/
jettreeupdater.go
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/
jettreeupdater.go
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/*
* Copyright 2019 Insolar Technologies
*
* 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 artifactmanager
import (
"context"
"sync"
"github.com/insolar/insolar"
"github.com/insolar/insolar/ledger/storage/nodes"
"github.com/pkg/errors"
"github.com/insolar/insolar/core"
"github.com/insolar/insolar/core/message"
"github.com/insolar/insolar/core/reply"
"github.com/insolar/insolar/instrumentation/inslogger"
"github.com/insolar/insolar/instrumentation/instracer"
"github.com/insolar/insolar/ledger/storage"
"github.com/insolar/insolar/ledger/storage/jet"
)
type seqEntry struct {
ch chan struct{}
once sync.Once
}
type seqKey struct {
pulse core.PulseNumber
jet core.RecordID
}
type fetchResult struct {
jet *core.RecordID
err error
}
type jetTreeUpdater struct {
Nodes nodes.Accessor
JetStorage storage.JetStorage
MessageBus core.MessageBus
JetCoordinator core.JetCoordinator
seqMutex sync.Mutex
sequencer map[seqKey]*seqEntry
}
func newJetTreeUpdater(
ans nodes.Accessor,
js storage.JetStorage, mb core.MessageBus, jc core.JetCoordinator,
) *jetTreeUpdater {
return &jetTreeUpdater{
Nodes: ans,
JetStorage: js,
MessageBus: mb,
JetCoordinator: jc,
sequencer: map[seqKey]*seqEntry{},
}
}
func (jtu *jetTreeUpdater) fetchJet(
ctx context.Context, target core.RecordID, pulse core.PulseNumber,
) (*core.RecordID, error) {
ctx, span := instracer.StartSpan(ctx, "jet_tree_updater.fetch_jet")
defer span.End()
// Look in the local tree. Return if the actual jet found.
jetID, actual := jtu.JetStorage.FindJet(ctx, pulse, target)
if actual {
return jetID, nil
}
// Not actual in our tree, asking neighbors for jet.
span.Annotate(nil, "tree in DB is not actual")
key := seqKey{pulse, *jetID}
executing := false
jtu.seqMutex.Lock()
if _, ok := jtu.sequencer[key]; !ok {
jtu.sequencer[key] = &seqEntry{ch: make(chan struct{})}
executing = true
}
entry := jtu.sequencer[key]
jtu.seqMutex.Unlock()
span.Annotate(nil, "got sequencer entry")
if !executing {
<-entry.ch
// Tree was updated in another thread, rechecking.
span.Annotate(nil, "somebody else updated actuality")
return jtu.fetchJet(ctx, target, pulse)
}
defer func() {
entry.once.Do(func() {
close(entry.ch)
})
jtu.seqMutex.Lock()
delete(jtu.sequencer, key)
jtu.seqMutex.Unlock()
}()
resJet, err := jtu.fetchActualJetFromOtherNodes(ctx, target, pulse)
if err != nil {
return nil, err
}
jtu.JetStorage.UpdateJetTree(ctx, pulse, true, *resJet)
return resJet, nil
}
func (jtu *jetTreeUpdater) releaseJet(ctx context.Context, jetID core.RecordID, pulse core.PulseNumber) {
jtu.seqMutex.Lock()
defer jtu.seqMutex.Unlock()
depth, _ := jet.Jet(jetID)
for {
key := seqKey{pulse, jetID}
if v, ok := jtu.sequencer[key]; ok {
v.once.Do(func() {
close(v.ch)
})
delete(jtu.sequencer, key)
}
if depth == 0 {
break
}
jetID = jet.Parent(jetID)
depth--
}
}
func (jtu *jetTreeUpdater) fetchActualJetFromOtherNodes(
ctx context.Context, target core.RecordID, pulse core.PulseNumber,
) (*core.RecordID, error) {
ctx, span := instracer.StartSpan(ctx, "jet_tree_updater.fetch_jet_from_other_nodes")
defer span.End()
ch := make(chan fetchResult, 1)
go func() {
nodes, err := jtu.otherNodesForPulse(ctx, pulse)
if err != nil {
ch <- fetchResult{nil, err}
return
}
num := len(nodes)
wg := sync.WaitGroup{}
wg.Add(num)
once := sync.Once{}
replies := make([]*reply.Jet, num)
for i, node := range nodes {
go func(i int, node insolar.Node) {
ctx, span := instracer.StartSpan(ctx, "jet_tree_updater.one_node_get_jet")
defer span.End()
defer wg.Done()
nodeID := node.ID
rep, err := jtu.MessageBus.Send(
ctx,
&message.GetJet{Object: target, Pulse: pulse},
&core.MessageSendOptions{Receiver: &nodeID},
)
if err != nil {
inslogger.FromContext(ctx).Error(
errors.Wrap(err, "couldn't get jet"),
)
return
}
r, ok := rep.(*reply.Jet)
if !ok {
inslogger.FromContext(ctx).Errorf("middleware.fetchActualJetFromOtherNodes: unexpected reply: %#v\n", rep)
return
}
if !r.Actual {
return
}
once.Do(func() {
jetID := r.ID
ch <- fetchResult{&jetID, nil}
close(ch)
})
replies[i] = r
}(i, node)
}
wg.Wait()
seen := make(map[core.RecordID]struct{})
res := make([]*core.RecordID, 0)
for _, r := range replies {
if r == nil {
continue
}
if _, ok := seen[r.ID]; ok {
continue
}
seen[r.ID] = struct{}{}
res = append(res, &r.ID)
}
if len(res) == 0 {
inslogger.FromContext(ctx).WithFields(map[string]interface{}{
"pulse": pulse,
"object": target.DebugString(),
}).Error("all lights for pulse have no actual jet for object")
ch <- fetchResult{nil, errors.New("impossible situation")}
close(ch)
} else if len(res) > 1 {
inslogger.FromContext(ctx).WithFields(map[string]interface{}{
"pulse": pulse,
"object": target.DebugString(),
}).Error("lights said different actual jet for object")
}
}()
res := <-ch
return res.jet, res.err
}
func (jtu *jetTreeUpdater) otherNodesForPulse(
ctx context.Context, pulse core.PulseNumber,
) ([]insolar.Node, error) {
ctx, span := instracer.StartSpan(ctx, "jet_tree_updater.other_nodes_for_pulse")
defer span.End()
res, err := jtu.Nodes.InRole(pulse, core.StaticRoleLightMaterial)
if err != nil {
return nil, err
}
me := jtu.JetCoordinator.Me()
for i := range res {
if res[i].ID == me {
res = append(res[:i], res[i+1:]...)
break
}
}
num := len(res)
if num == 0 {
inslogger.FromContext(ctx).Error(
"This shouldn't happen. We're solo active light material",
)
return nil, errors.New("impossible situation")
}
return res, nil
}