base adapter

requests/adapters.py

@@ -0,0 +1,99 @@
+# -*- coding: utf-8 -*-
+
+"""
+requests.adapters
+~~~~~~~~~~~~~~~~~
+
+This module contains the transport adapters that Requests uses to define
+and maintain connections.
+"""
+import os
+from .packages.urllib3.poolmanager import PoolManager
+from .utils import DEFAULT_CA_BUNDLE_PATH
+
+
+DEFAULT_POOLSIZE = 10
+DEFAULT_RETRIES = 0
+
+
+class BaseAdapter(object):
+    """The Base Transport Adapter"""
+
+    def __init__(self):
+        super(BaseAdapter, self).__init__()
+
+    def send(self):
+        raise NotImplementedError
+
+    def close(self):
+        raise NotImplementedError
+
+
+class HTTPAdapter(BaseAdapter):
+    """Built-In HTTP Adapter for Urllib3."""
+    def __init__(self,
+        pool_connections=DEFAULT_POOLSIZE,
+        pool_maxsize=DEFAULT_POOLSIZE):
+        self.max_retries = DEFAULT_RETRIES
+        self.config = {}
+
+        super(HTTPAdapter, self).__init__()
+
+        self.init_poolmanager(pool_connections, pool_maxsize)
+
+    def init_poolmanager(self, connections, maxsize):
+        self.poolmanager = PoolManager(num_pools=connections, maxsize=maxsize)
+
+    def cert_verify(self, conn, verify, cert):
+        if url.startswith('https') and self.verify:
+
+            cert_loc = None
+
+            # Allow self-specified cert location.
+            if self.verify is not True:
+                cert_loc = self.verify
+
+            # Look for configuration.
+            if not cert_loc and self.config.get('trust_env'):
+                cert_loc = os.environ.get('REQUESTS_CA_BUNDLE')
+
+            # Curl compatibility.
+            if not cert_loc and self.config.get('trust_env'):
+                cert_loc = os.environ.get('CURL_CA_BUNDLE')
+
+            if not cert_loc:
+                cert_loc = DEFAULT_CA_BUNDLE_PATH
+
+            if not cert_loc:
+                raise Exception("Could not find a suitable SSL CA certificate bundle.")
+
+            conn.cert_reqs = 'CERT_REQUIRED'
+            conn.ca_certs = cert_loc
+        else:
+            conn.cert_reqs = 'CERT_NONE'
+            conn.ca_certs = None
+
+        if self.cert:
+            if len(self.cert) == 2:
+                conn.cert_file = self.cert[0]
+                conn.key_file = self.cert[1]
+            else:
+                conn.cert_file = self.cert
+
+    def close(self):
+        """Dispose of any internal state.
+
+        Currently, this just closes the PoolManager, which closes pooled
+        connections.
+        """
+        self.poolmanager.clear()
+
+    def send(self, request, timeout, verify, cert):
+        """Sends PreparedRequest object. Returns Response object."""
+
+        conn = self._poolmanager.connection_from_url(request.url)
+        self.cert_verify(conn, verify, cert)
+
+
+
+