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Using Oraclize APIs in Smart Contract

Requirement

  • node ^8.0.0
  • npm ^5.0.0
  • truffle v4

Installation

# oraclize-test
git clone https://github.com/maggie-5miles/oraclize-test.git
cd oraclize-test
npm install
truffle compile

# download ethereum-bridge somewhere else on your computer, completely independent of this project
git clone https://github.com/oraclize/ethereum-bridge.git
cd ethereum-bridge
npm install

# make sure Ganache-CLI are installed globally 
npm install -g ganache-cli

Ropsten

Navigate to the oraclize-test folder:

truffle test --network ropsten

Output will look like:

Using network 'ropsten'.

  Contract: Template
randomNumber:  496
    ✓ sends a query and receives a response (43457ms)

Stopped watching!

  1 passing (1m)

Ganache + Ethereum-Bridge

Start Ganache-CLI

ganache-cli

In another terminal window, navigate to the ethereum-bridge folder and run the following command:

node bridge -H localhost:8545 -a 2 --dev

Run test in a third window

truffle test

Output will look like:

Using network 'development'.

  Contract: Template
randomNumber:  113
    ✓ sends a query and receives a response (14839ms)

  1 passing (15s)