forked from golang/gddo
/
background.go
132 lines (117 loc) · 3.14 KB
/
background.go
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// Copyright 2013 The Go Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd.
package main
import (
"flag"
"log"
"time"
"google.golang.org/appengine"
"github.com/golang/gddo/database"
"github.com/golang/gddo/gosrc"
)
var backgroundTasks = []*struct {
name string
fn func() error
interval *time.Duration
next time.Time
}{
{
name: "GitHub updates",
fn: readGitHubUpdates,
interval: flag.Duration("github_interval", 0, "Github updates crawler sleeps for this duration between fetches. Zero disables the crawler."),
},
{
name: "Crawl",
fn: doCrawl,
interval: flag.Duration("crawl_interval", 0, "Package updater sleeps for this duration between package updates. Zero disables updates."),
},
}
func runBackgroundTasks() {
defer log.Println("ERROR: Background exiting!")
sleep := time.Minute
for _, task := range backgroundTasks {
if *task.interval > 0 && sleep > *task.interval {
sleep = *task.interval
}
}
for {
for _, task := range backgroundTasks {
start := time.Now()
if *task.interval > 0 && start.After(task.next) {
if err := task.fn(); err != nil {
log.Printf("Task %s: %v", task.name, err)
}
task.next = time.Now().Add(*task.interval)
}
}
time.Sleep(sleep)
}
}
func doCrawl() error {
// Look for new package to crawl.
importPath, hasSubdirs, err := db.PopNewCrawl()
if err != nil {
log.Printf("db.PopNewCrawl() returned error %v", err)
return nil
}
if importPath != "" {
if pdoc, err := crawlDoc("new", importPath, nil, hasSubdirs, time.Time{}); pdoc == nil && err == nil {
if err := db.AddBadCrawl(importPath); err != nil {
log.Printf("ERROR db.AddBadCrawl(%q): %v", importPath, err)
}
}
return nil
}
// Crawl existing doc.
pdoc, pkgs, nextCrawl, err := db.Get("-")
if err != nil {
log.Printf("db.Get(\"-\") returned error %v", err)
return nil
}
if pdoc == nil || nextCrawl.After(time.Now()) {
return nil
}
if _, err = crawlDoc("crawl", pdoc.ImportPath, pdoc, len(pkgs) > 0, nextCrawl); err != nil {
// Touch package so that crawl advances to next package.
if err := db.SetNextCrawl(pdoc.ImportPath, time.Now().Add(*maxAge/3)); err != nil {
log.Printf("ERROR db.SetNextCrawl(%q): %v", pdoc.ImportPath, err)
}
}
return nil
}
func readGitHubUpdates() error {
const key = "gitHubUpdates"
var last string
if err := db.GetGob(key, &last); err != nil {
return err
}
last, names, err := gosrc.GetGitHubUpdates(httpClient, last)
if err != nil {
return err
}
for _, name := range names {
log.Printf("bump crawl github.com/%s", name)
if err := db.BumpCrawl("github.com/" + name); err != nil {
log.Println("ERROR force crawl:", err)
}
}
if err := db.PutGob(key, last); err != nil {
return err
}
return nil
}
func reindex() {
c := appengine.BackgroundContext()
if err := db.Reindex(c); err != nil {
log.Println("reindex:", err)
}
}
func purgeIndex() {
c := appengine.BackgroundContext()
if err := database.PurgeIndex(c); err != nil {
log.Println("purgeIndex:", err)
}
}