Home timeline (#28)

* v. basic implementation of home timeline

* Go fmt ./...

internal/db/db.go

@@ -32,18 +32,20 @@ const (
 
 // ErrNoEntries is to be returned from the DB interface when no entries are found for a given query.
 type ErrNoEntries struct{}
+
 func (e ErrNoEntries) Error() string {
 	return "no entries"
 }
 
 // ErrAlreadyExists is to be returned from the DB interface when an entry already exists for a given query or its constraints.
 type ErrAlreadyExists struct{}
+
 func (e ErrAlreadyExists) Error() string {
 	return "already exists"
 }
 
 type Where struct {
-	Key string
+	Key   string
 	Value interface{}
 }
 
@@ -278,6 +280,10 @@ type DB interface {
 	// This slice will be unfiltered, not taking account of blocks and whatnot, so filter it before serving it back to a user.
 	WhoFavedStatus(status *gtsmodel.Status) ([]*gtsmodel.Account, error)
 
+	// GetHomeTimelineForAccount fetches the account's HOME timeline -- ie., posts and replies from people they *follow*.
+	// It will use the given filters and try to return as many statuses up to the limit as possible.
+	GetHomeTimelineForAccount(accountID string, maxID string, sinceID string, minID string, limit int, local bool) ([]*gtsmodel.Status, error)
+
 	/*
 		USEFUL CONVERSION FUNCTIONS
 	*/

internal/db/pg/pg.go

@@ -1103,6 +1103,26 @@ func (ps *postgresService) WhoFavedStatus(status *gtsmodel.Status) ([]*gtsmodel.
 	return accounts, nil
 }
 
+func (ps *postgresService) GetHomeTimelineForAccount(accountID string, maxID string, sinceID string, minID string, limit int, local bool) ([]*gtsmodel.Status, error) {
+	statuses := []*gtsmodel.Status{}
+
+	q := ps.conn.Model(&statuses).
+		ColumnExpr("status.*").
+		Join("JOIN follows AS f ON f.target_account_id = status.account_id").
+		Where("f.account_id = ?", accountID).
+		Limit(limit).
+		Order("status.created_at DESC")
+
+	err := q.Select()
+	if err != nil {
+		if err != pg.ErrNoRows {
+			return nil, err
+		}
+	}
+
+	return statuses, nil
+}
+
 /*
 	CONVERSION FUNCTIONS
 */