msggen: adding example and fixes typo

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

contrib/msggen/examples/generator_example.py

@@ -0,0 +1,37 @@
+#! /usr/bin/python3
+"""
+Example of usage msggen module.
+
+This example introduces a fake generator to understand how the
+package works, If you would like to see a real generator example
+try to see the Rust generator in the `msggen/gen/rust.py`
+
+author: https://github.com/vincenzopalazzo
+"""
+from msggen.gen.generator import GeneratorChain, IGenerator
+from msggen import Service
+from msggen.utils import load_jsonrpc_service
+
+
+class MonkylangGen(IGenerator):
+    """This is the custom generator that implements a monkylang generator
+     that uses the interface handler IGenerator."""
+
+    def generate(self, service: Service):
+        self.write('println("Monky")')
+
+
+def register_monkylang_gen(generator_chain: GeneratorChain):
+    """Helper function to register the custom generator, and
+    load the correct path of the json schema."""
+    file = '<your_path_of_result>'
+    dest = open(file, 'w')
+    generator_chain.add_generator(MonkylangGen(dest))
+
+
+if __name__ == '__main__':
+    schema_dir = '<path_of_json_schema_dir>'
+    service = load_jsonrpc_service(schema_dir=schema_dir)
+    generator_chain = GeneratorChain()
+    register_monkylang_gen(generator_chain)
+    generator_chain.generate(service)

contrib/msggen/msggen/__main__.py

@@ -5,7 +5,7 @@ from msggen.gen.generator import GeneratorChain
 from msggen.utils import repo_root, load_jsonrpc_service
 
 
-def gengrpc(generator_chain: GeneratorChain, meta):
+def add_handler_gen_grpc(generator_chain: GeneratorChain, meta):
     """Load all mapped RPC methods, wrap them in a Service, and split them into messages.
     """
     fname = repo_root() / "cln-grpc" / "proto" / "node.proto"
@@ -22,7 +22,7 @@ def gengrpc(generator_chain: GeneratorChain, meta):
     generator_chain.add_generator(GrpcServerGenerator(dest))
 
 
-def genrustjsonrpc(generator_chain: GeneratorChain):
+def add_handler_gen_rust_jsonrpc(generator_chain: GeneratorChain):
     fname = repo_root() / "cln-rpc" / "src" / "model.rs"
     dest = open(fname, "w")
     generator_chain.add_generator(RustGenerator(dest))
@@ -43,8 +43,8 @@ def run():
     meta = load_msggen_meta()
     generator_chain = GeneratorChain()
 
-    gengrpc(generator_chain, meta)
-    genrustjsonrpc(generator_chain)
+    add_handler_gen_grpc(generator_chain, meta)
+    add_handler_gen_rust_jsonrpc(generator_chain)
 
     generator_chain.generate(service)
 

contrib/msggen/msggen/gen/generator.py

@@ -10,7 +10,7 @@ from msggen.model import Service
 
 class IGenerator(ABC):
     """
-    Change of responsibility handler that need to be
+    Chain of responsibility handler that need to be
     implemented by all the generators.
     """
 
@@ -21,7 +21,7 @@ class IGenerator(ABC):
 
 class GeneratorChain:
     """
-    Chain responsibility patter implementation to generalize
+    Chain responsibility pattern implementation to generalize
     the generation method.
     """