Implement basic node side image caching

.gitignore

@@ -3,6 +3,7 @@
 .godot/
 /[Bb]uild/
 /[Oo]utput/
+/[Cc]ache/
 # Godot-specific ignores
 .import/
 export.cfg

Main.gd

@@ -5,6 +5,7 @@ var config = ConfigFile.new()
 var websocket_url
 var public_path
 var output_dir
+var cache_dir
 var auth_key
 var rendering = false
 signal finished_rendering
@@ -15,11 +16,14 @@ func _ready():
 	websocket_url = config.get_value("core", "websocket_url")
 	public_path = config.get_value("core", "public_path")
 	output_dir = config.get_value("core", "output_dir")
+	cache_dir = config.get_value("core", "cache_dir")
 	auth_key = config.get_value("core", "auth_key")
+	
 	print("Starting render node")
 	
 	var directory = DirAccess.open(".")
 	directory.make_dir(output_dir)
+	directory.make_dir(cache_dir)
 	$JobServer.InitWebsocket()
 
 func FinishedRendering():

RemoteLoader.gd

@@ -3,17 +3,33 @@ extends HTTPRequest
 func GetRemoteImage(url):
 	var image = Image.new()
 	print("Fetching remote image %s" % url)
+	var urlHash = str(url.hash())
+	var outFile = "{dir}/{hash}-{fileName}.png".format({
+		'dir': $"/root/Main".cache_dir,
+		'hash': urlHash,
+		'fileName': url.get_file().rsplit(".", true, 1)[0]
+	})
+
+	if FileAccess.file_exists(outFile):
+		image.load(outFile)
+		print("Loaded image from cache. " + outFile)
+		return image
+	
+	timeout = 1000
 	request(url)
 	var res = await request_completed
 	var magicBytes = res[3].slice(0,8)
 	print(magicBytes)
+	var fileType = url.get_extension()
 	var error = null
-	if magicBytes == PackedByteArray([137, 80, 78, 71, 13, 10, 26, 10]):
+	if fileType == "png" or magicBytes == PackedByteArray([137, 80, 78, 71, 13, 10, 26, 10]):
 		print("Detected PNG File")
 		error = image.load_png_from_buffer(res[3])
-	if magicBytes == PackedByteArray([255, 216, 255, 224, 0, 16, 74, 70]):
+	if ["jpg", "jpeg"].has(fileType) or magicBytes == PackedByteArray([255, 216, 255, 224, 0, 16, 74, 70]):
 		print("Detected JPG File")
 		error = image.load_jpg_from_buffer(res[3])
 	if error != OK:
 		print("Error fetching image ", str(error))
+	image.save_png(outFile)
+	print("Saved new image to cache. " + outFile)
 	return image

Renderer.gd

@@ -45,7 +45,7 @@ func RenderJob(job):
 	
 	# Get rendered image
 	var img = get_viewport().get_texture().get_image()
-	var outFile = "%s_%s.png" % [job["type"],job["jobId"]]
+	var outFile = "%s_%s.png" % [job["type"],str(job["elements"]).hash()]
 	img.save_png("%s/%s" % [$"/root/Main".output_dir, outFile])
 	
 	return outFile

example-config.cfg

@@ -3,3 +3,4 @@ auth_key=ay1234
 websocket_url="ws://localhost:6980"
 public_path="http://localhost:8899/"
 output_dir="./output"
+cache_dir="./cache"