From db9612dd983463d2e8358b5c1e916ce476737857 Mon Sep 17 00:00:00 2001 From: Andrea Maria Piana Date: Wed, 29 Apr 2020 15:51:11 +0200 Subject: [PATCH] initial draft --- docs/stable/9-blockchain-usage.md | 184 ++++++++++++++++++++++++++++++ 1 file changed, 184 insertions(+) create mode 100644 docs/stable/9-blockchain-usage.md diff --git a/docs/stable/9-blockchain-usage.md b/docs/stable/9-blockchain-usage.md new file mode 100644 index 0000000..77d3f5e --- /dev/null +++ b/docs/stable/9-blockchain-usage.md @@ -0,0 +1,184 @@ +--- +permalink: /spec/9 +parent: Stable specs +title: 9/BLOCKCHAIN-USAGE +--- + +# 3/BLOCKCHAIN-USAGE + +> Version: 0.1 +> +> Status: Stable +> +> Authors: Andrea Maria Piana + +# Status interactions with the blockchain + +In this document is document all the interactions that the Status client has +with the blockchain. + +1. [Wallet](#Wallet) +2. [ENS](#ENS) + +## Wallet + +The wallet in Status has two main components: + +1) Sending transactions +2) Fetching balance + +In the section below are described the `RPC` calls made the nodes, with a brief +description of their functionality and how it is used by Status. + +1. [Sending transactions](#Sending-transactions) + *[EstimateGas](#EstimateGas) + *[PendingNonceAt](#PendingNonceAt) + *[SuggestGasPrice](#SuggestGasPrice) + *[SendTransaction](#SendTransaction) +2. [Fetching balance](#Fetching-balance) + *[BlockByHash](#BlockByHash) + *[BlockByNumber](#BlockByNumber) + *[FilterLogs](#FilterLogs) + *[HeaderByNumber](#HeaderByNumber) + *[NonceAt](#NonceAt) + *[TransactionByHash](#TransactionByHash) + *[TransactionReceipt](#TransactionReceipt) + +### Sending transactions + +#### EstimateGase + +EstimateGas tries to estimate the gas needed to execute a specific transaction based on +the current pending state of the backend blockchain. There is no guarantee that this is +the true gas limit requirement as other transactions may be added or removed by miners, +but it should provide a basis for setting a reasonable default. + +``` +func (ec *Client) EstimateGas(ctx context.Context, msg ethereum.CallMsg) (uint64, error) +``` + +https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L499 + + +#### PendingNonceAt +`PendingNonceAt` returns the account nonce of the given account in the pending state. + This is the nonce that should be used for the next transaction. + + ``` +func (ec *Client) PendingNonceAt(ctx context.Context, account common.Address) (uint64, error) +``` + +https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L440 + + +#### SuggestGasPrice + +`SuggestGasPrice` retrieves the currently suggested gas price to allow a timely +execution of a transaction. + +``` +func (ec *Client) SuggestGasPrice(ctx context.Context) (*big.Int, error) +``` + +https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L487 + +#### SendTransaction + +`SendTransaction` injects a signed transaction into the pending pool for execution. + +If the transaction was a contract creation use the TransactionReceipt method to get the +contract address after the transaction has been mined. + + +``` +func (ec *Client) SendTransaction(ctx context.Context, tx *types.Transaction) error +``` + +https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L512 + +### Fetching balance + +#### BlockByHash + +BlockByHash returns the given full block. + +It is used by status to fetch a given block which will then be inspected for +transfers to the user address, both tokens and ETH. + +``` +func (ec *Client) BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error) +``` + +https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L78 + +#### BlockByNumber + +`BlockByNumber` returns a block from the current canonical chain. If number is nil, the +latest known block is returned. + +``` +func (ec *Client) BlockByNumber(ctx context.Context, number *big.Int) (*types.Block, error) +``` + +https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L82 + +#### FilterLogs + +`FilterLogs` executes a filter query. + +Status uses this function to filter out logs, using the hash of the block +and the address that we are interested in, both inbound and outbound. + +``` +func (ec *Client) FilterLogs(ctx context.Context, q ethereum.FilterQuery) ([]types.Log, error) +``` + +https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L377 + + +#### NonceAt + +`NonceAt` returns the account nonce of the given account. + +``` +func (ec *Client) NonceAt(ctx context.Context, account common.Address, blockNumber *big.Int) (uint64, error) +``` + +https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L366 + + +#### TransactionByHash + +`TransactionByHash` returns the transaction with the given hash, used to inspect those +transaction made/received by the user. + +``` +func (ec *Client) TransactionByHash(ctx context.Context, hash common.Hash) (tx *types.Transaction, isPending bool, err error) +``` + +https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L202 + +#### HeaderByNumber + +`HeaderByNumber` returns a block header from the current canonical chain. + +``` +func (ec *Client) HeaderByNumber(ctx context.Context, number *big.Int) (*types.Header, error) +``` + +https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L172 + + +#### TransactionReceipt + +`TransactionReceipt` returns the receipt of a transaction by transaction hash. +It is used in status to check if a token transfer was made to the user address. + +``` +func (ec *Client) TransactionReceipt(ctx context.Context, txHash common.Hash) (*types.Receipt, error) +``` + +https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L270 + + +## ENS