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use core::convert::{TryFrom, TryInto};
use jsonrpc_core::{
id::Id,
params::Params,
request::{Call, MethodCall, Notification, Request},
response::{Failure, Output, Response, Success},
types::to_string,
version::Version,
Value,
};
use log::trace;
use crate::{Error, Result};
pub struct CommonPart {
pub jsonrpc: Option<Version>,
pub id_opt: Option<Id>,
}
impl Default for CommonPart {
fn default() -> Self {
Self::num(0)
}
}
impl CommonPart {
pub fn num(n: u64) -> Self {
Self {
jsonrpc: Some(Version::V2),
id_opt: Some(Id::Num(n)),
}
}
pub fn str(s: String) -> Self {
Self {
jsonrpc: Some(Version::V2),
id_opt: Some(Id::Str(s)),
}
}
}
pub trait JsonRpcRequest
where
Self: TryInto<Params> + Sized,
{
type Output: TryFrom<Value>;
fn method() -> &'static str;
fn to_string(self, c: CommonPart) -> Result<String> {
self.to_single_request(c).and_then(|sc| {
to_string(&sc).map_err(|_| Error::serde("failed to convert a single request to string"))
})
}
fn to_single_request(self, c: CommonPart) -> Result<Request> {
self.to_call(c).map(Request::Single)
}
fn to_call(self, c: CommonPart) -> Result<Call> {
let CommonPart { jsonrpc, id_opt } = c;
let method = Self::method().to_owned();
self.try_into()
.map_err(|_| Error::serde("failed to parse a request core"))
.map(|params: Params| {
if let Some(id) = id_opt {
Call::MethodCall(MethodCall {
jsonrpc,
method,
params,
id,
})
} else {
Call::Notification(Notification {
jsonrpc,
method,
params,
})
}
})
}
fn parse_single_response(response: Response) -> Result<Self::Output> {
match response {
Response::Single(output) => match output {
Output::Success(success) => {
let Success {
jsonrpc,
result,
id,
} = success;
trace!("Success {{ jsonrpc: {:#?}, id: {:#?} }}", jsonrpc, id);
result
.try_into()
.map_err(|_| Error::custom("failed to parse the result"))
}
Output::Failure(failure) => {
let Failure { jsonrpc, error, id } = failure;
trace!("Failure {{ jsonrpc: {:#?}, id: {:#?} }}", jsonrpc, id);
Err(error.into())
}
},
Response::Batch(_) => Err(Error::custom("could not be a batch response")),
}
}
}