// run is the workhorse of the stream pump system. It facilitates the triggering
// of open streams by closing a new channel every time the input pump sends.
func run() {
for {
select {
case _, more := <-pump:
log.Debug(ctx, "sse pump")
prev := nextTick
nextTick = make(chan struct{})
// trigger all listeners by closing the nextTick channel
close(prev)
if !more {
return
}
case <-ctx.Done():
pump = nil
return
}
}
}
// NewLedgerClosePump starts a background proc that continually watches the
// history database provided. The watch is stopped after the provided context
// is cancelled.
//
// Every second, the proc spawned by calling this func will check to see
// if a new ledger has been imported (by ruby-horizon as of 2015-04-30, but
// should eventually end up being in this project). If a new ledger is seen
// the the channel returned by this function emits
func NewLedgerClosePump(ctx context.Context, db *sqlx.DB) <-chan struct{} {
result := make(chan struct{})
go func() {
var lastSeenLedger int32
for {
select {
case <-time.After(1 * time.Second):
var latestLedger int32
row := db.QueryRow(MaxHistoryLedger)
err := row.Scan(&latestLedger)
if err != nil {
log.Warn(ctx, "Failed to check latest ledger", err)
break
}
if latestLedger > lastSeenLedger {
log.Debugf(ctx, "saw new ledger: %d, prev: %d", latestLedger, lastSeenLedger)
select {
case result <- struct{}{}:
lastSeenLedger = latestLedger
default:
log.Debug(ctx, "ledger pump channel is blocked. waiting...")
}
} else if latestLedger < lastSeenLedger {
log.Warn(ctx, "latest ledger went backwards! reseting ledger pump")
lastSeenLedger = 0
}
case <-ctx.Done():
log.Info(ctx, "canceling ledger pump")
close(result)
return
}
}
}()
return result
}
// NewLedgerClosePump starts a background proc that continually watches the
// history database provided. The watch is stopped after the provided context
// is cancelled.
//
// Every second, the proc spawned by calling this func will check to see
// if a new ledger has been imported (by ruby-horizon as of 2015-04-30, but
// should eventually end up being in this project). If a new ledger is seen
// the the channel returned by this function emits
func NewLedgerClosePump(ctx context.Context, q *history.Q) <-chan struct{} {
result := make(chan struct{})
go func() {
var lastSeenLedger int32
for {
select {
case <-time.After(1 * time.Second):
var latestLedger int32
err := q.LatestLedger(&latestLedger)
if err != nil {
log.Warn("Failed to check latest ledger", err)
continue
}
if latestLedger > lastSeenLedger {
log.Debugf("saw new ledger: %d, prev: %d", latestLedger, lastSeenLedger)
select {
case result <- struct{}{}:
lastSeenLedger = latestLedger
default:
log.Debug("ledger pump channel is blocked. waiting...")
}
} else if latestLedger < lastSeenLedger {
log.Warn("latest ledger went backwards! reseting ledger pump")
lastSeenLedger = 0
}
case <-ctx.Done():
log.Info("canceling ledger pump")
close(result)
return
}
}
}()
return result
}
func (i *System) run() {
for _ = range i.tick.C {
log.Debug("ticking ingester")
i.runOnce()
}
}
