Re: [Libguestfs] [PATCH v2] v2v: -o rhv-upload: Log full imageio response on failure.

Thanks: Nir Soffer --- v2v/rhv-upload-plugin.py | 69 +++++++++++++++++++++++++++++------------------- 1 file changed, 42 insertions(+), 27 deletions(-) diff --git a/v2v/rhv-upload-plugin.py b/v2v/rhv-upload-plugin.py index 791c9e7d2..f43ad0097 100644 --- a/v2v/rhv-upload-plugin.py +++ b/v2v/rhv-upload-plugin.py @@ -228,6 +228,32 @@ def can_flush(h): def get_size(h): return params['disk_size'] +# Any unexpected HTTP response status from the server will end up +# calling this function which logs the full error, pauses the +# transfer, sets the failed state, and raises a RuntimeError +# exception. +def request_failed(h, r, msg): + # Setting the failed flag in the handle causes the disk to be + # cleaned up on close. + h['failed'] = True + h['transfer_service'].pause() + + status = r.status + reason = r.reason + try: + body = r.read() + except EnvironmentError as e: + body = "(Unable to read response body: %s)" % e + + # Log the full error if we're verbose. + debug("unexpected response from imageio server:") + debug(msg) + debug("%d: %s" % (status, reason)) + debug(body) + + # Only a short error is included in the exception. + raise RuntimeError("%s: %d %s: %r", msg, status, reason, body[:200]) + # For documentation see: # https://github.com/oVirt/ovirt-imageio/blob/master/docs/random-io.md # For examples of working code to read/write from the server, see: @@ -248,16 +274,14 @@ def pread(h, count, offset): r = http.getresponse() # 206 = HTTP Partial Content. if r.status != 206: - h['transfer_service'].pause() - h['failed'] = True - raise RuntimeError("could not read sector (%d, %d): %d: %s" % - (offset, count, r.status, r.reason)) + request_failed(h, r, + "could not read sector offset %d size %d" % + (offset, count)) return r.read() def pwrite(h, buf, offset): http = h['http'] transfer = h['transfer'] - transfer_service = h['transfer_service'] count = len(buf) h['highestwrite'] = max(h['highestwrite'], offset+count) @@ -275,15 +299,13 @@ def pwrite(h, buf, offset): r = http.getresponse() if r.status != 200: - transfer_service.pause() - h['failed'] = True - raise RuntimeError("could not write sector (%d, %d): %d: %s" % - (offset, count, r.status, r.reason)) + request_failed(h, r, + "could not write sector offset %d size %d" % + (offset, count)) def zero(h, count, offset, may_trim): http = h['http'] transfer = h['transfer'] - transfer_service = h['transfer_service'] # Unlike the trim and flush calls, there is no 'can_zero' method # so nbdkit could call this even if the server doesn't support @@ -306,10 +328,9 @@ def zero(h, count, offset, may_trim): r = http.getresponse() if r.status != 200: - transfer_service.pause() - h['failed'] = True - raise RuntimeError("could not zero sector (%d, %d): %d: %s" % - (offset, count, r.status, r.reason)) + request_failed(h, r, + "could not zero sector offset %d size %d" % + (offset, count)) def emulate_zero(h, count, offset): # qemu-img convert starts by trying to zero/trim the whole device. @@ -334,15 +355,13 @@ def emulate_zero(h, count, offset): r = http.getresponse() if r.status != 200: - transfer_service.pause() - h['failed'] = True - raise RuntimeError("could not write zeroes (%d, %d): %d: %s" % - (offset, count, r.status, r.reason)) + request_failed(h, r, + "could not write zeroes offset %d size %d" % + (offset, count)) def trim(h, count, offset): http = h['http'] transfer = h['transfer'] - transfer_service = h['transfer_service'] # Construct the JSON request for trimming. buf = json.dumps({'op': "trim", @@ -358,15 +377,13 @@ def trim(h, count, offset): r = http.getresponse() if r.status != 200: - transfer_service.pause() - h['failed'] = True - raise RuntimeError("could not trim sector (%d, %d): %d: %s" % - (offset, count, r.status, r.reason)) + request_failed(h, r, + "could not trim sector offset %d size %d" % + (offset, count)) def flush(h): http = h['http'] transfer = h['transfer'] - transfer_service = h['transfer_service'] # Construct the JSON request for flushing. buf = json.dumps({'op': "flush"}).encode() @@ -379,9 +396,7 @@ def flush(h): r = http.getresponse() if r.status != 200: - transfer_service.pause() - h['failed'] = True - raise RuntimeError("could not flush: %d: %s" % (r.status, r.reason)) + request_failed(h, r, "could not flush") def delete_disk_on_failure(h): disk_service = h['disk_service'] -- 2.16.2