[REST] add JSON support for /rest/headers/

doc/REST-interface.md

@@ -26,13 +26,11 @@ The HTTP request and response are both handled entirely in-memory, thus making m
 With the /notxdetails/ option JSON response will only contain the transaction hash instead of the complete transaction details. The option only affects the JSON response.
 
 ####Blockheaders
-`GET /rest/headers/<COUNT>/<BLOCK-HASH>.<bin|hex>`
+`GET /rest/headers/<COUNT>/<BLOCK-HASH>.<bin|hex|json>`
 
 Given a block hash,
 Returns <COUNT> amount of blockheaders in upward direction.
 
-JSON is not supported.
-
 ####Chaininfos
 `GET /rest/chaininfo.json`
 

qa/rpc-tests/rest.py

@@ -235,12 +235,43 @@ class RESTTest (BitcoinTestFramework):
         assert_equal(response_header_str.encode("hex")[0:160], response_header_hex_str[0:160])
 
         # check json format
-        json_string = http_get_call(url.hostname, url.port, '/rest/block/'+bb_hash+self.FORMAT_SEPARATOR+'json')
-        json_obj = json.loads(json_string)
-        assert_equal(json_obj['hash'], bb_hash)
+        block_json_string = http_get_call(url.hostname, url.port, '/rest/block/'+bb_hash+self.FORMAT_SEPARATOR+'json')
+        block_json_obj = json.loads(block_json_string)
+        assert_equal(block_json_obj['hash'], bb_hash)
+
+        # compare with json block header
+        response_header_json = http_get_call(url.hostname, url.port, '/rest/headers/1/'+bb_hash+self.FORMAT_SEPARATOR+"json", "", True)
+        assert_equal(response_header_json.status, 200)
+        response_header_json_str = response_header_json.read()
+        json_obj = json.loads(response_header_json_str)
+        assert_equal(len(json_obj), 1) #ensure that there is one header in the json response
+        assert_equal(json_obj[0]['hash'], bb_hash) #request/response hash should be the same
+
+        #compare with normal RPC block response
+        rpc_block_json = self.nodes[0].getblock(bb_hash)
+        assert_equal(json_obj[0]['hash'],               rpc_block_json['hash'])
+        assert_equal(json_obj[0]['confirmations'],      rpc_block_json['confirmations'])
+        assert_equal(json_obj[0]['height'],             rpc_block_json['height'])
+        assert_equal(json_obj[0]['version'],            rpc_block_json['version'])
+        assert_equal(json_obj[0]['merkleroot'],         rpc_block_json['merkleroot'])
+        assert_equal(json_obj[0]['time'],               rpc_block_json['time'])
+        assert_equal(json_obj[0]['nonce'],              rpc_block_json['nonce'])
+        assert_equal(json_obj[0]['bits'],               rpc_block_json['bits'])
+        assert_equal(json_obj[0]['difficulty'],         rpc_block_json['difficulty'])
+        assert_equal(json_obj[0]['chainwork'],          rpc_block_json['chainwork'])
+        assert_equal(json_obj[0]['previousblockhash'],  rpc_block_json['previousblockhash'])
+
+        #see if we can get 5 headers in one response
+        self.nodes[1].generate(5)
+        self.sync_all()
+        response_header_json = http_get_call(url.hostname, url.port, '/rest/headers/5/'+bb_hash+self.FORMAT_SEPARATOR+"json", "", True)
+        assert_equal(response_header_json.status, 200)
+        response_header_json_str = response_header_json.read()
+        json_obj = json.loads(response_header_json_str)
+        assert_equal(len(json_obj), 5) #now we should have 5 header objects
 
         # do tx test
-        tx_hash = json_obj['tx'][0]['txid'];
+        tx_hash = block_json_obj['tx'][0]['txid'];
         json_string = http_get_call(url.hostname, url.port, '/rest/tx/'+tx_hash+self.FORMAT_SEPARATOR+"json")
         json_obj = json.loads(json_string)
         assert_equal(json_obj['txid'], tx_hash)

src/rest.cpp

@@ -65,6 +65,7 @@ public:
 extern void TxToJSON(const CTransaction& tx, const uint256 hashBlock, UniValue& entry);
 extern UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool txDetails = false);
 extern void ScriptPubKeyToJSON(const CScript& scriptPubKey, UniValue& out, bool fIncludeHex);
+extern UniValue blockheaderToJSON(const CBlockIndex* blockindex);
 
 static RestErr RESTERR(enum HTTPStatusCode status, string message)
 {
@@ -134,14 +135,14 @@ static bool rest_headers(AcceptedConnection* conn,
     if (!ParseHashStr(hashStr, hash))
         throw RESTERR(HTTP_BAD_REQUEST, "Invalid hash: " + hashStr);
 
-    std::vector<CBlockHeader> headers;
+    std::vector<const CBlockIndex *> headers;
     headers.reserve(count);
     {
         LOCK(cs_main);
         BlockMap::const_iterator it = mapBlockIndex.find(hash);
         const CBlockIndex *pindex = (it != mapBlockIndex.end()) ? it->second : NULL;
         while (pindex != NULL && chainActive.Contains(pindex)) {
-            headers.push_back(pindex->GetBlockHeader());
+            headers.push_back(pindex);
             if (headers.size() == (unsigned long)count)
                 break;
             pindex = chainActive.Next(pindex);
@@ -149,8 +150,8 @@ static bool rest_headers(AcceptedConnection* conn,
     }
 
     CDataStream ssHeader(SER_NETWORK, PROTOCOL_VERSION);
-    BOOST_FOREACH(const CBlockHeader &header, headers) {
-        ssHeader << header;
+    BOOST_FOREACH(const CBlockIndex *pindex, headers) {
+        ssHeader << pindex->GetBlockHeader();
     }
 
     switch (rf) {
@@ -166,6 +167,16 @@ static bool rest_headers(AcceptedConnection* conn,
         return true;
     }
 
+    case RF_JSON: {
+        UniValue jsonHeaders(UniValue::VARR);
+        BOOST_FOREACH(const CBlockIndex *pindex, headers) {
+            jsonHeaders.push_back(blockheaderToJSON(pindex));
+        }
+        string strJSON = jsonHeaders.write() + "\n";
+        conn->stream() << HTTPReply(HTTP_OK, strJSON, fRun) << std::flush;
+        return true;
+    }
+
     default: {
         throw RESTERR(HTTP_NOT_FOUND, "output format not found (available: .bin, .hex)");
     }

src/rpcblockchain.cpp

@@ -77,7 +77,6 @@ UniValue blockheaderToJSON(const CBlockIndex* blockindex)
     return result;
 }
 
-
 UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool txDetails = false)
 {
     UniValue result(UniValue::VOBJ);
@@ -118,7 +117,6 @@ UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool tx
     return result;
 }
 
-
 UniValue getblockcount(const UniValue& params, bool fHelp)
 {
     if (fHelp || params.size() != 0)