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qmp: Output error detail when execute QMP command failed

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Only get 'QMP command failed' error message now when execute QMP
command by 'executeCommandWithResponse' failed. This patch will
output more error detail.

Signed-off-by: NingBo <ning.bo9@zte.com.cn>
This commit is contained in:
NingBo 2018-11-29 16:20:03 +08:00
parent 99e0358ba9
commit f30fd1354a
1 changed files with 27 additions and 2 deletions
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29
qemu/qmp.go
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@ -313,7 +313,7 @@ func (q *QMP) finaliseCommandWithResponse(cmdEl *list.Element, cmdQueue *list.Li
if succeeded {
cmd.res <- qmpResult{response: response}
} else {
cmd.res <- qmpResult{err: fmt.Errorf("QMP command failed")}
cmd.res <- qmpResult{err: fmt.Errorf("QMP command failed: %v", response)}
}
}
if cmdQueue.Len() > 0 {
@ -325,6 +325,23 @@ func (q *QMP) finaliseCommand(cmdEl *list.Element, cmdQueue *list.List, succeede
q.finaliseCommandWithResponse(cmdEl, cmdQueue, succeeded, nil)
}
func (q *QMP) errorDesc(errorData interface{}) (string, error) {
// convert error to json
data, err := json.Marshal(errorData)
if err != nil {
return "", fmt.Errorf("Unable to extract error information: %v", err)
}
// see: https://github.com/qemu/qemu/blob/stable-2.12/qapi/qmp-dispatch.c#L125
var qmpErr map[string]string
// convert json to qmpError
if err = json.Unmarshal(data, &qmpErr); err != nil {
return "", fmt.Errorf("Unable to convert json to qmpError: %v", err)
}
return qmpErr["desc"], nil
}
func (q *QMP) processQMPInput(line []byte, cmdQueue *list.List) {
var vmData map[string]interface{}
err := json.Unmarshal(line, &vmData)
@ -339,7 +356,7 @@ func (q *QMP) processQMPInput(line []byte, cmdQueue *list.List) {
}
response, succeeded := vmData["return"]
_, failed := vmData["error"]
errData, failed := vmData["error"]
if !succeeded && !failed {
return
@ -353,6 +370,14 @@ func (q *QMP) processQMPInput(line []byte, cmdQueue *list.List) {
}
cmd := cmdEl.Value.(*qmpCommand)
if failed || cmd.filter == nil {
if errData != nil {
desc, err := q.errorDesc(errData)
if err != nil {
q.cfg.Logger.Infof("Get error description failed: %v", err)
} else {
response = desc
}
}
q.finaliseCommandWithResponse(cmdEl, cmdQueue, succeeded, response)
} else {
cmd.resultReceived = true