web3-jsonrpc-gateway

A Web3 JSON-RPC provider gateway that handles accounts on its own using Ethers.js, or other SDKs, but delegates chain queries to a 3rd party "destination provider", e.g. Infura, Cloudflare, Conflux, BOBA-L2, etc.

Compilation

yarn build

Running a single server instance, depending on destination provider type:

Infura as destination provider:

node dist/bin/ethers/infura

Required environment variables:

• W3GW_PORT: listening port for the server. Can also be passed from command-line as first parameter.
• W3GW_NETWORK: network name. Infura supports: mainnet, ropsten, rinkeby, kovan and goerli.
• W3GW_SEED_PHRASE: the seed phrase to use for the server's own wrapped wallet, in BIP-39 mnemonics format.
• W3GW_PROVIDER_KEY: your Infura project ID.

Optional environment variables:

• EVM_CALL_INTERLEAVE_BLOCKS: number of blocks before latest knwon upon which EVM read-only calls will be bound to; this variable defaults to zero.
• INFURA_GAS_LIMIT: default gas limit, if not specified by the client; or maximum gas limit threshold if either estimated by the provider, or provided by the client.
• INFURA_GAS_PRICE: default gas price, if not specified by the client; or maximum gas price threshold if either estimated by the provider, or provided by the client.
• INFURA_GAS_PRICE_FACTOR: multiplier applied to gas prices estimated by provider.
• W3GW_LOG_LEVEL: max log level to be traced, can be any of the following: error, warn, info, http, verbose, debug, silly. If not specified, verbose will apply.
• W3GW_SEED_PHRASE_WALLETS: number of wallet addresses to be handled by the gateway, derived from path 'm/44'/60'/0'/0/*'.

Celo-compatible destination providers:

node dist/bin/celo

Required environment variables:

• W3GW_PORT: listening port for the server. Can also be passed from command-line as first parameter.
• W3GW_NETWORK: Celo providers currently supports: 44787 for testnet, and 42220 for mainnet.
• W3GW_PROVIDER_URL: actual URL of the Web3 JSON-RPC provider.
• W3GW_PRIVATE_KEYS: array of private keys to be used for signing transactions.

Optional environment variables:

• CELO_FEE_CURRENCY: ERC-20 token address to be used for paying transaction gas. Native CELO will be used if none specified.
• CELO_GAS_LIMIT_FACTOR: factor by which the provider-estimated gas limit will be multiplied, before signing transactions.
• CELO_GAS_PRICE_FACTOR: factor by which the provider-estimated gas price minimum will be multiplied, before signing transactions.
• CELO_GAS_PRICE_MAX: maximum gas price the gateway is allowed to bid when signing transactions.
• EVM_CALL_INTERLEAVE_BLOCKS: number of blocks before latest knwon upon which EVM read-only calls will be bound to; this variable defaults to zero.

Conflux-compatible destination providers:

node ./dist/bin/conflux

Required environment variables:

• W3GW_PROVIDER_URL: actual URL of the Web3 JSON-RPC provider. Can also be passed from command-line as a first parameter.
• W3GW_PORT: listening port for the server. Can also be passed from command-line as a second parameter.
• W3GW_NETWORK: network id. Conflux providers currently supports: 1 for testnet, and 1029 for mainnet.
• W3GW_PRIVATE_KEYS: array of private keys to be used for signing transactions.

Optional environment variables:

• CONFLUX_DEFAULT_EPOCH_LABEL: default epoch label to be used on read-only RPC calls, if none is specified by the caller; this variable will default to "latest_finalized" if none is set.
• CONFLUX_ESTIMATE_GAS_PRICE: if set to true, the provider will be asked to estimate the gas price, before signing the transaction; if the provider-estimated gas price is greater than CONFLUX_GAS_PRICE, the transaction will be rejected by the gateway.
• CONFLUX_GAS_LIMIT: default gas limit to be used before signing a transaction, if not specified by the caller.
• CONFLUX_GAS_PRICE: default gas price to be used before signing a transaction, if not specified by the caller.
• EVM_CALL_INTERLEAVE_BLOCKS: number of epochs before current epoch number upon which EVM read-only calls will be bound to; this variable defaults to zero.
• W3GW_LOG_LEVEL: max log level to be traced, can be any of the following: error, warn, info, http, verbose, debug, silly. If not specified, verbose will apply.

Reef-compatible destination providers:

node ./dist/bin/reef

Required environment variables:

• W3GW_PROVIDER_URL: actual URL of the Web3 JSON-RPC provider. Can also be passed from command-line as a first parameter.
• REEF_GRAPHQL_URL: the GraphQL endpoint serving EVM's data. Can also be passed from command-line as a second parameter.
• W3GW_PORT: listening port for the server. Can also be passed from command-line as a third parameter.
• W3GW_SEED_PHRASE: seed phrase to be used with either Infura or Ethers.js providers.

Optional environment variables:

• W3GW_LOG_LEVEL: max log level to be traced, can be any of the following: error, warn, info, http, verbose, debug, silly. If not specified, verbose will apply.
• W3GW_SEED_PHRASE_WALLETS: number of EVM wallet addresses to be handled by the gateway. EVM addresses will be default ones attached to respective Reef addresses. First Reef address will be derived from '${W3GW_SEED_PHRASE}', while the following one from '${W3GW_SEED_PHRASE}//${j}' (with j > 0).

Generic destination providers:

node ./dist/bin/ethers

Generic destination providers need to comply with the JsonRpcProvider type from the Ethers.js library:

• jsonrpcprovider
• Ethers.js

Required environment variables:

• W3GW_PORT: listening port for the server. Can also be passed from command-line as a second parameter.
• W3GW_SEED_PHRASE: the seed phrase to use for the server's own wrapped wallet, in BIP-39 mnemonics format.
• W3GW_PROVIDER_URL: actual URL of the Web3 JSON-RPC provider. Can also be passed from command-line as a first parameter.

Optional environment variables:

• W3GW_NETWORK: the network name to connect with.
• W3GW_SEED_PHRASE_WALLETS: number of wallet addresses to be handled by the gateway, derived from path 'm/44'/60'/0'/0/*'.
• W3GW_LOG_LEVEL: max log level to be traced, can be any of the following: error, warn, info, http, verbose, debug, silly. If not specified, verbose will apply.
• ETHERS_ALWAYS_SYNCED: if set to true, the gateway will intercept calls to eth_syncing as to return false in all cases..
• ETHERS_ESTIMATE_GAS_LIMIT: if set to true, the provider will be asked to estimate the gas limit, before signing the transaction; if the provider-estimated gas limit is greater than ETHERS_GAS_LIMIT, the transaction will be rejected by the gateway.
• ETHERS_ESTIMATE_GAS_PRICE: if set to true, the provider will be asked to estimate the gas price, before signing the transaction; if the provider-estimated gas price is greater than ETHERS_GAS_PRICE, the transaction will be rejected by the gateway.
• ETHERS_GAS_LIMIT: default gas limit, if not specified by the client; or maximum gas limit threshold if either estimated by the provider, or provided by the client.
• ETHERS_GAS_PRICE: default gas price, if not specified by the client; or maximum gas price threshold if either estimated by the provider, or provided by the client.
• ETHERS_GAS_PRICE_FACTOR: multiplier applied to estimated gas price, if ETHERS_ESTIMATE_GAS_PRICE is true.
• ETHERS_MOCK_FILTERS: makes eth_getFilterChanges to always return latest known block.
• EVM_CALL_INTERLEAVE_BLOCKS: number of blocks before latest knwon upon which EVM read-only calls will be bound to; this variable defaults to zero.

Pre-configured JSON-RPC provider gateways:

There are several package scripts at your disposal for you to launch specific gateways to multiple WEB3-compatible blockchains, and different possible networks within them.

Important: In order to these batch scripts to work properly, please rename .env_batch_example to .env, and fulfill the following parameters:

• EVM_CALL_INTERLEAVE_BLOCKS: number of blocks before latest knwon upon which EVM read-only calls will be bound to; this variable defaults to zero.
• W3GW_PROVIDER_KEY: your Infura's project id to be used with Infura-connected servers.
• W3GW_LOG_LEVEL: max log level to be traced, can be any of the following: error, warn, info, http, verbose, debug, silly. If not specified, verbose will apply.
• W3GW_PRIVATE_KEYS: array of private keys to be used by Conflux and Celo -alike providers.
• W3GW_SEED_PHRASE: seed phrase to be used with either Infura or Ethers.js providers.

Running gateways to Ethereum networks:

• Rinkeby: npm run ethereum:rinkeby
• Goerli: npm run ethereum:goerli
• Kovan: npm run ethereum:kovan
• Ropsten: npm run ethereum:ropsten
• Mainnet: npm run ethereum:mainnet

Running gateways to BOBA Layer-2 networks:

• Rinkeby: npm run boba:rinkeby
• Mainnet: npm run boba:mainnet

Running gateways to CELO networks:

• Alfajores: npm run celo:alfajores
• Mainnet: npm run celo:mainnet

Running gateways to Conflux networks:

• Testnet: npm run conflux:testnet
• Mainnet: npm run conflux:mainnet

Running gateways to HARMONY networks:

• Testnet (Shard #0): npm run harmony:testnet#0

Running gateways to KCC networks:

• Testnet: npm run kcc:testnet

Running gateways to METIS networks:

• Stardust (Rinkeby): npm run metis:rinkeby

Running gateways to POLYGON networks:

• Mumbai (Goerli): npm run polygon:goerli

Running gateways to REEF CHAIN networks:

• Testnet: npm run reef:testnet

How to create a server for any other provider

To integrate with a different provider, you can create your own script that creates the provider and then build a server around it. Please, have a look to provided examples in src/bin/**.