Revert "delete everything" (includes everything non-go-crypto)

This reverts commit 96a3502

types/event_buffer.go

@@ -0,0 +1,50 @@
+package types
+
+// Interface assertions
+var _ TxEventPublisher = (*TxEventBuffer)(nil)
+
+// TxEventBuffer is a buffer of events, which uses a slice to temporarily store
+// events.
+type TxEventBuffer struct {
+	next     TxEventPublisher
+	capacity int
+	events   []EventDataTx
+}
+
+// NewTxEventBuffer accepts a TxEventPublisher and returns a new buffer with the given
+// capacity.
+func NewTxEventBuffer(next TxEventPublisher, capacity int) *TxEventBuffer {
+	return &TxEventBuffer{
+		next:     next,
+		capacity: capacity,
+		events:   make([]EventDataTx, 0, capacity),
+	}
+}
+
+// Len returns the number of events cached.
+func (b TxEventBuffer) Len() int {
+	return len(b.events)
+}
+
+// PublishEventTx buffers an event to be fired upon finality.
+func (b *TxEventBuffer) PublishEventTx(e EventDataTx) error {
+	b.events = append(b.events, e)
+	return nil
+}
+
+// Flush publishes events by running next.PublishWithTags on all cached events.
+// Blocks. Clears cached events.
+func (b *TxEventBuffer) Flush() error {
+	for _, e := range b.events {
+		err := b.next.PublishEventTx(e)
+		if err != nil {
+			return err
+		}
+	}
+
+	// Clear out the elements and set the length to 0
+	// but maintain the underlying slice's capacity.
+	// See Issue https://github.com/tendermint/tendermint/issues/1189
+	b.events = b.events[:0]
+	return nil
+}