346 lines
17 KiB
Markdown
346 lines
17 KiB
Markdown
-----
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Documentation: [html](https://docs.ethers.io/)
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-----
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Provider
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========
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Accounts Methods
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----------------
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#### *provider* . **getBalance**( address [ , blockTag = latest ] ) => *Promise< [BigNumber](/v5/api/utils/bignumber/) >*
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Returns the balance of *address* as of the *blockTag* block height.
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#### *provider* . **getCode**( address [ , blockTag = latest ] ) => *Promise< string< [DataHexString](/v5/api/utils/bytes/#DataHexString) > >*
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Returns the contract code of *address* as of the *blockTag* block height. If there is no contract currently deployed, the result is `0x`.
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#### *provider* . **getStorageAt**( addr , pos [ , blockTag = latest ] ) => *Promise< string< [DataHexString](/v5/api/utils/bytes/#DataHexString) > >*
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Returns the `Bytes32` value of the position *pos* at address *addr*, as of the *blockTag*.
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#### *provider* . **getTransactionCount**( address [ , blockTag = latest ] ) => *Promise< number >*
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Returns the number of transactions *address* has ever **sent**, as of *blockTag*. This value is required to be the nonce for the next transaction from *address* sent to the network.
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```javascript
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// Get the balance for an account...
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provider.getBalance("ricmoo.firefly.eth");
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// { Promise: { BigNumber: "284831012276355695" } }
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// Get the code for a contract...
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provider.getCode("registrar.firefly.eth");
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// { Promise: '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' }
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// Get the storage value at position 0...
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provider.getStorageAt("registrar.firefly.eth", 0)
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// { Promise: '0x000000000000000000000000314159265dd8dbb310642f98f50c066173c1259b' }
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// Get transaction count of an account...
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provider.getTransactionCount("ricmoo.firefly.eth");
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// { Promise: 689 }
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```
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Blocks Methods
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--------------
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#### *provider* . **getBlock**( block ) => *Promise< [Block](/v5/api/providers/types/#providers-Block) >*
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Get the *block* from the network, where the `result.transactions` is a list of transaction hashes.
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#### *provider* . **getBlockWithTransactions**( block ) => *Promise< [BlockWithTransactions](/v5/api/providers/types/#providers-BlockWithTransactions) >*
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Get the *block* from the network, where the `result.transactions` is an Array of [TransactionResponse](/v5/api/providers/types/#providers-TransactionResponse) objects.
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```javascript
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provider.getBlock(100004)
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// { Promise: {
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// difficulty: 3849295379889,
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// extraData: '0x476574682f76312e302e312d39383130306634372f6c696e75782f676f312e34',
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// gasLimit: { BigNumber: "3141592" },
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// gasUsed: { BigNumber: "21000" },
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// hash: '0xf93283571ae16dcecbe1816adc126954a739350cd1523a1559eabeae155fbb63',
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// miner: '0x909755D480A27911cB7EeeB5edB918fae50883c0',
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// nonce: '0x1a455280001cc3f8',
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// number: 100004,
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// parentHash: '0x73d88d376f6b4d232d70dc950d9515fad3b5aa241937e362fdbfd74d1c901781',
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// timestamp: 1439799168,
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// transactions: [
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// '0x6f12399cc2cb42bed5b267899b08a847552e8c42a64f5eb128c1bcbd1974fb0c'
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// ]
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// } }
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provider.getBlockWithTransactions(100004)
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// { Promise: {
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// difficulty: 3849295379889,
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// extraData: '0x476574682f76312e302e312d39383130306634372f6c696e75782f676f312e34',
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// gasLimit: { BigNumber: "3141592" },
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// gasUsed: { BigNumber: "21000" },
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// hash: '0xf93283571ae16dcecbe1816adc126954a739350cd1523a1559eabeae155fbb63',
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// miner: '0x909755D480A27911cB7EeeB5edB918fae50883c0',
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// nonce: '0x1a455280001cc3f8',
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// number: 100004,
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// parentHash: '0x73d88d376f6b4d232d70dc950d9515fad3b5aa241937e362fdbfd74d1c901781',
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// timestamp: 1439799168,
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// transactions: [
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// {
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// blockHash: '0xf93283571ae16dcecbe1816adc126954a739350cd1523a1559eabeae155fbb63',
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// blockNumber: 100004,
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// chainId: 0,
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// confirmations: 11212224,
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// creates: null,
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// data: '0x',
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// from: '0xcf00A85f3826941e7A25BFcF9Aac575d40410852',
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// gasLimit: { BigNumber: "90000" },
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// gasPrice: { BigNumber: "54588778004" },
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// hash: '0x6f12399cc2cb42bed5b267899b08a847552e8c42a64f5eb128c1bcbd1974fb0c',
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// nonce: 25,
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// r: '0xb23adc880d3735e4389698dddc953fb02f1fa9b57e84d3510a2a4b3597ac2486',
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// s: '0x4e856f95c4e2828933246fb4765a5bfd2ca5959840643bef0e80b4e3a243d064',
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// to: '0xD9666150A9dA92d9108198a4072970805a8B3428',
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// transactionIndex: 0,
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// v: 27,
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// value: { BigNumber: "5000000000000000000" }
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// }
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// ]
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// } }
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```
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Ethereum Naming Service (ENS) Methods
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-------------------------------------
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#### *provider* . **lookupAddress**( address ) => *Promise< string >*
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Performs a reverse lookup of the *address* in ENS using the *Reverse Registrar*. If the name does not exist, or the forward lookup does not match, `null` is returned.
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#### *provider* . **resolveName**( name ) => *Promise< string< [Address](/v5/api/utils/address/#address) > >*
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Looks up the address of *name*. If the name is not owned, or does not have a *Resolver* configured, or the *Resolver* does not have an address configured, `null` is returned.
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```javascript
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// Reverse lookup of an ENS by address...
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provider.lookupAddress("0x6fC21092DA55B392b045eD78F4732bff3C580e2c");
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// { Promise: 'registrar.firefly.eth' }
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// Lookup an address of an ENS name...
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provider.resolveName("ricmoo.firefly.eth");
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// { Promise: '0x8ba1f109551bD432803012645Ac136ddd64DBA72' }
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```
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Logs Methods
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------------
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#### *provider* . **getLogs**( filter ) => *Promise< Array< [Log](/v5/api/providers/types/#providers-Log) > >*
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Returns the Array of [Log](/v5/api/providers/types/#providers-Log) matching the *filter*.
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Keep in mind that many backends will discard old events, and that requests which are too broad may get dropped as they require too many resources to execute the query.
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Network Status Methods
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----------------------
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#### *provider* . **getNetwork**( ) => *Promise< [Network](/v5/api/providers/types/#providers-Network) >*
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Returns the [Network](/v5/api/providers/types/#providers-Network) this Provider is connected to.
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#### *provider* . **getBlockNumber**( ) => *Promise< number >*
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Returns the block number (or height) of the most recently mined block.
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#### *provider* . **getGasPrice**( ) => *Promise< [BigNumber](/v5/api/utils/bignumber/) >*
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Returns a *best guess* of the [Gas Price](/v5/concepts/gas/#gas-price) to use in a transaction.
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```javascript
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// The network information
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provider.getNetwork()
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// {
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// chainId: 1,
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// ensAddress: '0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e',
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// name: 'homestead'
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// }
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// The current block number
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provider.getBlockNumber()
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// { Promise: 11312227 }
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// Get the current suggested gas price (in wei)...
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gasPrice = await provider.getGasPrice()
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// { BigNumber: "46200000000" }
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// ...often this gas price is easier to understand or
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// display to the user in gwei (giga-wei, or 1e9 wei)
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utils.formatUnits(gasPrice, "gwei")
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// '46.2'
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```
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Transactions Methods
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--------------------
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#### *provider* . **call**( transaction [ , blockTag = latest ] ) => *Promise< string< [DataHexString](/v5/api/utils/bytes/#DataHexString) > >*
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Returns the result of executing the *transaction*, using *call*. A call does not require any ether, but cannot change any state. This is useful for calling getters on Contracts.
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#### *provider* . **estimateGas**( transaction ) => *Promise< [BigNumber](/v5/api/utils/bignumber/) >*
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Returns an estimate of the amount of gas that would be required to submit *transaction* to the network.
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An estimate may not be accurate since there could be another transaction on the network that was not accounted for, but after being mined affected relevant state.
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#### *provider* . **sendTransaction**( transaction ) => *Promise< [TransactionResponse](/v5/api/providers/types/#providers-TransactionResponse) >*
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Submits *transaction* to the network to be mined. The *transaction* **must** be signed, and be valid (i.e. the nonce is correct and the account has sufficient balance to pay for the transaction).
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#### *provider* . **waitForTransaction**( hash [ , confirms = 1 [ , timeout ] ] ) => *Promise< [TxReceipt](/v5/api/providers/types/#providers-TransactionReceipt) >*
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Returns a Promise which will not resolve until *transactionHash* is mined.
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Event Emitter Methods
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---------------------
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#### *provider* . **on**( eventName , listener ) => *this*
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Add a *listener* to be triggered for each *eventName*.
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#### *provider* . **once**( eventName , listener ) => *this*
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Add a *listener* to be triggered for only the next *eventName*, at which time it will be removed.
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#### *provider* . **emit**( eventName , ...args ) => *boolean*
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Notify all listeners of *eventName*, passing *args* to each listener. This is generally only used internally.
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#### *provider* . **off**( eventName [ , listener ] ) => *this*
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Remove a *listener* for *eventName*. If no *listener* is provided, all listeners for *eventName* are removed.
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#### *provider* . **removeAllListeners**( [ eventName ] ) => *this*
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Remove all the listeners for *eventName*. If no *eventName* is provided, **all** events are removed.
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#### *provider* . **listenerCount**( [ eventName ] ) => *number*
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Returns the number of listeners for *eventName*. If no *eventName* is provided, the total number of listeners is returned.
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#### *provider* . **listeners**( eventName ) => *Array< Listener >*
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Returns the list of Listeners for *eventName*.
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### Events
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#### **Log Filter**
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A filter is an object, representing a contract log Filter, which has the optional properties `address` (the source contract) and `topics` (a topic-set to match).
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If `address` is unspecified, the filter matches any contract address.
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See events for more information on how to specify topic-sets.
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#### **Topic-Set Filter**
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The value of a **Topic-Set Filter** is a array of Topic-Sets.
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This event is identical to a *Log Filter* with the address omitted (i.e. from any contract).
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#### **Transaction Filter**
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The value of a **Transaction Filter** is any transaction hash.
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This event is emitted on every block that is part of a chain that includes the given mined transaction. It is much more common that the [once](/v5/api/providers/provider/#Provider-once) method is used than the [on](/v5/api/providers/provider/#Provider-on) method.
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In addition to transaction and filter events, there are several named events.
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Named Provider Events
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```javascript
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provider.on("block", (blockNumber) => {
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// Emitted on every block change
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})
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provider.once(txHash, (transaction) => {
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// Emitted when the transaction has been mined
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})
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// This filter could also be generated with the Contract or
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// Interface API. If address is not specified, any address
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// matches and if topics is not specified, any log matches
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filter = {
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address: "dai.tokens.ethers.eth",
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topics: [
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utils.id("Transfer(address,address,uint256)")
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]
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}
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provider.on(filter, (log, event) => {
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// Emitted whenever a DAI token transfer occurs
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})
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// Notice this is an array of topic-sets and is identical to
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// using a filter with no address (i.e. match any address)
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topicSets = [
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utils.id("Transfer(address,address,uint256)"),
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null,
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[
|
|
myAddress,
|
|
myOtherAddress
|
|
]
|
|
]
|
|
provider.on(topicSets, (log, event) => {
|
|
// Emitted any token is sent TO either address
|
|
})
|
|
|
|
|
|
provider.on("pending", (tx) => {
|
|
// Emitted when any new pending transaction is noticed
|
|
});
|
|
|
|
|
|
provider.on("error", (tx) => {
|
|
// Emitted when any error occurs
|
|
});
|
|
```
|
|
|
|
Inspection Methods
|
|
------------------
|
|
|
|
#### *Provider* . **isProvider**( object ) => *boolean*
|
|
|
|
Returns true if and only if *object* is a Provider.
|
|
|
|
|