[chore] media and emoji refactoring (#3000)

* start updating media manager interface ready for storing attachments / emoji right away

* store emoji and media as uncached immediately, then (re-)cache on Processing{}.Load()

* remove now unused media workers

* fix tests and issues

* fix another test!

* fix emoji activitypub uri setting behaviour, fix remainder of test compilation issues

* fix more tests

* fix (most of) remaining tests, add debouncing to repeatedly failing media / emojis

* whoops, rebase issue

* remove kim's whacky experiments

* do some reshuffling, ensure emoji uri gets set

* ensure marked as not cached on cleanup

* tweaks to media / emoji processing to handle context canceled better

* ensure newly fetched emojis actually get set in returned slice

* use different varnames to be a bit more obvious

* move emoji refresh rate limiting to dereferencer

* add exported dereferencer functions for remote media, use these for recaching in processor

* add check for nil attachment in updateAttachment()

* remove unused emoji and media fields + columns

* see previous commit

* fix old migrations expecting image_updated_at to exists (from copies of old models)

* remove freshness checking code (seems to be broken...)

* fix error arg causing nil ptr exception

* finish documentating functions with comments, slight tweaks to media / emoji deref error logic

* remove some extra unneeded boolean checking

* finish writing documentation (code comments) for exported media manager methods

* undo changes to migration snapshot gtsmodels, updated failing migration to have its own snapshot

* move doesColumnExist() to util.go in migrations package

4 files changed, 23 insertions, 8 deletions

diff --git a/internal/api/activitypub/users/inboxpost_test.go b/internal/api/activitypub/users/inboxpost_test.go
index 9d863f234..64c9f7e6c 100644
--- a/internal/api/activitypub/users/inboxpost_test.go
+++ b/internal/api/activitypub/users/inboxpost_test.go
@@ -376,7 +376,17 @@ func (suite *InboxPostTestSuite) TestPostUpdate() {
 	}
 
 	// emojis should be updated
-	suite.Contains(dbUpdatedAccount.EmojiIDs, testEmoji.ID)
+	var haveUpdatedEmoji bool
+	for _, emoji := range dbUpdatedAccount.Emojis {
+		if emoji.Shortcode == testEmoji.Shortcode &&
+			emoji.Domain == testEmoji.Domain &&
+			emoji.ImageRemoteURL == emoji.ImageRemoteURL &&
+			emoji.ImageStaticRemoteURL == emoji.ImageStaticRemoteURL {
+			haveUpdatedEmoji = true
+			break
+		}
+	}
+	suite.True(haveUpdatedEmoji)
 
 	// account should be freshly fetched
 	suite.WithinDuration(time.Now(), dbUpdatedAccount.FetchedAt, 10*time.Second)
diff --git a/internal/api/client/admin/emojicreate_test.go b/internal/api/client/admin/emojicreate_test.go
index 46139df47..be39ebdf5 100644
--- a/internal/api/client/admin/emojicreate_test.go
+++ b/internal/api/client/admin/emojicreate_test.go
@@ -281,7 +281,7 @@ func (suite *EmojiCreateTestSuite) TestEmojiCreateAlreadyExists() {
 	suite.NoError(err)
 	suite.NotEmpty(b)
 
-	suite.Equal(`{"error":"Conflict: emoji with shortcode rainbow already exists"}`, string(b))
+	suite.Equal(`{"error":"Conflict: emoji with shortcode already exists"}`, string(b))
 }
 
 func TestEmojiCreateTestSuite(t *testing.T) {
diff --git a/internal/api/client/admin/emojiupdate_test.go b/internal/api/client/admin/emojiupdate_test.go
index 676363e39..11beaeaa9 100644
--- a/internal/api/client/admin/emojiupdate_test.go
+++ b/internal/api/client/admin/emojiupdate_test.go
@@ -20,6 +20,7 @@ package admin_test
 import (
 	"context"
 	"encoding/json"
+	"io"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -370,10 +371,10 @@ func (suite *EmojiUpdateTestSuite) TestEmojiUpdateModifyRemoteEmoji() {
 	defer result.Body.Close()
 
 	// check the response
-	b, err := ioutil.ReadAll(result.Body)
+	b, err := io.ReadAll(result.Body)
 	suite.NoError(err)
 
-	suite.Equal(`{"error":"Bad Request: emoji 01GD5KP5CQEE1R3X43Y1EHS2CW is not a local emoji, cannot update it via this endpoint"}`, string(b))
+	suite.Equal(`{"error":"Bad Request: cannot modify remote emoji"}`, string(b))
 }
 
 func (suite *EmojiUpdateTestSuite) TestEmojiUpdateModifyNoParams() {
@@ -440,7 +441,7 @@ func (suite *EmojiUpdateTestSuite) TestEmojiUpdateCopyLocalToLocal() {
 	b, err := ioutil.ReadAll(result.Body)
 	suite.NoError(err)
 
-	suite.Equal(`{"error":"Bad Request: emoji 01F8MH9H8E4VG3KDYJR9EGPXCQ is not a remote emoji, cannot copy it to local"}`, string(b))
+	suite.Equal(`{"error":"Bad Request: target emoji is not remote; cannot copy to local"}`, string(b))
 }
 
 func (suite *EmojiUpdateTestSuite) TestEmojiUpdateCopyEmptyShortcode() {
@@ -541,7 +542,7 @@ func (suite *EmojiUpdateTestSuite) TestEmojiUpdateCopyShortcodeAlreadyInUse() {
 	b, err := ioutil.ReadAll(result.Body)
 	suite.NoError(err)
 
-	suite.Equal(`{"error":"Conflict: emoji with shortcode rainbow already exists on this instance"}`, string(b))
+	suite.Equal(`{"error":"Conflict: emoji with shortcode already exists"}`, string(b))
 }
 
 func TestEmojiUpdateTestSuite(t *testing.T) {
diff --git a/internal/api/fileserver/servefile_test.go b/internal/api/fileserver/servefile_test.go
index c840d232f..cb3a35e45 100644
--- a/internal/api/fileserver/servefile_test.go
+++ b/internal/api/fileserver/servefile_test.go
@@ -19,7 +19,7 @@ package fileserver_test
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -28,6 +28,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/api/fileserver"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 	"github.com/superseriousbusiness/gotosocial/internal/media"
+	"github.com/superseriousbusiness/gotosocial/internal/middleware"
 	"github.com/superseriousbusiness/gotosocial/testrig"
 )
 
@@ -54,12 +55,15 @@ func (suite *ServeFileTestSuite) GetFile(
 	ctx.AddParam(fileserver.MediaSizeKey, string(mediaSize))
 	ctx.AddParam(fileserver.FileNameKey, filename)
 
+	logger := middleware.Logger(false)
 	suite.fileServer.ServeFile(ctx)
+	logger(ctx)
+
 	code = recorder.Code
 	headers = recorder.Result().Header
 
 	var err error
-	body, err = ioutil.ReadAll(recorder.Body)
+	body, err = io.ReadAll(recorder.Body)
 	if err != nil {
 		suite.FailNow(err.Error())
 	}