Implement BlockSource for REST and RPC clients

[rust-lightning] / lightning-block-sync / src / rest.rs

diff --git a/lightning-block-sync/src/rest.rs b/lightning-block-sync/src/rest.rs
index 3ccd5d482e48290e46007ebf16379a87aceeecc9..3c2e76e23d7d5ee2eebd4a957185a34fef629583 100644 (file)
--- a/lightning-block-sync/src/rest.rs
+++ b/lightning-block-sync/src/rest.rs
@@ -1,4 +1,9 @@
-use crate::http::{HttpEndpoint, HttpClient};
+use crate::{BlockHeaderData, BlockSource, AsyncBlockSourceResult};
+use crate::http::{BinaryResponse, HttpEndpoint, HttpClient, JsonResponse};
+
+use bitcoin::blockdata::block::Block;
+use bitcoin::hash_types::BlockHash;
+use bitcoin::hashes::hex::ToHex;
 
 use std::convert::TryFrom;
 use std::convert::TryInto;
@@ -11,6 +16,8 @@ pub struct RestClient {
 
 impl RestClient {
        /// Creates a new REST client connected to the given endpoint.
+       ///
+       /// The endpoint should contain the REST path component (e.g., http://127.0.0.1:8332/rest).
        pub fn new(endpoint: HttpEndpoint) -> std::io::Result<Self> {
                let client = HttpClient::connect(&endpoint)?;
                Ok(Self { endpoint, client })
@@ -25,6 +32,28 @@ impl RestClient {
        }
 }
 
+impl BlockSource for RestClient {
+       fn get_header<'a>(&'a mut self, header_hash: &'a BlockHash, _height: Option<u32>) -> AsyncBlockSourceResult<'a, BlockHeaderData> {
+               Box::pin(async move {
+                       let resource_path = format!("headers/1/{}.json", header_hash.to_hex());
+                       Ok(self.request_resource::<JsonResponse, _>(&resource_path).await?)
+               })
+       }
+
+       fn get_block<'a>(&'a mut self, header_hash: &'a BlockHash) -> AsyncBlockSourceResult<'a, Block> {
+               Box::pin(async move {
+                       let resource_path = format!("block/{}.bin", header_hash.to_hex());
+                       Ok(self.request_resource::<BinaryResponse, _>(&resource_path).await?)
+               })
+       }
+
+       fn get_best_block<'a>(&'a mut self) -> AsyncBlockSourceResult<'a, (BlockHash, Option<u32>)> {
+               Box::pin(async move {
+                       Ok(self.request_resource::<JsonResponse, _>("chaininfo.json").await?)
+               })
+       }
+}
+
 #[cfg(test)]
 mod tests {
        use super::*;