Add getAccount JSON RPC request

doc/json-rpc.md

@@ -8,7 +8,7 @@ To interact with a Solana node inside a JavaScript application, use the [solana-
 RPC Endpoint
 ---
 
-**Default port:** 8899  
+**Default port:** 8899
 eg. http://localhost:8899, http://192.168.1.88:8899
 
 Methods
@@ -17,6 +17,7 @@ Methods
 * [confirmTransaction](#confirmtransaction)
 * [getAddress](#getaddress)
 * [getBalance](#getbalance)
+* [getAccount](#getaccount)
 * [getLastId](#getlastid)
 * [getTransactionCount](#gettransactioncount)
 * [requestAirdrop](#requestairdrop)
@@ -96,6 +97,30 @@ curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0", "id":1, "
 
 ---
 
+### getAccount
+Returns all information associated with the account of provided Pubkey
+
+##### Parameters:
+* `string` - Pubkey of account to query, as base-58 encoded string
+
+##### Results:
+The result field will be a JSON object with the following sub fields:
+
+* `tokens`, number of tokens assigned to this account, as a signed 64-bit integer
+* `contract_id`, array of 32 bytes representing the program this account has been assigned to
+* `userdata`, array of bytes representing any userdata associated with the account
+
+##### Example:
+```bash
+// Request
+curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0", "id":1, "method":"getAccount", "params":["FVxxngPx368XvMCoeskdd6U8cZJFsfa1BEtGWqyAxRj4"]}' http://localhost:8899
+
+// Result
+{"jsonrpc":"2.0","result":{"contract_id":[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"tokens":1,"userdata":[3,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,20,0,0,0,0,0,0,0,50,48,53,48,45,48,49,45,48,49,84,48,48,58,48,48,58,48,48,90,252,10,7,28,246,140,88,177,98,82,10,227,89,81,18,30,194,101,199,16,11,73,133,20,246,62,114,39,20,113,189,32,50,0,0,0,0,0,0,0,247,15,36,102,167,83,225,42,133,127,82,34,36,224,207,130,109,230,224,188,163,33,213,13,5,117,211,251,65,159,197,51,0,0,0,0,0,0]},"id":1}
+```
+
+---
+
 ### getLastId
 Returns the last entry ID from the ledger
 

src/rpc.rs

@@ -1,6 +1,6 @@
 //! The `rpc` module implements the Solana RPC interface.
 
-use bank::Bank;
+use bank::{Account, Bank};
 use bincode::deserialize;
 use bs58;
 use jsonrpc_core::*;
@@ -102,6 +102,9 @@ build_rpc_trait! {
         #[rpc(meta, name = "getTransactionCount")]
         fn get_transaction_count(&self, Self::Metadata) -> Result<u64>;
 
+        #[rpc(meta, name = "getAccount")]
+        fn get_account(&self, Self::Metadata, String) -> Result<Account>;
+
         #[rpc(meta, name= "requestAirdrop")]
         fn request_airdrop(&self, Self::Metadata, String, u64) -> Result<String>;
 
@@ -143,6 +146,16 @@ impl RpcSol for RpcSolImpl {
     fn get_transaction_count(&self, meta: Self::Metadata) -> Result<u64> {
         meta.request_processor.get_transaction_count()
     }
+    fn get_account(&self, meta: Self::Metadata, id: String) -> Result<Account> {
+        let pubkey_vec = bs58::decode(id)
+            .into_vec()
+            .map_err(|_| Error::invalid_request())?;
+        if pubkey_vec.len() != mem::size_of::<Pubkey>() {
+            return Err(Error::invalid_request());
+        }
+        let pubkey = Pubkey::new(&pubkey_vec);
+        meta.request_processor.get_account(pubkey)
+    }
     fn request_airdrop(&self, meta: Self::Metadata, id: String, tokens: u64) -> Result<String> {
         let pubkey_vec = bs58::decode(id)
             .into_vec()
@@ -212,6 +225,11 @@ impl JsonRpcRequestProcessor {
     fn get_transaction_count(&self) -> Result<u64> {
         Ok(self.bank.transaction_count() as u64)
     }
+    fn get_account(&self, pubkey: Pubkey) -> Result<Account> {
+        self.bank
+            .get_account(&pubkey)
+            .ok_or(Error::invalid_request())
+    }
 }
 
 #[cfg(test)]
@@ -270,6 +288,28 @@ mod tests {
         let result: Response = serde_json::from_str(&res.expect("actual response"))
             .expect("actual response deserialization");
         assert_eq!(expected, result);
+
+        let req = format!(
+            r#"{{"jsonrpc":"2.0","id":1,"method":"getAccount","params":["{}"]}}"#,
+            bob_pubkey
+        );
+
+        let res = io.handle_request_sync(&req, meta.clone());
+        let expected = r#"{
+            "jsonrpc":"2.0",
+            "result":{
+                "contract_id": [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+                "tokens": 20,
+                "userdata": []
+            },
+            "id":1}
+        "#;
+        let expected: Response =
+            serde_json::from_str(&expected).expect("expected response deserialization");
+
+        let result: Response = serde_json::from_str(&res.expect("actual response"))
+            .expect("actual response deserialization");
+        assert_eq!(expected, result);
     }
     #[test]
     fn test_rpc_request_bad_parameter_type() {