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muerwre 63ad1573e1 commit 623fa7b7fd 
Author: Fedor Katurov <gotham48@gmail.com>
Date:   Thu Nov 10 16:21:06 2022 +0600

    made contacts page
2022-11-10 10:23:07 +00:00

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{"_path":"/blockchain/smart-contracts","_dir":"blockchain","_draft":false,"_partial":false,"_locale":"en","_empty":false,"title":"Smart Contracts","description":"For common functions see Common typescript examples.","excerpt":{"type":"root","children":[{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"For common functions see "},{"type":"element","tag":"a","props":{"href":"Common%20typescript%20examples"},"children":[{"type":"text","value":"Common typescript examples"}]},{"type":"text","value":"."}]},{"type":"element","tag":"h2","props":{"id":"getting-smart-contract-instance"},"children":[{"type":"text","value":"Getting smart contract instance"}]},{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Useful for calling smart contract methods:"}]},{"type":"element","tag":"code","props":{"code":"import { Contract } from 'web3-eth-contract';\nimport { web3 } from '.';\n\nconst getContract = (abi: object, address?: string): Contract => {\n const abiFromJson = JSON.parse(JSON.stringify(abi));\n return new web3.eth.Contract(abiFromJson, address);\n};\n\nexport default getContract;\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":"import { Contract } from 'web3-eth-contract';\nimport { web3 } from '.';\n\nconst getContract = (abi: object, address?: string): Contract => {\n const abiFromJson = JSON.parse(JSON.stringify(abi));\n return new web3.eth.Contract(abiFromJson, address);\n};\n\nexport default getContract;\n"}]}]}]},{"type":"element","tag":"h2","props":{"id":"executing-contract-method"},"children":[{"type":"text","value":"Executing contract method"}]},{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Contract has "},{"type":"element","tag":"strong","props":{},"children":[{"type":"text","value":"read"}]},{"type":"text","value":" and "},{"type":"element","tag":"strong","props":{},"children":[{"type":"text","value":"write"}]},{"type":"text","value":" methods. To get a list of methods, you can paste contract address on "},{"type":"element","tag":"a","props":{"href":"https://etherscan.io/token/0xdac17f958d2ee523a2206206994597c13d831ec7#readContract","rel":["nofollow"]},"children":[{"type":"text","value":"https://etherscan.io/ ETH"}]},{"type":"text","value":" or any other service."}]},{"type":"element","tag":"p","props":{},"children":[{"type":"element","tag":"strong","props":{},"children":[{"type":"text","value":"Read"}]},{"type":"text","value":" methods doesn't require spending "},{"type":"element","tag":"strong","props":{},"children":[{"type":"text","value":"gas"}]},{"type":"text","value":". "},{"type":"element","tag":"strong","props":{},"children":[{"type":"text","value":"Write"}]},{"type":"text","value":" methods cost some amount of "},{"type":"element","tag":"strong","props":{},"children":[{"type":"text","value":"gas"}]},{"type":"text","value":", hence they will be executed with confirmation from user."}]},{"type":"element","tag":"h3","props":{"id":"example-for-metamask-without-private-key"},"children":[{"type":"text","value":"Example for #Metamask without private key"}]},{"type":"element","tag":"code","props":{"code":"// see example below\nimport { getContract } from '.';\n\n// ABI of contract\nconst CONTRACT_ABI = { /* ... */ };\n // address for contract\nconst CONTRACT_ADDRESS = '0xdea164f67df4dbfe675d5271c9d404e0260f33bb';\n\nexport const executeContractMethod = async ({}) => {\n // getting contract\n const contract = getContract(CONTRACT_ABI, CONTRACT_ADDRESS);\n \n // Calling write method\n try {\n // authorizing with Metamask\n await web3.currentProvider.request({ method: 'eth_requestAccounts' });\n // getting wallet address\n const addressUser = web3.currentProvider.selectedAddress;\n // calling \"store\" store method for contract\n // payload should include `from` address, that matches\n // current user's wallet\n await contract.methods.store(0, 'Parameter').send({\n from: addressUser,\n });\n } catch (e) {\n throw new Error(e);\n }\n \n // calling read method\n try {\n // this method can return data\n const result = await contract.methods.retrieve().call();\n } catch (e) {\n throw new Error(e);\n }\n}\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":"// see example below\nimport { getContract } from '.';\n\n// ABI of contract\nconst CONTRACT_ABI = { /* ... */ };\n // address for contract\nconst CONTRACT_ADDRESS = '0xdea164f67df4dbfe675d5271c9d404e0260f33bb';\n\nexport const executeContractMethod = async ({}) => {\n // getting contract\n const contract = getContract(CONTRACT_ABI, CONTRACT_ADDRESS);\n \n // Calling write method\n try {\n // authorizing with Metamask\n await web3.currentProvider.request({ method: 'eth_requestAccounts' });\n // getting wallet address\n const addressUser = web3.currentProvider.selectedAddress;\n // calling \"store\" store method for contract\n // payload should include `from` address, that matches\n // current user's wallet\n await contract.methods.store(0, 'Parameter').send({\n from: addressUser,\n });\n } catch (e) {\n throw new Error(e);\n }\n \n // calling read method\n try {\n // this method can return data\n const result = await contract.methods.retrieve().call();\n } catch (e) {\n throw new Error(e);\n }\n}\n"}]}]}]},{"type":"element","tag":"h3","props":{"id":"nodejs-and-react-native-example"},"children":[{"type":"text","value":"Node.js and React Native example"}]},{"type":"element","tag":"code","props":{"code":"// see example below\nimport { getContract } from '.';\n\n// ABI контракта\nconst CONTRACT_ABI = { /* ... */ };\n// contract address\nconst CONTRACT_ADDRESS = '0xdea164f67df4dbfe675d5271c9d404e0260f33bb';\n// getting contract\nconst contract = getContract(CONTRACT_ABI, CONTRACT_ADDRESS);\n// account's private key\nconst privateKey = '...';\n\n// write-methods requires private key\nconst executeContractMethod = async (val: number) => {\n const transaction = contract.methods.store(val);\n const account = web3.eth.accounts.privateKeyToAccount(privateKey);\n const options = {\n to: CONTRACT_ADDRESS,\n data: transaction.encodeABI(),\n gas: await transaction.estimateGas({ from: account.address }),\n gasPrice: await web3.eth.getGasPrice(),\n };\n const signed = await web3.eth.accounts.signTransaction(\n options,\n privateKey,\n );\n await web3.eth.sendSignedTransaction(signed.rawTransaction!);\n};\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":"// see example below\nimport { getContract } from '.';\n\n// ABI контракта\nconst CONTRACT_ABI = { /* ... */ };\n// contract address\nconst CONTRACT_ADDRESS = '0xdea164f67df4dbfe675d5271c9d404e0260f33bb';\n// getting contract\nconst contract = getContract(CONTRACT_ABI, CONTRACT_ADDRESS);\n// account's private key\nconst privateKey = '...';\n\n// write-methods requires private key\nconst executeContractMethod = async (val: number) => {\n const transaction = contract.methods.store(val);\n const account = web3.eth.accounts.privateKeyToAccount(privateKey);\n const options = {\n to: CONTRACT_ADDRESS,\n data: transaction.encodeABI(),\n gas: await transaction.estimateGas({ from: account.address }),\n gasPrice: await web3.eth.getGasPrice(),\n };\n const signed = await web3.eth.accounts.signTransaction(\n options,\n privateKey,\n );\n await web3.eth.sendSignedTransaction(signed.rawTransaction!);\n};\n"}]}]}]},{"type":"element","tag":"h3","props":{"id":"calling-a-batch-of-contracts-methods"},"children":[{"type":"text","value":"Calling a batch of contract's methods"}]},{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Function calls batch of requests, returning array of results. For example:"}]},{"type":"element","tag":"code","props":{"code":" const requests = [\n contract.method.balanceOf().call,\n contract.method.getStaked().call\n ]\n\n const result = await makeBatchRequest(request);\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":" const requests = [\n contract.method.balanceOf().call,\n contract.method.getStaked().call\n ]\n\n const result = await makeBatchRequest(request);\n"}]}]}]},{"type":"element","tag":"code","props":{"code":"const web3 = new Web3(Web3.givenProvider || PROVIDER_URL);\n\nconst makeBatchRequest = (calls: any[]) => {\n try {\n const web3 = getWeb3NoAccount();\n const batch = new web3.BatchRequest();\n\n const promises = calls.map((call) => {\n return new Promise((resolve, reject) => {\n batch.add(\n call.request({}, (err, result) => {\n if (err) {\n reject(err);\n } else {\n resolve(result);\n }\n })\n );\n });\n });\n\n batch.execute();\n\n return Promise.all(promises);\n } catch {\n return null;\n }\n};\n\nexport default makeBatchRequest;\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":"const web3 = new Web3(Web3.givenProvider || PROVIDER_URL);\n\nconst makeBatchRequest = (calls: any[]) => {\n try {\n const web3 = getWeb3NoAccount();\n const batch = new web3.BatchRequest();\n\n const promises = calls.map((call) => {\n return new Promise((resolve, reject) => {\n batch.add(\n call.request({}, (err, result) => {\n if (err) {\n reject(err);\n } else {\n resolve(result);\n }\n })\n );\n });\n });\n\n batch.execute();\n\n return Promise.all(promises);\n } catch {\n return null;\n }\n};\n\nexport default makeBatchRequest;\n"}]}]}]},{"type":"element","tag":"h2","props":{"id":"subscribing-to-smart-contract-events"},"children":[{"type":"text","value":"Subscribing to smart contract events"}]},{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"There're different ways to subscribe for contract events. For all of them you will need following variables:"}]},{"type":"element","tag":"code","props":{"code":" import Web3 from 'web3';\n const web3 = new Web3('YOUR_RPC_ENDPOINT_HERE');\n const ABI = 'YOUR ABI HERE';\n const CONTRACT_ADDRESS = 'YOUR CONTRACT ADDRESS HERE';\n const myContract = new Web3.Contract(ABI, CONTRACT_ADDRESS);\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":" import Web3 from 'web3';\n const web3 = new Web3('YOUR_RPC_ENDPOINT_HERE');\n const ABI = 'YOUR ABI HERE';\n const CONTRACT_ADDRESS = 'YOUR CONTRACT ADDRESS HERE';\n const myContract = new Web3.Contract(ABI, CONTRACT_ADDRESS);\n"}]}]}]},{"type":"element","tag":"h3","props":{"id":"by-accessing-contractevents"},"children":[{"type":"text","value":"By accessing contract.events"}]},{"type":"element","tag":"code","props":{"code":"referralProgramContract.events\n .RegisterUser()\n .on('connected', (subscriptionId: string) => {\n console.log(`| UserRegistered | events | ${subscriptionId}`);\n })\n .on(\n 'data',\n async (event: {\n removed: boolean;\n returnValues: RegisterUserResponseInterface;\n }) => {\n try {\n if (event.removed) {\n return;\n }\n const { user, referrer } = event.returnValues;\n console.log(user, referrer);\n } catch (e) {\n console.log(`| ONCE | ${e}`);\n }\n },\n )\n .on('error', (error: ErrnoException) => {\n console.log(error);\n });\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":"referralProgramContract.events\n .RegisterUser()\n .on('connected', (subscriptionId: string) => {\n console.log(`| UserRegistered | events | ${subscriptionId}`);\n })\n .on(\n 'data',\n async (event: {\n removed: boolean;\n returnValues: RegisterUserResponseInterface;\n }) => {\n try {\n if (event.removed) {\n return;\n }\n const { user, referrer } = event.returnValues;\n console.log(user, referrer);\n } catch (e) {\n console.log(`| ONCE | ${e}`);\n }\n },\n )\n .on('error', (error: ErrnoException) => {\n console.log(error);\n });\n"}]}]}]},{"type":"element","tag":"h3","props":{"id":"with-filtering"},"children":[{"type":"text","value":"With filtering"}]},{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"We're listening to "},{"type":"element","tag":"code-inline","props":{},"children":[{"type":"text","value":"Transfer"}]},{"type":"text","value":" event here:"}]},{"type":"element","tag":"code","props":{"code":" let options = {\n filter: {\n value: [],\n },\n fromBlock: 0\n };\n\n myContract.events.Transfer(options)\n .on('data', event => console.log(event))\n .on('changed', changed => console.log(changed))\n .on('error', err => throw err)\n .on('connected', str => console.log(str))\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":" let options = {\n filter: {\n value: [],\n },\n fromBlock: 0\n };\n\n myContract.events.Transfer(options)\n .on('data', event => console.log(event))\n .on('changed', changed => console.log(changed))\n .on('error', err => throw err)\n .on('connected', str => console.log(str))\n"}]}]}]},{"type":"element","tag":"h3","props":{"id":"common-subscribe-method"},"children":[{"type":"text","value":"Common Subscribe method"}]},{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Filtering options can also be specified:"}]},{"type":"element","tag":"code","props":{"code":" let options = {\n fromBlock: 0,\n address: ['address-1', 'address-2'], //Only get events from specific addresses\n topics: [] //What topics to subscribe to\n };\n\n let subscription = ('logs', options, (err,event) => {\n if (!err)\n console.log(event)\n });\n\n subscription.on('data', event => console.log(event))\n subscription.on('changed', changed => console.log(changed))\n subscription.on('error', err => { throw err })\n subscription.on('connected', nr => console.log(nr))\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":" let options = {\n fromBlock: 0,\n address: ['address-1', 'address-2'], //Only get events from specific addresses\n topics: [] //What topics to subscribe to\n };\n\n let subscription = ('logs', options, (err,event) => {\n if (!err)\n console.log(event)\n });\n\n subscription.on('data', event => console.log(event))\n subscription.on('changed', changed => console.log(changed))\n subscription.on('error', err => { throw err })\n subscription.on('connected', nr => console.log(nr))\n"}]}]}]},{"type":"element","tag":"h3","props":{"id":"getting-event-history"},"children":[{"type":"text","value":"Getting event history"}]},{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Getting history for "},{"type":"element","tag":"code-inline","props":{},"children":[{"type":"text","value":"Transfer"}]},{"type":"text","value":" events for specific values. More info can be found "},{"type":"element","tag":"a","props":{"href":"https://web3js.readthedocs.io/en/v1.2.11/web3-eth-subscribe.html#","rel":["nofollow"]},"children":[{"type":"text","value":"here"}]}]},{"type":"element","tag":"code","props":{"code":" //example options(optional)\n let options = {\n filter: {\n // only get events where transfer value was 1000 or 1337\n value: ['1000', '1337'] \n },\n // number | \"earliest\" | \"pending\" | \"latest\"\n fromBlock: 0, \n toBlock: 'latest'\n };\n\n myContract.getPastEvents('Transfer', options)\n .then(results => console.log(results))\n .catch(err => throw err);\n\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":" //example options(optional)\n let options = {\n filter: {\n // only get events where transfer value was 1000 or 1337\n value: ['1000', '1337'] \n },\n // number | \"earliest\" | \"pending\" | \"latest\"\n fromBlock: 0, \n toBlock: 'latest'\n };\n\n myContract.getPastEvents('Transfer', options)\n .then(results => console.log(results))\n .catch(err => throw err);\n\n"}]}]}]}]},"body":{"type":"root","children":[{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"For common functions see "},{"type":"element","tag":"a","props":{"href":"Common%20typescript%20examples"},"children":[{"type":"text","value":"Common typescript examples"}]},{"type":"text","value":"."}]},{"type":"element","tag":"h2","props":{"id":"getting-smart-contract-instance"},"children":[{"type":"text","value":"Getting smart contract instance"}]},{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Useful for calling smart contract methods:"}]},{"type":"element","tag":"code","props":{"code":"import { Contract } from 'web3-eth-contract';\nimport { web3 } from '.';\n\nconst getContract = (abi: object, address?: string): Contract => {\n const abiFromJson = 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