# testnet-nitro-node

## Prerequisites

* Local:

  * Ansible: see [installation](https://git.vdb.to/cerc-io/testnet-ops#installation)

  * yq: see [installation](https://github.com/mikefarah/yq#install)

* On deployment machine:

  * laconic-so: see [installation](https://git.vdb.to/cerc-io/testnet-ops/src/branch/main/stack-orchestrator-setup/README.md)

## Setup

* On your local machine, clone the `cerc-io/testnet-ops` repository:

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

  cd testnet-ops/nitro-nodes-setup
  ```

* Fetch the required Nitro node config:

  ```bash
  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_l1_chain_url: ""
  # nitro_l2_chain_url: ""
  # na_address: ""
  # ca_address: ""
  # vpa_address: ""
  # l1_asset_address: ""
  # bridge_contract_address: ""
  # 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:

  ```bash
  # 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`:

  ```bash
  # Set path to desired deployments dir
  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:

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

### On Remote Host

* Create a new `hosts.ini` file:

   ```bash
   cp ../hosts.example.ini hosts.ini
   ```

* Edit the [`hosts.ini`](./hosts.ini) file to run the playbook on a remote machine:

  ```ini
  [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

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

  # 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:

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

### Check Deployment Status

* Run the following command in the directory where the deployments are created:

  ```bash
  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
  ```

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

* Run the following commands from the directory where the deployments are created

* Set required variables:

  ```bash
  cd $DEPLOYMENTS_DIR/nitro-node

  # Fetch the required Nitro node config
  wget https://git.vdb.to/cerc-io/testnet-laconicd-stack/raw/branch/main/ops/stage2/nitro-node-config.yml

  export BRIDGE_NITRO_ADDRESS=$(yq eval '.bridge_nitro_address' nitro-node-config.yml)
  export L1_ASSET_ADDRESS=$(yq eval '.l1_asset_address' nitro-node-config.yml)
  ```

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

  ```bash
  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:

  ```bash
  # 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 $L1_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](#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:

  ```bash
  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:

  ```bash
  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:

  ```bash
  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"
  #   }
  # ]
  ```

## Clean up

* Switch to deployments dir:

  ```bash
  cd $DEPLOYMENTS_DIR/nitro-node
  ```

* Stop all Nitro services running in the background:

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

* To stop all services and also delete data:

  ```bash
  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:

    ```bash
    cd $DEPLOYMENTS_DIR/nitro-node

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

  * Reset the node's durable store:

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

    mkdir l1-nitro-deployment/data/nitro_node_data
    ```

  * Restart the deployment:

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

* Retry the ledger channel creation command