Sygma fee oracle is a go implemented, centralized service that provides the endpoints to Sygma UI for all necessary data related to bridging fee.
There are three main parts in fee oracle codebase in an abstract way: App base, Data fetcher, Data provider.
- App base: This is the combination of
base,app,configpackages. App base loads the config, preforms health check and starts the server when fee oracle launches. It maintains the cleanup process when the app gets the termination signal. - Data fetcher: This is the combination of
oracle,store,cronjobpackages. Data fetcher follows the scheduled jobs to fetch data from registered external oracles and store data into store module. - Data provider: This is the combination of
store,api,consensus,identitypackages. Data provider queries the store based on the request from the endpoint, refines the data based on the configuredstrategy, then returns the data along with the signature of the fee oracle identity key.
Make sure Go1.17 has been installed.
This will clone the main branch of fee oracle codebase to your workplace dir and compile the binary into your
$GOPATH/bin
$ mkdir workplace && cd workplace
$ git clone https://github.com/ChainSafe/Sygma-fee-oracle.git
$ make install
Fee oracle needs three config files in the ./ dir of the codebase:
config.yaml: this is the fee oracle application config file.domain.json: this is the domain config file.
Template of the config.yaml can be found in ./config/config.template.yaml.
For domain configuration, it is possible to use local file, or the shared configuration file that is uploaded to some remote service (eg. ipfs). Depending on if the URL or file path is provided to the flag domain_config_path, the application will use the domain configuration from local file or from the remote service.
This file indicates all the domains and resources the fee oracle needs to fetch data for. Details need to be matched with
Sygma core configuration, such as id.
Sygma currently does not support bridging the native currency, such as Ether on Ethereum, Matic on Polygon, however, the id is constructed with zero address and its native domainId and is used in baseRate calculation internally.
Example:
{
"domains": [
{
"id": 0,
"name": "ethereum",
"nativeTokenDecimals": 18,
"nativeTokenSymbol": "eth",
"resources": [
{
"resourceId": "0x0000000000000000000000000000000000000000000000000000000000000001",
"decimals": 18,
"symbol": "usdt"
}
]
},
{
"id": 1,
"name": "polygon",
"nativeTokenDecimals": 18,
"nativeTokenSymbol": "matic",
"resources": [
{
"resourceId": "0x0000000000000000000000000000000000000000000000000000000000000001",
"decimals": 18,
"symbol": "usdt"
}
]
},
{
"id": 2,
"name": "moonbeam",
"nativeTokenDecimals": 18,
"nativeTokenSymbol": "glmr",
"resources": [
{
"resourceId": "0x0000000000000000000000000000000000000000000000000000000000000001",
"decimals": 18,
"symbol": "usdt"
}
]
}
]
}Each fee oracle server associates with a private key, which is used to sign the endpoint response data.
There should be a keyfile.priv keyfile in the root dir of the fee oracle codebase, or you can specify which keyfile to use in CLI.
Fee oracle provides key generation CLI, keyfile needs to be generated separately.
To quickly start from makefile, make sure config.yaml, domain.json, resource.json and keyfile.priv are ready in the root dir of the codebase, then execute:
$ make start
Fee oracle provides CLI.
For general help:$ sygma-fee-oracle -h
Start Sygma fee oracle main service
Usage:
sygma-fee-oracle server [flags]
Flags:
-c, --config_path string
-d, --domain_config_path string
-h, --help help for server
-t, --key_type string Support: secp256k1
-k, --keyfile_path string
-r, --resource_config_path string
Start Sygma fee oracle identity key generation
Usage:
sygma-fee-oracle key-generate [flags]
Flags:
-h, --help help for key-generate
-t, --key_type string Support: secp256k1 (default "secp256k1")
-k, --keyfile_path string Output dir for generated key file, filename is required with .priv as file extension (default "keyfile.priv")
$ make test
$ make check
$ make lint
Fee oracle provides a Dockerfile to containerize the codebase. To build docker image:
$ docker build -t fee_oracle .
To run docker container:
$ docker run -p 8091:8091 -it fee_oracle
8091 will be the exposed part for the endpoint access.
Note: fee oracle requires a private key file when starting, this key file must be a secp256k1 type and named as keyfile.priv and put in the ./ dir of the codebase when building docker image,
if no keyfile exists in ./ dir, fee oracle will auto generate a secp256k1 keyfile to use.
This will start fee oracle service, ganache-cli locally, install solcjs, abigen and generate contract go binding code, deploy fee handler contracts to local ganache.
$ make e2e-test
APP_MODE=release // app mode: debug or release. app mode is used for internal testing only.
IDENTITY_KEY= // fee oracle prikey in hex, without 0x prefix
IDENTITY_KEY_TYPE=secp256k1 // fee oracle prikey type, only support secp256k1 for now
WORKING_ENV=production // fee oracle app running mode: dev or production
LOG_LEVEL=4 // log level, 4 is info, 5 is debug, using 4 on production
HTTP_SERVER_MODE=release // fee oracle http server running mode: debug or release
HTTP_SERVER_PORT=8091 // fee oracle http server exposed port
CONVERSION_RATE_JOB_FREQUENCY="* * * * *" // conversion rate job frequency, using cron schedule expressions(https://crontab.guru)
GAS_PRICE_JOB_FREQUENCY="* * * * *" // gas price job frequency, using cron schedule expressions(https://crontab.guru)
ETHERSCAN_API_KEY= // api key of etherscan
POLYGONSCAN_API_KEY= // api key of polygonscan
COINMARKETCAP_API_KEY= // api key of coinmarketcap
MOONSCAN_API_KEY= // api key of moonscan
DATA_VALID_INTERVAL=3600 // Time of valid fee oracle response data in seconds
CONVERSION_RATE_PAIRS=eth,usdt,matic,usdt // conversion rate pairs that enabled for price fetching. Must be paired
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