[Libguestfs] [PATCH] v2v: -o rhv-upload: Optimize http request sending

[Nir Soffer]

When sending request with small or no payload, it is simpler and
possibly more efficient to use the high level HTTPSConnection.request(),
instead of the lower level APIs.

The only reason to use the lower level APIs is to avoid copying the
payload, or on python 2, to use a bigger buffer size when streaming a
file-like object.
---
 v2v/rhv-upload-plugin.py | 35 ++++++++++++++++-------------------
 1 file changed, 16 insertions(+), 19 deletions(-)

diff --git a/v2v/rhv-upload-plugin.py b/v2v/rhv-upload-plugin.py
index ed99cc7a9..3fad865f6 100644
--- a/v2v/rhv-upload-plugin.py
+++ b/v2v/rhv-upload-plugin.py
@@ -263,12 +263,12 @@ def pread(h, count, offset):
     transfer = h['transfer']
     transfer_service = h['transfer_service']
 
-    http.putrequest("GET", h['path'])
+    headers = {"Range", "bytes=%d-%d" % (offset, offset+count-1)}
     # Authorization is only needed for old imageio.
     if h['needs_auth']:
-        http.putheader("Authorization", transfer.signed_ticket)
-    http.putheader("Range", "bytes=%d-%d" % (offset, offset+count-1))
-    http.endheaders()
+        headers["Authorization"] = transfer.signed_ticket
+
+    http.request("GET", h['path'], headers=headers)
 
     r = http.getresponse()
     # 206 = HTTP Partial Content.
@@ -319,11 +319,10 @@ def zero(h, count, offset, may_trim):
                       'size': count,
                       'flush': False}).encode()
 
-    http.putrequest("PATCH", h['path'])
-    http.putheader("Content-Type", "application/json")
-    http.putheader("Content-Length", len(buf))
-    http.endheaders()
-    http.send(buf)
+    headers = {"Content-Type": "application/json",
+               "Content-Length", str(len(buf))}
+
+    http.request("PATCH", h['path'], body=buf, headers=headers)
 
     r = http.getresponse()
     if r.status != 200:
@@ -368,11 +367,10 @@ def trim(h, count, offset):
                       'size': count,
                       'flush': False}).encode()
 
-    http.putrequest("PATCH", h['path'])
-    http.putheader("Content-Type", "application/json")
-    http.putheader("Content-Length", len(buf))
-    http.endheaders()
-    http.send(buf)
+    headers = {"Content-Type": "application/json",
+               "Content-Length", str(len(buf))}
+
+    http.request("PATCH", h['path'], body=buf, headers=headers)
 
     r = http.getresponse()
     if r.status != 200:
@@ -387,11 +385,10 @@ def flush(h):
     # Construct the JSON request for flushing.
     buf = json.dumps({'op': "flush"}).encode()
 
-    http.putrequest("PATCH", h['path'])
-    http.putheader("Content-Type", "application/json")
-    http.putheader("Content-Length", len(buf))
-    http.endheaders()
-    http.send(buf)
+    headers = {"Content-Type": "application/json",
+               "Content-Length", str(len(buf))}
+
+    http.request("PATCH", h['path'], body=buf, headers=headers)
 
     r = http.getresponse()
     if r.status != 200:
-- 
2.17.1