casper-node 0.1.0

The Casper blockchain node
Documentation 
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//! The set of JSON-RPCs which the API server handles.
//!
//! See https://github.com/CasperLabs/ceps/blob/master/text/0009-client-api.md#rpcs for info.

pub mod account;
pub mod chain;
pub mod info;
pub mod state;

use std::str;

use futures::{future::BoxFuture, TryFutureExt};
use http::Response;
use hyper::Body;
use serde::{Deserialize, Serialize};
use warp::{
    filters::BoxedFilter,
    reject::{self, Reject},
    Filter,
};
use warp_json_rpc::{filters, Builder};

use super::{ApiRequest, ReactorEventT};
use crate::effect::EffectBuilder;

/// The URL path.
pub const RPC_API_PATH: &str = "rpc";

/// Error code returned if the JSON-RPC response indicates failure.
///
/// See https://www.jsonrpc.org/specification#error_object for details.
#[repr(i64)]
enum ErrorCode {
    NoSuchDeploy = 32000,
    NoSuchBlock = 32001,
    ParseQueryKey = 32002,
    QueryFailed = 32003,
    QueryFailedToExecute = 32004,
    ParseGetBalanceURef = 32005,
    GetBalanceFailed = 32006,
    GetBalanceFailedToExecute = 32007,
}

#[derive(Debug)]
pub(super) struct Error(String);

impl Reject for Error {}

impl From<anyhow::Error> for Error {
    fn from(error: anyhow::Error) -> Self {
        Error(error.to_string())
    }
}

/// A JSON-RPC requiring the "params" field to be present.
pub trait RpcWithParams {
    /// The JSON-RPC "method" name.
    const METHOD: &'static str;

    /// The JSON-RPC request's "params" type.
    type RequestParams: Serialize + for<'de> Deserialize<'de> + Send + 'static;

    /// The JSON-RPC response's "result" type.
    type ResponseResult: Serialize + for<'de> Deserialize<'de> + Send + 'static;
}

/// A trait for creating a JSON-RPC filter where the request is required to have "params".
pub(super) trait RpcWithParamsExt: RpcWithParams {
    /// Creates the warp filter for this particular RPC.
    fn create_filter<REv: ReactorEventT>(
        effect_builder: EffectBuilder<REv>,
    ) -> BoxedFilter<(Response<Body>,)> {
        warp::path(RPC_API_PATH)
            .and(filters::json_rpc())
            .and(filters::method(Self::METHOD))
            .and(filters::params::<Self::RequestParams>())
            .and_then(
                move |response_builder: Builder, params: Self::RequestParams| {
                    Self::handle_request(effect_builder, response_builder, params)
                        .map_err(reject::custom)
                },
            )
            .boxed()
    }

    /// Handles the incoming RPC request.
    fn handle_request<REv: ReactorEventT>(
        effect_builder: EffectBuilder<REv>,
        response_builder: Builder,
        params: Self::RequestParams,
    ) -> BoxFuture<'static, Result<Response<Body>, Error>>;
}

/// A JSON-RPC requiring the "params" field to be absent.
pub trait RpcWithoutParams {
    /// The JSON-RPC "method" name.
    const METHOD: &'static str;

    /// The JSON-RPC response's "result" type.
    type ResponseResult: Serialize + for<'de> Deserialize<'de> + Send + 'static;
}

/// A trait for creating a JSON-RPC filter where the request is not required to have "params".
pub(super) trait RpcWithoutParamsExt: RpcWithoutParams {
    /// Creates the warp filter for this particular RPC.
    fn create_filter<REv: ReactorEventT>(
        effect_builder: EffectBuilder<REv>,
    ) -> BoxedFilter<(Response<Body>,)> {
        warp::path(RPC_API_PATH)
            .and(filters::json_rpc())
            .and(filters::method(Self::METHOD))
            .and_then(move |response_builder: Builder| {
                Self::handle_request(effect_builder, response_builder).map_err(reject::custom)
            })
            .boxed()
    }

    /// Handles the incoming RPC request.
    fn handle_request<REv: ReactorEventT>(
        effect_builder: EffectBuilder<REv>,
        response_builder: Builder,
    ) -> BoxFuture<'static, Result<Response<Body>, Error>>;
}

/// A JSON-RPC with the "params" field optional.
pub trait RpcWithOptionalParams {
    /// The JSON-RPC "method" name.
    const METHOD: &'static str;

    /// The JSON-RPC request's "params" type.  This will be passed to the handler wrapped in an
    /// `Option`.
    type OptionalRequestParams: Serialize + for<'de> Deserialize<'de> + Send + 'static;

    /// The JSON-RPC response's "result" type.
    type ResponseResult: Serialize + for<'de> Deserialize<'de> + Send + 'static;
}

/// A trait for creating a JSON-RPC filter where the request may optionally have "params".
pub(super) trait RpcWithOptionalParamsExt: RpcWithOptionalParams {
    /// Creates the warp filter for this particular RPC.
    fn create_filter<REv: ReactorEventT>(
        effect_builder: EffectBuilder<REv>,
    ) -> BoxedFilter<(Response<Body>,)> {
        let with_params = warp::path(RPC_API_PATH)
            .and(filters::json_rpc())
            .and(filters::method(Self::METHOD))
            .and(filters::params::<Self::OptionalRequestParams>())
            .and_then(
                move |response_builder: Builder, params: Self::OptionalRequestParams| {
                    Self::handle_request(effect_builder, response_builder, Some(params))
                        .map_err(reject::custom)
                },
            );
        let without_params = warp::path(RPC_API_PATH)
            .and(filters::json_rpc())
            .and(filters::method(Self::METHOD))
            .and_then(move |response_builder: Builder| {
                Self::handle_request(effect_builder, response_builder, None).map_err(reject::custom)
            });
        with_params.or(without_params).unify().boxed()
    }

    /// Handles the incoming RPC request.
    fn handle_request<REv: ReactorEventT>(
        effect_builder: EffectBuilder<REv>,
        response_builder: Builder,
        maybe_params: Option<Self::OptionalRequestParams>,
    ) -> BoxFuture<'static, Result<Response<Body>, Error>>;
}