[v3,03/16] python/qmp.py: re-absorb MonitorResponseError

Commit Message

John Snow June 4, 2020, 8:22 p.m. UTC

When I initially split this out, I considered this more of a machine
error than a QMP protocol error, but I think that's misguided.

Move this back to qmp.py and name it QMPResponseError. Convert
qmp.command() to use this exception type.

Signed-off-by: John Snow <[e-mail]>
Reviewed-by: Philippe Mathieu-Daudé <[e-mail]>
---
 python/qemu/machine.py        | 15 +--------------
 python/qemu/qmp.py            | 17 +++++++++++++++--
 scripts/render_block_graph.py |  7 +++++--
 3 files changed, 21 insertions(+), 18 deletions(-)

Patch

diff --git a/python/qemu/machine.py b/python/qemu/machine.py
index 99bcb499878..8ea027566e4 100644
--- a/python/qemu/machine.py
+++ b/python/qemu/machine.py
@@ -49,19 +49,6 @@  class QEMUMachineAddDeviceError(QEMUMachineError):
     """
 
 
-class MonitorResponseError(qmp.QMPError):
-    """
-    Represents erroneous QMP monitor reply
-    """
-    def __init__(self, reply):
-        try:
-            desc = reply["error"]["desc"]
-        except KeyError:
-            desc = reply
-        super().__init__(desc)
-        self.reply = reply
-
-
 class QEMUMachine:
     """
     A QEMU VM
@@ -469,7 +456,7 @@  def command(self, cmd, conv_keys=True, **args):
         if reply is None:
             raise qmp.QMPError("Monitor is closed")
         if "error" in reply:
-            raise MonitorResponseError(reply)
+            raise qmp.QMPResponseError(reply)
         return reply["return"]
 
     def get_qmp_event(self, wait=False):
diff --git a/python/qemu/qmp.py b/python/qemu/qmp.py
index 8388c7b6030..aa8a666b8ab 100644
--- a/python/qemu/qmp.py
+++ b/python/qemu/qmp.py
@@ -61,6 +61,19 @@  class QMPTimeoutError(QMPError):
     """
 
 
+class QMPResponseError(QMPError):
+    """
+    Represents erroneous QMP monitor reply
+    """
+    def __init__(self, reply: QMPMessage):
+        try:
+            desc = reply['error']['desc']
+        except KeyError:
+            desc = reply
+        super().__init__(desc)
+        self.reply = reply
+
+
 class QEMUMonitorProtocol:
     """
     Provide an API to connect to QEMU via QEMU Monitor Protocol (QMP) and then
@@ -251,8 +264,8 @@  def command(self, cmd, **kwds):
         Build and send a QMP command to the monitor, report errors if any
         """
         ret = self.cmd(cmd, kwds)
-        if "error" in ret:
-            raise Exception(ret['error']['desc'])
+        if 'error' in ret:
+            raise QMPResponseError(ret)
         return ret['return']
 
     def pull_event(self, wait=False):
diff --git a/scripts/render_block_graph.py b/scripts/render_block_graph.py
index 409b4321f2e..da6acf050d1 100755
--- a/scripts/render_block_graph.py
+++ b/scripts/render_block_graph.py
@@ -25,7 +25,10 @@ 
 from graphviz import Digraph
 
 sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'python'))
-from qemu.machine import MonitorResponseError
+from qemu.qmp import (
+    QEMUMonitorProtocol,
+    QMPResponseError,
+)
 
 
 def perm(arr):
@@ -102,7 +105,7 @@  def command(self, cmd):
         reply = json.loads(subprocess.check_output(ar))
 
         if 'error' in reply:
-            raise MonitorResponseError(reply)
+            raise QMPResponseError(reply)
 
         return reply['return']