Implementation of a Chainlink requesting contract.
- NPM
Package installation should have occurred for you during the Truffle Box setup. However, if you add dependencies, you'll need to add them to the project by running:
npm installOr
yarn installnpm testIf needed, edit the truffle-config.js config file to set the desired network to a different port. It assumes any network is running the RPC port on 8545.
npm run migrate:devFor deploying to live networks, Truffle will use truffle-hdwallet-provider for your mnemonic and an RPC URL. Set your environment variables $RPC_URL and $MNEMONIC before running:
npm run migrate:liveThere are 3 helper scripts provided with this box in the scripts directory:
fund-contract.jsrequest-data.jsread-contract.js
They can be used by calling them from npx truffle exec, for example:
npx truffle exec scripts/fund-contract.js --network liveThe CLI will output something similar to the following:
Using network 'live'.
Funding contract: 0x972DB80842Fdaf6015d80954949dBE0A1700705E
0xd81fcf7bfaf8660149041c823e843f0b2409137a1809a0319d26db9ceaeef650
Truffle v5.0.25 (core: 5.0.25)
Node v10.16.3
In the request-data.js script, example parameters are provided for you. You can change the oracle address, Job ID, and parameters based on the information available on our documentation.
npx truffle exec scripts/request-data.js --network liveThis creates a request and will return the transaction ID, for example:
Using network 'live'.
Creating request on contract: 0x972DB80842Fdaf6015d80954949dBE0A1700705E
0x828f256109f22087b0804a4d1a5c25e8ce9e5ac4bbc777b5715f5f9e5b181a4b
Truffle v5.0.25 (core: 5.0.25)
Node v10.16.3
After creating a request on a live network, you will want to wait 3 blocks for the Chainlink node to respond. Then call the read-contract.js script to read the contract's state.
npx truffle exec scripts/read-contract.js --network liveOnce the oracle has responded, you will receive a value similar to the one below:
Using network 'live'.
21568
Truffle v5.0.25 (core: 5.0.25)
Node v10.16.3