chainio: add helper methods to dispatch beats

This commit adds two methods to handle dispatching beats. These are
exported methods so other systems can send beats to their managed
subinstances.

chainio/mocks.go

@@ -0,0 +1,50 @@
+package chainio
+
+import (
+	"github.com/btcsuite/btclog/v2"
+	"github.com/stretchr/testify/mock"
+)
+
+// MockConsumer is a mock implementation of the Consumer interface.
+type MockConsumer struct {
+	mock.Mock
+}
+
+// Compile-time constraint to ensure MockConsumer implements Consumer.
+var _ Consumer = (*MockConsumer)(nil)
+
+// Name returns a human-readable string for this subsystem.
+func (m *MockConsumer) Name() string {
+	args := m.Called()
+	return args.String(0)
+}
+
+// ProcessBlock takes a blockbeat and processes it. A receive-only error chan
+// must be returned.
+func (m *MockConsumer) ProcessBlock(b Blockbeat) error {
+	args := m.Called(b)
+
+	return args.Error(0)
+}
+
+// MockBlockbeat is a mock implementation of the Blockbeat interface.
+type MockBlockbeat struct {
+	mock.Mock
+}
+
+// Compile-time constraint to ensure MockBlockbeat implements Blockbeat.
+var _ Blockbeat = (*MockBlockbeat)(nil)
+
+// Height returns the current block height.
+func (m *MockBlockbeat) Height() int32 {
+	args := m.Called()
+
+	return args.Get(0).(int32)
+}
+
+// logger returns the logger for the blockbeat.
+func (m *MockBlockbeat) logger() btclog.Logger {
+	args := m.Called()
+
+	return args.Get(0).(btclog.Logger)
+}