func printLog(c appengine.Context, v string) {
if appengine.IsDevAppServer() {
log.Println(v)
} else {
c.Logf("%v", v)
}
}
func serveError(c appengine.Context, w http.ResponseWriter, err os.Error) {
w.WriteHeader(http.StatusInternalServerError)
w.Header().Set("Content-Type", "text/plain")
io.WriteString(w, "Internal Server Error")
c.Logf("%v", err)
}
func filterEdges(c appengine.Context, filename string, chrm string, start int, end int, filters []filter) ([]edge, os.Error) {
out := make([]edge, 0, 2)
indexname := fmt.Sprintf("%s.index.%s.json", filename, chrm)
c.Logf("attempting to load %s from m cache", indexname)
var indexjson []byte
switch indexitem, err := memcache.Get(c, indexname); {
case err == memcache.ErrCacheMiss:
c.Logf("item not in the cache")
q := datastore.NewQuery("fileNameToKey").Filter("Filename=", indexname)
blobs := make([]fileNameToKey, 0, 100)
if _, err := q.GetAll(c, &blobs); err != nil {
c.Logf("%v", err)
}
if len(blobs) == 0 {
return out, nil
}
c.Logf("blobs[0] is %v %v", blobs[0].Filename, blobs[0].BlobKey)
blobreader := blobstore.NewReader(c, blobs[0].BlobKey)
c.Logf("reading blob into indexjson")
c.Logf("indexjson is %v long before", len(indexjson))
var readerr os.Error
if indexjson, readerr = ioutil.ReadAll(blobreader); readerr != nil && readerr != os.EOF {
c.Logf("error loading json from blob: %v", readerr)
return out, readerr
}
item := &memcache.Item{Key: indexname,
Value: indexjson,
}
// Add the item to the memcache, if the key does not already exist
if err := memcache.Add(c, item); err == memcache.ErrNotStored {
c.Logf("item with key %q already exists", item.Key)
} else if err != nil {
c.Logf("error adding item: %v", err)
}
case err != nil:
c.Logf("error getting item: %v", err)
case err == nil:
c.Logf(" indexjson Loaded from memcache.")
indexjson = indexitem.Value
}
c.Logf("indexjson is %v long after", len(indexjson))
index := make([]edge, 0, 100)
if err := json.Unmarshal(indexjson, &index); err != nil {
c.Logf("error parseingjson: %v", err)
return out, err
}
if len(index) > 0 {
leftbound := bisect_left(index, start, 0, -1)
rightbound := bisect_right(index, end, 0, -1)
for i := leftbound; i < rightbound; i++ {
e := index[i]
includeme := false
if len(filters) > 0 {
for _, filter := range filters {
switch min, err := strconv.Atof32(filter.Minscore); {
case err != nil:
c.Logf("error parseing filter: %v", err)
case e.Type == filter.Type && e.Score >= min:
includeme = true
break
}
}
} else {
includeme = true
}
if includeme {
out = append(out, e)
}
}
}
return out, nil
}