Adds a method to change config per subject

client.go

@@ -168,7 +168,7 @@ func (c *Client) IsRegistered(ctx context.Context, subject string, schema string
 
 	// nolint
 	// Error not possible here.
-	reqBody, _ := json.Marshal(&requestBody{Schema: schema})
+	reqBody, _ := json.Marshal(requestBody{Schema: schema})
 
 	rawBody, err := c.execRequest(ctx, "POST", fmt.Sprintf("subjects/%s", subject), bytes.NewReader(reqBody))
 	if IsSchemaNotFound(err) || IsSchemaNotFound(err) {
@@ -205,7 +205,7 @@ func (c *Client) RegisterNewSchema(ctx context.Context, subject string, avroSche
 
 	// nolint
 	// Error not possible here.
-	reqBody, _ := json.Marshal(&requestBody{Schema: avroSchema})
+	reqBody, _ := json.Marshal(requestBody{Schema: avroSchema})
 
 	rawBody, err := c.execRequest(ctx, "POST", fmt.Sprintf("subjects/%s/versions", subject), bytes.NewReader(reqBody))
 	if err != nil {
@@ -271,7 +271,7 @@ func (c *Client) GetConfig(ctx context.Context, subject string) (*Config, error)
 func (c *Client) SetGlobalConfig(ctx context.Context, config Config) (*Config, error) {
 	// nolint
 	// Error not possible here.
-	reqBody, _ := json.Marshal(&config)
+	reqBody, _ := json.Marshal(config)
 
 	rawBody, err := c.execRequest(ctx, "PUT", "config", bytes.NewReader(reqBody))
 	if err != nil {
@@ -287,6 +287,25 @@ func (c *Client) SetGlobalConfig(ctx context.Context, config Config) (*Config, e
 	return &newConfig, nil
 }
 
+func (c *Client) SetSubjectConfig(ctx context.Context, subject string, config Config) (*Config, error) {
+	// nolint
+	// Error not possible here.
+	reqBody, _ := json.Marshal(config)
+
+	rawBody, err := c.execRequest(ctx, "PUT", fmt.Sprintf("config/%s", subject), bytes.NewReader(reqBody))
+	if err != nil {
+		return nil, err
+	}
+
+	var newConfig Config
+	err = json.Unmarshal(rawBody, &newConfig)
+	if err != nil {
+		return nil, fmt.Errorf("failed to decode the response: %s", err)
+	}
+
+	return &newConfig, nil
+}
+
 func (c *Client) deleteSchemaVersion(ctx context.Context, subject string, version string, permanent bool) (int, error) {
 	rawBody, err := c.execRequest(ctx, "DELETE", fmt.Sprintf("subjects/%s/versions/%s?permanent=%v", subject, version, permanent), nil)
 	if err != nil {
@@ -344,7 +363,7 @@ func (c *Client) SchemaCompatibleWith(ctx context.Context, schema string, subjec
 
 	// nolint
 	// Error not possible here.
-	reqBody, _ := json.Marshal(&requestBody{Schema: schema})
+	reqBody, _ := json.Marshal(requestBody{Schema: schema})
 
 	rawBody, err := c.execRequest(ctx, "POST", fmt.Sprintf("compatibility/subjects/%s/versions/%d", subject, version), bytes.NewReader(reqBody))
 	if err != nil {

client_test.go

@@ -797,3 +797,49 @@ func Test_SetGlobalConfig_with_a_remote_error(t *testing.T) {
 	assert.Nil(t, config)
 	assert.EqualError(t, err, fmt.Sprintf("client: (PUT: %s/config) failed with error code 500: internal server error", ts.URL))
 }
+
+func Test_SetSubjectConfig_success(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, "PUT", r.Method)
+		assert.Equal(t, "/config/my-subject", r.URL.String())
+
+		w.WriteHeader(http.StatusOK)
+		_, err := w.Write([]byte(`{"compatibility": "BACKWARD"}`))
+		require.NoError(t, err)
+	}))
+	defer ts.Close()
+
+	client, err := NewClient(ts.URL)
+	require.NoError(t, err)
+
+	config, err := client.SetSubjectConfig(context.Background(), "my-subject", Config{
+		Compatibility: "BACKWARD",
+	})
+
+	assert.NoError(t, err)
+	assert.EqualValues(t, &Config{
+		Compatibility: "BACKWARD",
+	}, config)
+}
+
+func Test_SetSubjectConfig_remote_error(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusUnprocessableEntity)
+		_, err := w.Write([]byte(`{
+			"error_code": 500,
+			"message": "internal server error"
+		}`))
+		require.NoError(t, err)
+	}))
+	defer ts.Close()
+
+	client, err := NewClient(ts.URL)
+	require.NoError(t, err)
+
+	config, err := client.SetSubjectConfig(context.Background(), "my-subject", Config{
+		Compatibility: "BACKWARD",
+	})
+
+	assert.Nil(t, config)
+	assert.EqualError(t, err, fmt.Sprintf("client: (PUT: %s/config/my-subject) failed with error code 500: internal server error", ts.URL))
+}