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rpc: Handle getinfo locally in bitcoin-cli w/ -getinfo

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This adds the infrastructure `BaseRequestHandler` class that takes care
of converting bitcoin-cli arguments into a JSON-RPC request object, and
converting the reply into a JSON object that can be shown as result.

This is subsequently used to handle the `-getinfo` option, which sends
a JSON-RPC batch request to the RPC server with
`["getnetworkinfo", "getblockchaininfo", "getwalletinfo"]`,
and after reply combines the result into what looks like a `getinfo`
result.

There have been some requests for a client-side `getinfo` and this
is my PoC of how to do it. If this is considered a good idea
some of the logic could be moved up to rpcclient.cpp and
used in the GUI console as well.

Extra-Author: Andrew Chow <achow101@gmail.com>
This commit is contained in:
Wladimir J. van der Laan 2016-09-29 16:45:19 +02:00 committed by Andrew Chow
parent ea729d55b4
commit 382625318d
3 changed files with 127 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

119
src/bitcoin-cli.cpp
View File

@ -37,6 +37,7 @@ std::string HelpMessageCli()
strUsage += HelpMessageOpt("-?", _("This help message"));
strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file (default: %s)"), BITCOIN_CONF_FILENAME));
strUsage += HelpMessageOpt("-datadir=<dir>", _("Specify data directory"));
strUsage += HelpMessageOpt("-getinfo", _("Get general information from the remote server. Note that unlike server-side RPC calls, the results of -getinfo is the result of multiple non-atomic requests. Some entries in the result may represent results from different states (e.g. wallet balance may be as of a different block from the chain state reported)"));
AppendParamsHelpMessages(strUsage);
strUsage += HelpMessageOpt("-named", strprintf(_("Pass named instead of positional arguments (default: %s)"), DEFAULT_NAMED));
strUsage += HelpMessageOpt("-rpcconnect=<ip>", strprintf(_("Send commands to node running on <ip> (default: %s)"), DEFAULT_RPCCONNECT));
@ -191,7 +192,96 @@ static void http_error_cb(enum evhttp_request_error err, void *ctx)
}
#endif
static UniValue CallRPC(const std::string& strMethod, const UniValue& params)
/** Class that handles the conversion from a command-line to a JSON-RPC request,
* as well as converting back to a JSON object that can be shown as result.
*/
class BaseRequestHandler
{
public:
virtual UniValue PrepareRequest(const std::string& method, const std::vector<std::string>& args) = 0;
virtual UniValue ProcessReply(const UniValue &batch_in) = 0;
};
/** Process getinfo requests */
class GetinfoRequestHandler: public BaseRequestHandler
{
public:
const int ID_NETWORKINFO = 0;
const int ID_BLOCKCHAININFO = 1;
const int ID_WALLETINFO = 2;
/** Create a simulated `getinfo` request. */
UniValue PrepareRequest(const std::string& method, const std::vector<std::string>& args) override
{
UniValue result(UniValue::VARR);
result.push_back(JSONRPCRequestObj("getnetworkinfo", NullUniValue, ID_NETWORKINFO));
result.push_back(JSONRPCRequestObj("getblockchaininfo", NullUniValue, ID_BLOCKCHAININFO));
result.push_back(JSONRPCRequestObj("getwalletinfo", NullUniValue, ID_WALLETINFO));
return result;
}
/** Collect values from the batch and form a simulated `getinfo` reply. */
UniValue ProcessReply(const UniValue &batch_in) override
{
UniValue result(UniValue::VOBJ);
std::vector<UniValue> batch = JSONRPCProcessBatchReply(batch_in, 3);
// Errors in getnetworkinfo() and getblockchaininfo() are fatal, pass them on
// getwalletinfo() is allowed to fail in case there is no wallet.
if (!batch[ID_NETWORKINFO]["error"].isNull()) {
return batch[ID_NETWORKINFO];
}
if (!batch[ID_BLOCKCHAININFO]["error"].isNull()) {
return batch[ID_BLOCKCHAININFO];
}
result.pushKV("version", batch[ID_NETWORKINFO]["result"]["version"]);
result.pushKV("protocolversion", batch[ID_NETWORKINFO]["result"]["protocolversion"]);
if (!batch[ID_WALLETINFO].isNull()) {
result.pushKV("walletversion", batch[ID_WALLETINFO]["result"]["walletversion"]);
result.pushKV("balance", batch[ID_WALLETINFO]["result"]["balance"]);
}
result.pushKV("blocks", batch[ID_BLOCKCHAININFO]["result"]["blocks"]);
result.pushKV("timeoffset", batch[ID_NETWORKINFO]["result"]["timeoffset"]);
result.pushKV("connections", batch[ID_NETWORKINFO]["result"]["connections"]);
result.pushKV("proxy", batch[ID_NETWORKINFO]["result"]["networks"][0]["proxy"]);
result.pushKV("difficulty", batch[ID_BLOCKCHAININFO]["result"]["difficulty"]);
result.pushKV("testnet", UniValue(batch[ID_BLOCKCHAININFO]["result"]["chain"].get_str() == "test"));
if (!batch[ID_WALLETINFO].isNull()) {
result.pushKV("walletversion", batch[ID_WALLETINFO]["result"]["walletversion"]);
result.pushKV("balance", batch[ID_WALLETINFO]["result"]["balance"]);
result.pushKV("keypoololdest", batch[ID_WALLETINFO]["result"]["keypoololdest"]);
result.pushKV("keypoolsize", batch[ID_WALLETINFO]["result"]["keypoolsize"]);
if (!batch[ID_WALLETINFO]["result"]["unlocked_until"].isNull()) {
result.pushKV("unlocked_until", batch[ID_WALLETINFO]["result"]["unlocked_until"]);
}
result.pushKV("paytxfee", batch[ID_WALLETINFO]["result"]["paytxfee"]);
}
result.pushKV("relayfee", batch[ID_NETWORKINFO]["result"]["relayfee"]);
result.pushKV("warnings", batch[ID_NETWORKINFO]["result"]["warnings"]);
return JSONRPCReplyObj(result, NullUniValue, 1);
}
};
/** Process default single requests */
class DefaultRequestHandler: public BaseRequestHandler {
public:
UniValue PrepareRequest(const std::string& method, const std::vector<std::string>& args) override
{
UniValue params;
if(gArgs.GetBoolArg("-named", DEFAULT_NAMED)) {
params = RPCConvertNamedValues(method, args);
} else {
params = RPCConvertValues(method, args);
}
return JSONRPCRequestObj(method, params, 1);
}
UniValue ProcessReply(const UniValue &reply) override
{
return reply.get_obj();
}
};
static UniValue CallRPC(BaseRequestHandler *rh, const std::string& strMethod, const std::vector<std::string>& args)
{
std::string host;
// In preference order, we choose the following for the port:
@ -238,7 +328,7 @@ static UniValue CallRPC(const std::string& strMethod, const UniValue& params)
evhttp_add_header(output_headers, "Authorization", (std::string("Basic ") + EncodeBase64(strRPCUserColonPass)).c_str());
// Attach request data
std::string strRequest = JSONRPCRequestObj(strMethod, params, 1).write() + "\n";
std::string strRequest = rh->PrepareRequest(strMethod, args).write() + "\n";
struct evbuffer* output_buffer = evhttp_request_get_output_buffer(req.get());
assert(output_buffer);
evbuffer_add(output_buffer, strRequest.data(), strRequest.size());
@ -277,7 +367,7 @@ static UniValue CallRPC(const std::string& strMethod, const UniValue& params)
UniValue valReply(UniValue::VSTR);
if (!valReply.read(response.body))
throw std::runtime_error("couldn't parse reply from server");
const UniValue& reply = valReply.get_obj();
const UniValue reply = rh->ProcessReply(valReply);
if (reply.empty())
throw std::runtime_error("expected reply to have result, error and id properties");
@ -309,24 +399,25 @@ int CommandLineRPC(int argc, char *argv[])
args.push_back(line);
}
}
if (args.size() < 1) {
throw std::runtime_error("too few parameters (need at least command)");
}
std::string strMethod = args[0];
args.erase(args.begin()); // Remove trailing method name from arguments vector
UniValue params;
if(gArgs.GetBoolArg("-named", DEFAULT_NAMED)) {
params = RPCConvertNamedValues(strMethod, args);
std::unique_ptr<BaseRequestHandler> rh;
std::string method;
if (gArgs.GetBoolArg("-getinfo", false)) {
rh.reset(new GetinfoRequestHandler());
method = "";
} else {
params = RPCConvertValues(strMethod, args);
rh.reset(new DefaultRequestHandler());
if (args.size() < 1) {
throw std::runtime_error("too few parameters (need at least command)");
}
method = args[0];
args.erase(args.begin()); // Remove trailing method name from arguments vector
}
// Execute and handle connection failures with -rpcwait
const bool fWait = gArgs.GetBoolArg("-rpcwait", false);
do {
try {
const UniValue reply = CallRPC(strMethod, params);
const UniValue reply = CallRPC(rh.get(), method, args);
// Parse reply
const UniValue& result = find_value(reply, "result");

21
src/rpc/protocol.cpp
View File

@ -19,7 +19,7 @@
* JSON-RPC protocol. Bitcoin speaks version 1.0 for maximum compatibility,
* but uses JSON-RPC 1.1/2.0 standards for parts of the 1.0 standard that were
* unspecified (HTTP errors and contents of 'error').
*
*
* 1.0 spec: http://json-rpc.org/wiki/specification
* 1.2 spec: http://jsonrpc.org/historical/json-rpc-over-http.html
*/
@ -135,3 +135,22 @@ void DeleteAuthCookie()
}
}
std::vector<UniValue> JSONRPCProcessBatchReply(const UniValue &in, size_t num)
{
if (!in.isArray()) {
throw std::runtime_error("Batch must be an array");
}
std::vector<UniValue> batch(num);
for (size_t i=0; i<in.size(); ++i) {
const UniValue &rec = in[i];
if (!rec.isObject()) {
throw std::runtime_error("Batch member must be object");
}
size_t id = rec["id"].get_int();
if (id >= num) {
throw std::runtime_error("Batch member id larger than size");
}
batch[id] = rec;
}
return batch;
}

2
src/rpc/protocol.h
View File

@ -97,5 +97,7 @@ bool GenerateAuthCookie(std::string *cookie_out);
bool GetAuthCookie(std::string *cookie_out);
/** Delete RPC authentication cookie from disk */
void DeleteAuthCookie();
/** Parse JSON-RPC batch reply into a vector */
std::vector<UniValue> JSONRPCProcessBatchReply(const UniValue &in, size_t num);
#endif // BITCOIN_RPCPROTOCOL_H