Feature/add trustee rpc (paritytech#278)

* Sketch trustee rpc

* Fill TrusteeInfo struct

* Finish trustee rpc

rpc/Cargo.toml

@@ -9,6 +9,7 @@ jsonrpc-core = "10.0.1"
 jsonrpc-pubsub = "10.0.1"
 jsonrpc-derive = "10.0.1"
 log = "0.4"
+hex = "0.3.2"
 parking_lot = "0.4"
 parity-codec = "3.0"
 serde = "1.0"

rpc/src/chainx/impl_rpc.rs

@@ -426,6 +426,28 @@ where
         Ok(Some(psedu_intentions))
     }
 
+    fn trustee_info(&self, who: AccountId) -> Result<Vec<TrusteeInfo>> {
+        let state = self.best_state()?;
+        let mut trustee_info = Vec::new();
+
+        for chain in Chain::iterator() {
+            let key = <xaccounts::TrusteeIntentionPropertiesOf<Runtime>>::key_for(&(who, *chain));
+
+            if let Some(props) = Self::pickout::<TrusteeIntentionProps>(&state, &key)? {
+                let hot_entity = match props.hot_entity {
+                    TrusteeEntity::Bitcoin(pubkey) => hex::encode(&pubkey),
+                };
+                let cold_entity = match props.cold_entity {
+                    TrusteeEntity::Bitcoin(pubkey) => hex::encode(&pubkey),
+                };
+
+                trustee_info.push(TrusteeInfo::new(chain.clone(), hot_entity, cold_entity))
+            }
+        }
+
+        Ok(trustee_info)
+    }
+
     fn psedu_nomination_records(
         &self,
         who: AccountId,

rpc/src/chainx/mod.rs

@@ -22,7 +22,7 @@ use chainx_primitives::{AccountId, Balance, BlockNumber, Timestamp};
 use chainx_runtime::Runtime;
 use xr_primitives::generic::b58;
 
-use xaccounts::{self, IntentionProps};
+use xaccounts::{self, IntentionProps, TrusteeEntity, TrusteeIntentionProps};
 use xassets::{self, Asset, AssetType, Chain, Token};
 use xbitcoin::{
     self, BestIndex, BlockHeaderFor, BlockHeaderInfo, CandidateTx, IrrBlock, TxFor, TxInfo,
@@ -44,8 +44,8 @@ pub mod types;
 use self::error::Result;
 use self::types::{
     AssetInfo, DepositInfo, IntentionInfo, NominationRecord, PageData, PairInfo,
-    PseduIntentionInfo, PseduNominationRecord, QuotationsList, TotalAssetInfo, WithdrawInfo,
-    WithdrawStatus,
+    PseduIntentionInfo, PseduNominationRecord, QuotationsList, TotalAssetInfo, TrusteeInfo,
+    WithdrawInfo, WithdrawStatus,
 };
 use chainx::error::ErrorKind::*;
 const MAX_PAGE_SIZE: u32 = 100;
@@ -98,6 +98,9 @@ pub trait ChainXApi<Number, AccountId, Balance, BlockNumber, SignedBlock> {
 
     #[rpc(name = "chainx_getAddressByAccount")]
     fn address(&self, AccountId, Chain) -> Result<Option<Vec<String>>>;
+
+    #[rpc(name = "chainx_getTrusteeInfoByAccount")]
+    fn trustee_info(&self, AccountId) -> Result<Vec<TrusteeInfo>>;
 }
 
 /// ChainX API

rpc/src/chainx/types.rs

@@ -95,6 +95,24 @@ pub struct IntentionInfo {
     pub last_total_vote_weight_update: BlockNumber,
 }
 
+#[derive(Debug, Default, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct TrusteeInfo {
+    chain: Chain,
+    hot_entity: String,
+    cold_entity: String,
+}
+
+impl TrusteeInfo {
+    pub fn new(chain: Chain, hot_entity: String, cold_entity: String) -> Self {
+        TrusteeInfo {
+            chain,
+            hot_entity,
+            cold_entity,
+        }
+    }
+}
+
 /// OrderPair info
 #[derive(Debug, Default, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]

rpc/src/lib.rs

@@ -18,6 +18,7 @@
 extern crate chain as btc_chain;
 extern crate chainx_primitives;
 extern crate chainx_runtime;
+extern crate hex;
 extern crate jsonrpc_core as rpc;
 extern crate jsonrpc_derive;
 extern crate jsonrpc_pubsub;