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// Copyright 2016 The go-qemu Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package qmp
import (
"context"
"encoding/json"
"net"
"github.com/digitalocean/go-libvirt"
)
var _ Monitor = &LibvirtRPCMonitor{}
// A LibvirtRPCMonitor implements LibVirt's remote procedure call protocol.
type LibvirtRPCMonitor struct {
l *libvirt.Libvirt
// Domain name as seen by libvirt, e.g., stage-lb-1
Domain string
}
// NewLibvirtRPCMonitor configures a new Libvirt RPC Monitor connection.
// The provided domain should be the name of the domain as seen
// by libvirt, e.g., stage-lb-1.
func NewLibvirtRPCMonitor(domain string, conn net.Conn) *LibvirtRPCMonitor {
l := libvirt.New(conn)
return &LibvirtRPCMonitor{
l: l,
Domain: domain,
}
}
// Connect establishes communication with the libvirt server.
// The underlying libvirt socket connection must be previously established.
func (rpc *LibvirtRPCMonitor) Connect() error {
return rpc.l.Connect()
}
// Disconnect shuts down communication with the libvirt server
// and closes the underlying net.Conn.
func (rpc *LibvirtRPCMonitor) Disconnect() error {
return rpc.l.Disconnect()
}
// Events streams QEMU QMP Events until the provided context is cancelled.
// If a problem is encountered setting up the event monitor connection
// an error will be returned. Errors encountered during streaming will
// cause the returned event channel to be closed.
func (rpc *LibvirtRPCMonitor) Events(ctx context.Context) (<-chan Event, error) {
events, err := rpc.l.SubscribeQEMUEvents(ctx, rpc.Domain)
if err != nil {
return nil, err
}
c := make(chan Event)
go func() {
// process events
for e := range events {
qe, err := qmpEvent(&e)
if err != nil {
close(c)
break
}
c <- *qe
}
}()
return c, nil
}
// Run executes the given QAPI command against a domain's QEMU instance.
// For a list of available QAPI commands, see:
// http://git.qemu.org/?p=qemu.git;a=blob;f=qapi-schema.json;hb=HEAD
func (rpc *LibvirtRPCMonitor) Run(cmd []byte) ([]byte, error) {
return rpc.l.Run(rpc.Domain, cmd)
}
// qmpEvent takes a libvirt DomainEvent and returns the QMP equivalent.
func qmpEvent(e *libvirt.DomainEvent) (*Event, error) {
var qe Event
if e.Details != nil {
if err := json.Unmarshal(e.Details, &qe.Data); err != nil {
return nil, err
}
}
qe.Event = e.Event
qe.Timestamp.Seconds = int64(e.Seconds)
qe.Timestamp.Microseconds = int64(e.Microseconds)
return &qe, nil
}
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