vision: add set_endpoint sample (#1113)

Author: davidcavazos

vision/detect/set_endpoint.go

@@ -0,0 +1,40 @@
+// Copyright 2019 Google LLC
+//
+// 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
+//
+//     https://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 main
+
+// [START vision_set_endpoint]
+import (
+	"context"
+	"fmt"
+
+	vision "cloud.google.com/go/vision/apiv1"
+	"google.golang.org/api/option"
+)
+
+// setEndpoint changes your endpoint.
+func setEndpoint(endpoint string) error {
+	// endpoint := "eu-vision.googleapis.com:443"
+
+	ctx := context.Background()
+	client, err := vision.NewImageAnnotatorClient(ctx, option.WithEndpoint(endpoint))
+	if err != nil {
+		return fmt.Errorf("NewImageAnnotatorClient: %v", err)
+	}
+	defer client.Close()
+
+	return nil
+}
+
+// [END vision_set_endpoint]

vision/detect/set_endpoint_test.go

@@ -0,0 +1,61 @@
+// Copyright 2019 Google LLC
+//
+// 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
+//
+//     https://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 main
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	vision "cloud.google.com/go/vision/apiv1"
+	"google.golang.org/api/option"
+	visionpb "google.golang.org/genproto/googleapis/cloud/vision/v1"
+)
+
+func TestSetEndpoint(t *testing.T) {
+	const endpoint = "eu-vision.googleapis.com:443"
+
+	// Run the code sample to check for errors.
+	err := setEndpoint(endpoint)
+	if err != nil {
+		t.Fatalf("setEndpoint: %v", err)
+	}
+
+	// Since we're not returning the client from the code sample, we create an equivalent client here.
+	ctx := context.Background()
+	client, err := vision.NewImageAnnotatorClient(ctx, option.WithEndpoint(endpoint))
+	if err != nil {
+		t.Fatalf("NewImageAnnotatorClient: %v", err)
+	}
+	defer client.Close()
+
+	image := &visionpb.Image{
+		Source: &visionpb.ImageSource{
+			GcsImageUri: "gs://cloud-samples-data/vision/text/screen.jpg",
+		},
+	}
+	texts, err := client.DetectTexts(ctx, image, nil, 1)
+	if err != nil {
+		t.Fatalf("DetectTexts: %v", err)
+	}
+
+	text := texts[0]
+	if got, want := text.GetDescription(), "System"; !strings.Contains(got, want) {
+		t.Errorf("text.GetDescription() got:\n----\n%s----\nWant to contain:\n----\n%s\n----", got, want)
+	}
+	if len(text.GetBoundingPoly().GetVertices()) == 0 {
+		t.Errorf("text.GetBoundingPoly().getVertices() must have at least one vertex")
+	}
+}