client to be passed to SR client (#1099)

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* chore: update repo semaphore config

* Allow custom http.Client to be passed in to SR client

---------

Co-authored-by: Confluent Jenkins Bot <jenkins@confluent.io>

Author: rayokota

schemaregistry/config.go

@@ -16,7 +16,10 @@
 
 package schemaregistry
 
-import "fmt"
+import (
+	"fmt"
+	"net/http"
+)
 
 // Config is used to pass multiple configuration options to the Schema Registry client.
 type Config struct {
@@ -50,6 +53,9 @@ type Config struct {
 	RequestTimeoutMs int
 	// CacheCapacity positive integer or zero for unbounded capacity
 	CacheCapacity int
+
+	// HTTP client
+	HTTPClient *http.Client
 }
 
 // NewConfig returns a new configuration instance with sane defaults.

schemaregistry/rest_service.go

@@ -126,20 +126,24 @@ func newRestService(conf *Config) (*restService, error) {
 		return nil, err
 	}
 
-	transport, err := configureTransport(conf)
-	if err != nil {
-		return nil, err
-	}
+	if conf.HTTPClient == nil {
+		transport, err := configureTransport(conf)
+		if err != nil {
+			return nil, err
+		}
+
+		timeout := conf.RequestTimeoutMs
 
-	timeout := conf.RequestTimeoutMs
+		conf.HTTPClient = &http.Client{
+			Transport: transport,
+			Timeout:   time.Duration(timeout) * time.Millisecond,
+		}
+	}
 
 	return &restService{
 		url:     u,
 		headers: headers,
-		Client: &http.Client{
-			Transport: transport,
-			Timeout:   time.Duration(timeout) * time.Millisecond,
-		},
+		Client:  conf.HTTPClient,
 	}, nil
 }