upip: url_open: Reworking error handling to guaranteedly close socket.

Author: pfalcon

upip/upip.py

@@ -117,32 +117,33 @@ def url_open(url):
     addr = ai[0][4]
 
     s = usocket.socket(ai[0][0])
-    #print("Connect address:", addr)
-    s.connect(addr)
-
-    if proto == "https:":
-        s = ussl.wrap_socket(s)
-        if warn_ussl:
-            print("Warning: %s SSL certificate is not validated" % host)
-            warn_ussl = False
-
-    # MicroPython rawsocket module supports file interface directly
-    s.write("GET /%s HTTP/1.0\r\nHost: %s\r\n\r\n" % (urlpath, host))
-    l = s.readline()
-    protover, status, msg = l.split(None, 2)
-    if status != b"200":
-        s.close()
-        exc = ValueError(status)
-        if status == b"404" or status == b"301":
-            fatal("Package not found", exc)
-        fatal("Unexpected error querying for package", exc)
-    while 1:
+    try:
+        #print("Connect address:", addr)
+        s.connect(addr)
+
+        if proto == "https:":
+            s = ussl.wrap_socket(s)
+            if warn_ussl:
+                print("Warning: %s SSL certificate is not validated" % host)
+                warn_ussl = False
+
+        # MicroPython rawsocket module supports file interface directly
+        s.write("GET /%s HTTP/1.0\r\nHost: %s\r\n\r\n" % (urlpath, host))
         l = s.readline()
-        if not l:
-            s.close()
-            fatal("Unexpected EOF in HTTP headers", ValueError())
-        if l == b'\r\n':
-            break
+        protover, status, msg = l.split(None, 2)
+        if status != b"200":
+            if status == b"404" or status == b"301":
+                raise NotFoundError("Package not found")
+            raise ValueError(status)
+        while 1:
+            l = s.readline()
+            if not l:
+                raise ValueError("Unexpected EOF in HTTP headers")
+            if l == b'\r\n':
+                break
+    except Exception as e:
+        s.close()
+        raise e
 
     return s
 
@@ -215,9 +216,10 @@ def install(to_install, install_path=None):
             if deps:
                 deps = deps.decode("utf-8").split("\n")
                 to_install.extend(deps)
-    except NotFoundError:
-        print("Error: cannot find '%s' package (or server error), packages may be partially installed" \
-            % pkg_spec, file=sys.stderr)
+    except Exception as e:
+        print("Error installing '{}': {}, packages may be partially installed".format(
+                pkg_spec, e),
+            file=sys.stderr)
 
 def get_install_path():
     global install_path