pytest: test rpc_command hook chain

tests/plugins/rpc_command_2.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+"""
+This plugin is used to test the chained `rpc_command` hook.
+"""
+from pyln.client import Plugin
+
+plugin = Plugin()
+
+
+@plugin.hook("rpc_command")
+def on_rpc_command(plugin, rpc_command, **kwargs):
+    request = rpc_command
+    if request["method"] == "invoice":
+        # Replace part of this command
+        request["params"]["description"] = "rpc_command_2 modified this description"
+        return {"replace": request}
+    elif request["method"] == "sendpay":
+        # Don't allow this command to be executed
+        return {"return": {"error": {"code": -1,
+                                     "message": "rpc_command_2 cannot do this"}}}
+    return {"result": "continue"}
+
+
+plugin.run()