97 lines
3.3 KiB
Go
97 lines
3.3 KiB
Go
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package statediff
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import (
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"context"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/rpc"
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)
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// APIName is the namespace used for the state diffing service API
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const APIName = "statediff"
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// APIVersion is the version of the state diffing service API
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const APIVersion = "0.0.1"
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// PublicStateDiffAPI provides an RPC subscription interface
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// that can be used to stream out state diffs as they
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// are produced by a full node
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type PublicStateDiffAPI struct {
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sds IService
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}
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// NewPublicStateDiffAPI creates an rpc subscription interface for the underlying statediff service
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func NewPublicStateDiffAPI(sds IService) *PublicStateDiffAPI {
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return &PublicStateDiffAPI{
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sds: sds,
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}
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}
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// Stream is the public method to setup a subscription that fires off statediff service payloads as they are created
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func (api *PublicStateDiffAPI) Stream(ctx context.Context, params Params) (*rpc.Subscription, error) {
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// ensure that the RPC connection supports subscriptions
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notifier, supported := rpc.NotifierFromContext(ctx)
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if !supported {
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return nil, rpc.ErrNotificationsUnsupported
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}
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// create subscription and start waiting for events
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rpcSub := notifier.CreateSubscription()
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go func() {
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// subscribe to events from the statediff service
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payloadChannel := make(chan Payload, chainEventChanSize)
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quitChan := make(chan bool, 1)
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api.sds.Subscribe(rpcSub.ID, payloadChannel, quitChan, params)
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// loop and await payloads and relay them to the subscriber with the notifier
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for {
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select {
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case payload := <-payloadChannel:
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if notifyErr := notifier.Notify(rpcSub.ID, payload); notifyErr != nil {
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log.Error("Failed to send state diff packet; error: " + notifyErr.Error())
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unSubErr := api.sds.Unsubscribe(rpcSub.ID)
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if unSubErr != nil {
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log.Error("Failed to unsubscribe from the state diff service; error: " + unSubErr.Error())
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}
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return
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}
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case err := <-rpcSub.Err():
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if err != nil {
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log.Error("State diff service rpcSub error: " + err.Error())
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err = api.sds.Unsubscribe(rpcSub.ID)
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if err != nil {
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log.Error("Failed to unsubscribe from the state diff service; error: " + err.Error())
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}
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return
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}
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case <-quitChan:
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// don't need to unsubscribe, service does so before sending the quit signal
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return
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}
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}
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}()
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return rpcSub, nil
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}
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// StateDiffAt returns a statediff payload at the specific blockheight
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func (api *PublicStateDiffAPI) StateDiffAt(ctx context.Context, blockNumber uint64, params Params) (*Payload, error) {
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return api.sds.StateDiffAt(blockNumber, params)
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}
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