tendermint-rs: /abci_query RPC endpoint (closes #287)

Adds support for invoking the ABCIQuery endpoint:

https://tendermint.com/rpc/#abciquery

Cargo.toml

@@ -47,7 +47,7 @@ yubihsm = { version = "0.26", features = ["setup", "usb"], optional = true }
 zeroize = "0.9"
 
 [dependencies.abscissa_core]
-version = "0.2.0"
+version = "0.2"
 
 [dependencies.tendermint]
 version = "0.9"
@@ -59,7 +59,7 @@ tempfile = "3"
 rand = "0.6"
 
 [dev-dependencies.abscissa_core]
-version = "0.2.0"
+version = "0.2"
 features = ["testing"]
 
 [features]

tendermint-rs/src/abci.rs

@@ -18,11 +18,15 @@ mod info;
 #[cfg(feature = "rpc")]
 mod log;
 #[cfg(feature = "rpc")]
+mod path;
+#[cfg(feature = "rpc")]
+mod proof;
+#[cfg(feature = "rpc")]
 mod responses;
 pub mod transaction;
 
 #[cfg(feature = "rpc")]
 pub use self::{
-    code::Code, data::Data, gas::Gas, info::Info, log::Log, responses::Responses,
+    code::Code, data::Data, gas::Gas, info::Info, log::Log, proof::Proof, responses::Responses,
     transaction::Transaction,
 };

tendermint-rs/src/abci/path.rs

@@ -0,0 +1 @@
+

tendermint-rs/src/abci/proof.rs

@@ -0,0 +1,51 @@
+//! ABCI Merkle proofs
+
+use crate::error::Error;
+use serde::{de::Error as _, Deserialize, Deserializer, Serialize, Serializer};
+use std::{
+    fmt::{self, Display},
+    str::FromStr,
+};
+use subtle_encoding::{Encoding, Hex};
+
+/// ABCI Merkle proofs
+#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+pub struct Proof(Vec<u8>);
+
+impl AsRef<[u8]> for Proof {
+    fn as_ref(&self) -> &[u8] {
+        self.0.as_ref()
+    }
+}
+
+impl Display for Proof {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "{}",
+            &Hex::upper_case().encode_to_string(&self.0).unwrap()
+        )
+    }
+}
+
+impl FromStr for Proof {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self, Error> {
+        let bytes = Hex::upper_case().decode(s)?;
+        Ok(Proof(bytes))
+    }
+}
+
+impl<'de> Deserialize<'de> for Proof {
+    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
+        let hex = String::deserialize(deserializer)?;
+        Ok(Self::from_str(&hex).map_err(|e| D::Error::custom(format!("{}", e)))?)
+    }
+}
+
+impl Serialize for Proof {
+    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        self.to_string().serialize(serializer)
+    }
+}

tendermint-rs/src/block/height.rs

@@ -9,7 +9,7 @@ use std::{
 /// Block height for a particular chain (i.e. number of blocks created since
 /// the chain began)
 #[derive(Copy, Clone, Eq, Hash, PartialEq, PartialOrd, Ord)]
-pub struct Height(pub u64);
+pub struct Height(u64);
 
 impl Height {
     /// Convert `u64` to block height.

tendermint-rs/src/rpc/client.rs

@@ -1,7 +1,7 @@
 //! Tendermint RPC client
 
 use crate::{
-    abci::Transaction,
+    abci::{self, Transaction},
     block::Height,
     net,
     rpc::{self, endpoint::*, Error, Response},
@@ -33,6 +33,22 @@ impl Client {
         Ok(self.perform(abci_info::Request)?.response)
     }
 
+    /// `/abci_query`: query the ABCI application
+    pub fn abci_query(
+        &self,
+        path: Option<abci::Path>,
+        data: D,
+        height: Option<block::Height>,
+        prove: bool,
+    ) -> Result<abci_query::AbciQuery, Error>
+    where
+        D: AsRef<[u8]>,
+    {
+        Ok(self
+            .perform(abci_query::Request::new(path, data, height, prove))?
+            .response)
+    }
+
     /// `/block`: get block at a given height.
     pub fn block<H>(&self, height: H) -> Result<block::Response, Error>
     where

tendermint-rs/src/rpc/endpoint.rs

@@ -1,6 +1,7 @@
 //! Tendermint JSONRPC endpoints
 
 pub mod abci_info;
+pub mod abci_query;
 pub mod block;
 pub mod block_results;
 pub mod blockchain;

tendermint-rs/src/rpc/endpoint/abci_query.rs

@@ -0,0 +1,80 @@
+//! `/abci_query` endpoint JSONRPC wrapper
+
+use crate::{
+    abci::{Code, Log, Proof},
+    block, rpc, serializers,
+};
+use serde::{Deserialize, Serialize};
+
+/// Query the ABCI application for information
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+pub struct Request {
+    /// Path to the data
+    path: Option<String>,
+
+    /// Data to query
+    data: Vec<u8>,
+
+    /// Block height
+    height: Option<block::Height>,
+
+    /// Include proof in response
+    prove: bool,
+}
+
+impl rpc::Request for Request {
+    type Response = Response;
+
+    fn method(&self) -> rpc::Method {
+        rpc::Method::AbciInfo
+    }
+}
+
+/// ABCI query response wrapper
+#[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct Response {
+    /// ABCI query results
+    pub response: AbciQuery,
+}
+
+impl rpc::Response for Response {}
+
+/// ABCI query results
+#[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct AbciQuery {
+    /// Response code
+    pub code: Code,
+
+    /// Log value
+    pub log: Log,
+
+    /// Info value
+    pub info: Option<String>,
+
+    /// Index
+    #[cfg_attr(
+        feature = "serde",
+        serde(
+            serialize_with = "serializers::serialize_i64",
+            deserialize_with = "serializers::parse_i64"
+        )
+    )]
+    pub index: i64,
+
+    /// Key
+    // TODO(tarcieri): parse to Vec<u8>?
+    pub key: String,
+
+    /// Value
+    // TODO(tarcieri): parse to Vec<u8>?
+    pub value: String,
+
+    /// Proof (if requested)
+    pub proof: Option<Proof>,
+
+    /// Block height
+    pub height: block::Height,
+
+    /// Codespace
+    pub codespace: Option<String>,
+}

tendermint-rs/tests/rpc.rs

@@ -23,6 +23,15 @@ mod endpoints {
         assert_eq!(response.last_block_height.value(), 488120);
     }
 
+    #[test]
+    fn abci_query() {
+        let response = endpoint::abci_query::Response::from_json(&read_json_fixture("abci_query"))
+            .unwrap()
+            .response;
+
+        assert_eq!(response.height.value(), 1);
+    }
+
     #[test]
     fn block() {
         let response = endpoint::block::Response::from_json(&read_json_fixture("block")).unwrap();

tendermint-rs/tests/support/rpc/abci_query.json

@@ -0,0 +1,15 @@
+{
+    "jsonrpc": "2.0",
+    "id": "",
+    "result": {
+        "response": {
+            "log": "exists",
+            "height": "1",
+            "proof": "010114FED0DAD959F36091AD761C922ABA3CBF1D8349990101020103011406AA2262E2F448242DF2C2607C3CDC705313EE3B0001149D16177BC71E445476174622EA559715C293740C",
+            "value": "61626364",
+            "key": "61626364",
+            "index": "-1",
+            "code": "0"
+        }
+    }
+}