415ac4596a
This commit changes the way that orphan blocks are identified by adding a new boolean return value on ProcessBlock and removing the notification for NTOrphanBlock. This allows the calling code to identify orphan blocks immediately instead of having to setup a seperate callback handler and implementing some type of state tracking. This, in turn, allows cleaner code for handling them. In addition, the tests have been updated for the new function signature and also now check that each block is or is not an orphan as expected which makes the tests more robust. ok @jrick
74 lines
2.3 KiB
Go
74 lines
2.3 KiB
Go
// Copyright (c) 2013-2014 Conformal Systems LLC.
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package btcchain
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import (
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"fmt"
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)
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// NotificationType represents the type of a notification message.
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type NotificationType int
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// NotificationCallback is used for a caller to provide a callback for
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// notifications about various chain events.
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type NotificationCallback func(*Notification)
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// Constants for the type of a notification message.
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const (
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// NTBlockAccepted indicates the associated block was accepted into
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// the block chain. Note that this does not necessarily mean it was
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// added to the main chain. For that, use NTBlockConnected.
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NTBlockAccepted NotificationType = iota
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// NTBlockConnected indicates the associated block was connected to the
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// main chain.
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NTBlockConnected
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// NTBlockDisconnected indicates the associated block was disconnected
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// from the main chain.
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NTBlockDisconnected
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)
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// notificationTypeStrings is a map of notification types back to their constant
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// names for pretty printing.
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var notificationTypeStrings = map[NotificationType]string{
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NTBlockAccepted: "NTBlockAccepted",
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NTBlockConnected: "NTBlockConnected",
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NTBlockDisconnected: "NTBlockDisconnected",
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}
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// String returns the NotificationType in human-readable form.
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func (n NotificationType) String() string {
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if s, ok := notificationTypeStrings[n]; ok {
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return s
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}
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return fmt.Sprintf("Unknown Notification Type (%d)", int(n))
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}
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// Notification defines notification that is sent to the caller via the callback
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// function provided during the call to New and consists of a notification type
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// as well as associated data that depends on the type as follows:
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// - NTBlockAccepted: *btcutil.Block
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// - NTBlockConnected: *btcutil.Block
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// - NTBlockDisconnected: *btcutil.Block
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type Notification struct {
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Type NotificationType
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Data interface{}
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}
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// sendNotification sends a notification with the passed type and data if the
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// caller requested notifications by providing a callback function in the call
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// to New.
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func (b *BlockChain) sendNotification(typ NotificationType, data interface{}) {
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// Ignore it if the caller didn't request notifications.
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if b.notifications == nil {
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return
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}
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// Generate and send the notification.
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n := Notification{Type: typ, Data: data}
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b.notifications(&n)
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}
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