forked from cerc-io/ipld-eth-server
61 lines
1.7 KiB
Go
61 lines
1.7 KiB
Go
// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero 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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// This program 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 Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package watcher
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import (
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"errors"
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"github.com/ethereum/go-ethereum/rpc"
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)
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type Flag int32
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const (
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EmptyFlag Flag = iota
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BackFillCompleteFlag
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)
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// Subscription holds the information for an individual client subscription to the super node
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type Subscription struct {
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ID rpc.ID
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PayloadChan chan<- SubscriptionPayload
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QuitChan chan<- bool
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}
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// SubscriptionPayload is the struct for a super node stream payload
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// It carries data of a type specific to the chain being supported/queried and an error message
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type SubscriptionPayload struct {
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Data []byte `json:"data"` // e.g. for Ethereum rlp serialized eth.StreamPayload
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Height int64 `json:"height"`
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Err string `json:"err"` // field for error
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Flag Flag `json:"flag"` // field for message
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}
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func (sp SubscriptionPayload) Error() error {
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if sp.Err == "" {
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return nil
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}
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return errors.New(sp.Err)
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}
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func (sp SubscriptionPayload) BackFillComplete() bool {
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if sp.Flag == BackFillCompleteFlag {
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return true
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}
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return false
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}
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