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141package blogplus
import (
"container/heap"
"fmt"
"log"
"net/http"
"sort"
"strings"
"sync"
)
type Storage interface {
SetFilter(func(Activity) bool)
StorePosts(req *http.Request, posts []Activity)
GetLatestPosts(req *http.Request) []Activity
GetPost(req *http.Request, activityId string) (Activity, bool)
GetDates(req *http.Request) []ArchiveItem
GetArchivedPosts(req *http.Request, datespec string) []Activity
}
type ArchiveItem struct {
Datespec string
Count int
}
type ArchiveItemList []ArchiveItem
func (a ArchiveItemList) Len() int { return len(a) }
func (a ArchiveItemList) Less(i, j int) bool {
return a[i].Datespec > a[j].Datespec
}
func (a ArchiveItemList) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
type latestActivityList struct {
a []Activity
}
func (l *latestActivityList) Len() int { return len(l.a) }
func (l *latestActivityList) Less(i, j int) bool {
return l.a[i].Published > l.a[j].Published
}
func (l *latestActivityList) Swap(i, j int) { l.a[i], l.a[j] = l.a[j], l.a[i] }
func (l *latestActivityList) Push(x interface{}) {
l.a = append(l.a, x.(Activity))
}
func (l *latestActivityList) Pop() interface{} {
r := l.a[len(l.a)-1]
l.a = l.a[:len(l.a)-1]
return r
}
type MemStorage struct {
m map[string]Activity // activityid -> post
a map[string][]Activity // datespec -> list of post
h latestActivityList
filter func(Activity) bool
mu sync.Mutex
}
func NewMemStorage() *MemStorage {
s := &MemStorage{
m: make(map[string]Activity),
a: make(map[string][]Activity)}
heap.Init(&s.h)
return s
}
func (s *MemStorage) SetFilter(filter func(Activity) bool) {
s.filter = filter
}
func GetDatespec(published string) string {
s := strings.Split(published, "-")
if len(s) >= 2 {
return fmt.Sprintf("%s-%s", s[0], s[1])
}
return ""
}
func (s *MemStorage) StorePosts(req *http.Request, posts []Activity) {
s.mu.Lock()
defer s.mu.Unlock()
for _, post := range posts {
if s.filter != nil && !s.filter(post) {
continue
}
log.Printf("store: %s\n", post.Id)
s.m[post.Id] = post
updated := false
datespec := GetDatespec(post.Published)
for i, p := range s.a[datespec] {
if p.Id == post.Id {
s.a[datespec][i] = post
updated = true
break
}
}
if !updated {
s.a[datespec] = append(s.a[datespec], post)
}
heap.Push(&s.h, post)
if s.h.Len() >= 10 {
_ = heap.Remove(&s.h, s.h.Len()-1)
}
}
}
func (s *MemStorage) GetLatestPosts(req *http.Request) []Activity {
s.mu.Lock()
defer s.mu.Unlock()
return s.h.a
}
func (s *MemStorage) GetPost(req *http.Request, activityId string) (Activity, bool) {
s.mu.Lock()
defer s.mu.Unlock()
a, ok := s.m[activityId]
return a, ok
}
func (s *MemStorage) GetDates(req *http.Request) []ArchiveItem {
s.mu.Lock()
defer s.mu.Unlock()
var a ArchiveItemList
for datespec, l := range s.a {
a = append(a, ArchiveItem{Datespec: datespec, Count: len(l)})
}
sort.Sort(a)
return a
}
func (s *MemStorage) GetArchivedPosts(req *http.Request, datespec string) []Activity {
s.mu.Lock()
defer s.mu.Unlock()
if l, found := s.a[datespec]; found {
return l
}
return nil
}