[feature] persist worker queues to db (#3042)

* persist queued worker tasks to database on shutdown, fill worker queues from database on startup

* ensure the tasks are sorted by creation time before pushing them

* add migration to insert WorkerTask{} into database, add test for worker task persistence

* add test for recovering worker queues from database

* quick tweak

* whoops we ended up with double cleaner job scheduling

* insert each task separately, because bun is throwing some reflection error??

* add specific checking of cancelled worker contexts

* add http request signing to deliveries recovered from database

* add test for outgoing public key ID being correctly set on delivery

* replace select with Queue.PopCtx()

* get rid of loop now we don't use it

* remove field now we don't use it

* ensure that signing func is set

* header values weren't being copied over 🤦

* use ptr for httpclient.Request in delivery

* move worker queue filling to later in server init process

* fix rebase issues

* make logging less shouty

* use slices.Delete() instead of copying / reslicing

* have database return tasks in ascending order instead of sorting them

* add a 1 minute timeout to persisting worker queues

internal/transport/delivery/delivery.go

@@ -33,10 +33,6 @@ import (
 // be indexed (and so, dropped from queue)
 // by any of these possible ID IRIs.
 type Delivery struct {
-	// PubKeyID is the signing public key
-	// ID of the actor performing request.
-	PubKeyID string
-
 	// ActorID contains the ActivityPub
 	// actor ID IRI (if any) of the activity
 	// being sent out by this request.
@@ -55,7 +51,7 @@ type Delivery struct {
 	// Request is the prepared (+ wrapped)
 	// httpclient.Client{} request that
 	// constitutes this ActivtyPub delivery.
-	Request httpclient.Request
+	Request *httpclient.Request
 
 	// internal fields.
 	next time.Time
@@ -66,7 +62,6 @@ type Delivery struct {
 // a json serialize / deserialize
 // able shape that minimizes data.
 type delivery struct {
-	PubKeyID string              `json:"pub_key_id,omitempty"`
 	ActorID  string              `json:"actor_id,omitempty"`
 	ObjectID string              `json:"object_id,omitempty"`
 	TargetID string              `json:"target_id,omitempty"`
@@ -101,7 +96,6 @@ func (dlv *Delivery) Serialize() ([]byte, error) {
 
 	// Marshal as internal JSON type.
 	return json.Marshal(delivery{
-		PubKeyID: dlv.PubKeyID,
 		ActorID:  dlv.ActorID,
 		ObjectID: dlv.ObjectID,
 		TargetID: dlv.TargetID,
@@ -125,7 +119,6 @@ func (dlv *Delivery) Deserialize(data []byte) error {
 	}
 
 	// Copy over simplest fields.
-	dlv.PubKeyID = idlv.PubKeyID
 	dlv.ActorID = idlv.ActorID
 	dlv.ObjectID = idlv.ObjectID
 	dlv.TargetID = idlv.TargetID
@@ -143,6 +136,13 @@ func (dlv *Delivery) Deserialize(data []byte) error {
 		return err
 	}
 
+	// Copy over any stored header values.
+	for key, values := range idlv.Header {
+		for _, value := range values {
+			r.Header.Add(key, value)
+		}
+	}
+
 	// Wrap request in httpclient type.
 	dlv.Request = httpclient.WrapRequest(r)