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package fetchers
import (
"encoding/json"
"fmt"
"llostre/backend/auth"
"llostre/backend/general"
"llostre/backend/notes"
"log/slog"
)
func FetchAppBskyFeedPosts(logger *slog.Logger, did, pdsURL, slingshotURL string, session *auth.OAuthState, cache *Cache) ([]notes.Note, error) {
// get author of the note
author, found := cache.GetProfile(did)
var err error
if !found {
author, err = FetchAppBskyActorProfile(logger, did, pdsURL, slingshotURL, session, cache)
}
if err != nil {
return nil, err
}
// try slingshot first if given
if slingshotURL != "" {
records, err := general.FetchRawRecordCollection(logger, did, "app.bsky.feed.post", slingshotURL, session)
if err != nil {
logger.Error("Fetching from slingshot failed")
} else {
return parseAppBskyFeedPostCollection(logger, slingshotURL, session, records, author, cache)
}
}
records, err := general.FetchRawRecordCollection(logger, did, "app.bsky.feed.post", pdsURL, session)
if err != nil {
return nil, err
}
return parseAppBskyFeedPostCollection(logger, slingshotURL, session, records, author, cache)
}
func GetAppBskyFeedPostByURI(logger *slog.Logger, uri, slingshotURL string, session *auth.OAuthState, cache *Cache) (*notes.Note, error) {
// check cache, return if it was cached without auth or if it was cached with auth and we have auth
logger.Debug("Getting app.bsky.feed.post", "uri", uri)
if cached, found := cache.Get(uri); found {
logger.Debug("Found in the cache", "public", !cached.AuthorNoUnauth)
if !cached.AuthorNoUnauth {
return cached, nil
}
// author requires auth - if we have a session, serve it
// if the token was invalid, trust that it would have been caught by the "refresh token" call in main
if session != nil {
return cached, nil
}
}
return FetchAppBskyFeedPostByURI(logger, uri, slingshotURL, session, cache)
}
func FetchAppBskyFeedPostByURI(logger *slog.Logger, uri, slingshotURL string, session *auth.OAuthState, cache *Cache) (*notes.Note, error) {
repo, _, _, err := general.ParseURI(uri)
// need to resolve DID to PDS
pdsURL, err := FetchPDS(repo)
if err != nil {
return nil, err
}
logger.Debug("fetched origin PDS", "did", repo, "pdsURL", pdsURL)
// get author of the note
author, found := cache.GetProfile(repo)
if !found {
author, err = FetchAppBskyActorProfile(logger, repo, pdsURL, slingshotURL, session, cache)
}
if err != nil {
return nil, err
}
// try slingshot first if given
if slingshotURL != "" {
rawRecord, err := general.FetchRawRecordByURI(logger, uri, slingshotURL, session)
if err != nil {
logger.Error("fetching from slingshot failed", "error", err)
} else {
return parseAppBskyFeedPostRecord(rawRecord, author, cache)
}
}
rawRecord, err := general.FetchRawRecordByURI(logger, uri, pdsURL, session)
if err != nil {
logger.Error("Fetching from PDS failed")
return nil, err
}
return parseAppBskyFeedPostRecord(rawRecord, author, cache)
}
func parseAppBskyFeedPostRecord(rawRecord *general.RawRecord, author *notes.Author, cache *Cache) (*notes.Note, error) {
if rawRecord == nil {
return nil, fmt.Errorf("unable to parse nil record")
}
record := notes.AppBskyFeedPostRecord{
URI: rawRecord.URI,
}
err := json.Unmarshal(rawRecord.Value, &record.Value)
if err != nil {
return nil, err
}
note, err := notes.NoteFromAppBskyFeedPostRecord(record, author)
if err != nil {
return nil, err
}
// cache it
cache.Set(note.URI, note)
return note, nil
}
func parseAppBskyFeedPostCollection(logger *slog.Logger, slingshotURL string, session *auth.OAuthState, records []general.RawRecord, author *notes.Author, cache *Cache) ([]notes.Note, error) {
posts := make([]notes.Note, 0, len(records))
for _, record := range records {
note, err := parseAppBskyFeedPostRecord(&record, author, cache)
if err != nil {
logger.Error("failed to parse post record", "error", err)
continue
}
if note.ReplyTo != nil {
parents, err := FetchParents(logger, *note.ReplyTo, slingshotURL, session, cache, 10)
if err != nil {
logger.Warn("failed to fetch parent chain", "uri", note.URI, "error", err)
}
note.Parents = parents
}
cache.Set(note.URI, note)
posts = append(posts, *note)
}
return notes.DeduplicateThreads(posts), nil
}
func FetchParents(logger *slog.Logger, replyToURI string, slingshotURL string, session *auth.OAuthState, cache *Cache, maxDepth int) ([]notes.Note, error) {
parents := []notes.Note{}
currentURI := replyToURI
for currentURI != "" {
note, err := GetAppBskyFeedPostByURI(logger, currentURI, slingshotURL, session, cache)
if err != nil {
logger.Warn("failed to fetch parent", "uri", currentURI, "error", err)
note = notes.MissingNote(currentURI)
cache.Set(currentURI, note)
parents = append(parents, *note)
break
}
// preemptively fetch posts from author to avoid hammering servers if there's a back and forth
if _, found := cache.GetProfile(note.AuthorDID); !found {
logger.Debug("caching posts from thread participant", "did", note.AuthorDID)
authorPDS, err := FetchPDS(note.AuthorDID)
if err != nil {
logger.Warn("failed to fetch parent", "uri", currentURI, "error", err)
break
}
go FetchAppBskyFeedPosts(logger, note.AuthorDID, authorPDS, slingshotURL, session, cache)
}
parents = append(parents, *note)
if note.ReplyTo == nil {
break
}
currentURI = *note.ReplyTo
}
return parents, nil
}
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