REFACTOR: create 'GetPaginatedQuery' function to encapsulate queries with cursors

pkg/scraper/api_errors.go

@@ -1,12 +1,12 @@
 package scraper
 
 import (
-	"fmt"
+	"errors"
 )
 
 var (
-	END_OF_FEED        = fmt.Errorf("End of feed")
+	END_OF_FEED        = errors.New("End of feed")
-	DOESNT_EXIST       = fmt.Errorf("Doesn't exist")
+	ErrDoesntExist     = errors.New("Doesn't exist")
-	EXTERNAL_API_ERROR = fmt.Errorf("Unexpected result from external API")
+	EXTERNAL_API_ERROR = errors.New("Unexpected result from external API")
-	API_PARSE_ERROR    = fmt.Errorf("Couldn't parse the result returned from the API")
+	ErrorIsTombstone   = errors.New("tweet is a tombstone")
 )

pkg/scraper/api_types_v2.go

@@ -11,9 +11,6 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
-var ErrorIsTombstone = errors.New("tweet is a tombstone")
-var ErrTweetNotFound = errors.New("api responded 'no status found with that ID'")
-
 type CardValue struct {
 	Type        string `json:"type"`
 	StringValue string `json:"string_value"`
@@ -808,6 +805,7 @@ func (r APIV2Response) ToTweetTroveAsLikes() (TweetTrove, error) {
 
 type PaginatedQuery interface {
 	NextPage(api *API, cursor string) (APIV2Response, error)
+	ToTweetTrove(r APIV2Response) (TweetTrove, error)
 }
 
 func (api *API) GetMore(pq PaginatedQuery, response *APIV2Response, count int) error {
@@ -820,10 +818,12 @@ func (api *API) GetMore(pq PaginatedQuery, response *APIV2Response, count int) e
 
 		if fresh_response.GetCursorBottom() == last_response.GetCursorBottom() && len(fresh_response.GetMainInstruction().Entries) == 0 {
 			// Empty response, cursor same as previous: end of feed has been reached
+			fmt.Printf("Cursor repeated; EOF\n")
 			return END_OF_FEED
 		}
 		if fresh_response.IsEmpty() {
 			// Response has a pinned tweet, but no other content: end of feed has been reached
+			fmt.Printf("No non-pinned-tweet entries; EOF\n")
 			return END_OF_FEED // TODO: check that there actually is a pinned tweet and the request didn't just fail lol
 		}
 
@@ -839,6 +839,31 @@ func (api *API) GetMore(pq PaginatedQuery, response *APIV2Response, count int) e
 	return nil
 }
 
+func (api *API) GetPaginatedQuery(pq PaginatedQuery, count int) (TweetTrove, error) {
+	fmt.Printf("Paginating %d count\n", count)
+	api_response, err := pq.NextPage(api, "")
+	if err != nil {
+		return TweetTrove{}, fmt.Errorf("Error calling API to fetch query %#v:\n  %w", pq, err)
+	}
+	if len(api_response.GetMainInstruction().Entries) < count && api_response.GetCursorBottom() != "" {
+		err = api.GetMore(pq, &api_response, count)
+		if errors.Is(err, END_OF_FEED) {
+			println("End of feed!")
+		} else if err != nil {
+			return TweetTrove{}, err
+		}
+	}
+
+	trove, err := pq.ToTweetTrove(api_response)
+	if err != nil {
+		return TweetTrove{}, fmt.Errorf("Error parsing the tweet trove for query %#v:\n  %w", pq, err)
+	}
+
+	fmt.Println("------------")
+	err = trove.PostProcess()
+	return trove, err
+}
+
 // Get a User feed using the new GraphQL twitter api
 func (api *API) GetGraphqlFeedFor(user_id UserID, cursor string) (APIV2Response, error) {
 	url, err := url.Parse(GraphqlURL{
@@ -877,6 +902,9 @@ type PaginatedUserFeed struct {
 func (p PaginatedUserFeed) NextPage(api *API, cursor string) (APIV2Response, error) {
 	return api.GetGraphqlFeedFor(p.user_id, cursor)
 }
+func (p PaginatedUserFeed) ToTweetTrove(r APIV2Response) (TweetTrove, error) {
+	return r.ToTweetTrove()
+}
 
 func (api *API) GetTweetDetail(tweet_id TweetID, cursor string) (APIV2Response, error) {
 	url, err := url.Parse(GraphqlURL{
@@ -919,6 +947,12 @@ func (api *API) GetTweetDetail(tweet_id TweetID, cursor string) (APIV2Response,
 
 	var response APIV2Response
 	err = api.do_http(url.String(), cursor, &response)
+	if len(response.Errors) != 0 {
+		if response.Errors[0].Message == "_Missing: No status found with that ID." {
+			return response, ErrDoesntExist
+		}
+		return response, fmt.Errorf("%w: %s", EXTERNAL_API_ERROR, response.Errors[0].Message)
+	}
 
 	return response, err
 }
@@ -930,6 +964,9 @@ type PaginatedTweetReplies struct {
 func (p PaginatedTweetReplies) NextPage(api *API, cursor string) (APIV2Response, error) {
 	return api.GetTweetDetail(p.tweet_id, cursor)
 }
+func (p PaginatedTweetReplies) ToTweetTrove(r APIV2Response) (TweetTrove, error) {
+	return r.ToTweetTrove()
+}
 
 func (api *API) GetUserLikes(user_id UserID, cursor string) (APIV2Response, error) {
 	url, err := url.Parse(GraphqlURL{
@@ -984,33 +1021,23 @@ type PaginatedUserLikes struct {
 func (p PaginatedUserLikes) NextPage(api *API, cursor string) (APIV2Response, error) {
 	return api.GetUserLikes(p.user_id, cursor)
 }
-
+func (p PaginatedUserLikes) ToTweetTrove(r APIV2Response) (TweetTrove, error) {
-func GetUserLikes(user_id UserID, how_many int) (TweetTrove, error) {
+	ret, err := r.ToTweetTroveAsLikes()
-	response, err := the_api.GetUserLikes(user_id, "")
-	if err != nil {
-		return TweetTrove{}, err
-	}
-
-	if len(response.GetMainInstruction().Entries) < how_many && response.GetCursorBottom() != "" {
-		err = the_api.GetMore(PaginatedUserLikes{user_id}, &response, how_many)
-		if errors.Is(err, END_OF_FEED) {
-			println("End of feed!")
-		} else if err != nil {
-			return TweetTrove{}, err
-		}
-	}
-	trove, err := response.ToTweetTroveAsLikes()
 	if err != nil {
 		return TweetTrove{}, err
 	}
 
 	// Fill out the liking UserID
-	for i := range trove.Likes {
+	for i := range ret.Likes {
-		l := trove.Likes[i]
+		l := ret.Likes[i]
-		l.UserID = user_id
+		l.UserID = p.user_id
-		trove.Likes[i] = l
+		ret.Likes[i] = l
 	}
-	return trove, nil
+	return ret, nil
+}
+
+func GetUserLikes(user_id UserID, how_many int) (TweetTrove, error) {
+	return the_api.GetPaginatedQuery(PaginatedUserLikes{user_id}, how_many)
 }
 
 func (api *API) GetHomeTimeline(cursor string, is_for_you bool) (TweetTrove, error) {
@@ -1175,3 +1202,6 @@ type PaginatedSearch struct {
 func (p PaginatedSearch) NextPage(api *API, cursor string) (APIV2Response, error) {
 	return api.Search(p.query, cursor)
 }
+func (p PaginatedSearch) ToTweetTrove(r APIV2Response) (TweetTrove, error) {
+	return r.ToTweetTrove()
+}

pkg/scraper/search.go

@@ -1,10 +1,5 @@
 package scraper
 
-import (
-	"errors"
-	"fmt"
-)
-
 func TimestampToDateString(timestamp int) string {
 	panic("???") // TODO
 }
@@ -18,28 +13,5 @@ func TimestampToDateString(timestamp int) string {
  * - videos
  */
 func Search(query string, min_results int) (trove TweetTrove, err error) {
-	api_response, err := the_api.Search(query, "")
+	return the_api.GetPaginatedQuery(PaginatedSearch{query}, min_results)
-	if err != nil {
-		return
-	}
-
-	if len(api_response.GetMainInstruction().Entries) < min_results && api_response.GetCursorBottom() != "" {
-		err = the_api.GetMore(PaginatedSearch{query}, &api_response, min_results)
-		if errors.Is(err, END_OF_FEED) {
-			println("End of feed!")
-		} else if err != nil {
-			return
-		}
-	}
-
-	trove, err = api_response.ToTweetTrove()
-	if err != nil {
-		err = fmt.Errorf("Error parsing the tweet trove for search query %q:\n  %w", query, err)
-		return
-	}
-
-	// Filling tombstones and tombstoned users is probably not necessary here, but we still
-	// need to fetch Spaces
-	err = trove.PostProcess()
-	return
 }

pkg/scraper/tweet.go

@@ -327,39 +327,16 @@ func GetTweetFull(id TweetID, how_many int) (trove TweetTrove, err error) {
 	return
 }
 
-func GetTweetFullAPIV2(id TweetID, how_many int) (trove TweetTrove, err error) {
+func GetTweetFullAPIV2(id TweetID, how_many int) (TweetTrove, error) {
-	resp, err := the_api.GetTweetDetail(id, "")
+	trove, err := the_api.GetPaginatedQuery(PaginatedTweetReplies{id}, how_many)
-	if err != nil {
+	if errors.Is(err, ErrDoesntExist) {
-		err = fmt.Errorf("Error getting tweet detail: %d\n  %w", id, err)
-		return
-	}
-	if len(resp.Errors) != 0 {
-		if resp.Errors[0].Message == "_Missing: No status found with that ID." {
 		trove := NewTweetTrove()
 		trove.Tweets[id] = Tweet{ID: id, TombstoneType: "deleted", IsConversationScraped: true}
 		return trove, nil
-		}
+	} else if err != nil {
-		panic(fmt.Sprintf("Unknown error: %s", resp.Errors[0].Message))
-	}
-
-	err = the_api.GetMore(PaginatedTweetReplies{id}, &resp, how_many)
-	if err != nil && !errors.Is(err, END_OF_FEED) {
-		err = fmt.Errorf("Error getting more replies in tweet detail: %d\n  %w", id, err)
-		return
-	}
-	trove, err = resp.ToTweetTrove()
-	if err != nil {
 		return trove, err
 	}
 
-	// Quoted tombstones need their user_id filled out from the tombstoned_users list
-	log.Debug("Running tweet trove post-processing\n")
-	err = trove.PostProcess()
-	if err != nil {
-		err = fmt.Errorf("Error getting tweet (id %d):\n  %w", id, err)
-		return
-	}
-
 	// Find the main tweet and update its "is_conversation_downloaded" and "last_scraped_at"
 	tweet, ok := trove.Tweets[id]
 	if !ok {
@@ -369,5 +346,5 @@ func GetTweetFullAPIV2(id TweetID, how_many int) (trove TweetTrove, err error) {
 	tweet.IsConversationScraped = true
 	trove.Tweets[id] = tweet
 
-	return
+	return trove, err
 }

pkg/scraper/user_feed.go

@@ -33,25 +33,5 @@ func GetUserFeedFor(user_id UserID, min_tweets int) (trove TweetTrove, err error
 }
 
 func GetUserFeedGraphqlFor(user_id UserID, min_tweets int) (trove TweetTrove, err error) {
-	api_response, err := the_api.GetGraphqlFeedFor(user_id, "")
+	return the_api.GetPaginatedQuery(PaginatedUserFeed{user_id}, min_tweets)
-	if err != nil {
-		err = fmt.Errorf("Error calling API to fetch user feed: UserID %d\n  %w", user_id, err)
-		return
-	}
-
-	if len(api_response.GetMainInstruction().Entries) < min_tweets && api_response.GetCursorBottom() != "" {
-		err = the_api.GetMore(PaginatedUserFeed{user_id}, &api_response, min_tweets)
-		if err != nil && !errors.Is(err, END_OF_FEED) {
-			return
-		}
-	}
-
-	trove, err = api_response.ToTweetTrove()
-	if err != nil {
-		panic(err)
-	}
-
-	fmt.Println("------------")
-	err = trove.PostProcess()
-	return trove, err
 }