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package cache
import (
"sync"
"github.com/Necoro/feed2imap-go/internal/feed"
"github.com/Necoro/feed2imap-go/pkg/config"
"github.com/Necoro/feed2imap-go/pkg/log"
)
type State struct {
feeds map[string]*feed.Feed
cachedFeeds map[string]CachedFeed
knownFeeds map[feed.Descriptor]struct{}
cache Cache
cfg *config.Config
}
func (state *State) Foreach(f func(CachedFeed)) {
for _, feed := range state.cachedFeeds {
f(feed)
}
}
func (state *State) ForeachGo(goFunc func(CachedFeed)) {
var wg sync.WaitGroup
wg.Add(len(state.cachedFeeds))
f := func(feed CachedFeed, wg *sync.WaitGroup) {
goFunc(feed)
wg.Done()
}
for _, feed := range state.cachedFeeds {
go f(feed, &wg)
}
wg.Wait()
}
func (state *State) LoadCache(fileName string, forceNew bool) error {
var (
cache Cache
err error
)
if forceNew {
cache, err = create()
} else {
cache, err = Load(fileName, true)
}
if err != nil {
return err
}
state.cache = cache
for name, feed := range state.feeds {
state.cachedFeeds[name] = cache.cachedFeed(feed)
state.knownFeeds[feed.Descriptor()] = struct{}{}
}
// state.feeds should not be used after loading the cache --> enforce a panic
state.feeds = nil
return nil
}
func (state *State) StoreCache(fileName string) error {
state.cache.cleanup(state.knownFeeds)
return state.cache.store(fileName)
}
func (state *State) UnlockCache() {
_ = state.cache.Unlock()
}
func (state *State) Fetch() int {
state.ForeachGo(handleFeed)
ctr := 0
for _, cf := range state.cachedFeeds {
success := cf.Feed().FetchSuccessful()
cf.Checked(!success)
if success {
ctr++
}
}
return ctr
}
func handleFeed(cf CachedFeed) {
feed := cf.Feed()
log.Printf("Fetching %s from %s", feed.Name, feed.Url)
err := feed.Parse()
if err != nil {
if feed.Url == "" || cf.Failures() >= feed.Global.MaxFailures {
log.Error(err)
} else {
log.Print(err)
}
}
}
func filterFeed(cf CachedFeed) {
cf.Feed().Filter(cf.Filter)
}
func (state *State) Filter() {
if log.IsDebug() {
// single threaded for better output
state.Foreach(filterFeed)
} else {
state.ForeachGo(filterFeed)
}
}
func NewState(cfg *config.Config) (*State, error) {
numFeeds := len(cfg.Feeds)
state := State{
feeds: make(map[string]*feed.Feed, numFeeds),
cachedFeeds: make(map[string]CachedFeed, numFeeds),
knownFeeds: make(map[feed.Descriptor]struct{}, numFeeds),
cache: Cache{}, // loaded later on
cfg: cfg,
}
for name, parsedFeed := range cfg.Feeds {
feed, err := feed.Create(parsedFeed, cfg.GlobalOptions)
if err != nil {
return nil, err
}
state.feeds[name] = feed
}
return &state, nil
}
func (state *State) RemoveUndue() {
for name, feed := range state.cachedFeeds {
if feed.Feed().Disable || !feed.Feed().NeedsUpdate(feed.Last()) {
delete(state.cachedFeeds, name)
}
}
}
func (state *State) NumFeeds() int {
return len(state.cachedFeeds)
}
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