forked from ek0mssavi0r/noPROXY_c2s
61 lines
2.0 KiB
Go
61 lines
2.0 KiB
Go
// Package contract handles smart contract interaction for the fully
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// decentralized CID feed mode (MODE B).
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//
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// This file only contains the interface. The actual implementation requires
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// go-ethereum and is in contract_eth.go (build tag: ethereum).
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package contract
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import "errors"
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// CIDEvent represents a NewCID event emitted by the smart contract.
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type CIDEvent struct {
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CID string
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Sender string
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Timestamp uint64
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BlockNum uint64
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TxHash string
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}
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// Watcher watches a smart contract for NewCID events.
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type Watcher interface {
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// Watch starts watching for new CID events. The callback is called
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// for each event. Returns a channel that receives an error on failure.
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Watch(callback func(CIDEvent)) (<-chan error, error)
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// GetLatestCID fetches the current CID from the contract.
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GetLatestCID() (string, error)
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// SendCID submits a new CID to the contract (requires wallet).
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SendCID(cid string, privateKeyHex string) (string, error)
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// Close cleans up the watcher.
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Close()
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}
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// ErrNotCompiledWithEthereum is returned when the binary is not built with
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// the ethereum build tag.
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var ErrNotCompiledWithEthereum = errors.New("not compiled with -tags ethereum; rebuild with: go build -tags ethereum")
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// PlaceholderWatcher returns errors requiring go-ethereum.
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type PlaceholderWatcher struct{}
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func (p *PlaceholderWatcher) Watch(callback func(CIDEvent)) (<-chan error, error) {
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return nil, ErrNotCompiledWithEthereum
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}
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func (p *PlaceholderWatcher) GetLatestCID() (string, error) {
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return "", ErrNotCompiledWithEthereum
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}
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func (p *PlaceholderWatcher) SendCID(cid, privateKeyHex string) (string, error) {
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return "", ErrNotCompiledWithEthereum
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}
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func (p *PlaceholderWatcher) Close() {}
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// NewWatcher creates a contract watcher. If go-ethereum is not available,
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// returns a placeholder that errors.
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var NewWatcher func(rpcURL, contractAddr string) (Watcher, error) = func(rpcURL, contractAddr string) (Watcher, error) {
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return &PlaceholderWatcher{}, ErrNotCompiledWithEthereum
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}
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