client: add golang examples for KeysAPI

client/example_keys_test.go

@@ -0,0 +1,91 @@
+// Copyright 2017 The etcd Authors
+//
+// 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
+//
+//     http://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 client_test
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/coreos/etcd/client"
+	"golang.org/x/net/context"
+)
+
+func ExampleKeysAPI_directory() {
+	c, err := client.New(client.Config{
+		Endpoints: exampleEndpoints,
+		Transport: exampleTransport,
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	kapi := client.NewKeysAPI(c)
+
+	// Setting '/myNodes' to create a directory that will hold some keys.
+	o := client.SetOptions{Dir: true}
+	resp, err := kapi.Set(context.Background(), "/myNodes", "", &o)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Add keys to /myNodes directory.
+	resp, err = kapi.Set(context.Background(), "/myNodes/key1", "value1", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	resp, err = kapi.Set(context.Background(), "/myNodes/key2", "value2", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// fetch directory
+	resp, err = kapi.Get(context.Background(), "/myNodes", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	// print directory keys
+	for _, n := range resp.Node.Nodes {
+		fmt.Printf("Key: %q, Value: %q\n", n.Key, n.Value)
+	}
+
+	// Output:
+	// Key: "/myNodes/key1", Value: "value1"
+	// Key: "/myNodes/key2", Value: "value2"
+}
+
+func ExampleKeysAPI_setget() {
+	c, err := client.New(client.Config{
+		Endpoints: exampleEndpoints,
+		Transport: exampleTransport,
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	kapi := client.NewKeysAPI(c)
+
+	// Set key "/foo" to value "bar".
+	resp, err := kapi.Set(context.Background(), "/foo", "bar", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	// Get key "/foo"
+	resp, err = kapi.Get(context.Background(), "/foo", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Printf("%q key has %q value\n", resp.Node.Key, resp.Node.Value)
+
+	// Output: "/foo" key has "bar" value
+}

client/main_test.go

@@ -0,0 +1,77 @@
+// Copyright 2017 The etcd Authors
+//
+// 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
+//
+//     http://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 client_test
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"regexp"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/coreos/etcd/integration"
+	"github.com/coreos/etcd/pkg/testutil"
+	"github.com/coreos/etcd/pkg/transport"
+)
+
+var exampleEndpoints []string
+var exampleTransport *http.Transport
+
+// TestMain sets up an etcd cluster if running the examples.
+func TestMain(m *testing.M) {
+	useCluster, hasRunArg := false, false // default to running only Test*
+	for _, arg := range os.Args {
+		if strings.HasPrefix(arg, "-test.run=") {
+			exp := strings.Split(arg, "=")[1]
+			match, err := regexp.MatchString(exp, "Example")
+			useCluster = (err == nil && match) || strings.Contains(exp, "Example")
+			hasRunArg = true
+			break
+		}
+	}
+	if !hasRunArg {
+		// force only running Test* if no args given to avoid leak false
+		// positives from having a long-running cluster for the examples.
+		os.Args = append(os.Args, "-test.run=Test")
+	}
+
+	v := 0
+	if useCluster {
+		tr, trerr := transport.NewTransport(transport.TLSInfo{}, time.Second)
+		if trerr != nil {
+			fmt.Fprintf(os.Stderr, "%v", trerr)
+			os.Exit(1)
+		}
+		cfg := integration.ClusterConfig{Size: 1}
+		clus := integration.NewClusterV3(nil, &cfg)
+		exampleEndpoints = []string{clus.Members[0].URL()}
+		exampleTransport = tr
+		v = m.Run()
+		clus.Terminate(nil)
+		if err := testutil.CheckAfterTest(time.Second); err != nil {
+			fmt.Fprintf(os.Stderr, "%v", err)
+			os.Exit(1)
+		}
+	} else {
+		v = m.Run()
+	}
+
+	if v == 0 && testutil.CheckLeakedGoroutine() {
+		os.Exit(1)
+	}
+	os.Exit(v)
+}