[performance] massively improved ActivityPub delivery worker efficiency (#2812)

* add delivery worker type that pulls from queue to httpclient package

* finish up some code commenting, bodge a vendored activity library change, integrate the deliverypool changes into transportcontroller

* hook up queue deletion logic

* support deleting queued http requests by target ID

* don't index APRequest by hostname in the queue

* use gorun

* use the original context's values when wrapping msg type as delivery{}

* actually log in the AP delivery worker ...

* add uncommitted changes

* use errors.AsV2()

* use errorsv2.AsV2()

* finish adding some code comments, add bad host handling to delivery workers

* slightly tweak deliveryworkerpool API, use advanced sender multiplier

* remove PopCtx() method, let others instead rely on Wait()

* shuffle things around to move delivery stuff into transport/ subpkg

* remove dead code

* formatting

* validate request before queueing for delivery

* finish adding code comments, fix up backoff code

* finish adding more code comments

* clamp minimum no. senders to 1

* add start/stop logging to delivery worker, some slight changes

* remove double logging

* use worker ptrs

* expose the embedded log fields in httpclient.Request{}

* ensure request context values are preserved when updating ctx

* add delivery worker tests

* fix linter issues

* ensure delivery worker gets inited in testrig

* fix tests to delivering messages to check worker delivery queue

* update error type to use ptr instead of value receiver

* fix test calling Workers{}.Start() instead of testrig.StartWorkers()

* update docs for advanced-sender-multiplier

* update to the latest activity library version

* add comment about not using httptest.Server{}

2 files changed, 35 insertions, 18 deletions

diff --git a/internal/processing/workers/federate.go b/internal/processing/workers/federate.go
index 9fdb8f662..e737513f5 100644
--- a/internal/processing/workers/federate.go
+++ b/internal/processing/workers/federate.go
@@ -75,6 +75,12 @@ func (f *federate) DeleteAccount(ctx context.Context, account *gtsmodel.Account)
 		return nil
 	}
 
+	// Drop any queued outgoing AP requests to / from account,
+	// (this stops any queued likes, boosts, creates etc).
+	f.state.Workers.Delivery.Queue.Delete("ActorID", account.URI)
+	f.state.Workers.Delivery.Queue.Delete("ObjectID", account.URI)
+	f.state.Workers.Delivery.Queue.Delete("TargetID", account.URI)
+
 	// Parse relevant URI(s).
 	outboxIRI, err := parseURI(account.OutboxURI)
 	if err != nil {
@@ -222,6 +228,11 @@ func (f *federate) DeleteStatus(ctx context.Context, status *gtsmodel.Status) er
 		return nil
 	}
 
+	// Drop any queued outgoing http requests for status,
+	// (this stops any queued likes, boosts, creates etc).
+	f.state.Workers.Delivery.Queue.Delete("ObjectID", status.URI)
+	f.state.Workers.Delivery.Queue.Delete("TargetID", status.URI)
+
 	// Ensure the status model is fully populated.
 	if err := f.state.DB.PopulateStatus(ctx, status); err != nil {
 		return gtserror.Newf("error populating status: %w", err)
diff --git a/internal/processing/workers/fromfediapi_test.go b/internal/processing/workers/fromfediapi_test.go
index 1dbefca84..51f61bd12 100644
--- a/internal/processing/workers/fromfediapi_test.go
+++ b/internal/processing/workers/fromfediapi_test.go
@@ -21,6 +21,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"io"
 	"testing"
 	"time"
 
@@ -457,22 +458,6 @@ func (suite *FromFediAPITestSuite) TestProcessFollowRequestUnlocked() {
 	})
 	suite.NoError(err)
 
-	// an accept message should be sent to satan's inbox
-	var sent [][]byte
-	if !testrig.WaitFor(func() bool {
-		sentI, ok := suite.httpClient.SentMessages.Load(*originAccount.SharedInboxURI)
-		if ok {
-			sent, ok = sentI.([][]byte)
-			if !ok {
-				panic("SentMessages entry was not []byte")
-			}
-			return true
-		}
-		return false
-	}) {
-		suite.FailNow("timed out waiting for message")
-	}
-
 	accept := &struct {
 		Actor  string `json:"actor"`
 		ID     string `json:"id"`
@@ -486,8 +471,29 @@ func (suite *FromFediAPITestSuite) TestProcessFollowRequestUnlocked() {
 		To   string `json:"to"`
 		Type string `json:"type"`
 	}{}
-	err = json.Unmarshal(sent[0], accept)
-	suite.NoError(err)
+
+	// an accept message should be sent to satan's inbox
+	var sent []byte
+	if !testrig.WaitFor(func() bool {
+		delivery, ok := suite.state.Workers.Delivery.Queue.Pop()
+		if !ok {
+			return false
+		}
+		if !testrig.EqualRequestURIs(delivery.Request.URL, *originAccount.SharedInboxURI) {
+			panic("differing request uris")
+		}
+		sent, err = io.ReadAll(delivery.Request.Body)
+		if err != nil {
+			panic("error reading body: " + err.Error())
+		}
+		err = json.Unmarshal(sent, accept)
+		if err != nil {
+			panic("error unmarshaling json: " + err.Error())
+		}
+		return true
+	}) {
+		suite.FailNow("timed out waiting for message")
+	}
 
 	suite.Equal(targetAccount.URI, accept.Actor)
 	suite.Equal(originAccount.URI, accept.Object.Actor)