105 lines
2.3 KiB
Markdown
105 lines
2.3 KiB
Markdown
QMP
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===
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Package `qmp` enables interaction with QEMU instances via the QEMU Machine Protocol (QMP).
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## Available Drivers
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### Libvirt
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If your environment is managed by Libvirt, QMP interaction must be proxied through the Libvirt daemon. This can be be done through two available drivers:
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#### RPC
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The RPC driver provides a pure Go implementation of Libvirt's RPC protocol.
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```go
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//conn, err := net.DialTimeout("unix", "/var/run/libvirt/libvirt-sock", 2*time.Second)
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conn, err := net.DialTimeout("tcp", "192.168.1.1:16509", 2*time.Second)
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monitor := libvirtrpc.New("stage-lb-1", conn)
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```
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#### virsh
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A connection to the monitor socket is provided by proxing requests through the `virsh` executable.
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```go
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monitor, err := qmp.NewLibvirtMonitor("qemu:///system", "stage-lb-1")
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```
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### Socket
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If your QEMU instances are not managed by libvirt, direct communication over its UNIX socket is available.
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```go
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monitor, err := qmp.NewSocketMonitor("unix", "/var/lib/qemu/example.monitor", 2*time.Second)
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```
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## Examples
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Using the above to establish a new `qmp.Monitor`, the following examples provide a brief overview of QMP usage.
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_error checking omitted for the sake of brevity._
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### Command Execution
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```go
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type StatusResult struct {
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ID string `json:"id"`
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Return struct {
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Running bool `json:"running"`
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Singlestep bool `json:"singlestep"`
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Status string `json:"status"`
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} `json:"return"`
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}
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monitor.Connect()
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defer monitor.Disconnect()
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cmd := []byte(`{ "execute": "query-status" }`)
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raw, _ := monitor.Run(cmd)
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var result StatusResult
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json.Unmarshal(raw, &result)
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fmt.Println(result.Return.Status)
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```
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```
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running
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```
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### Event Monitor
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```go
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monitor.Connect()
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defer monitor.Disconnect()
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stream, _ := monitor.Events()
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for e := range stream {
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log.Printf("EVENT: %s", e.Event)
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}
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```
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```
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$ virsh reboot example
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Domain example is being rebooted
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```
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```
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EVENT: POWERDOWN
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EVENT: SHUTDOWN
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EVENT: STOP
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EVENT: RESET
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EVENT: RESUME
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EVENT: RESET
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...
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```
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## More information
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* [QEMU QMP Wiki](http://wiki.qemu.org/QMP)
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* [QEMU QMP Intro](http://git.qemu.org/?p=qemu.git;a=blob_plain;f=docs/qmp-intro.txt;hb=HEAD)
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* [QEMU QMP Events](http://git.qemu.org/?p=qemu.git;a=blob_plain;f=docs/qmp-events.txt;hb=HEAD)
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* [QEMU QMP Spec](http://git.qemu.org/?p=qemu.git;a=blob_plain;f=docs/qmp-spec.txt;hb=HEAD)
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