uaiohttpclient: Update "yield from" to "await".

Signed-off-by: Mark Blakeney <mark.blakeney@bullet-systems.net>

micropython/uaiohttpclient/uaiohttpclient.py

@@ -5,8 +5,8 @@ class ClientResponse:
     def __init__(self, reader):
         self.content = reader
 
-    def read(self, sz=-1):
+    async def read(self, sz=-1):
-        return (yield from self.content.read(sz))
+        return await self.content.read(sz)
 
     def __repr__(self):
         return "<ClientResponse %d %s>" % (self.status, self.headers)
@@ -17,22 +17,22 @@ class ChunkedClientResponse(ClientResponse):
         self.content = reader
         self.chunk_size = 0
 
-    def read(self, sz=4 * 1024 * 1024):
+    async def read(self, sz=4 * 1024 * 1024):
         if self.chunk_size == 0:
-            line = yield from self.content.readline()
+            line = await self.content.readline()
             # print("chunk line:", l)
             line = line.split(b";", 1)[0]
             self.chunk_size = int(line, 16)
             # print("chunk size:", self.chunk_size)
             if self.chunk_size == 0:
                 # End of message
-                sep = yield from self.content.read(2)
+                sep = await self.content.read(2)
                 assert sep == b"\r\n"
                 return b""
-        data = yield from self.content.read(min(sz, self.chunk_size))
+        data = await self.content.read(min(sz, self.chunk_size))
         self.chunk_size -= len(data)
         if self.chunk_size == 0:
-            sep = yield from self.content.read(2)
+            sep = await self.content.read(2)
             assert sep == b"\r\n"
         return data
 
@@ -40,7 +40,7 @@ class ChunkedClientResponse(ClientResponse):
         return "<ChunkedClientResponse %d %s>" % (self.status, self.headers)
 
 
-def request_raw(method, url):
+async def request_raw(method, url):
     try:
         proto, dummy, host, path = url.split("/", 3)
     except ValueError:
@@ -55,7 +55,7 @@ def request_raw(method, url):
 
     if proto != "http:":
         raise ValueError("Unsupported protocol: " + proto)
-    reader, writer = yield from asyncio.open_connection(host, port)
+    reader, writer = await asyncio.open_connection(host, port)
     # Use protocol 1.0, because 1.1 always allows to use chunked
     # transfer-encoding But explicitly set Connection: close, even
     # though this should be default for 1.0, because some servers
@@ -65,22 +65,21 @@ def request_raw(method, url):
         path,
         host,
     )
-    yield from writer.awrite(query.encode("latin-1"))
+    await writer.awrite(query.encode("latin-1"))
-    #    yield from writer.aclose()
     return reader
 
 
-def request(method, url):
+async def request(method, url):
     redir_cnt = 0
     while redir_cnt < 2:
-        reader = yield from request_raw(method, url)
+        reader = await request_raw(method, url)
         headers = []
-        sline = yield from reader.readline()
+        sline = await reader.readline()
         sline = sline.split(None, 2)
         status = int(sline[1])
         chunked = False
         while True:
-            line = yield from reader.readline()
+            line = await reader.readline()
             if not line or line == b"\r\n":
                 break
             headers.append(line)
@@ -92,7 +91,7 @@ def request(method, url):
 
         if 301 <= status <= 303:
             redir_cnt += 1
-            yield from reader.aclose()
+            await reader.aclose()
             continue
         break