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testnet-laconicd-stack/testnet-nitro-node.md

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testnet-nitro-node

Prerequisites

  • Local:

    • Clone the cerc-io/testnet-ops repository:

      git clone git@git.vdb.to:cerc-io/testnet-ops.git

    • Ansible: see installation

  • On deployment machine:

Setup

  • Move to nitro-nodes-setup :

    cd testnet-ops/nitro-nodes-setup

  • Fetch the required Nitro node config:

    wget -O nitro-vars.yml https://git.vdb.to/cerc-io/testnet-laconicd-stack/raw/branch/main/ops/stage2/nitro-node-config.yml

# Expected variables in the fetched config file:

# nitro_chain_url: ""
# na_address: ""
# ca_address: ""
# vpa_address: ""
# asset_address: ""
# nitro_chain_start_block: 0
# bridge_nitro_address: ""
# nitro_l1_bridge_multiaddr: ""
# nitro_l2_bridge_multiaddr: ""

  • TODO: Get L1 tokens on your address

  • Edit nitro-vars.yml and add the following variables:

    # Private key for your Nitro account (same as the one used in stage0 onboarding)
# Export the key from Laconic wallet (https://wallet.laconic.com)
nitro_sc_pk: ""

# Private key for a funded account on L1
# This account should have L1 tokens for funding your Nitro channels
nitro_chain_pk: ""

# Multiaddr with publically accessible IP address / DNS for your L1 nitro node
# Use port 3007
# Example: "/ip4/192.168.x.y/tcp/3007"
# Example: "/dns4/example.com/tcp/3007"
nitro_l1_ext_multiaddr: ""

# Multiaddr with publically accessible IP address / DNS for your L2 nitro node
# Use port 3009
# Example: "/ip4/192.168.x.y/tcp/3009"
# Example: "/dns4/example.com/tcp/3009"
nitro_l2_ext_multiaddr: ""

  • Update the target dir in setup-vars.yml:

    # Set path to desired deployments dir (under your user)
DEPLOYMENTS_DIR=<path-to-deployments-dir>

sed -i "s|^nitro_directory:.*|nitro_directory: $DEPLOYMENTS_DIR/nitro-node|" setup-vars.yml

# Will create deployments at $DEPLOYMENTS_DIR/nitro-node/l1-nitro-deployment and $DEPLOYMENTS_DIR/nitro-node/l2-nitro-deployment

Run Nitro Nodes

Nitro nodes can be run using Ansible either locally or on a remote machine; follow corresponding steps for your setup

On Local Host

  • Setup and run a Nitro node (L1+L2) by executing the run-nitro-nodes.yml Ansible playbook:

    LANG=en_US.utf8 ansible-playbook -i localhost, --connection=local run-nitro-nodes.yml --extra-vars='{ "target_host": "localhost"}' --user $USER

On Remote Host

  • In testnet-ops/nitro-nodes-setup, create a new hosts.ini file:

    cp ../hosts.example.ini hosts.ini

  • Edit the hosts.ini file to run the playbook on a remote machine:

    [<deployment_host>]
<host_name> ansible_host=<target_ip> ansible_user=<ssh_user> ansible_ssh_common_args='-o ForwardAgent=yes'
    • Replace <deployment_host> with nitro_host
    • Replace <host_name> with the alias of your choice
    • Replace <target_ip> with the IP address or hostname of the target machine
    • Replace <ssh_user> with the SSH username (e.g., dev, ubuntu)

  • Verify that you are able to connect to the host using the following command

    ansible all -m ping -i hosts.ini -k

# If using password based authentication, enter the ssh password on prompt; otherwise, leave it blank

# Expected output:

# <host_name> | SUCCESS => {
#  "ansible_facts": {
#      "discovered_interpreter_python": "/usr/bin/python3.10"
#  },
#  "changed": false,
#  "ping": "pong"
# }

  • Execute the run-nitro-nodes.yml Ansible playbook for remote deployment:

    LANG=en_US.utf8 ansible-playbook -i hosts.ini run-nitro-nodes.yml --extra-vars='{ "target_host": "nitro_host"}' --user $USER -kK

# If using password based authentication, enter the ssh password on prompt; otherwise, leave it blank
# Enter the sudo password as "BECOME password" on prompt

Check Deployment Status

  • Run the following commands on deployment machine:

    DEPLOYMENTS_DIR=<path-to-deployments-dir>

cd $DEPLOYMENTS_DIR/nitro-node

# Check the logs, ensure that the nodes are running
laconic-so deployment --dir l1-nitro-deployment logs nitro-node -f
laconic-so deployment --dir l2-nitro-deployment logs nitro-node -f

# Let L1 node sync up with the chain
# Expected logs after sync:
# nitro-node-1  | 2:04PM INF Initializing Http RPC transport...
# nitro-node-1  | 2:04PM INF Completed RPC server initialization url=127.0.0.1:4005/api/v1

  • Get your Nitro node's info:

    laconic-so deployment --dir l1-nitro-deployment exec nitro-rpc-client "nitro-rpc-client get-node-info -p 4005 -h nitro-node"

# Expected output:
# {
#   "SCAddress": "0xd0eA8b27591b1D070cCcD4D30b8D408fe794FDfc",
#   "MessageServicePeerId": "16Uiu2HAmSHRjoxveaPmJipzmdq69U8zme8BMnFjSBPferj1E5XAd"
# }

# SCAddress -> nitro address, MessageServicePeerId -> libp2p peer id

Create Channels

Create a ledger channel with the bridge on L1 which is mirrored on L2

  • Run the following commands on deployment machine

  • Set required variables:

    DEPLOYMENTS_DIR=<path-to-deployments-dir>

cd $DEPLOYMENTS_DIR/nitro-node

export BRIDGE_NITRO_ADDRESS=$(yq eval '.bridge_nitro_address' nitro-node-config.yml)
export ASSET_ADDRESS=$(yq eval '.asset_address' nitro-node-config.yml)

  • Check that check that you have no existing channels on L1 or L2:

    laconic-so deployment --dir l1-nitro-deployment exec nitro-rpc-client "nitro-rpc-client get-all-ledger-channels -p 4005 -h nitro-node"
laconic-so deployment --dir l2-nitro-deployment exec nitro-rpc-client "nitro-rpc-client get-all-ledger-channels -p 4005 -h nitro-node"

# Expected output:
# []

  • Create a ledger channel between your L1 Nitro node and Bridge with custom asset:

    # Set amount to ledger
LEDGER_AMOUNT=1000000

laconic-so deployment --dir l1-nitro-deployment exec nitro-rpc-client "nitro-rpc-client direct-fund $BRIDGE_NITRO_ADDRESS --assetAddress $ASSET_ADDRESS --alphaAmount $LEDGER_AMOUNT --betaAmount $LEDGER_AMOUNT -p 4005 -h nitro-node"

# Follow your L1 Nitro node logs for progress

# Expected Output:
# Objective started DirectFunding-0x161d289a50222caa781db215bb82a3ede4f557217742245525b8e8cbff04ec21
# Channel Open 0x161d289a50222caa781db215bb82a3ede4f557217742245525b8e8cbff04ec21

# Set the resulting ledger channel id in a variable
export LEDGER_CHANNEL_ID=
    • Check the Troubleshooting section if command to create a ledger channel fails or gets stuck

  • Once direct-fund objective is complete, the bridge will create a mirrored channel on L2

  • Check L2 Nitro node's logs to see that a bridged-fund objective completed:

    laconic-so deployment --dir l2-nitro-deployment logs nitro-node -f --tail 30

# Expected Output:
# nitro-node-1  | 5:01AM INF INFO Objective cranked address=0xaaa6628ec44a8a742987ef3a114ddfe2d4f7adce objective-id=bridgedfunding-0x6a9f5ccf1fa802525d794f4a899897f947615f6acc7141e61e056a8bfca29179 waiting-for=WaitingForNothing
# nitro-node-1  | 5:01AM INF INFO Objective is complete & returned to API address=0xaaa6628ec44a8a742987ef3a114ddfe2d4f7adce objective-id=bridgedfunding-0x6a9f5ccf1fa802525d794f4a899897f947615f6acc7141e61e056a8bfca29179

  • Check status of L1 ledger channel with the bridge using channel id:

    laconic-so deployment --dir l1-nitro-deployment exec nitro-rpc-client "nitro-rpc-client get-ledger-channel $LEDGER_CHANNEL_ID -p 4005 -h nitro-node"

# Expected output:
# {
#   ID: '0x161d289a50222caa781db215bb82a3ede4f557217742245525b8e8cbff04ec21',
#   Status: 'Open',
#   Balance: {
#     AssetAddress: '<l1-asset-address>',
#     Me: '<your-nitro-address>',
#     Them: '<bridge-nitro-address>',
#     MyBalance: <ledger-amount>n,
#     TheirBalance: <ledger-amount>n
#   },
#   ChannelMode: 'Open'
# }

  • Check status of the mirrored channel on L2:

    laconic-so deployment --dir l2-nitro-deployment exec nitro-rpc-client "nitro-rpc-client get-all-ledger-channels -p 4005 -h nitro-node"

# Expected output:
# [
#   {
#     "ID": "0x6a9f5ccf1fa802525d794f4a899897f947615f6acc7141e61e056a8bfca29179",
#     "Status": "Open",
#     "Balance": {
#       "AssetAddress": "<l2-asset-address>",
#       "Me": "<your-nitro-address>",
#       "Them": "<bridge-nitro-address>",
#       "MyBalance": <ledger-amount>n,
#       "TheirBalance": <ledger-amount>n
#     },
#     "ChannelMode": "Open"
#   }
# ]

Payments On L2 Channel

Perform payments using a virtual payment channel created with another Nitro node over the mirrored L2 channel with bridge as an intermediary

  • Run the following commands on deployment machine

  • Switch to the nitro-node directory:

    DEPLOYMENTS_DIR=<path-to-deployments-dir>

cd $DEPLOYMENTS_DIR/nitro-node

  • Check status of the mirrored channel on L2:

    laconic-so deployment --dir l2-nitro-deployment exec nitro-rpc-client "nitro-rpc-client get-all-ledger-channels -p 4005 -h nitro-node"

# Expected output:
# [
#   {
#     "ID": "0x6a9f5ccf1fa802525d794f4a899897f947615f6acc7141e61e056a8bfca29179",
#     "Status": "Open",
#     "Balance": {
#       "AssetAddress": "<l2-asset-address>",
#       "Me": "<your-nitro-address>",
#       "Them": "<bridge-nitro-address>",
#       "MyBalance": Xn,
#       "TheirBalance": Yn
#     },
#     "ChannelMode": "Open"
#   }
# ]

  • Set required variables:

    export BRIDGE_NITRO_ADDRESS=$(yq eval '.bridge_nitro_address' nitro-node-config.yml)

# Counterparty to create the payment channel with
export COUNTER_PARTY_ADDRESS=<counterparty-nitro-address>

# Mirrored channel on L2
export L2_CHANNEL_ID=<l2-channel-id>

# Amount to create the payment channel with
export PAYMENT_CHANNEL_AMOUNT=10000

  • Check for existing payment channels for the L2 channel:

    laconic-so deployment --dir l2-nitro-deployment exec nitro-rpc-client "nitro-rpc-client get-payment-channels-by-ledger $L2_CHANNEL_ID -p 4005 -h nitro-node"

  • Create a virtual payment channel:

    laconic-so deployment --dir l2-nitro-deployment exec nitro-rpc-client "nitro-rpc-client virtual-fund $COUNTER_PARTY_ADDRESS $BRIDGE_NITRO_ADDRESS --amount $PAYMENT_CHANNEL_AMOUNT -p 4005 -h nitro-node"

# Follow your L2 Nitro node logs for progress

# Expected Output:
# Objective started VirtualFund-0x43db45a101658387263b36d613322cc952d8ce5b70de51e3a495513c256bef4d
# Channel Open 0x43db45a101658387263b36d613322cc952d8ce5b70de51e3a495513c256bef4d

# Set the resulting payment channel id in a variable
PAYMENT_CHANNEL_ID=<payment-channel-id>

    Multiple virtual payment channels can be created at once

  • Check the payment channel's status:

    laconic-so deployment --dir l2-nitro-deployment exec nitro-rpc-client "nitro-rpc-client get-payment-channel $PAYMENT_CHANNEL_ID -p 4005 -h nitro-node"

# Expected output:
# {
#   ID: '0xb29aeb32c9495a793ebf7bd116232075d1e7bfe89fc82281c7d498e3ffd3e3bf',
#   Status: 'Open',
#   Balance: {
#     AssetAddress: '0x0000000000000000000000000000000000000000',
#     Payee: '<your-nitro-address>',
#     Payer: '<counterparty-nitro-address>',
#     PaidSoFar: 0n,
#     RemainingFunds: <payment-channel-amount>n
#   }
# }

  • Send payments using the virtual payment channel:

    export PAY_AMOUNT=200
laconic-so deployment --dir l2-nitro-deployment exec nitro-rpc-client "nitro-rpc-client pay $PAYMENT_CHANNEL_ID $PAY_AMOUNT -p 4005 -h nitro-node"

# Expected output
# {
#   Amount: <pay-amount>,
#   Channel: '<payment-channel-id>'
# }

# This can be done multiple times until the payment channel balance is exhausted

  • Check payment channel's status again to view updated channel state

  • Close the payment channel to settle on the L2 mirrored channel:

    laconic-so deployment --dir l2-nitro-deployment exec nitro-rpc-client "nitro-rpc-client virtual-defund $PAYMENT_CHANNEL_ID -p 4005 -h nitro-node"

# Expected output:
# Objective started VirtualDefund-0x43db45a101658387263b36d613322cc952d8ce5b70de51e3a495513c256bef4d
# Channel complete 0x43db45a101658387263b36d613322cc952d8ce5b70de51e3a495513c256bef4d

  • Check L2 mirrored channel's status after the virtual payment channel is closed:

    laconic-so deployment --dir l2-nitro-deployment exec nitro-rpc-client "nitro-rpc-client get-all-ledger-channels -p 4005 -h nitro-node"

# Expected output:
# [
#   {
#     "ID": "0x6a9f5ccf1fa802525d794f4a899897f947615f6acc7141e61e056a8bfca29179",
#     "Status": "Open",
#     "Balance": {
#       "AssetAddress": "<l2-asset-address>",
#       "Me": "<your-nitro-address>",
#       "Them": "<bridge-nitro-address>",
#       "MyBalance": <your-updated-balance>n,
#       "TheirBalance": <bridge-updated-balance>n
#     },
#     "ChannelMode": "Open"
#   }
# ]

    Your balance on the L2 channel should be reduced by total payments done on the virtual payment channel

Clean up

  • Switch to deployments dir:

    cd $DEPLOYMENTS_DIR/nitro-node

  • Stop all Nitro services running in the background:

    laconic-so deployment --dir l1-nitro-deployment stop
laconic-so deployment --dir l2-nitro-deployment stop

  • To stop all services and also delete data:

    laconic-so deployment --dir l1-nitro-deployment stop --delete-volumes
laconic-so deployment --dir l2-nitro-deployment stop --delete-volumes

# Remove deployment directories (deployments will have to be recreated for a re-run)
sudo rm -r l1-nitro-deployment
sudo rm -r l2-nitro-deployment

Troubleshooting

  • Stop (Ctrl+C) the direct-fund command if it is stuck

  • Restart the L1 Nitro node:

    • Stop the deployment:

      cd $DEPLOYMENTS_DIR/nitro-node

laconic-so deployment --dir l1-nitro-deployment stop

    • Reset the node's durable store:

      sudo rm -rf l1-nitro-deployment/data/nitro_node_data

mkdir l1-nitro-deployment/data/nitro_node_data

    • Restart the deployment:

      laconic-so deployment --dir l1-nitro-deployment start

  • Retry the ledger channel creation command