114 lines
5.8 KiB
Plaintext
114 lines
5.8 KiB
Plaintext
_section: JsonRpcProvider @<JsonRpcProvider> @INHERIT<[[Provider]]> @SRC<providers:class.JsonRpcProvider>
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The [JSON-RPC API](link-jsonrpc) is a popular method for interacting
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with Ethereum and is available in all major Ethereum node implementations
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(e.g. [[link-geth]] and [[link-parity]]) as well as many
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third-party web services (e.g. [[link-infura]])
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_property: new ethers.providers.JsonRpcProvider([ urlOrConnectionInfo [ , networkish ] ]) @SRC<providers:constructor.JsonRpcProvider>
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Connect to a JSON-RPC HTTP API using the URL or [[ConnectionInfo]] //urlOrConnectionInfo//
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connected to the //networkish// network.
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If //urlOrConnectionInfo// is not specified, the default (i.e. ``http:/\/localhost:8545``)
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is used and if no network is specified, it will be determined automatically by querying the
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node using ``eth_chaindId`` and falling back on ``eth_networkId``.
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_note: Note: Connecting to a Local Node
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Each node implementation is slightly different and may require specific
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command-line flags, configuration or settings in their UI to enable
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JSON-RPC, unlock accounts or expose specific APIs. Please consult
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their documentation.
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_property: jsonRpcProvider.getSigner([ addressOrIndex ]) => [[JsonRpcSigner]] @<JsonRpcProvider-getSigner> @SRC<providers/json-rpc-provider>
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Returns a [[JsonRpcSigner]] which is managed by this Ethereum node, at
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//addressOrIndex//. If no //addressOrIndex// is provided, the first
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account (account #0) is used.
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_property: jsonRpcProvider.getUncheckedSigner([ addressOrIndex ]) => [[UncheckedJsonRpcSigner]] @<JsonRpcProvider-getUncheckedSigner> @SRC<providers/json-rpc-provider>
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_property: jsonRpcProvider.listAccounts() => Promise<Array<string>> @<JsonRpcProvider-listAccounts> @SRC<providers/json-rpc-provider>
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Returns a list of all account addresses managed by this provider.
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_property: jsonRpcProvider.send(method, params) => Promise<any> @<JsonRpcProvider-send> @SRC<providers/json-rpc-provider>
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Allows sending raw messages to the provider.
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This can be used for backend-specific calls, such as for debugging or
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specific account management.
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_subsection: JsonRpcSigner @<JsonRpcSigner> @INHERIT<[[Signer]]> @SRC<providers:class.JsonRpcSigner>
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A **JsonRpcSigner** is a simple Signer which is backed by a connected
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[[JsonRpcProvider]].
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_property: signer.provider => [[JsonRpcProvider]]
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The provider this signer was established from.
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_property: signer.connectUnchecked() => [[UncheckedJsonRpcSigner]] @<JsonRpcSigner-connectUnchecked> @SRC<providers>
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Returns a new Signer object which does not perform additional checks when
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sending a transaction. See [getUncheckedSigner](JsonRpcProvider-getUncheckedSigner) for more details.
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_property: signer.sendUncheckedTransaction(transaction) => Promise<string<[[DataHexString]]\<32>\>> @<JsonRpcSigner-sendUncheckedTransaction> @SRC<providers>
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Sends the //transaction// and returns a Promise which resolves to the
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opaque transaction hash.
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_property: signer.unlock(password) => Promise<boolean> @<JsonRpcSigner-unlock> @SRC<providers>
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Request the node unlock the account (if locked) using //password//.
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_subsection: JsonRpcUncheckedSigner @<UncheckedJsonRpcSigner> @INHERIT<[[Signer]]> @SRC<providers:class.UncheckedJsonRpcSigner>
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The JSON-RPC API only provides a transaction hash as the response when a
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transaction is sent, but the ethers Provider requires populating all details
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of a transaction before returning it. For example, the gas price and gas limit
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may be adjusted by the node or the nonce automatically included, in which case
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the opaque transaction hash has discarded this.
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To remedy this, the [[JsonRpcSigner]] immediately queries the provider for
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the details using the returned transaction hash to populate the [[providers-TransactionResponse]]
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object.
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Some backends do not respond immediately and instead defer releasing the
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details of a transaction it was responsible for signing until it is mined.
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The **UncheckedSigner** does not populate any additional information and will
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immediately return the result as a mock [[providers-TransactionResponse]]-like
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object, with most of the properties set to null, but allows access to the
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transaction hash quickly, if that is all that is required.
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_subsection: StaticJsonRpcProvider @<StaticJsonRpcProvider> @INHERIT<[[JsonRpcProvider]]> @SRC<providers:class.StaticJsonRpcProvider>
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An ethers Provider will execute frequent ``getNetwork`` calls to ensure
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the network calls and network being communicated with are consistent.
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In the case of a client like MetaMask, this is desired as the network
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may be changed by the user at any time, in such cases the cost of
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checking the chainId is local and therefore cheap.
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However, there are also many times where it is known the network cannot
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change, such as when connecting to an INFURA endpoint, in which case,
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the **StaticJsonRpcProvider** can be used which will indefinitely cache
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the chain ID, which can reduce network traffic and reduce round-trip
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queries for the chain ID.
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This [[Provider]] should **only** be used when it is known the network
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cannot change.
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_subsection: Node-Specific Methods @<JsonRpcProvider--other>
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Many methods are less common or specific to certain Ethereum Node implementations
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(e.g. [Parity](link-parity) vs [Geth](link-geth). These include account and admin management,
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debugging, deeper block and transaction exploration and other services (such as
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Swarm and Whisper).
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The [jsonRpcProvider.send](JsonRpcProvider-send) method can be used to access these.
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- [All JSON-RPC methods](link-json-rpc) (including the less common methods) which most
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Ethereum Nodes support.
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- [Parity's Trace Module](link-parity-trace) can be used to trace and debug EVM
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execution of a transaction (requires custom configuration)
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- [Geth's Debug Module](link-geth-debug) can be used to debug transactions and
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internal cache state, etc.
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- [Additional Geth Methods](link-geth-rpc)
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- [Additional Parity Methods](link-parity-rpc)
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