121 lines
3.5 KiB
Go
121 lines
3.5 KiB
Go
// VulcanizeDB
|
|
// Copyright © 2019 Vulcanize
|
|
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package serve
|
|
|
|
import (
|
|
"context"
|
|
|
|
"github.com/ethereum/go-ethereum/p2p"
|
|
"github.com/ethereum/go-ethereum/rpc"
|
|
log "github.com/sirupsen/logrus"
|
|
|
|
"github.com/vulcanize/ipld-eth-server/pkg/eth"
|
|
"github.com/vulcanize/ipld-eth-server/pkg/shared"
|
|
v "github.com/vulcanize/ipld-eth-server/version"
|
|
)
|
|
|
|
// APIName is the namespace used for the state diffing service API
|
|
const APIName = "vdb"
|
|
|
|
// APIVersion is the version of the state diffing service API
|
|
const APIVersion = "0.0.1"
|
|
|
|
// PublicServerAPI is the public api for the watcher
|
|
type PublicServerAPI struct {
|
|
w Server
|
|
}
|
|
|
|
// NewPublicServerAPI creates a new PublicServerAPI with the provided underlying Server process
|
|
func NewPublicServerAPI(w Server) *PublicServerAPI {
|
|
return &PublicServerAPI{
|
|
w: w,
|
|
}
|
|
}
|
|
|
|
// Stream is the public method to setup a subscription that fires off IPLD payloads as they are processed
|
|
func (api *PublicServerAPI) Stream(ctx context.Context, params eth.SubscriptionSettings) (*rpc.Subscription, error) {
|
|
// ensure that the RPC connection supports subscriptions
|
|
notifier, supported := rpc.NotifierFromContext(ctx)
|
|
if !supported {
|
|
return nil, rpc.ErrNotificationsUnsupported
|
|
}
|
|
|
|
// create subscription and start waiting for stream events
|
|
rpcSub := notifier.CreateSubscription()
|
|
|
|
go func() {
|
|
// subscribe to events from the SyncPublishScreenAndServe service
|
|
payloadChannel := make(chan SubscriptionPayload, PayloadChanBufferSize)
|
|
quitChan := make(chan bool, 1)
|
|
go api.w.Subscribe(rpcSub.ID, payloadChannel, quitChan, params)
|
|
|
|
// loop and await payloads and relay them to the subscriber using notifier
|
|
for {
|
|
select {
|
|
case packet := <-payloadChannel:
|
|
if err := notifier.Notify(rpcSub.ID, packet); err != nil {
|
|
log.Error("Failed to send watcher data packet", "err", err)
|
|
api.w.Unsubscribe(rpcSub.ID)
|
|
return
|
|
}
|
|
case <-rpcSub.Err():
|
|
api.w.Unsubscribe(rpcSub.ID)
|
|
return
|
|
case <-quitChan:
|
|
// don't need to unsubscribe from the watcher, the service does so before sending the quit signal this way
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
|
|
return rpcSub, nil
|
|
}
|
|
|
|
// Chain returns the chain type that this watcher instance supports
|
|
func (api *PublicServerAPI) Chain() shared.ChainType {
|
|
return api.w.Chain()
|
|
}
|
|
|
|
// Struct for holding watcher meta data
|
|
type InfoAPI struct{}
|
|
|
|
// NewInfoAPI creates a new InfoAPI
|
|
func NewInfoAPI() *InfoAPI {
|
|
return &InfoAPI{}
|
|
}
|
|
|
|
// Modules returns modules supported by this api
|
|
func (iapi *InfoAPI) Modules() map[string]string {
|
|
return map[string]string{
|
|
"vdb": "Stream",
|
|
}
|
|
}
|
|
|
|
// NodeInfo gathers and returns a collection of metadata for the watcher
|
|
func (iapi *InfoAPI) NodeInfo() *p2p.NodeInfo {
|
|
return &p2p.NodeInfo{
|
|
// TODO: formalize this
|
|
ID: "vulcanizeDB",
|
|
Name: "ipld-eth-server",
|
|
}
|
|
}
|
|
|
|
// Version returns the version of the watcher
|
|
func (iapi *InfoAPI) Version() string {
|
|
return v.VersionWithMeta
|
|
}
|