mirror of https://github.com/perkeep/perkeep.git
109 lines
2.6 KiB
Go
109 lines
2.6 KiB
Go
// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package iterator_test
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import (
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"bytes"
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"fmt"
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"html/template"
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"log"
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"net/http"
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"golang.org/x/net/context"
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"google.golang.org/api/iterator"
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)
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var (
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client *Client
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ctx = context.Background()
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)
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var pageTemplate = template.Must(template.New("").Parse(`
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<table>
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{{range .Entries}}
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<tr><td>{{.}}</td></tr>
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{{end}}
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</table>
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{{with .Next}}
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<a href="/entries?pageToken={{.}}">Next Page</a>
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{{end}}
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`))
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// This example demonstrates how to use Pager to support
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// pagination on a web site.
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func Example_webHandler(w http.ResponseWriter, r *http.Request) {
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const pageSize = 25
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it := client.Items(ctx)
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var items []int
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pageToken, err := iterator.NewPager(it, pageSize, r.URL.Query().Get("pageToken")).NextPage(&items)
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if err != nil {
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http.Error(w, fmt.Sprintf("getting next page: %v", err), http.StatusInternalServerError)
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}
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data := struct {
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Items []int
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Next string
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}{
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items,
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pageToken,
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}
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var buf bytes.Buffer
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if err := pageTemplate.Execute(&buf, data); err != nil {
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http.Error(w, fmt.Sprintf("executing page template: %v", err), http.StatusInternalServerError)
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}
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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if _, err := buf.WriteTo(w); err != nil {
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log.Printf("writing response: %v", err)
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}
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}
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// This example demonstrates how to use a Pager to page through an iterator in a loop.
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func Example_pageLoop() {
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const pageSize = 25
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ctx := context.Background()
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p := iterator.NewPager(client.Items(ctx), pageSize, "" /* start from the beginning */)
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for {
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var items []int
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pageToken, err := p.NextPage(&items)
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if err != nil {
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// TODO: handle error.
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}
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fmt.Println(items)
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if pageToken == "" {
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break
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}
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}
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}
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// This example demonstrates how to get exactly the items in the buffer, without
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// triggering an extra RPC.
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func Example_serverPages() {
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it := client.Items(ctx)
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var items []int
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for {
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item, err := it.Next()
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if err != nil && err != iterator.Done {
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log.Fatal(err)
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}
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if err == iterator.Done {
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break
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}
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items = append(items, item)
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if it.PageInfo().Remaining() == 0 {
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break
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}
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}
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fmt.Println(items)
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}
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