func (i *thumbInventory) AddTag(tag string) chan bool {
i.mu.Lock()
defer i.mu.Unlock()
// Initialize the inventory.
if _, ok := i.images[tag]; !ok {
cache := i.tagCacheFunc(tag)
i.images[tag] = mosaic.NewImageInventory(cache)
}
inv := i.images[tag]
// Initialize the state.
if ch, ok := i.states[tag]; ok {
log.Printf("AddTag(%s) already has it\n", tag)
return ch
}
i.states[tag] = make(chan bool)
log.Printf("AddTag(%s) beginning fetch\n", tag)
go func() {
fetcher := instagram.NewTagFetcher(i.api, tag)
if err := inv.Fetch(fetcher, ImagesPerTag); err != nil {
log.Printf("Failed to fetch tag %s: %s", tag, err)
}
close(i.states[tag])
}()
return i.states[tag]
}
func newInventory(dir string) *mosaic.ImageInventory {
cache := mosaic.NewFileImageCache(dir)
return mosaic.NewImageInventory(cache)
}