/
contract_lock.go
119 lines (103 loc) · 2.96 KB
/
contract_lock.go
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package worker
import (
"context"
"errors"
"fmt"
"sync"
"time"
"go.sia.tech/core/types"
"go.uber.org/zap"
)
type ContractLocker interface {
AcquireContract(ctx context.Context, fcid types.FileContractID, priority int, d time.Duration) (lockID uint64, err error)
KeepaliveContract(ctx context.Context, fcid types.FileContractID, lockID uint64, d time.Duration) (err error)
ReleaseContract(ctx context.Context, fcid types.FileContractID, lockID uint64) (err error)
}
var _ ContractLocker = (Bus)(nil)
type contractLock struct {
lockID uint64
fcid types.FileContractID
d time.Duration
locker ContractLocker
logger *zap.SugaredLogger
keepaliveLoopCtx context.Context
keepaliveLoopCtxCancel context.CancelFunc
stopWG sync.WaitGroup
}
func newContractLock(ctx context.Context, fcid types.FileContractID, lockID uint64, d time.Duration, locker ContractLocker, logger *zap.SugaredLogger) *contractLock {
ctx, cancel := context.WithCancel(ctx)
cl := &contractLock{
lockID: lockID,
fcid: fcid,
d: d,
locker: locker,
logger: logger,
keepaliveLoopCtx: ctx,
keepaliveLoopCtxCancel: cancel,
}
cl.stopWG.Add(1)
go func() {
cl.keepaliveLoop()
cl.stopWG.Done()
}()
return cl
}
func (w *worker) acquireContractLock(ctx context.Context, fcid types.FileContractID, priority int) (_ *contractLock, err error) {
lockID, err := w.bus.AcquireContract(ctx, fcid, priority, w.contractLockingDuration)
if err != nil {
return nil, err
}
return newContractLock(w.shutdownCtx, fcid, lockID, w.contractLockingDuration, w.bus, w.logger), nil
}
func (w *worker) withContractLock(ctx context.Context, fcid types.FileContractID, priority int, fn func() error) error {
contractLock, err := w.acquireContractLock(ctx, fcid, priority)
if err != nil {
return err
}
defer func() {
releaseCtx, cancel := context.WithTimeout(w.shutdownCtx, 10*time.Second)
_ = contractLock.Release(releaseCtx)
cancel()
}()
return fn()
}
func (cl *contractLock) Release(ctx context.Context) error {
// Stop background loop.
cl.keepaliveLoopCtxCancel()
cl.stopWG.Wait()
// Release the contract.
return cl.locker.ReleaseContract(ctx, cl.fcid, cl.lockID)
}
func (cl *contractLock) keepaliveLoop() {
// Create ticker for 20% of the lock duration.
start := time.Now()
var lastUpdate time.Time
tickDuration := cl.d / 5
t := time.NewTicker(tickDuration)
// Cleanup
defer func() {
t.Stop()
select {
case <-t.C:
default:
}
}()
// Loop until stopped.
for {
select {
case <-cl.keepaliveLoopCtx.Done():
return // released
case <-t.C:
}
if err := cl.locker.KeepaliveContract(cl.keepaliveLoopCtx, cl.fcid, cl.lockID, cl.d); err != nil && !errors.Is(err, context.Canceled) {
cl.logger.Errorw(fmt.Sprintf("failed to send keepalive: %v", err),
"contract", cl.fcid,
"lockID", cl.lockID,
"loopStart", start,
"timeSinceLastUpdate", time.Since(lastUpdate),
"tickDuration", tickDuration)
return
}
lastUpdate = time.Now()
}
}