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Re: [libvirt] [test-API PATCH] Added screenshot test

On 04/02/2012 08:18 PM, Martin Kletzander wrote:
This patch adds a test that obtains a screenshot of a domain and saves
it in a file.

Maybe we shoud later on modify this or add another test to allow comparing the returned image file against a pre-defined pattern, so we could actualy check if the complete stack including the OS, qemu, video drivers and libvirt's streams work.

  repos/domain/screenshot.py |   57 ++++++++++++++++++++++++++++++++++++++++++++
  1 files changed, 57 insertions(+), 0 deletions(-)
  create mode 100644 repos/domain/screenshot.py

diff --git a/repos/domain/screenshot.py b/repos/domain/screenshot.py
new file mode 100644
index 0000000..9986cab
--- /dev/null
+++ b/repos/domain/screenshot.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+"""This test is used for creating a screenshot of a domain and saving
+   it in a file. The Screenshot format is hypervisor specific.
+   mandatory arguments: guestname
+                        screen
+                        filename
+import os
+import mimetypes
+import libvirt
+def check_params(params):
+    """Verify input parameters"""
+    for key in ('guestname', 'screen', 'filename'):
+        if key not in params:
+            raise KeyError('Missing key %s required for screenshot test' % key)
+    params['screen'] = int(params['screen'])
+    params['filename'] = os.path.abspath(params['filename'])
+def saver(stream, data, file_):
+    return file_.write(data)
+def screenshot(params):
+    """This method takes a screenshot of a running machine and saves
+    it in a filename"""
+    ret = 1

I'm starting to notice this pattern. My test contain something very similar ... a try block, that contains all of the code for testing and then some exception and other cleanup code. I think this pattern will be very common and we should consider moving it one level up, to free the test writers from copying blocks of common code across all test cases.

+    try:
+        logger = params['logger']
+        check_params(params)
+        conn = libvirt.open(params['uri'])
+        dom = conn.lookupByName(params['guestname'])
+        st = conn.newStream(0)
+        mime = dom.screenshot(st, params['screen'], 0)
+        ext = mimetypes.guess_extension(mime) or '.ppm'
+        filename = params['filename'] + ext
+        f = file(filename, 'w')
+        logger.debug('Saving screenshot into %s' % filename)
+        st.recvAll(saver, f)
+        logger.debug('Mimetype of the file is %s' % mime)
+        ret = st.finish()
+    finally:
+        # Some error occurred, cleanup
+        if 'conn' in locals() and conn.isAlive():
+            conn.close()
+    return ret

Looks good, but I'm not a very experienced Pythonist, so if somebody else (Guannan?) could have a quick look and confirm my ACK before pushing.


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