oracle implementation for bitcoin.
A working version of this oracle is hosted at https://oracle.lava.xyz/v1/announcements.
curl -X GET http://localhost:8080/v1/announcementsThis endpoint returns a JSON array of oracle event objects. Oracle event objects contain the following fields:
| name | type | description |
|---|---|---|
asset_pair |
AssetPair enum |
asset pair |
announcement |
String |
hex-encoded TLV of oracle_announcement |
attestation |
String or null |
hex-encoded TLV of oracle_attestation, if exists |
maturation |
String |
RFC3339-encoded time of maturation (attestation) |
outcome |
u64 or null |
outcome value, if exists |
Each oracle is associated with one AssetPair, e.g. BTCUSD. Currently, the defined asset pairs are
AssetPair |
|---|
BTCUSD |
To define more, see Asset Pairs.
Output example:
[
{
"announcement": "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",
"asset_pair": "BTCUSD",
"attestation": "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",
"maturation": "2022-05-31T08:00:00Z",
"outcome": 30236
}
]Query string parameters may be specified to filter requests and reorganize response data. Query parameters supported are:
| name | type | optional | default | description |
|---|---|---|---|---|
sortBy |
insertion or reverseInsertion |
yes | reverseInsertion |
sort order (reverseInsertion is most recent first) |
page |
u32 |
yes | 0 | page to start retrieval from (page size is 100) |
assetPair |
AssetPair enum |
yes | BTCUSD | asset pair |
Example:
curl -X GET http://localhost:8080/v1/announcements?sortBy=insertion&page=1curl -X GET http://localhost:8080/v1/announcement/{rfc3339_time}This endpoint returns an oracle event object with maturation rfc3339_time. This path parameter is a String that is the RFC3339-encoded time of maturation (attestation) for the oracle event, e.g. 2022-05-31T08:00:00Z. You can get this directly from the maturation field of the oracle event objects returned from listing announcements or make your own RFC3339-compliant string.
Output example:
{
"announcement": "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",
"asset_pair": "BTCUSD",
"attestation": "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",
"maturation": "2022-05-31T08:00:00Z",
"outcome": 30236
}Query parameters supported are:
| name | type | optional | default | description |
|---|---|---|---|---|
assetPair |
AssetPair enum |
yes | BTCUSD | asset pair |
Example:
curl -X GET http://localhost:8080/v1/announcement/2022-05-31T08:00:00Z?asset_pair=ETHUSDcurl -X GET http://localhost:8080/v1/configThis endpoint returns the oracle config.
Output example:
{
"announcement_offset": "7days 8h",
"attestation_time": "08:00",
"frequency": "1day"
}To run, first clone the repository and build:
git clone https://github.com/lava-xyz/sibyls.git
cargo build --releaseIf you don't already have a key, generate one with sibyls-keygen.
Then, you can run by executing:
./target/release/sibyls --key config/keystoreTo specify a file to read asset pair configs from (more on this in Asset Pairs), execute:
./target/release/sibyls -a <FILE>One is expected at config/asset_pair.json if not provided.
To specify a file to read oracle configs from (more on this in Configure), execute:
./target/release/sibyls -o <FILE>One is expected at config/oracle.json if not provided.
For help, execute:
./target/release/sibyls -hFor optional logging, you can run the above commands with the RUST_LOG environment variable set (see env_logger for more), for example:
RUST_LOG=INFO ./target/release/sibylsCurrently, the only logging done is at the INFO and DEBUG levels.
Asset pair configs will be discussed in Asset Pairs.
There are three configurable parameters for the oracle:
| name | type | description |
|---|---|---|
attestation_time |
([0-1][0-9]|2[0-3]):[0-5][0-9] |
time of attestation, in 24-hour format |
frequency |
(\d+(nsec|ns|usec|us|msec|ms|seconds|second|sec|s|minutes|minute|min|m|hours|hour|hr|h|days|day|d|weeks|week|w|months|month|M|years|year|y))+ |
frequency of attestation |
announcement_offset |
(\d+(nsec|ns|usec|us|msec|ms|seconds|second|sec|s|minutes|minute|min|m|hours|hour|hr|h|days|day|d|weeks|week|w|months|month|M|years|year|y))+ |
offset from attestation for announcement, e.g. with an offset of 5h announcements happen at attestation_time - 5h |
price_aggregation_type |
(avg|median) |
method for aggregating prices collected from pricefeeds |
The program defaults are located in config/oracle.json.
This oracle implementation is extensible to using other pricefeeds, asset pairs, and event descriptors rather than just BTC price feeds and digit decomposition.
Pricefeeds can be easily added as needed. In the future, they will have their own crate associated to their implementation, but for now they will reside here. To add a new pricefeed, say, Binance, you must implement the oracle::pricefeeds::PriceFeed trait. Note that you will have to implement translate_asset_pair for all possible variants of AssetPair, regardless of whether you use all of their announcements/attestations. Create binance.rs in the src/oracle/pricefeeds directory, implement it, and add the module binance in src/oracle/mod.rs and re-export it:
// snip
mod kraken;
mod binance; // <<
// snip
pub use kraken::Kraken;
pub use binance::Binance; // <<Available PriceFeedError variants are in src/oracle/pricefeeds/error.rs. Then, add a line initializing it in src/main.rs:
// snip
// pricefeed retreival
info!("creating pricefeeds for {}", asset_pair);
let pricefeeds: Vec<Box<dyn PriceFeed + Send + Sync>> = vec![
Box::new(Bitstamp {}),
Box::new(GateIo {}),
Box::new(Kraken {}),
Box::new(Binance {}), // <<
];
// snipAfter this, you are good to go!
Asset pairs may also be added, although it is a bit more involved. To add a new asset pair, say, ETHUSD, you must first add an entry in config/asset_pair.json, or whatever file you are using for asset pair config. There, you will add an AssetPairInfo object to the outermost array. AssetPairInfos contain the following fields:
| name | type | description |
|---|---|---|
asset_pair |
AssetPair enum |
asset pair |
event_descriptor |
event_descriptor |
event descriptor |
For now, the only event_descriptor supported is digit_decomposition_event_descriptor because that is the most immediate use case (for bitcoin). However, enum_event_descriptor will be added in the future. Furthermore, note that because of a quirk in the encodings of attestations due to inconsistencies between encoding libraries and DLC spec, currently event_descriptor.base must be 2 (binary) or else decoding will be incorrect. This will be changed in the future.
An example of a valid addition in config/asset_pair.json is the following:
[
{
"asset_pair": "ETHUSD",
"event_descriptor": {
"base": 2,
"is_signed": false,
"unit": "ETHUSD",
"precision": 0,
"num_digits": 14
}
},
]Then, you must add a variant to AssetPair in src/oracle/common.rs:
// snip
#[derive(Copy, Clone, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
pub enum AssetPair {
BTCUSD,
ETHUSD, // <<
}
// snipand finally add match arms to every pricefeed in their implementation of the trait method translate_asset_pair, for example:
// snip
impl PriceFeed for Kraken {
fn translate_asset_pair(&self, asset_pair: AssetPair) -> &'static str {
match asset_pair {
AssetPair::BTCUSD => "XXBTZUSD",
AssetPair::ETHUSD => "XETHZUSD", // <<
}
}
//snip
}Sibyls supports two backends for data persistence:
-
Sled - A modern, high-performance embedded database that offers a simple and efficient way to store and manage data locally.
-
PostgreSQL - A powerful, open-source relational database system that provides robust features and scalability for more complex data storage needs.
These options allow Sibyls to be flexible and adaptable, catering to the diverse needs of its users.
Sled is an embedded database that stores data on the local file system.
The Sibyls database backend stores data in events/{AssetPair} (eg. events/BTCUSD).
Sled is the default database, no additional configurations are needed to use it.
The user can also enable it explicitly by using the command line argument: --database_backend sled.
PostgreSQL is a full futured RDBMS, it can be used in enterprise settings.
To use PostgreSQL as the database, the user will need to use the command line argument --database_backend pg and --database_url postgres://user:password@database_host/database_name.
The DATABASE_URL environment variable can also be used to set the database URL.
The dual database backend is useful for transitioning from Sled to PostgreSQL.
If data is stored in PostgreSQL, it reads from the PostgreSQL backend.
If not, data is read from the Sled backend and added to the PostgreSQL backend.
To enable it, the user must include the --database_backend dual parameter
and set the database URL as it is done for PostgreSQL.
If you are running Sibyls, or want to run Sibyls and need help, please email us. You can find our contact info at lava.xyz.
The following todos are in decreasing priority.
Additional functionality can be added to make working with the key easier.
Encrypt the keystore on disk with a password. When Sibyls starts, require the password to decrypt the keystore.
Create a POST endpoint to inject a key into a running instance of Sibyls. This allows for the scenario where the sysadmin is separate from the key owner. The sysadmin is responsible for setting up Sibyls and the key owner is responsible for maintaining the key and running the curl command when Sibyls is up and running.
Currently, there are several data feeds supported out of the box. Additional feeds may be useful and added to src/oracle/pricefeeds.
The current implementation hosts both attestation signing and hosting in the same instance. It may be more secure to have them separated so that the signing can occur on a more secure instance that has write access to the database. The hosting instance could be more open/public.
Suggestions to documentation, testing, and logging are welcome.
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