Add logs to Logs page (#151)

* Add websocket connection

* Add logs to the log page

* Make debug color more readable

* Remove TODO from front page

* Put all log entries in latest first order

* Add filtering of log entries by level

* Limit log entries and throttle updates

* Fix logger not throttling broadcasts

* Remove now unnecessary UI-side log throttling

* Filter incoming logs by log level

* Make log view more terminal-like

pkg/api/resolver_query_logs.go

@@ -0,0 +1,23 @@
+package api
+
+import (
+	"context"
+
+	"github.com/stashapp/stash/pkg/logger"
+	"github.com/stashapp/stash/pkg/models"
+)
+
+func (r *queryResolver) Logs(ctx context.Context) ([]*models.LogEntry, error) {
+	logCache := logger.GetLogCache()
+	ret := make([]*models.LogEntry, len(logCache))
+
+	for i, entry := range logCache {
+		ret[i] = &models.LogEntry{
+			Time:    entry.Time,
+			Level:   getLogLevel(entry.Type),
+			Message: entry.Message,
+		}
+	}
+
+	return ret, nil
+}

pkg/api/resolver_subscription_logging.go

@@ -0,0 +1,60 @@
+package api
+
+import (
+	"context"
+
+	"github.com/stashapp/stash/pkg/logger"
+	"github.com/stashapp/stash/pkg/models"
+)
+
+func getLogLevel(logType string) models.LogLevel {
+	if logType == "progress" {
+		return models.LogLevelProgress
+	} else if logType == "debug" {
+		return models.LogLevelDebug
+	} else if logType == "info" {
+		return models.LogLevelInfo
+	} else if logType == "warn" {
+		return models.LogLevelWarning
+	} else if logType == "error" {
+		return models.LogLevelError
+	}
+
+	// default to debug
+	return models.LogLevelDebug
+}
+
+func logEntriesFromLogItems(logItems []logger.LogItem) []*models.LogEntry {
+	ret := make([]*models.LogEntry, len(logItems))
+
+	for i, entry := range logItems {
+		ret[i] = &models.LogEntry{
+			Time:    entry.Time,
+			Level:   getLogLevel(entry.Type),
+			Message: entry.Message,
+		}
+	}
+
+	return ret
+}
+
+func (r *subscriptionResolver) LoggingSubscribe(ctx context.Context) (<-chan []*models.LogEntry, error) {
+	ret := make(chan []*models.LogEntry, 100)
+	stop := make(chan int, 1)
+	logSub := logger.SubscribeToLog(stop)
+
+	go func() {
+		for {
+			select {
+			case logEntries := <-logSub:
+				ret <- logEntriesFromLogItems(logEntries)
+			case <-ctx.Done():
+				stop <- 0
+				close(ret)
+				return
+			}
+		}
+	}()
+
+	return ret, nil
+}