spectre

README

Spectre CLI Readme

Spectre is an application run by relays. It updates Oracles contracts.

Table of contents

• Installation
• Configuration
• Supported events
• Commands
• License

Installation

To install it, you'll first need Go installed on your machine. Then you can use standard Go command: go install github.com/chronicleprotocol/oracle-suite/cmd/spectre@latest

Alternatively, you can build Spectre using Makefile directly from the repository. This approach is recommended if you wish to work on Spectre source.

git clone https://github.com/chronicleprotocol/oracle-suite.git
cd oracle-suite
make

Configuration

To start working with Spectre, you have to create configuration file first. By default, the default config file location is config.hcl in the current working directory. You can change the config file location using the --config flag. Spectre supports HCL configuration format.

Configuration reference

This configuration is only a reference and not ready for use. The recommended configuration can be found in the config.hcl file located in the root directory.

# List of files to include. The files are included in the order they are specified.
# It supports glob patterns.
include = [
  "config/*.hcl"
]

# Custom variables. Accessible in the configuration under the `var` object, e.g. `var.feeds`.
variables {
  feeds = [
    "0x2D800d93B065CE011Af83f316ceF9F0d005B0AA4",
    "0xe3ced0f62f7eb2856d37bed128d2b195712d2644"
  ]
}

spectre {
  # List of feed addresses. Only messages signed by these addresses are accepted.
  feeds = var.feeds

  # Specifies how often in seconds Spectre should check if Oracle contract needs to be updated.
  interval = 60

  # Median contract configuration. Multiple median contracts can be configured.
  median {
    # Ethereum client to use for interacting with the Median contract.
    ethereum_client = "default"

    # Address of the Median contract.
    contract_addr = "0x1234567890123456789012345678901234567890"

    # Name of the pair to fetch the price for.
    pair = "ETHUSD"

    # Spread in percent points above which the price is considered stale.
    spread = 1

    # Time in seconds after which the price is considered stale.
    expiration = 86400
  }
}

ethereum {
  # Optional list of random Ethereum keys to use for signing. The name of the key is used to reference the key in other 
  # sections.
  rand_keys = ["key"]

  # Configuration for Ethereum keys. The key name is used to reference the key in other sections.
  # It is possible to have multiple keys in the configuration.
  key "default" {
    # Address of the Ethereum key. The address must be present in the keystore.
    address = "0x1234567890123456789012345678901234567890"

    # Path to the keystore directory.
    keystore_path = "./keystore"

    # Path to the file containing the passphrase for the keystore.
    # Optional.
    passphrase_file = "./passphrase"
  }

  # Configuration for Ethereum clients. The client name is used to reference the client in other sections.
  # It is possible to have multiple clients in the configuration.
  client "default" {
    # RPC URLs is a list of Ethereum RPC URLs to use for the client. Ethereum client uses RPC-Splitter which compares
    # responses from multiple RPC URLs to verify that none of them are compromised. At least three URLs are recommended
    # in case of using a 3rd party RPC service.
    rpc_urls = ["https://eth.public-rpc.com"]

    # Chain ID of the Ethereum network.
    chain_id = 1

    # Ethereum key to use for signing transactions.
    # Optional. If not specified, the default key is used, the signing is done by the Ethereum node.
    ethereum_key = "default"
  }
}

# Configuration for the transport layer. 
# Currently, libP2P and WebAPI transports are supported. At least one transport must be configured.
transport {
  # Configuration for the LibP2P transport. LibP2P transport uses peer-to-peer communication.
  # Optional.
  libp2p {
    # List of feed addresses. Only messages signed by these addresses are accepted.
    feeds = var.feeds
    
    # Seed used to generate the private key for the LibP2P node. 
    # Optional. If not specified, the private key is generated randomly.
    priv_key_seed = "8c8eba62d853d3abdd7f3298341a622a8a9df37c3aba788028c646bdd915227c"

    # Listen addresses for the LibP2P node. The addresses are encoded using multiaddr format.
    listen_addrs = ["/ip4/0.0.0.0/tcp/8000"]

    # Addresses of bootstrap nodes. The addresses are encoded using multiaddr format.
    bootstrap_addrs = [
      "/dns/spire-bootstrap1.makerops.services/tcp/8000/p2p/12D3KooWRfYU5FaY9SmJcRD5Ku7c1XMBRqV6oM4nsnGQ1QRakSJi",
      "/dns/spire-bootstrap2.makerops.services/tcp/8000/p2p/12D3KooWBGqjW4LuHUoYZUhbWW1PnDVRUvUEpc4qgWE3Yg9z1MoR"
    ]

    # Addresses of direct peers to connect to. The addresses are encoded using multiaddr format.
    # This option must be configured symmetrically on both ends.
    direct_peers_addrs = []

    # Addresses of peers to block. The addresses are encoded using multiaddr format.
    blocked_addrs = []

    # Disables node discovery. If disabled, the IP address of a node will not be broadcast to other peers. This option
    # should be used together with direct_peers_addrs.
    disable_discovery = false
  }

  # Configuration for the WebAPI transport. WebAPI transport allows to send messages using HTTP API. It is designed to 
  # use over secure network, e.g. Tor, I2P or VPN. WebAPI sends messages to other nodes using HTTP requests. The list of 
  # nodes is retrieved from the address book.
  # Optional.
  webapi {
    # List of feed addresses. Only messages signed by these addresses are accepted.
    feeds = var.feeds
    
    # Listen address for the WebAPI transport. The address must be in the format `host:port`.
    # If used with Tor, it is recommended to listen on 0.0.0.0 address.
    listen_addr = "0.0.0.0.8080"

    # Address of SOCKS5 proxy to use for the WebAPI transport. The address must be in the format `host:port`.
    # Optional.
    socks5_proxy_addr = "127.0.0.1:9050"

    # Ethereum key to sign messages that are sent to other nodes. The key must be present in the `ethereum` section.
    # Other nodes only accept messages that are signed by the key that is on the feeds list.
    ethereum_key = "default"

    # Ethereum address book that uses an Ethereum contract to fetch the list of node's addresses.
    # Optional.
    ethereum_address_book {
      # Ethereum contract address where the list of node's addresses is stored.
      contract_addr = "0x1234567890123456789012345678901234567890"

      # Ethereum client to use for fetching the list of node's addresses.
      ethereum_client = "default"
    }

    # Static address book that uses a static list of node's addresses.
    # Optional.
    static_address_book {
      addresses = ["0x1234567890123456789012345678901234567890", "0x1234567890123456789012345678901234567891"]
    }
  }
}

Environment variables

It is possible to use environment variables anywhere in the configuration file. Environment variables are accessible in the env object. For example, to use the HOME environment variable in the configuration file, use env.HOME.

Commands

Usage:
  spectre [command]

Available Commands:
  completion  Generate the autocompletion script for the specified shell
  help        Help about any command
  run         

Flags:
  -c, --config string                                  spectre config file (default "./config.hcl")
  -h, --help                                           help for spectre
      --log.format text|json                           log format (default text)
  -v, --log.verbosity panic|error|warning|info|debug   verbosity level (default warning)
      --version                                        version for spectre

Use "spectre [command] --help" for more information about a command.

License

The GNU Affero General Public License