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use std::sync::Arc;
use codec::{Codec, Decode};
use sp_blockchain::HeaderBackend;
use jsonrpc_core::{Error as RpcError, ErrorCode, Result};
use jsonrpc_derive::rpc;
use sp_runtime::{generic::BlockId, traits::{Block as BlockT, MaybeDisplay, MaybeFromStr}};
use sp_api::ProvideRuntimeApi;
use sp_core::Bytes;
use pallet_transaction_payment_rpc_runtime_api::RuntimeDispatchInfo;
pub use pallet_transaction_payment_rpc_runtime_api::TransactionPaymentApi as TransactionPaymentRuntimeApi;
pub use self::gen_client::Client as TransactionPaymentClient;
#[rpc]
pub trait TransactionPaymentApi<BlockHash, ResponseType> {
#[rpc(name = "payment_queryInfo")]
fn query_info(
&self,
encoded_xt: Bytes,
at: Option<BlockHash>
) -> Result<ResponseType>;
}
pub struct TransactionPayment<C, P> {
client: Arc<C>,
_marker: std::marker::PhantomData<P>,
}
impl<C, P> TransactionPayment<C, P> {
pub fn new(client: Arc<C>) -> Self {
TransactionPayment { client, _marker: Default::default() }
}
}
pub enum Error {
DecodeError,
RuntimeError,
}
impl From<Error> for i64 {
fn from(e: Error) -> i64 {
match e {
Error::RuntimeError => 1,
Error::DecodeError => 2,
}
}
}
impl<C, Block, Balance, Extrinsic> TransactionPaymentApi<<Block as BlockT>::Hash, RuntimeDispatchInfo<Balance>>
for TransactionPayment<C, (Block, Extrinsic)>
where
Block: BlockT,
C: Send + Sync + 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block>,
C::Api: TransactionPaymentRuntimeApi<Block, Balance, Extrinsic>,
Balance: Codec + MaybeDisplay + MaybeFromStr,
Extrinsic: Codec + Send + Sync + 'static,
{
fn query_info(
&self,
encoded_xt: Bytes,
at: Option<<Block as BlockT>::Hash>
) -> Result<RuntimeDispatchInfo<Balance>> {
let api = self.client.runtime_api();
let at = BlockId::hash(at.unwrap_or_else(||
self.client.info().best_hash
));
let encoded_len = encoded_xt.len() as u32;
let uxt: Extrinsic = Decode::decode(&mut &*encoded_xt).map_err(|e| RpcError {
code: ErrorCode::ServerError(Error::DecodeError.into()),
message: "Unable to query dispatch info.".into(),
data: Some(format!("{:?}", e).into()),
})?;
api.query_info(&at, uxt, encoded_len).map_err(|e| RpcError {
code: ErrorCode::ServerError(Error::RuntimeError.into()),
message: "Unable to query dispatch info.".into(),
data: Some(format!("{:?}", e).into()),
})
}
}