forked from google/go-cloud
/
example_test.go
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/
example_test.go
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// Copyright 2018 The Go Cloud Development Kit 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
//
// 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 etcdvar_test
import (
"context"
"log"
"go.etcd.io/etcd/client/v3"
"gocloud.dev/runtimevar"
"gocloud.dev/runtimevar/etcdvar"
)
func ExampleOpenVariable() {
// PRAGMA: This example is used on gocloud.dev; PRAGMA comments adjust how it is shown and can be ignored.
// Connect to the etcd server.
client, err := clientv3.NewFromURL("http://your.etcd.server:9999")
if err != nil {
log.Fatal(err)
}
// Construct a *runtimevar.Variable that watches the variable.
v, err := etcdvar.OpenVariable(client, "cfg-variable-name", runtimevar.StringDecoder, nil)
if err != nil {
log.Fatal(err)
}
defer v.Close()
}
func Example_openVariableFromURL() {
// PRAGMA: This example is used on gocloud.dev; PRAGMA comments adjust how it is shown and can be ignored.
// PRAGMA: On gocloud.dev, add a blank import: _ "gocloud.dev/runtimevar/etcdvar"
// PRAGMA: On gocloud.dev, hide lines until the next blank line.
ctx := context.Background()
// runtimevar.OpenVariable creates a *runtimevar.Variable from a URL.
// The default opener connects to an etcd server based on the environment
// variable ETCD_SERVER_URL.
v, err := runtimevar.OpenVariable(ctx, "etcd://myvarname?decoder=string")
if err != nil {
log.Fatal(err)
}
defer v.Close()
}