104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
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package chains
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import (
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"context"
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"errors"
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"fmt"
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"math"
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"time"
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"github.com/wormhole-foundation/wormhole-explorer/txtracker/config"
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"github.com/wormhole-foundation/wormhole/sdk/vaa"
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)
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const requestTimeout = 30 * time.Second
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var (
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ErrChainNotSupported = errors.New("chain id not supported")
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ErrTransactionNotFound = errors.New("transaction not found")
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)
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type TxDetail struct {
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// Signer is the address that signed the transaction, encoded in the chain's native format.
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Signer string
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// Timestamp indicates the time at which the transaction was confirmed.
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Timestamp time.Time
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// NativeTxHash contains the transaction hash, encoded in the chain's native format.
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NativeTxHash string
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}
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var tickers = struct {
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ankr *time.Ticker
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solana *time.Ticker
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terra *time.Ticker
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}{}
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func Initialize(cfg *config.Settings) {
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// f converts "requests per minute" into the associated time.Duration
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f := func(requestsPerMinute uint16) time.Duration {
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division := float64(time.Minute) / float64(time.Duration(requestsPerMinute))
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roundedUp := math.Ceil(division)
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return time.Duration(roundedUp)
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}
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tickers.ankr = time.NewTicker(f(cfg.AnkrRequestsPerMinute))
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tickers.terra = time.NewTicker(f(cfg.TerraRequestsPerMinute))
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// the Solana adapter sends 2 requests per txHash
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tickers.solana = time.NewTicker(f(cfg.SolanaRequestsPerMinute / 2))
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}
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func FetchTx(
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ctx context.Context,
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cfg *config.Settings,
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chainId vaa.ChainID,
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txHash string,
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) (*TxDetail, error) {
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var fetchFunc func(context.Context, *config.Settings, string) (*TxDetail, error)
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var rateLimiter time.Ticker
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// decide which RPC/API service to use based on chain ID
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switch chainId {
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case vaa.ChainIDSolana:
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fetchFunc = fetchSolanaTx
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rateLimiter = *tickers.solana
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case vaa.ChainIDTerra:
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fetchFunc = fetchTerraTx
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rateLimiter = *tickers.terra
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// most EVM-compatible chains use the same RPC service
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case vaa.ChainIDEthereum,
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vaa.ChainIDBSC,
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vaa.ChainIDPolygon,
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vaa.ChainIDAvalanche,
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vaa.ChainIDFantom,
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vaa.ChainIDArbitrum,
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vaa.ChainIDOptimism:
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fetchFunc = ankrFetchTx
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rateLimiter = *tickers.ankr
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default:
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return nil, ErrChainNotSupported
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}
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// wait for rate limit - fail fast if context was cancelled
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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case <-rateLimiter.C:
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}
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// get transaction details from the RPC/API service
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subContext, cancelFunc := context.WithTimeout(ctx, requestTimeout)
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defer cancelFunc()
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txDetail, err := fetchFunc(subContext, cfg, txHash)
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if err != nil {
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return nil, fmt.Errorf("failed to retrieve tx information: %w", err)
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}
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return txDetail, nil
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}
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