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use std::sync::Arc;
use codec::Codec;
use jsonrpc_core::{Error as RpcError, ErrorCode, Result};
use jsonrpc_derive::rpc;
use sp_api::ProvideRuntimeApi;
use sp_blockchain::HeaderBackend;
use sp_runtime::{generic::BlockId, traits::Block as BlockT};
pub use self::gen_client::Client as OracleClient;
pub use orml_oracle_rpc_runtime_api::OracleApi as OracleRuntimeApi;
#[rpc]
pub trait OracleApi<BlockHash, ProviderId, Key, Value> {
#[rpc(name = "oracle_getValue")]
fn get_value(&self, provider_id: ProviderId, key: Key, at: Option<BlockHash>) -> Result<Option<Value>>;
#[rpc(name = "oracle_getAllValues")]
fn get_all_values(&self, provider_id: ProviderId, at: Option<BlockHash>) -> Result<Vec<(Key, Option<Value>)>>;
}
pub struct Oracle<C, B> {
client: Arc<C>,
_marker: std::marker::PhantomData<B>,
}
impl<C, B> Oracle<C, B> {
pub fn new(client: Arc<C>) -> Self {
Oracle {
client,
_marker: Default::default(),
}
}
}
pub enum Error {
RuntimeError,
}
impl From<Error> for i64 {
fn from(e: Error) -> i64 {
match e {
Error::RuntimeError => 1,
}
}
}
impl<C, Block, ProviderId, Key, Value> OracleApi<<Block as BlockT>::Hash, ProviderId, Key, Value> for Oracle<C, Block>
where
Block: BlockT,
C: Send + Sync + 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block>,
C::Api: OracleRuntimeApi<Block, ProviderId, Key, Value>,
ProviderId: Codec,
Key: Codec,
Value: Codec,
{
fn get_value(
&self,
provider_id: ProviderId,
key: Key,
at: Option<<Block as BlockT>::Hash>,
) -> Result<Option<Value>> {
let api = self.client.runtime_api();
let at = BlockId::hash(at.unwrap_or(
self.client.info().best_hash,
));
api.get_value(&at, provider_id, key).map_err(|e| RpcError {
code: ErrorCode::ServerError(Error::RuntimeError.into()),
message: "Unable to get value.".into(),
data: Some(format!("{:?}", e).into()),
})
}
fn get_all_values(
&self,
provider_id: ProviderId,
at: Option<<Block as BlockT>::Hash>,
) -> Result<Vec<(Key, Option<Value>)>> {
let api = self.client.runtime_api();
let at = BlockId::hash(at.unwrap_or(
self.client.info().best_hash,
));
api.get_all_values(&at, provider_id).map_err(|e| RpcError {
code: ErrorCode::ServerError(Error::RuntimeError.into()),
message: "Unable to get all values.".into(),
data: Some(format!("{:?}", e).into()),
})
}
}