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93 lines
2.7 KiB
Go
93 lines
2.7 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 logadmin_test
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import (
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"bytes"
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"flag"
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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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"cloud.google.com/go/logging"
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"cloud.google.com/go/logging/logadmin"
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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 *logadmin.Client
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projectID = flag.String("project-id", "", "ID of the project to use")
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)
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func ExampleClient_Entries_pagination() {
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// This example demonstrates how to iterate through items a page at a time
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// even if each successive page is fetched by a different process. It is a
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// complete web server that displays pages of log entries. To run it as a
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// standalone program, rename both the package and this function to "main".
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ctx := context.Background()
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flag.Parse()
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if *projectID == "" {
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log.Fatal("-project-id missing")
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}
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var err error
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client, err = logadmin.NewClient(ctx, *projectID)
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if err != nil {
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log.Fatalf("creating logging client: %v", err)
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}
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http.HandleFunc("/entries", handleEntries)
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log.Print("listening on 8080")
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log.Fatal(http.ListenAndServe(":8080", nil))
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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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{{if .Next}}
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<a href="/entries?pageToken={{.Next}}">Next Page</a>
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{{end}}
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`))
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func handleEntries(w http.ResponseWriter, r *http.Request) {
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ctx := context.Background()
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filter := fmt.Sprintf(`logName = "projects/%s/logs/testlog"`, *projectID)
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it := client.Entries(ctx, logadmin.Filter(filter))
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var entries []*logging.Entry
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nextTok, err := iterator.NewPager(it, 5, r.URL.Query().Get("pageToken")).NextPage(&entries)
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if err != nil {
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http.Error(w, fmt.Sprintf("problem getting the next page: %v", err), http.StatusInternalServerError)
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return
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}
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data := struct {
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Entries []*logging.Entry
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Next string
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}{
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entries,
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nextTok,
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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("problem executing page template: %v", err), http.StatusInternalServerError)
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}
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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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