Theta Web3 by Example

Learn how to use Web3.js with Theta by examples!

References:

https://www.dappuniversity.com/articles/web3-js-intro

https://www.youtube.com/playlist?list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN

Getting Started

Setup Theta local privatenet

First, setup the Theta local privatenet and the ETH RPC adaptor following this guide. The ETH RPC adaptor running at http://localhost:18888/rpc interacts with the Web3.js library by translating the Theta RPC interface into the ETH RPC interface.

Fund the test accounts with some TFuel

Execute the two commands below to fun the test accounts with some TFuel:

export SEQ=`thetacli query account --address=0x2E833968E5bB786Ae419c4d13189fB081Cc43bab | grep sequence | grep -o '[[:digit:]]\+'`

thetacli tx send --chain="privatenet" --from=0x2E833968E5bB786Ae419c4d13189fB081Cc43bab --to=0x19E7E376E7C213B7E7e7e46cc70A5dD086DAff2A --tfuel=1000 --password=qwertyuiop --seq=$(($SEQ+1))

Install dependencies

Execute the command below to install dependencies:

npm install

Run the examples (Local privatenet)

Run the following scripts to interact with the Theta local privatenet through Web3.js. Note that the chainID of the Theta local privatenet is 366. When we compose the transactions, we need to specify the chainID, otherwise the transactions will be rejected by the blockchain.

# This example shows how to query the TFuel balance of a given account
node examples/account_query.js

# This example shows how to inspect the latest blocks
node examples/block_inspection.js

# This example shows how to deploy a smart contract to the local privatenet
node examples/contract_deploy.js

# This example shows how to send TFuel between two accounts
node examples/send_signed_transaction.js

# This example shows how some extra features of the Web3.js library
node examples/web3_extras.js

Run the examples (Mainnet)

The two examples below how to interact with the Theta mainnet through Web3.js.

# Query the TDROP contract (TNT20 token)
node examples/contract_read_mainnet.js

# Send TDROP (TNT20 token) between two accounts. Before running the example, make sure the sender account has enough TDROP to send, and enough TFUEL as the gas fee.
node examples/send_tnt20_token_mainnet.js

# List all the events emitted by the TDROP contract in the specified block range
node examples/events_filtering_mainnet.js