创建矿工

miner/worker.go

func newWorker(config *Config, chainConfig *params.ChainConfig, engine consensus.Engine, eth Backend, mux *event.TypeMux, isLocalBlock func(*types.Block) bool, init bool) *worker {
 ...
worker.wg.Add(4)
    go worker.mainLoop()
    go worker.newWorkLoop(recommit)
    go worker.resultLoop()
    go worker.taskLoop()

接收任务

// newWorkLoop is a standalone goroutine to submit new mining work upon received events.
func (w *worker) newWorkLoop(recommit time.Duration) {
...
// commit aborts in-flight transaction execution with given signal and resubmits a new one.
    commit := func(noempty bool, s int32) {
        if interrupt != nil {
            atomic.StoreInt32(interrupt, s)
        }
        interrupt = new(int32)
        select {
        case w.newWorkCh <- &newWorkReq{interrupt: interrupt, noempty: noempty, timestamp: timestamp}: //接收任务

任务传递

// mainLoop is a standalone goroutine to regenerate the sealing task based on the received event.
func (w *worker) mainLoop() {
....

    for {
        select {
        case req := <-w.newWorkCh:
            w.commitNewWork(req.interrupt, req.noempty, req.timestamp) // 提交任务

开始提交

// commitNewWork generates several new sealing tasks based on the parent block.
func (w *worker) commitNewWork(interrupt *int32, noempty bool, timestamp int64) {
    ...
    w.commit(uncles, w.fullTaskHook, true, tstart) // 开始提交

组装区块

func (w *worker) commit(uncles []*types.Header, interval func(), update bool, start time.Time) error {
...
    block, receipts, err := w.engine.FinalizeAndAssemble(w.chain, w.current.header, s, txs, uncles, cpyReceipts) // 通过对应共识组装最后区块
    if err != nil {
        return err
    }
    if w.isRunning() {
        if interval != nil {
            interval()
        }
        select {
        case w.taskCh <- &task{receipts: receipts, state: s, block: block, createdAt: time.Now()}: //开始广播区块

func (w *worker) taskLoop() {
     ...
        if err := w.engine.Seal(w.chain, task.block, w.resultCh, stopCh); err != nil { // 开始矿工签名
                log.Warn("Block sealing failed", "err", err)
                w.pendingMu.Lock()
                delete(w.pendingTasks, sealHash)
                w.pendingMu.Unlock()
            }

矿工签名

func (c *Congress) Seal(chain consensus.ChainHeaderReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error {
// Sign all the things!
    sighash, err := signFn(accounts.Account{Address: val}, accounts.MimetypeCongress, CongressRLP(header))
    if err != nil {
        return err
    }
    copy(header.Extra[len(header.Extra)-extraSeal:], sighash) //将签名放到区块header.Extra字段

    // Wait until sealing is terminated or delay timeout.
    log.Trace("Waiting for slot to sign and propagate", "delay", common.PrettyDuration(delay))
    go func() {
        select {
        case <-stop:
            return
        case <-time.After(delay):
        }

        select {
        case results <- block.WithSeal(header): // 返回给上一步的 w.resultCh
        default:
            log.Warn("Sealing result is not read by miner", "sealhash", SealHash(header))
        }
    }()

广播区块

func (w *worker) resultLoop() {
    defer w.wg.Done()
    for {
        select {
        case block := <-w.resultCh: // 接收到上步矿工签名的区块
        ...
        // Commit block and state to database.
        _, err := w.chain.WriteBlockWithState(block, receipts, logs, task.state, true) // 更新本地数据
        ...
        // Broadcast the block and announce chain insertion event
            w.mux.Post(core.NewMinedBlockEvent{Block: block}) // 广播区块

            // Insert the block into the set of pending ones to resultLoop for confirmations
            w.unconfirmed.Insert(block.NumberU64(), block.Hash())

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