Allow the prompt request to specify the prompt ID. (#8189)

This makes it easier to write asynchronous clients that submit requests, because they can store the task immediately.
Duplicate prompt IDs are rejected by the job queue.

script_examples/websockets_api_example.py

@@ -10,11 +10,11 @@ import urllib.parse
 server_address = "127.0.0.1:8188"
 client_id = str(uuid.uuid4())
 
-def queue_prompt(prompt):
-    p = {"prompt": prompt, "client_id": client_id}
+def queue_prompt(prompt, prompt_id):
+    p = {"prompt": prompt, "client_id": client_id, "prompt_id": prompt_id}
     data = json.dumps(p).encode('utf-8')
-    req =  urllib.request.Request("http://{}/prompt".format(server_address), data=data)
-    return json.loads(urllib.request.urlopen(req).read())
+    req = urllib.request.Request("http://{}/prompt".format(server_address), data=data)
+    urllib.request.urlopen(req).read()
 
 def get_image(filename, subfolder, folder_type):
     data = {"filename": filename, "subfolder": subfolder, "type": folder_type}
@@ -27,7 +27,8 @@ def get_history(prompt_id):
         return json.loads(response.read())
 
 def get_images(ws, prompt):
-    prompt_id = queue_prompt(prompt)['prompt_id']
+    prompt_id = str(uuid.uuid4())
+    queue_prompt(prompt, prompt_id)
     output_images = {}
     while True:
         out = ws.recv()

server.py

@@ -678,7 +678,7 @@ class PromptServer():
 
             if "prompt" in json_data:
                 prompt = json_data["prompt"]
-                prompt_id = str(uuid.uuid4())
+                prompt_id = str(json_data.get("prompt_id", uuid.uuid4()))
                 valid = await execution.validate_prompt(prompt_id, prompt)
                 extra_data = {}
                 if "extra_data" in json_data: