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passive.go
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passive.go
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package job
import (
"context"
"fmt"
"time"
"github.com/dsh2dsh/cron/v3"
"github.com/prometheus/client_golang/prometheus"
"github.com/dsh2dsh/zrepl/config"
"github.com/dsh2dsh/zrepl/daemon/logging"
"github.com/dsh2dsh/zrepl/daemon/logging/trace"
"github.com/dsh2dsh/zrepl/daemon/snapper"
"github.com/dsh2dsh/zrepl/endpoint"
"github.com/dsh2dsh/zrepl/rpc"
"github.com/dsh2dsh/zrepl/transport"
"github.com/dsh2dsh/zrepl/transport/fromconfig"
"github.com/dsh2dsh/zrepl/zfs"
)
type PassiveSide struct {
mode passiveMode
name endpoint.JobID
listen transport.AuthenticatedListenerFactory
}
type passiveMode interface {
Handler() rpc.Handler
RunPeriodic(ctx context.Context, cron *cron.Cron)
SnapperReport() *snapper.Report // may be nil
Type() Type
}
type modeSink struct {
receiverConfig endpoint.ReceiverConfig
}
func (m *modeSink) Type() Type { return TypeSink }
func (m *modeSink) Handler() rpc.Handler {
return endpoint.NewReceiver(m.receiverConfig)
}
func (m *modeSink) RunPeriodic(_ context.Context, cron *cron.Cron) {}
func (m *modeSink) SnapperReport() *snapper.Report { return nil }
func modeSinkFromConfig(g *config.Global, in *config.SinkJob, jobID endpoint.JobID) (m *modeSink, err error) {
m = &modeSink{}
m.receiverConfig, err = buildReceiverConfig(in, jobID)
if err != nil {
return nil, err
}
return m, nil
}
type modeSource struct {
senderConfig *endpoint.SenderConfig
snapper snapper.Snapper
}
func modeSourceFromConfig(g *config.Global, in *config.SourceJob, jobID endpoint.JobID) (m *modeSource, err error) {
// FIXME exact dedup of modePush
m = &modeSource{}
m.senderConfig, err = buildSenderConfig(in, jobID)
if err != nil {
return nil, fmt.Errorf("send options: %w", err)
}
if m.snapper, err = snapper.FromConfig(g, m.senderConfig.FSF, in.Snapshotting); err != nil {
return nil, fmt.Errorf("cannot build snapper: %w", err)
}
return m, nil
}
func (m *modeSource) Type() Type { return TypeSource }
func (m *modeSource) Handler() rpc.Handler {
return endpoint.NewSender(*m.senderConfig)
}
func (m *modeSource) RunPeriodic(ctx context.Context, cron *cron.Cron) {
go m.snapper.Run(ctx, nil, cron)
}
func (m *modeSource) SnapperReport() *snapper.Report {
r := m.snapper.Report()
return &r
}
func passiveSideFromConfig(g *config.Global, in *config.PassiveJob, configJob interface{}, parseFlags config.ParseFlags) (s *PassiveSide, err error) {
s = &PassiveSide{}
s.name, err = endpoint.MakeJobID(in.Name)
if err != nil {
return nil, fmt.Errorf("invalid job name: %w", err)
}
switch v := configJob.(type) {
case *config.SinkJob:
s.mode, err = modeSinkFromConfig(g, v, s.name) // shadow
case *config.SourceJob:
s.mode, err = modeSourceFromConfig(g, v, s.name) // shadow
}
if err != nil {
return nil, err // no wrapping necessary
}
if s.listen, err = fromconfig.ListenerFactoryFromConfig(g, in.Serve, parseFlags); err != nil {
return nil, fmt.Errorf("cannot build listener factory: %w", err)
}
return s, nil
}
func (j *PassiveSide) Name() string { return j.name.String() }
func (s *PassiveSide) Status() *Status {
st := &PassiveStatus{
Snapper: s.mode.SnapperReport(),
}
return &Status{Type: s.mode.Type(), JobSpecific: st}
}
type PassiveStatus struct {
Snapper *snapper.Report
}
func (self *PassiveStatus) Error() string {
if snap := self.Snapper; snap != nil {
if s := snap.Error(); s != "" {
return s
}
}
return ""
}
func (self *PassiveStatus) Running() time.Duration {
if snap := self.Snapper; snap != nil {
return snap.Running()
}
return 0
}
func (j *PassiveSide) OwnedDatasetSubtreeRoot() (rfs *zfs.DatasetPath, ok bool) {
sink, ok := j.mode.(*modeSink)
if !ok {
_ = j.mode.(*modeSource) // make sure we didn't introduce a new job type
return nil, false
}
return sink.receiverConfig.RootWithoutClientComponent.Copy(), true
}
func (j *PassiveSide) SenderConfig() *endpoint.SenderConfig {
source, ok := j.mode.(*modeSource)
if !ok {
_ = j.mode.(*modeSink) // make sure we didn't introduce a new job type
return nil
}
return source.senderConfig
}
func (*PassiveSide) RegisterMetrics(registerer prometheus.Registerer) {}
func (j *PassiveSide) Run(ctx context.Context, cron *cron.Cron) {
ctx, endTask := trace.WithTaskAndSpan(ctx, "passive-side-job", j.Name())
defer endTask()
log := GetLogger(ctx)
defer log.Info("job exiting")
{
ctx, endTask := trace.WithTask(ctx, "periodic") // shadowing
defer endTask()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
j.mode.RunPeriodic(ctx, cron)
}
handler := j.mode.Handler()
if handler == nil {
panic(fmt.Sprintf("implementation error: j.mode.Handler() returned nil: %#v", j))
}
ctxInterceptor := func(handlerCtx context.Context, info rpc.HandlerContextInterceptorData, handler func(ctx context.Context)) {
// the handlerCtx is clean => need to inherit logging and tracing config from job context
handlerCtx = logging.WithInherit(handlerCtx, ctx)
handlerCtx = trace.WithInherit(handlerCtx, ctx)
handlerCtx, endTask := trace.WithTaskAndSpan(handlerCtx, "handler", fmt.Sprintf("job=%q client=%q method=%q", j.Name(), info.ClientIdentity(), info.FullMethod()))
defer endTask()
handler(handlerCtx)
}
rpcLoggers := rpc.GetLoggersOrPanic(ctx) // WithSubsystemLoggers above
server := rpc.NewServer(handler, rpcLoggers, ctxInterceptor)
listener, err := j.listen()
if err != nil {
log.WithError(err).Error("cannot listen")
return
}
server.Serve(ctx, listener)
}