[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, 151 insertions, 0 deletions

diff --git a/internal/processing/conversations/conversations_test.go b/internal/processing/conversations/conversations_test.go
new file mode 100644
index 000000000..cc7ec617e
--- /dev/null
+++ b/internal/processing/conversations/conversations_test.go
@@ -0,0 +1,151 @@
+// 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"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	dbtest "github.com/superseriousbusiness/gotosocial/internal/db/test"
+	"github.com/superseriousbusiness/gotosocial/internal/email"
+	"github.com/superseriousbusiness/gotosocial/internal/federation"
+	"github.com/superseriousbusiness/gotosocial/internal/filter/visibility"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/log"
+	"github.com/superseriousbusiness/gotosocial/internal/media"
+	"github.com/superseriousbusiness/gotosocial/internal/messages"
+	"github.com/superseriousbusiness/gotosocial/internal/processing/conversations"
+	"github.com/superseriousbusiness/gotosocial/internal/state"
+	"github.com/superseriousbusiness/gotosocial/internal/storage"
+	"github.com/superseriousbusiness/gotosocial/internal/transport"
+	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
+	"github.com/superseriousbusiness/gotosocial/testrig"
+)
+
+type ConversationsTestSuite struct {
+	// standard suite interfaces
+	suite.Suite
+	db                  db.DB
+	tc                  *typeutils.Converter
+	storage             *storage.Driver
+	state               state.State
+	mediaManager        *media.Manager
+	transportController transport.Controller
+	federator           *federation.Federator
+	emailSender         email.Sender
+	sentEmails          map[string]string
+	filter              *visibility.Filter
+
+	// standard suite models
+	testTokens       map[string]*gtsmodel.Token
+	testClients      map[string]*gtsmodel.Client
+	testApplications map[string]*gtsmodel.Application
+	testUsers        map[string]*gtsmodel.User
+	testAccounts     map[string]*gtsmodel.Account
+	testFollows      map[string]*gtsmodel.Follow
+	testAttachments  map[string]*gtsmodel.MediaAttachment
+	testStatuses     map[string]*gtsmodel.Status
+
+	// module being tested
+	conversationsProcessor conversations.Processor
+
+	// Owner of test conversations
+	testAccount *gtsmodel.Account
+
+	// Mixin for conversation tests
+	dbtest.ConversationFactory
+}
+
+func (suite *ConversationsTestSuite) getClientMsg(timeout time.Duration) (*messages.FromClientAPI, bool) {
+	ctx := context.Background()
+	ctx, cncl := context.WithTimeout(ctx, timeout)
+	defer cncl()
+	return suite.state.Workers.Client.Queue.PopCtx(ctx)
+}
+
+func (suite *ConversationsTestSuite) SetupSuite() {
+	suite.testTokens = testrig.NewTestTokens()
+	suite.testClients = testrig.NewTestClients()
+	suite.testApplications = testrig.NewTestApplications()
+	suite.testUsers = testrig.NewTestUsers()
+	suite.testAccounts = testrig.NewTestAccounts()
+	suite.testFollows = testrig.NewTestFollows()
+	suite.testAttachments = testrig.NewTestAttachments()
+	suite.testStatuses = testrig.NewTestStatuses()
+
+	suite.ConversationFactory.SetupSuite(suite)
+}
+
+func (suite *ConversationsTestSuite) SetupTest() {
+	suite.state.Caches.Init()
+	testrig.StartNoopWorkers(&suite.state)
+
+	testrig.InitTestConfig()
+	testrig.InitTestLog()
+
+	suite.db = testrig.NewTestDB(&suite.state)
+	suite.state.DB = suite.db
+	suite.tc = typeutils.NewConverter(&suite.state)
+	suite.filter = visibility.NewFilter(&suite.state)
+
+	testrig.StartTimelines(
+		&suite.state,
+		suite.filter,
+		suite.tc,
+	)
+
+	suite.storage = testrig.NewInMemoryStorage()
+	suite.state.Storage = suite.storage
+	suite.mediaManager = testrig.NewTestMediaManager(&suite.state)
+
+	suite.transportController = testrig.NewTestTransportController(&suite.state, testrig.NewMockHTTPClient(nil, "../../../testrig/media"))
+	suite.federator = testrig.NewTestFederator(&suite.state, suite.transportController, suite.mediaManager)
+	suite.sentEmails = make(map[string]string)
+	suite.emailSender = testrig.NewEmailSender("../../../web/template/", suite.sentEmails)
+
+	suite.conversationsProcessor = conversations.New(&suite.state, suite.tc, suite.filter)
+	testrig.StandardDBSetup(suite.db, nil)
+	testrig.StandardStorageSetup(suite.storage, "../../../testrig/media")
+
+	suite.ConversationFactory.SetupTest(suite.db)
+
+	suite.testAccount = suite.testAccounts["local_account_1"]
+}
+
+func (suite *ConversationsTestSuite) TearDownTest() {
+	conversationModels := []interface{}{
+		(*gtsmodel.Conversation)(nil),
+		(*gtsmodel.ConversationToStatus)(nil),
+	}
+	for _, model := range conversationModels {
+		if err := suite.db.DropTable(context.Background(), model); err != nil {
+			log.Error(context.Background(), err)
+		}
+	}
+
+	testrig.StandardDBTeardown(suite.db)
+	testrig.StandardStorageTeardown(suite.storage)
+	testrig.StopWorkers(&suite.state)
+}
+
+func TestConversationsTestSuite(t *testing.T) {
+	suite.Run(t, new(ConversationsTestSuite))
+}