pyln: Add mypy typing exceptions for external dependencies

We don't control them, and starting to write type stubs for them is a
different can of worms.

contrib/pyln-testing/Makefile

@@ -25,7 +25,7 @@ check-pytest:
 	pytest tests
 
 check-mypy:
-	mypy --namespace-packages tests pyln
+	MYPYPATH=$(PYTHONPATH) mypy --namespace-packages tests pyln
 
 $(SDIST_FILE):
 	python3 setup.py sdist

contrib/pyln-testing/pyln/testing/btcproxy.py

@@ -1,10 +1,10 @@
 """ A bitcoind proxy that allows instrumentation and canned responses
 """
 from flask import Flask, request
-from bitcoin.rpc import JSONRPCError
+from bitcoin.rpc import JSONRPCError  # type: ignore
-from bitcoin.rpc import RawProxy as BitcoinProxy
+from bitcoin.rpc import RawProxy as BitcoinProxy  # type: ignore
-from cheroot.wsgi import Server
+from cheroot.wsgi import Server  # type: ignore
-from cheroot.wsgi import PathInfoDispatcher
+from cheroot.wsgi import PathInfoDispatcher  # type: ignore
 
 import decimal
 import flask

contrib/pyln-testing/pyln/testing/db.py

@@ -1,10 +1,10 @@
-from ephemeral_port_reserve import reserve
+from ephemeral_port_reserve import reserve  # type: ignore
 from glob import glob
 
 import itertools
 import logging
 import os
-import psycopg2
+import psycopg2  # type: ignore
 import random
 import re
 import shutil
@@ -13,18 +13,19 @@ import sqlite3
 import string
 import subprocess
 import time
+from typing import Dict, List, Optional, Union
 
 
 class Sqlite3Db(object):
-    def __init__(self, path):
+    def __init__(self, path: str) -> None:
         self.path = path
 
-    def get_dsn(self):
+    def get_dsn(self) -> None:
         """SQLite3 doesn't provide a DSN, resulting in no CLI-option.
         """
         return None
 
-    def query(self, query):
+    def query(self, query: str) -> Union[List[Dict[str, Union[int, bytes]]], List[Dict[str, Optional[int]]], List[Dict[str, str]], List[Dict[str, Union[str, int]]], List[Dict[str, int]]]:
         orig = os.path.join(self.path)
         copy = self.path + ".copy"
         shutil.copyfile(orig, copy)
@@ -44,7 +45,7 @@ class Sqlite3Db(object):
         db.close()
         return result
 
-    def execute(self, query):
+    def execute(self, query: str) -> None:
         db = sqlite3.connect(self.path)
         c = db.cursor()
         c.execute(query)
@@ -91,20 +92,20 @@ class PostgresDb(object):
 
 
 class SqliteDbProvider(object):
-    def __init__(self, directory):
+    def __init__(self, directory: str) -> None:
         self.directory = directory
 
-    def start(self):
+    def start(self) -> None:
         pass
 
-    def get_db(self, node_directory, testname, node_id):
+    def get_db(self, node_directory: str, testname: str, node_id: int) -> Sqlite3Db:
         path = os.path.join(
             node_directory,
             'lightningd.sqlite3'
         )
         return Sqlite3Db(path)
 
-    def stop(self):
+    def stop(self) -> None:
         pass
 
 

contrib/pyln-testing/pyln/testing/utils.py

@@ -1,10 +1,10 @@
-from bitcoin.core import COIN
+from bitcoin.core import COIN  # type: ignore
-from bitcoin.rpc import RawProxy as BitcoinProxy
+from bitcoin.rpc import RawProxy as BitcoinProxy  # type: ignore
 from pyln.client import RpcError
 from pyln.testing.btcproxy import BitcoinRpcProxy
 from collections import OrderedDict
 from decimal import Decimal
-from ephemeral_port_reserve import reserve
+from ephemeral_port_reserve import reserve  # type: ignore
 from pyln.client import LightningRpc
 from pyln.client import Millisatoshi