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// Copyright 2020 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package main
import (
"fmt"
"net/http"
"time"
"golang.org/x/net/context"
"google.golang.org/appengine/v2"
"google.golang.org/appengine/v2/log"
"google.golang.org/appengine/v2/memcache"
)
type Cached struct {
Open int
Fixed int
Invalid int
}
func CacheGet(c context.Context, r *http.Request, ns string) (*Cached, error) {
accessLevel := accessLevel(c, r)
v := new(Cached)
_, err := memcache.Gob.Get(c, cacheKey(ns, accessLevel), v)
if err != nil && err != memcache.ErrCacheMiss {
return nil, err
}
if err == nil {
return v, nil
}
bugs, _, err := loadNamespaceBugs(c, ns)
if err != nil {
return nil, err
}
return buildAndStoreCached(c, bugs, ns, accessLevel)
}
// cacheUpdate updates memcache every hour (called by cron.yaml).
// Cache update is slow and we don't want to slow down user requests.
func cacheUpdate(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
for ns := range config.Namespaces {
bugs, _, err := loadNamespaceBugs(c, ns)
if err != nil {
log.Errorf(c, "failed load ns=%v bugs: %v", ns, err)
continue
}
for _, accessLevel := range []AccessLevel{AccessPublic, AccessUser, AccessAdmin} {
_, err := buildAndStoreCached(c, bugs, ns, accessLevel)
if err != nil {
log.Errorf(c, "failed to build cached for ns=%v access=%v: %v", ns, accessLevel, err)
continue
}
}
}
}
func buildAndStoreCached(c context.Context, bugs []*Bug, ns string, accessLevel AccessLevel) (*Cached, error) {
v := &Cached{}
for _, bug := range bugs {
switch bug.Status {
case BugStatusOpen:
if accessLevel < bug.sanitizeAccess(accessLevel) {
continue
}
if len(bug.Commits) == 0 {
v.Open++
} else {
v.Fixed++
}
case BugStatusFixed:
v.Fixed++
case BugStatusInvalid:
v.Invalid++
}
}
item := &memcache.Item{
Key: cacheKey(ns, accessLevel),
Object: v,
Expiration: 4 * time.Hour, // supposed to be updated by cron every hour
}
if err := memcache.Gob.Set(c, item); err != nil {
return nil, err
}
return v, nil
}
func cacheKey(ns string, accessLevel AccessLevel) string {
return fmt.Sprintf("%v-%v", ns, accessLevel)
}
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