[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, 54 insertions, 0 deletions

diff --git a/internal/processing/conversations/update_test.go b/internal/processing/conversations/update_test.go
new file mode 100644
index 000000000..8ba2800fe
--- /dev/null
+++ b/internal/processing/conversations/update_test.go
@@ -0,0 +1,54 @@
+// 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 conversations_test
+
+import (
+	"context"
+)
+
+// Test that we can create conversations when a new status comes in.
+func (suite *ConversationsTestSuite) TestUpdateConversationsForStatus() {
+	ctx := context.Background()
+
+	// Precondition: the test user shouldn't have any conversations yet.
+	conversations, err := suite.db.GetConversationsByOwnerAccountID(ctx, suite.testAccount.ID, nil)
+	if err != nil {
+		suite.FailNow(err.Error())
+	}
+	suite.Empty(conversations)
+
+	// Create a status.
+	threadID := suite.NewULID(0)
+	status := suite.NewTestStatus(suite.testAccount, threadID, 0, nil)
+
+	// Update conversations for it.
+	notifications, err := suite.conversationsProcessor.UpdateConversationsForStatus(ctx, status)
+	if err != nil {
+		suite.FailNow(err.Error())
+	}
+
+	// In this test, the user is DMing themself, and should not receive a notification from that.
+	suite.Empty(notifications)
+
+	// The test user should have a conversation now.
+	conversations, err = suite.db.GetConversationsByOwnerAccountID(ctx, suite.testAccount.ID, nil)
+	if err != nil {
+		suite.FailNow(err.Error())
+	}
+	suite.NotEmpty(conversations)
+}