func (s *WorkerState) offer(log bitwrk.Logger) {
defer log.Printf("Stopped offering")
s.cond.L.Lock()
defer s.cond.L.Unlock()
interrupt := make(chan bool, 1)
for {
// Interrupt if unregistered, stop iterating
if s.Unregistered {
log.Printf("No longer registered")
interrupt <- true
break
}
if s.Blockers == 0 {
s.LastError = ""
if sell, err := s.m.activityManager.NewSell(s); err != nil {
s.LastError = fmt.Sprintf("Error creating sell: %v", err)
log.Println(s.LastError)
s.blockFor(20 * time.Second)
} else {
s.Blockers++
go s.executeSell(log, sell, interrupt)
}
}
s.cond.Wait()
}
}
// Manages the complete lifecycle of a sell
func (a *SellActivity) PerformSell(log bitwrk.Logger, receiveManager *ReceiveManager, interrupt <-chan bool) error {
defer log.Println("Sell finished")
err := a.doPerformSell(log, receiveManager, interrupt)
if err != nil {
a.lastError = err
}
a.alive = false
return err
}
func (s *WorkerState) executeSell(log bitwrk.Logger, sell *SellActivity, interrupt <-chan bool) {
defer func() {
s.cond.L.Lock()
s.Blockers--
s.cond.Broadcast()
s.cond.L.Unlock()
}()
defer sell.Dispose()
if err := sell.PerformSell(log.Newf("Sell #%v", sell.GetKey()), s.m.receiveManager, interrupt); err != nil {
s.LastError = fmt.Sprintf("Error performing sell (delaying next sell by 20s): %v", err)
log.Println(s.LastError)
s.cond.L.Lock()
s.blockFor(20 * time.Second)
s.cond.L.Unlock()
} else {
log.Printf("Returned from PerformSell successfully")
}
}
func (a *SellActivity) HandleWork(log bitwrk.Logger, workFile cafs.File, buyerSecret bitwrk.Thash) (io.ReadCloser, error) {
// Wait for buyer to establish
active := true
var workHash, workSecretHash *bitwrk.Thash
log.Printf("Watching transaction state...")
a.waitWhile(func() bool {
active = a.tx.State == bitwrk.StateActive
workHash, workSecretHash = a.tx.WorkHash, a.tx.WorkSecretHash
log.Printf(" state: %v phase: %v", a.tx.State, a.tx.Phase)
return active && a.tx.Phase != bitwrk.PhaseTransmitting
})
if !active {
return nil, fmt.Errorf("Transaction timed out waiting for buyer to establish")
}
// Verify work hash
if *workHash != bitwrk.Thash(workFile.Key()) {
return nil, fmt.Errorf("WorkHash and received data do not match")
}
if err := verifyBuyerSecret(workHash, workSecretHash, &buyerSecret); err != nil {
return nil, err
}
log.Println("Got valid work data. Publishing buyer's secret.")
if err := SendTxMessagePublishBuyerSecret(a.txId, a.identity, &buyerSecret); err != nil {
return nil, fmt.Errorf("Error publishing buyer's secret: %v", err)
}
log.Println("Starting to work...")
r, err := a.dispatchWork(log, workFile)
if err != nil {
log.Printf("Rejecting work because of error '%v'", err)
if err := SendTxMessageRejectWork(a.txId, a.identity); err != nil {
log.Printf("Rejecting work failed: %v", err)
}
}
return r, err
}
func (a *Trade) beginTrade(log bitwrk.Logger, interrupt <-chan bool) error {
// wait for grant or reject
log.Println("Waiting for permission")
// Get a permission for the sell
if err := a.awaitPermission(interrupt); err != nil {
return fmt.Errorf("Error awaiting permission: %v", err)
}
log.Printf("Got permission. Price: %v", a.price)
// Prevent too many unmatched bids on server
key := fmt.Sprintf("%v-%v", a.bidType, a.article)
if err := a.manager.checkoutToken(key, NumUnmatchedBids, interrupt); err != nil {
return err
}
defer a.manager.returnToken(key)
if err := a.awaitBid(); err != nil {
return fmt.Errorf("Error awaiting bid: %v", err)
}
log.Printf("Got bid id: %v", a.bidId)
if err := a.awaitTransaction(log); err != nil {
return fmt.Errorf("Error awaiting transaction: %v", err)
}
log.Printf("Got transaction id: %v", a.txId)
if tx, etag, err := FetchTx(a.txId, ""); err != nil {
return err
} else {
a.tx = tx
a.txETag = etag
}
return nil
}
