[feature] add worker task serialization logic (#2989)

* improved server shutdown with more precise shutdown of modules + deferring of ALL of it

* move delivery and workers into separate files

* add worker task model and Serialize() / Deserialize() methods for message types

* start adding message serialize / deserialize tests

* start adding test cases

* update body rewinding to rely on standard library mechanism of r.GetBody()

* remove request rewinding (http.Client{} should already handle this)

* standard library already handles rewinding

* improved code comment

* move the newPOST() function contents to prepare(), fits better with current API

* add Serialize() / Deserialize() implementations for Delivery{} type

* finish writing FromClientAPI sserialize / deserialize tests

* start adding FromFediAPI{} serialize / deserialize test cases

* fix FromFediAPI{} tests

* add tests for delivery message type

* fix repeat code

* missing license header

* use testrig status and accounts for marshal / unmarshaling tests

* add a specific test for checking account RSA keys are preserved

1 files changed, 0 insertions, 62 deletions

diff --git a/internal/httpclient/sign.go b/internal/httpclient/sign.go
deleted file mode 100644
index eff20be49..000000000
--- a/internal/httpclient/sign.go
+++ /dev/null
@@ -1,62 +0,0 @@
-// 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 httpclient
-
-import (
-	"net/http"
-	"time"
-
-	"codeberg.org/gruf/go-byteutil"
-	"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
-)
-
-// SignFunc is a function signature that provides request signing.
-type SignFunc func(r *http.Request) error
-
-// signingtransport wraps an http.Transport{}
-// (RoundTripper implementer) to check request
-// context for a signing function and using for
-// all subsequent trips through RoundTrip().
-type signingtransport struct{ http.Transport }
-
-func (t *signingtransport) RoundTrip(r *http.Request) (*http.Response, error) {
-	// Ensure updated host always set.
-	r.Header.Set("Host", r.URL.Host)
-
-	if sign := gtscontext.HTTPClientSignFunc(r.Context()); sign != nil {
-		// Reset signing header fields
-		now := time.Now().UTC()
-		r.Header.Set("Date", now.Format("Mon, 02 Jan 2006 15:04:05")+" GMT")
-		r.Header.Del("Signature")
-		r.Header.Del("Digest")
-
-		// Rewind body reader and content-length if set.
-		if rc, ok := r.Body.(*byteutil.ReadNopCloser); ok {
-			rc.Rewind() // set len AFTER rewind
-			r.ContentLength = int64(rc.Len())
-		}
-
-		// Sign the outgoing request.
-		if err := sign(r); err != nil {
-			return nil, err
-		}
-	}
-
-	// Pass to underlying transport.
-	return t.Transport.RoundTrip(r)
-}