/
scheduler.go
201 lines (168 loc) · 4.88 KB
/
scheduler.go
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// Package scheduler implements the tendermint backed scheduling backend.
package scheduler
import (
"bytes"
"context"
"fmt"
"github.com/eapache/channels"
tmtypes "github.com/tendermint/tendermint/types"
"github.com/oasislabs/oasis-core/go/common/cbor"
"github.com/oasislabs/oasis-core/go/common/logging"
"github.com/oasislabs/oasis-core/go/common/pubsub"
consensus "github.com/oasislabs/oasis-core/go/consensus/api"
app "github.com/oasislabs/oasis-core/go/consensus/tendermint/apps/scheduler"
"github.com/oasislabs/oasis-core/go/consensus/tendermint/service"
"github.com/oasislabs/oasis-core/go/scheduler/api"
)
var _ api.Backend = (*tendermintBackend)(nil)
type tendermintBackend struct {
logger *logging.Logger
service service.TendermintService
querier *app.QueryFactory
notifier *pubsub.Broker
}
func (tb *tendermintBackend) StateToGenesis(ctx context.Context, height int64) (*api.Genesis, error) {
q, err := tb.querier.QueryAt(ctx, height)
if err != nil {
return nil, fmt.Errorf("scheduler: genesis query failed: %w", err)
}
return q.Genesis(ctx)
}
func (tb *tendermintBackend) Cleanup() {
}
func (tb *tendermintBackend) GetValidators(ctx context.Context, height int64) ([]*api.Validator, error) {
q, err := tb.querier.QueryAt(ctx, height)
if err != nil {
return nil, err
}
return q.Validators(ctx)
}
func (tb *tendermintBackend) GetCommittees(ctx context.Context, request *api.GetCommitteesRequest) ([]*api.Committee, error) {
q, err := tb.querier.QueryAt(ctx, request.Height)
if err != nil {
return nil, err
}
committees, err := q.AllCommittees(ctx)
if err != nil {
return nil, err
}
var runtimeCommittees []*api.Committee
for _, c := range committees {
if c.RuntimeID.Equal(&request.RuntimeID) {
runtimeCommittees = append(runtimeCommittees, c)
}
}
return runtimeCommittees, nil
}
func (tb *tendermintBackend) WatchCommittees(ctx context.Context) (<-chan *api.Committee, pubsub.ClosableSubscription, error) {
typedCh := make(chan *api.Committee)
sub := tb.notifier.Subscribe()
sub.Unwrap(typedCh)
return typedCh, sub, nil
}
func (tb *tendermintBackend) getCurrentCommittees() ([]*api.Committee, error) {
q, err := tb.querier.QueryAt(context.TODO(), consensus.HeightLatest)
if err != nil {
return nil, err
}
return q.AllCommittees(context.TODO())
}
func (tb *tendermintBackend) worker(ctx context.Context) {
// Subscribe to blocks which elect committees.
sub, err := tb.service.Subscribe("scheduler-worker", app.QueryApp)
if err != nil {
tb.logger.Error("failed to subscribe",
"err", err,
)
return
}
defer func() {
err := tb.service.Unsubscribe("scheduler-worker", app.QueryApp)
if err != nil {
tb.logger.Error("failed to unsubscribe",
"err", err,
)
}
}()
for {
var event interface{}
select {
case msg := <-sub.Out():
event = msg.Data()
case <-sub.Cancelled():
tb.logger.Debug("worker: terminating, subscription closed")
return
case <-ctx.Done():
return
}
switch ev := event.(type) {
case tmtypes.EventDataNewBlock:
tb.onEventDataNewBlock(ctx, ev)
default:
}
}
}
// Called from worker.
func (tb *tendermintBackend) onEventDataNewBlock(ctx context.Context, ev tmtypes.EventDataNewBlock) {
events := ev.ResultBeginBlock.GetEvents()
for _, tmEv := range events {
if tmEv.GetType() != app.EventType {
continue
}
for _, pair := range tmEv.GetAttributes() {
if bytes.Equal(pair.GetKey(), app.KeyElected) {
var kinds []api.CommitteeKind
if err := cbor.Unmarshal(pair.GetValue(), &kinds); err != nil {
tb.logger.Error("worker: malformed elected committee types list",
"err", err,
)
continue
}
q, err := tb.querier.QueryAt(ctx, ev.Block.Header.Height)
if err != nil {
tb.logger.Error("worker: couldn't query elected committees",
"err", err,
)
continue
}
committees, err := q.KindsCommittees(ctx, kinds)
if err != nil {
tb.logger.Error("worker: couldn't query elected committees",
"err", err,
)
continue
}
for _, c := range committees {
tb.notifier.Broadcast(c)
}
}
}
}
}
// New constracts a new tendermint-based scheduler Backend instance.
func New(ctx context.Context, service service.TendermintService) (api.Backend, error) {
// Initialze and register the tendermint service component.
a := app.New()
if err := service.RegisterApplication(a); err != nil {
return nil, err
}
tb := &tendermintBackend{
logger: logging.GetLogger("scheduler/tendermint"),
service: service,
querier: a.QueryFactory().(*app.QueryFactory),
}
tb.notifier = pubsub.NewBrokerEx(func(ch channels.Channel) {
currentCommittees, err := tb.getCurrentCommittees()
if err != nil {
tb.logger.Error("couldn't get current committees. won't send them. good luck to the subscriber",
"err", err,
)
return
}
for _, c := range currentCommittees {
ch.In() <- c
}
})
go tb.worker(ctx)
return tb, nil
}