166 lines
3.2 KiB
Go
166 lines
3.2 KiB
Go
package events
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import (
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"sync"
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"github.com/filecoin-project/go-lotus/chain/types"
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)
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type heightEvents struct {
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lk sync.Mutex
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tsc *tipSetCache
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gcConfidence uint64
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ctr triggerId
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heightTriggers map[triggerId]*heightHandler
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htTriggerHeights map[triggerH][]triggerId
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htHeights map[msgH][]triggerId
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}
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func (e *heightEvents) headChangeAt(rev, app []*types.TipSet) error {
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// highest tipset is always the first (see api.ReorgOps)
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newH := app[0].Height()
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for _, ts := range rev {
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// TODO: log error if h below gcconfidence
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// revert height-based triggers
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revert := func(h uint64, ts *types.TipSet) {
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for _, tid := range e.htHeights[h] {
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// don't revert if newH is above this ts
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if newH >= h {
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continue
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}
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err := e.heightTriggers[tid].revert(ts)
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if err != nil {
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log.Errorf("reverting chain trigger (@H %d): %s", h, err)
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}
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}
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}
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revert(ts.Height(), ts)
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subh := ts.Height() - 1
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for {
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cts, err := e.tsc.get(subh)
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if err != nil {
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return err
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}
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if cts != nil {
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break
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}
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revert(subh, ts)
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subh--
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}
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if err := e.tsc.revert(ts); err != nil {
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return err
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}
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}
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tail := len(app) - 1
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for i := range app {
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ts := app[tail-i]
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if err := e.tsc.add(ts); err != nil {
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return err
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}
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// height triggers
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apply := func(h uint64, ts *types.TipSet) error {
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for _, tid := range e.htTriggerHeights[h] {
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hnd := e.heightTriggers[tid]
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triggerH := h - uint64(hnd.confidence)
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incTs, err := e.tsc.getNonNull(triggerH)
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if err != nil {
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return err
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}
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if err := hnd.handle(incTs, h); err != nil {
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log.Errorf("chain trigger (@H %d, called @ %d) failed: %s", triggerH, ts.Height(), err)
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}
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}
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return nil
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}
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if err := apply(ts.Height(), ts); err != nil {
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return err
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}
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subh := ts.Height() - 1
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for {
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cts, err := e.tsc.get(subh)
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if err != nil {
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return err
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}
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if cts != nil {
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break
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}
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if err := apply(subh, ts); err != nil {
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return err
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}
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subh--
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}
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}
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return nil
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}
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// ChainAt invokes the specified `HeightHandler` when the chain reaches the
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// specified height+confidence threshold. If the chain is rolled-back under the
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// specified height, `RevertHandler` will be called.
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//
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// ts passed to handlers is the tipset at the specified, or above, if lower tipsets were null
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func (e *heightEvents) ChainAt(hnd HeightHandler, rev RevertHandler, confidence int, h uint64) error {
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e.lk.Lock() // Tricky locking, check your locks if you modify this function!
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bestH := e.tsc.best().Height()
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if bestH >= h+uint64(confidence) {
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ts, err := e.tsc.get(h)
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if err != nil {
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log.Warnf("events.ChainAt: calling HandleFunc with nil tipset, not found in cache: %s", err)
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}
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e.lk.Unlock()
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if err := hnd(ts, bestH); err != nil {
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return err
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}
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e.lk.Lock()
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bestH = e.tsc.best().Height()
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}
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defer e.lk.Unlock()
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if bestH >= h+uint64(confidence)+e.gcConfidence {
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return nil
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}
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triggerAt := h + uint64(confidence)
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id := e.ctr
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e.ctr++
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e.heightTriggers[id] = &heightHandler{
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confidence: confidence,
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handle: hnd,
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revert: rev,
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}
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e.htHeights[h] = append(e.htHeights[h], id)
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e.htTriggerHeights[triggerAt] = append(e.htTriggerHeights[triggerAt], id)
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return nil
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}
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