foster/bitcoin-bitcoin-core
0
0
Fork 0
mirror of https://github.com/bitcoin/bitcoin.git synced 2025-02-03 09:56:38 -05:00
Code Issues Activity

cli: extract connection exception handler, -rpcwait logic

Browse source 
to ConnectAndCallRPC() to be callable for individual connections.

This is needed for RPCs that need to be called and handled sequentially, rather
than alone or in a batch.

For example, when fetching the balances for each loaded wallet, -getinfo will
call RPC listwallets, and then, depending on the result, RPC getbalances.

It may be somewhat helpful to review this commit with `git show -w`.
This commit is contained in:
Jon Atack 2020-04-12 21:01:29 +02:00
parent 5f19155e5b
commit 29f2cbdeb7
No known key found for this signature in database
GPG key ID: 4F5721B3D0E3921D
1 changed files with 62 additions and 49 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

111
src/bitcoin-cli.cpp
View file

@ -418,6 +418,40 @@ static UniValue CallRPC(BaseRequestHandler *rh, const std::string& strMethod, co
return reply;
}
/**
* ConnectAndCallRPC wraps CallRPC with -rpcwait and an exception handler.
*
* @param[in] rh Pointer to RequestHandler.
* @param[in] strMethod Reference to const string method to forward to CallRPC.
* @returns the RPC response as a UniValue object.
* @throws a CConnectionFailed std::runtime_error if connection failed or RPC server still in warmup.
*/
static UniValue ConnectAndCallRPC(BaseRequestHandler* rh, const std::string& strMethod, const std::vector<std::string>& args)
{
UniValue response(UniValue::VOBJ);
// Execute and handle connection failures with -rpcwait.
const bool fWait = gArgs.GetBoolArg("-rpcwait", false);
do {
try {
response = CallRPC(rh, strMethod, args);
if (fWait) {
const UniValue& error = find_value(response, "error");
if (!error.isNull() && error["code"].get_int() == RPC_IN_WARMUP) {
throw CConnectionFailed("server in warmup");
}
}
break; // Connection succeeded, no need to retry.
} catch (const CConnectionFailed&) {
if (fWait) {
UninterruptibleSleep(std::chrono::milliseconds{1000});
} else {
throw;
}
}
} while (fWait);
return response;
}
static int CommandLineRPC(int argc, char *argv[])
{
std::string strPrint;
@ -485,62 +519,41 @@ static int CommandLineRPC(int argc, char *argv[])
method = args[0];
args.erase(args.begin()); // Remove trailing method name from arguments vector
}
const UniValue reply = ConnectAndCallRPC(rh.get(), method, args);
// Execute and handle connection failures with -rpcwait
const bool fWait = gArgs.GetBoolArg("-rpcwait", false);
do {
try {
const UniValue reply = CallRPC(rh.get(), method, args);
// Parse reply
UniValue result = find_value(reply, "result");
const UniValue& error = find_value(reply, "error");
if (!error.isNull()) {
// Error
strPrint = "error: " + error.write();
nRet = abs(error["code"].get_int());
if (error.isObject()) {
const UniValue& errCode = find_value(error, "code");
const UniValue& errMsg = find_value(error, "message");
strPrint = errCode.isNull() ? "" : ("error code: " + errCode.getValStr() + "\n");
// Parse reply
const UniValue& result = find_value(reply, "result");
const UniValue& error = find_value(reply, "error");
if (!error.isNull()) {
// Error
int code = error["code"].get_int();
if (fWait && code == RPC_IN_WARMUP)
throw CConnectionFailed("server in warmup");
strPrint = "error: " + error.write();
nRet = abs(code);
if (error.isObject())
{
UniValue errCode = find_value(error, "code");
UniValue errMsg = find_value(error, "message");
strPrint = errCode.isNull() ? "" : "error code: "+errCode.getValStr()+"\n";
if (errMsg.isStr())
strPrint += "error message:\n"+errMsg.get_str();
if (errCode.isNum() && errCode.get_int() == RPC_WALLET_NOT_SPECIFIED) {
strPrint += "\nTry adding \"-rpcwallet=<filename>\" option to bitcoin-cli command line.";
}
}
} else {
// Result
if (result.isNull())
strPrint = "";
else if (result.isStr())
strPrint = result.get_str();
else
strPrint = result.write(2);
if (errMsg.isStr()) {
strPrint += ("error message:\n" + errMsg.get_str());
}
if (errCode.isNum() && errCode.get_int() == RPC_WALLET_NOT_SPECIFIED) {
strPrint += "\nTry adding \"-rpcwallet=<filename>\" option to bitcoin-cli command line.";
}
// Connection succeeded, no need to retry.
break;
}
catch (const CConnectionFailed&) {
if (fWait)
UninterruptibleSleep(std::chrono::milliseconds{1000});
else
throw;
} else {
// Result
if (result.isNull()) {
strPrint = "";
} else if (result.isStr()) {
strPrint = result.get_str();
} else {
strPrint = result.write(2);
}
} while (fWait);
}
catch (const std::exception& e) {
}
} catch (const std::exception& e) {
strPrint = std::string("error: ") + e.what();
nRet = EXIT_FAILURE;
}
catch (...) {
} catch (...) {
PrintExceptionContinue(nullptr, "CommandLineRPC()");
throw;
}