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This is a demo of Gno smart contract programming. This document was constructed by Gno onto a smart contract hosted on the data Realm name "gno.land/r/demo/boards" (github).

Build gnokey, create your account, and interact with Gno.

NOTE: Where you see -remote localhost:26657 here, that flag can be replaced with -remote gno.land:26657 if you have $GNOT on the testnet. (To use the testnet, also replace -chainid dev with -chainid portal-loop .)

Build gnokey (and other tools).

git clone git@github.com:gnolang/gno.git
cd gno/gno.land
make build

Generate a seed/mnemonic code.

./build/gnokey generate

NOTE: You can generate 24 words with any good bip39 generator.

Create a new account using your mnemonic.

./build/gnokey add -recover KEYNAME

NOTE: KEYNAME is your key identifier, and should be changed.

Verify that you can see your account locally.

./build/gnokey list

Take note of your addr which looks something like g17sphqax3kasjptdkmuqvn740u8dhtx4kxl6ljf . You will use this as your ACCOUNT_ADDR.

Interact with the blockchain.

Add $GNOT for your account.

Before starting the gnoland node for the first time, your new account can be given $GNOT in the node genesis. Edit the file gno.land/genesis/genesis_balances.txt and add the following line (simlar to the others), using your ACCOUNT_ADDR and KEYNAME

ACCOUNT_ADDR=10000000000ugnot # @KEYNAME

Alternative: Run a faucet to add $GNOT.

Instead of editing gno.land/genesis/genesis_balances.txt, a more general solution (with more steps) is to run a local "faucet" and use the web browser to add $GNOT. (This can be done at any time.) See this page: https://github.com/gnolang/gno/blob/master/contribs/gnofaucet/README.md

Start the gnoland node.

./build/gnoland start

NOTE: The node already has the "boards" realm.

Leave this running in the terminal. In a new terminal, cd to the same folder gno/gno.land .

Get your current balance, account number, and sequence number.

./build/gnokey query auth/accounts/ACCOUNT_ADDR -remote localhost:26657

Register a board username with a smart contract call.

The USERNAME for posting can different than your KEYNAME. It is internally linked to your ACCOUNT_ADDR. It must be at least 6 characters, lowercase alphanumeric with underscore.

./build/gnokey maketx call -pkgpath "gno.land/r/demo/users" -func "Register" -args "" -args "USERNAME" -args "Profile description" -gas-fee "10000000ugnot" -gas-wanted "2000000" -send "200000000ugnot" -broadcast -chainid dev -remote 127.0.0.1:26657 KEYNAME

Interactive documentation: https://gno.land/r/demo/users$help&func=Register

Create a board with a smart contract call.

./build/gnokey maketx call -pkgpath "gno.land/r/demo/boards" -func "CreateBoard" -args "BOARDNAME" -gas-fee "1000000ugnot" -gas-wanted "10000000" -broadcast -chainid dev -remote localhost:26657 KEYNAME

Interactive documentation: https://gno.land/r/demo/boards$help&func=CreateBoard

Next, query for the permanent board ID by querying (you need this to create a new post):

./build/gnokey query "vm/qeval" -data 'gno.land/r/demo/boards.GetBoardIDFromName("BOARDNAME")' -remote localhost:26657

Create a post of a board with a smart contract call.

NOTE: If a board was created successfully, your SEQUENCE_NUMBER would have increased.

./build/gnokey maketx call -pkgpath "gno.land/r/demo/boards" -func "CreateThread" -args BOARD_ID -args "Hello gno.land" -args "Text of the post" -gas-fee 1000000ugnot -gas-wanted 2000000 -broadcast -chainid dev -remote localhost:26657 KEYNAME

Interactive documentation: https://gno.land/r/demo/boards$help&func=CreateThread

Create a comment to a post.

./build/gnokey maketx call -pkgpath "gno.land/r/demo/boards" -func "CreateReply" -args BOARD_ID -args "1" -args "1" -args "Nice to meet you too." -gas-fee 1000000ugnot -gas-wanted 2000000 -broadcast -chainid dev -remote localhost:26657 KEYNAME

Interactive documentation: https://gno.land/r/demo/boards$help&func=CreateReply

./build/gnokey query "vm/qrender" -data "gno.land/r/demo/boards:BOARDNAME/1" -remote localhost:26657

Render page with optional path expression.

The contents of https://gno.land/r/demo/boards: and https://gno.land/r/demo/boards:gnolang are rendered by calling the Render(path string) function like so:

./build/gnokey query "vm/qrender" -data "gno.land/r/demo/boards:gnolang"

View the board in the browser.

Start the web server.

./build/gnoweb

This should print something like Running on http://127.0.0.1:8888 . Leave this running in the terminal.

View in the browser

In your browser, navigate to the printed address http://127.0.0.1:8888 . To see you post, click on the package /r/demo/boards .