| // Copyright 2016 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 |
| // |
| // 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 logadmin_test |
| |
| import ( |
| "bytes" |
| "context" |
| "flag" |
| "fmt" |
| "html/template" |
| "log" |
| "net/http" |
| |
| "cloud.google.com/go/logging" |
| "cloud.google.com/go/logging/logadmin" |
| "google.golang.org/api/iterator" |
| ) |
| |
| var ( |
| client *logadmin.Client |
| projectID = flag.String("project-id", "", "ID of the project to use") |
| ) |
| |
| func ExampleClient_Entries_pagination() { |
| // This example demonstrates how to iterate through items a page at a time |
| // even if each successive page is fetched by a different process. It is a |
| // complete web server that displays pages of log entries. To run it as a |
| // standalone program, rename both the package and this function to "main". |
| ctx := context.Background() |
| flag.Parse() |
| if *projectID == "" { |
| log.Fatal("-project-id missing") |
| } |
| var err error |
| client, err = logadmin.NewClient(ctx, *projectID) |
| if err != nil { |
| log.Fatalf("creating logging client: %v", err) |
| } |
| |
| http.HandleFunc("/entries", handleEntries) |
| log.Print("listening on 8080") |
| log.Fatal(http.ListenAndServe(":8080", nil)) |
| } |
| |
| var pageTemplate = template.Must(template.New("").Parse(` |
| <table> |
| {{range .Entries}} |
| <tr><td>{{.}}</td></tr> |
| {{end}} |
| </table> |
| {{if .Next}} |
| <a href="/entries?pageToken={{.Next}}">Next Page</a> |
| {{end}} |
| `)) |
| |
| func handleEntries(w http.ResponseWriter, r *http.Request) { |
| ctx := context.Background() |
| filter := fmt.Sprintf(`logName = "projects/%s/logs/testlog"`, *projectID) |
| it := client.Entries(ctx, logadmin.Filter(filter)) |
| var entries []*logging.Entry |
| nextTok, err := iterator.NewPager(it, 5, r.URL.Query().Get("pageToken")).NextPage(&entries) |
| if err != nil { |
| http.Error(w, fmt.Sprintf("problem getting the next page: %v", err), http.StatusInternalServerError) |
| return |
| } |
| data := struct { |
| Entries []*logging.Entry |
| Next string |
| }{ |
| entries, |
| nextTok, |
| } |
| var buf bytes.Buffer |
| if err := pageTemplate.Execute(&buf, data); err != nil { |
| http.Error(w, fmt.Sprintf("problem executing page template: %v", err), http.StatusInternalServerError) |
| } |
| if _, err := buf.WriteTo(w); err != nil { |
| log.Printf("writing response: %v", err) |
| } |
| } |