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Cactus electricity-trade

Abstract

Cactus electricity-trade is a sample application for exchanging electricity (which is measured by a device that is logging to a Sawtooth blockchain) for ETH currency on a private Ethereum blockchain. When the measuring device detects power usage, a Sawtooth transaction triggers a Cactus LedgerEvent to pay the device user's currency on the Ethereum blockchain, where the amount paid is proportional to the amount of power usage recorded on the Sawtooth blockchain. In this example, we use the Sawtooth intkey transaction processor as an application for power measurement logging.

electricity-trade image

Required software components

  • OS: Linux (recommend: Ubuntu18.04 or CentOS7)
  • Docker (recommend: v17.06.2-ce or greater)
  • Docker-compose (recommend: v1.14.0 or greater)
  • node.js v12 (recommend: v12.20.2 or greater)

Prerequisites

  • Available ports:
    • 5034: the port of cactus-cmd-socketio-server
    • 5050: the port of cactus-plugin-ledger-connector-go-ethereum-socketio
    • 5140: the port of cactus-plugin-ledger-connector-sawtooth-socketio
    • If it is already used, the following processes can be done by changing the port number setting
  • Available directory (This directory must be empty):
    • /etc/cactus: the directory for storing the config files of cactus-cmd-socketio-server

Boot method

  1. Before booting, please prepare the directory for storing config files on the directoty /etc/cactus on your server

    sudo mkdir /etc/cactus
sudo chmod 777 /etc/cactus

  2. Before booting, please modify applicationHostInfo.hostName and applicationHostInfo.hostPort on cactus/etc/cactus/default.yaml to adjust to your environment.

    vi cactus/etc/cactus/default.yaml

[cactus/etc/cactus/default.yaml]
applicationHostInfo:
  hostName: http://aaa.bbb.ccc.ddd # please change hostName to your IP address
  hostPort: 5034 # if you want to change the port number, please change hostPort to the port number which you want to use

  3. Start ledgers:

    cd cactus/examples/electricity-trade/
./script-start-ledgers.sh
    • (NOTICE: Before executing the above, your account needs to be added to the docker group (usermod -a -G docker YourAccount from root user))
    • If the following containers are started when displaying the container list with the docker ps command, it will be fine. 
      CONTAINER ID        IMAGE                                              COMMAND                  CREATED             STATUS              PORTS                                                    NAMES
6fe03a6e1716        hyperledger/sawtooth-shell:nightly                 "bash -c 'sawtooth k…"   4 hours ago         Up 4 hours          4004/tcp, 8008/tcp                                       sawtooth-shell-default
c5bbe6ea9904        hyperledger/sawtooth-settings-tp:nightly           "settings-tp -vv -C …"   4 hours ago         Up 4 hours          4004/tcp                                                 sawtooth-settings-tp-default
016eaa658ed2        hyperledger/sawtooth-intkey-tp-python:nightly      "intkey-tp-python -v…"   4 hours ago         Up 4 hours          4004/tcp                                                 sawtooth-intkey-tp-python-default
95b77877b672        hyperledger/sawtooth-xo-tp-python:nightly          "xo-tp-python -vv -C…"   4 hours ago         Up 4 hours          4004/tcp                                                 sawtooth-xo-tp-python-default
1d7ecbc5b84d        hyperledger/sawtooth-rest-api:nightly              "sawtooth-rest-api -…"   4 hours ago         Up 4 hours          4004/tcp, 0.0.0.0:8008->8008/tcp                         sawtooth-rest-api-default
b44ffa3b385f        hyperledger/sawtooth-devmode-engine-rust:nightly   "devmode-engine-rust…"   4 hours ago         Up 4 hours                                                                   sawtooth-devmode-engine-rust-default
8f50d8fbe985        hyperledger/sawtooth-validator:nightly             "bash -c 'sawadm key…"   4 hours ago         Up 4 hours          0.0.0.0:4004->4004/tcp                                   sawtooth-validator-default
b519eb5ed1cd        ethereum/client-go:v1.8.27                         "geth --rpc --networ…"   4 hours ago         Up 4 hours          8546/tcp, 0.0.0.0:8545->8545/tcp, 30303/tcp, 30303/udp   geth1

  4. Please prepare the three consoles on your machine as the following:

    • console 1: console for launching cactus-plugin-ledger-connector-go-ethereum-socketio
    • console 2: console for launching cactus-plugin-ledger-connector-sawtooth-socketio
    • console 3: console for launching cactus-cmd-socketio-server including electricity-trade business logic application.

  5. Launch the validators:

    • Please execute the boot methods of cactus-plugin-ledger-connector-go-ethereum-socketio on the console 1 using the port 5050
    • Please execute the boot methods of cactus-plugin-ledger-connector-sawtooth-socketio on the console 2 using the port 5140

  6. Launch cactus-cmd-socketio-server including electricity-trade business logic application:

    • Use the console 3
    • Build base npm packages (including cactus-cmd-socketio-server) from cactus root directory 
      npm run configure
    • Install and build npm packages on examples/electricity-trade 
      cd ./examples/electricity-trade
npm install
npm run build
    • Launch the cactus-cmd-socketio-server including electricity-trade business logic application 
      cd ./examples/electricity-trade
npm run start
    • After executing the above script, cactus-cmd-socketio-server is launched on the port 5034.

How to use this application

Assumption

  • The parameters are used on this application
    • Source account on Ethereum: 06fc56347d91c6ad2dae0c3ba38eb12ab0d72e97
    • The privkey of source account on Ethereum: cb5d48d371916a4ea1627189d8af4f642a5d72746a06b559780c3f5932658207
    • Destination account on Ethereum: 9d624f7995e8bd70251f8265f2f9f2b49f169c55
    • The key name of intkey on Sawtooth: MI000001

Setup the application

  1. Set the intkey script on Sawtooth docker: 
    ./script-set-sawtooth-intkey.sh
  2. Register on account information: 
    curl localhost:5034/api/v1/bl/electricity-trade/meter/register/ -XPOST -H "Content-Type: application/json" -d '{"businessLogicID":"h40Q9eMD","meterParams":["MI000001", "06fc56347d91c6ad2dae0c3ba38eb12ab0d72e97", "cb5d48d371916a4ea1627189d8af4f642a5d72746a06b559780c3f5932658207", "9d624f7995e8bd70251f8265f2f9f2b49f169c55"]}'

Run the application

  1. (Optional) Check the balance on Ethereum accounts using the following script

    • Check the balance of the source account as the following:
    curl localhost:5034/api/v1/bl/balance/06fc56347d91c6ad2dae0c3ba38eb12ab0d72e97
    • The result: {"status":200,"amount":100000}
    • Check the balance of the destination account:
    curl localhost:5034/api/v1/bl/balance/9d624f7995e8bd70251f8265f2f9f2b49f169c55
    • The result: {"status":200,"amount":0}

  2. Start the electricity-trade application

    curl localhost:5034/api/v1/bl/electricity-trade/ -XPOST -H "Content-Type: application/json" -d '{"businessLogicID":"h40Q9eMD"}'
    • The example response of tradeID: {"tradeID":"20210220075755506-001"}
    • (Then, the application starts to monitor the Sawtooth blockchain)

  3. Execute the intkey transaction on Sawtooth blockchain

    • Open the docker bash: 
      docker exec -it sawtooth-shell-default bash
    • Execute the intkey transaction: 
      intkey create_batch --key-name MI000001 --value-set 50 --value-inc 24
sawtooth batch submit -f batches.intkey --url http://rest-api:8008
    • (In the above, the value of the key MI000001 is set as 50, and increased by 24)
    • After that, exit the docker bash: 
      exit

  4. (Optional) Check the balance on Ethereum accounts using the following script

    • Check the balance of the source account as the following:
    curl localhost:5034/api/v1/bl/balance/06fc56347d91c6ad2dae0c3ba38eb12ab0d72e97
    • The result: {"status":200,"amount":99976}
    • Check the balance of the destination account:
    curl localhost:5034/api/v1/bl/balance/9d624f7995e8bd70251f8265f2f9f2b49f169c55
    • The result: {"status":200,"amount":24}
    • (The result shows that the asset was transferred between Ethereum addresses depending on the value of the change in Sawtooth intkey.)

How to stop the application and cleanup Docker containers

  1. Stop the validators and cactus-cmd-server-socket
    • Press Ctrl+C on the above the console 1, 2, and 3.
  2. Remove the config files on your machine 
    sudo rm -r /etc/cactus/
  3. Cleanup the docker containers of Ethereum and Sawtooth
    • Run ./cleanup.sh