[feature] Conversations API (#3013)

* Implement conversations API

* Sort and page conversations by last status ID

* Appease linter

* Fix deleting conversations and statuses

* Refactor to make migrations automatic

* Lint

* Update tests post-merge

* Fixes from live-fire testing

* Linter caught a format problem

* Refactor tests, fix cache

* Negative test for non-DMs

* Run conversations advanced migration on testrig startup as well as regular server startup

* Document (lack of) side effects of API method for deleting a conversation

* Make not-found check less nested for readability

* Rename PutConversation to UpsertConversation

* Use util.Ptr instead of IIFE

* Reduce cache used by conversations

* Remove unnecessary TableExpr/ColumnExpr

* Use struct tags for both unique constraints on Conversation

* Make it clear how paging with GetDirectStatusIDsBatch should be used

* Let conversation paging skip conversations it can't render

* Use Bun NewDropTable

* Convert delete raw query to Bun

* Convert update raw query to Bun

* Convert latestConversationStatusesTempTable raw query partially to Bun

* Convert conversationStatusesTempTable raw query partially to Bun

* Rename field used to store result of MaxDirectStatusID

* Move advanced migrations to their own tiny processor

* Catch up util function name with main

* Remove json.… wrappers

* Remove redundant check

* Combine error checks

* Replace map with slice of structs

* Address processor/type converter comments

- Add context info for errors
- Extract some common processor code into shared methods
- Move conversation eligibility check ahead of populating conversation

* Add error context when dropping temp tables

1 files changed, 52 insertions, 0 deletions

diff --git a/internal/db/conversation.go b/internal/db/conversation.go
new file mode 100644
index 000000000..3d0b4213e
--- /dev/null
+++ b/internal/db/conversation.go
@@ -0,0 +1,52 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package db
+
+import (
+	"context"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/paging"
+)
+
+type Conversation interface {
+	// GetConversationByID gets a single conversation by ID.
+	GetConversationByID(ctx context.Context, id string) (*gtsmodel.Conversation, error)
+
+	// GetConversationByThreadAndAccountIDs retrieves a conversation by thread ID and participant account IDs, if it exists.
+	GetConversationByThreadAndAccountIDs(ctx context.Context, threadID string, accountID string, otherAccountIDs []string) (*gtsmodel.Conversation, error)
+
+	// GetConversationsByOwnerAccountID gets all conversations owned by the given account,
+	// with optional paging based on last status ID.
+	GetConversationsByOwnerAccountID(ctx context.Context, accountID string, page *paging.Page) ([]*gtsmodel.Conversation, error)
+
+	// UpsertConversation creates or updates a conversation.
+	UpsertConversation(ctx context.Context, conversation *gtsmodel.Conversation, columns ...string) error
+
+	// LinkConversationToStatus creates a conversation-to-status link.
+	LinkConversationToStatus(ctx context.Context, statusID string, conversationID string) error
+
+	// DeleteConversationByID deletes a conversation, removing it from the owning account's conversation list.
+	DeleteConversationByID(ctx context.Context, id string) error
+
+	// DeleteConversationsByOwnerAccountID deletes all conversations owned by the given account.
+	DeleteConversationsByOwnerAccountID(ctx context.Context, accountID string) error
+
+	// DeleteStatusFromConversations handles when a status is deleted by updating or deleting conversations for which it was the last status.
+	DeleteStatusFromConversations(ctx context.Context, statusID string) error
+}