[feature] add per-uri dereferencer locks (#2291)

internal/federation/federatingdb/db.go

@@ -20,7 +20,6 @@ package federatingdb
 import (
 	"context"
 
-	"codeberg.org/gruf/go-mutexes"
 	"github.com/superseriousbusiness/activity/pub"
 	"github.com/superseriousbusiness/activity/streams/vocab"
 	"github.com/superseriousbusiness/gotosocial/internal/state"
@@ -40,7 +39,6 @@ type DB interface {
 // FederatingDB uses the underlying DB interface to implement the go-fed pub.Database interface.
 // It doesn't care what the underlying implementation of the DB interface is, as long as it works.
 type federatingDB struct {
-	locks     mutexes.MutexMap
 	state     *state.State
 	converter *typeutils.Converter
 }
@@ -48,7 +46,6 @@ type federatingDB struct {
 // New returns a DB interface using the given database and config
 func New(state *state.State, converter *typeutils.Converter) DB {
 	fdb := federatingDB{
-		locks:     mutexes.NewMap(-1, -1), // use defaults
 		state:     state,
 		converter: converter,
 	}

internal/federation/federatingdb/lock.go

@@ -19,7 +19,6 @@ package federatingdb
 
 import (
 	"context"
-	"errors"
 	"net/url"
 )
 
@@ -35,9 +34,5 @@ import (
 //
 // Used to ensure race conditions in multiple requests do not occur.
 func (f *federatingDB) Lock(c context.Context, id *url.URL) (func(), error) {
-	if id == nil {
-		return nil, errors.New("Lock: id was nil")
-	}
-	unlock := f.locks.Lock(id.String())
-	return unlock, nil
+	return f.state.FedLocks.Lock("federatingDB " + id.String()), nil // id should NEVER be nil.
 }