[chore] local instance count query caching, improved status context endpoint logging, don't log ErrHideStatus when timelining (#3330)

* ensure that errors checking status visibility / converting aren't dropped

* add some more context to error messages

* include calling function name in log entries

* don't error on timelining hidden status

* further code to ignore statusfilter.ErrHideStatus type errors

* remove unused error type

* add local instance status / domain / user counts

* add checks for localhost

* rename from InstanceCounts to LocalInstance

* improved code comment

internal/processing/common/status.go

@@ -25,6 +25,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/federation/dereferencing"
 	statusfilter "github.com/superseriousbusiness/gotosocial/internal/filter/status"
+	"github.com/superseriousbusiness/gotosocial/internal/filter/usermute"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 	"github.com/superseriousbusiness/gotosocial/internal/log"
@@ -50,6 +51,7 @@ func (p *Processor) GetTargetStatusBy(
 	// Fetch the target status from db.
 	target, err := getTargetFromDB()
 	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		err := gtserror.Newf("error getting from db: %w", err)
 		return nil, false, gtserror.NewErrorInternalError(err)
 	}
 
@@ -65,6 +67,7 @@ func (p *Processor) GetTargetStatusBy(
 	// Check whether target status is visible to requesting account.
 	visible, err = p.visFilter.StatusVisible(ctx, requester, target)
 	if err != nil {
+		err := gtserror.Newf("error checking visibility: %w", err)
 		return nil, false, gtserror.NewErrorInternalError(err)
 	}
 
@@ -174,14 +177,83 @@ func (p *Processor) GetAPIStatus(
 	apiStatus *apimodel.Status,
 	errWithCode gtserror.WithCode,
 ) {
-	apiStatus, err := p.converter.StatusToAPIStatus(ctx, target, requester, statusfilter.FilterContextNone, nil, nil)
+	apiStatus, err := p.converter.StatusToAPIStatus(ctx,
+		target,
+		requester,
+		statusfilter.FilterContextNone,
+		nil,
+		nil,
+	)
 	if err != nil {
-		err = gtserror.Newf("error converting status: %w", err)
+		err := gtserror.Newf("error converting: %w", err)
 		return nil, gtserror.NewErrorInternalError(err)
 	}
 	return apiStatus, nil
 }
 
+// GetVisibleAPIStatuses converts a slice of statuses to API
+// model statuses, filtering according to visibility to requester
+// along with given filter context, filters and user mutes.
+//
+// Please note that all errors will be logged at ERROR level,
+// but will not be returned. Callers are likely to run into
+// show-stopping errors in the lead-up to this function.
+func (p *Processor) GetVisibleAPIStatuses(
+	ctx context.Context,
+	requester *gtsmodel.Account,
+	statuses []*gtsmodel.Status,
+	filterContext statusfilter.FilterContext,
+	filters []*gtsmodel.Filter,
+	userMutes []*gtsmodel.UserMute,
+) []apimodel.Status {
+
+	// Start new log entry with
+	// the calling function name
+	// as a field in each entry.
+	l := log.WithContext(ctx).
+		WithField("caller", log.Caller(3))
+
+	// Compile mutes to useable user mutes for type converter.
+	compUserMutes := usermute.NewCompiledUserMuteList(userMutes)
+
+	// Iterate filtered statuses for conversion to API model.
+	apiStatuses := make([]apimodel.Status, 0, len(statuses))
+	for _, status := range statuses {
+
+		// Check whether status is visible to requester.
+		visible, err := p.visFilter.StatusVisible(ctx,
+			requester,
+			status,
+		)
+		if err != nil {
+			l.Errorf("error checking visibility: %v", err)
+			continue
+		}
+
+		if !visible {
+			continue
+		}
+
+		// Convert to API status, taking mute / filter into account.
+		apiStatus, err := p.converter.StatusToAPIStatus(ctx,
+			status,
+			requester,
+			filterContext,
+			filters,
+			compUserMutes,
+		)
+		if err != nil && !errors.Is(err, statusfilter.ErrHideStatus) {
+			l.Errorf("error converting: %v", err)
+			continue
+		}
+
+		// Append converted status to return slice.
+		apiStatuses = append(apiStatuses, *apiStatus)
+	}
+
+	return apiStatuses
+}
+
 // InvalidateTimelinedStatus is a shortcut function for invalidating the cached
 // representation one status in the home timeline and all list timelines of the
 // given accountID. It should only be called in cases where a status update