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asyncrpcoperation.cpp
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asyncrpcoperation.cpp
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// Copyright (c) 2016 The Zcash developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "asyncrpcoperation.h"
#include <boost/uuid/uuid.hpp>
#include <boost/uuid/uuid_generators.hpp>
#include <boost/uuid/uuid_io.hpp>
#include <string>
#include <ctime>
#include <chrono>
using namespace std;
using namespace json_spirit;
static boost::uuids::random_generator uuidgen;
std::map<OperationStatus, std::string> OperationStatusMap = {
{OperationStatus::READY, "queued"},
{OperationStatus::EXECUTING, "executing"},
{OperationStatus::CANCELLED, "cancelled"},
{OperationStatus::FAILED, "failed"},
{OperationStatus::SUCCESS, "success"}
};
/**
* Every operation instance should have a globally unique id
*/
AsyncRPCOperation::AsyncRPCOperation() : error_code_(0), error_message_() {
// Set a unique reference for each operation
boost::uuids::uuid uuid = uuidgen();
id_ = "opid-" + boost::uuids::to_string(uuid);
creation_time_ = (int64_t)time(NULL);
set_state(OperationStatus::READY);
}
AsyncRPCOperation::AsyncRPCOperation(const AsyncRPCOperation& o) :
id_(o.id_), creation_time_(o.creation_time_), state_(o.state_.load()),
start_time_(o.start_time_), end_time_(o.end_time_),
error_code_(o.error_code_), error_message_(o.error_message_),
result_(o.result_)
{
}
AsyncRPCOperation& AsyncRPCOperation::operator=( const AsyncRPCOperation& other ) {
this->id_ = other.id_;
this->creation_time_ = other.creation_time_;
this->state_.store(other.state_.load());
this->start_time_ = other.start_time_;
this->end_time_ = other.end_time_;
this->error_code_ = other.error_code_;
this->error_message_ = other.error_message_;
this->result_ = other.result_;
return *this;
}
AsyncRPCOperation::~AsyncRPCOperation() {
}
/**
* Override this cancel() method if you can interrupt main() when executing.
*/
void AsyncRPCOperation::cancel() {
if (isReady()) {
set_state(OperationStatus::CANCELLED);
}
}
/**
* Start timing the execution run of the code you're interested in
*/
void AsyncRPCOperation::start_execution_clock() {
std::lock_guard<std::mutex> guard(lock_);
start_time_ = std::chrono::system_clock::now();
}
/**
* Stop timing the execution run
*/
void AsyncRPCOperation::stop_execution_clock() {
std::lock_guard<std::mutex> guard(lock_);
end_time_ = std::chrono::system_clock::now();
}
/**
* Implement this virtual method in any subclass. This is just an example implementation.
*/
void AsyncRPCOperation::main() {
if (isCancelled()) {
return;
}
set_state(OperationStatus::EXECUTING);
start_execution_clock();
// Do some work here..
stop_execution_clock();
// If there was an error, you might set it like this:
/*
setErrorCode(123);
setErrorMessage("Murphy's law");
setState(OperationStatus::FAILED);
*/
// Otherwise, if the operation was a success:
Value v("We have a result!");
set_result(v);
set_state(OperationStatus::SUCCESS);
}
/**
* Return the error of the completed operation as a Value object.
* If there is no error, return null Value.
*/
Value AsyncRPCOperation::getError() const {
if (!isFailed()) {
return Value::null;
}
std::lock_guard<std::mutex> guard(lock_);
Object error;
error.push_back(Pair("code", this->error_code_));
error.push_back(Pair("message", this->error_message_));
return Value(error);
}
/**
* Return the result of the completed operation as a Value object.
* If the operation did not succeed, return null Value.
*/
Value AsyncRPCOperation::getResult() const {
if (!isSuccess()) {
return Value::null;
}
std::lock_guard<std::mutex> guard(lock_);
return this->result_;
}
/**
* Returns a status Value object.
* If the operation has failed, it will include an error object.
* If the operation has succeeded, it will include the result value.
* If the operation was cancelled, there will be no error object or result value.
*/
Value AsyncRPCOperation::getStatus() const {
OperationStatus status = this->getState();
Object obj;
obj.push_back(Pair("id", this->id_));
obj.push_back(Pair("status", OperationStatusMap[status]));
obj.push_back(Pair("creation_time", this->creation_time_));
// TODO: Issue #1354: There may be other useful metadata to return to the user.
Value err = this->getError();
if (!err.is_null()) {
obj.push_back(Pair("error", err.get_obj()));
}
Value result = this->getResult();
if (!result.is_null()) {
obj.push_back(Pair("result", result));
// Include execution time for successful operation
std::chrono::duration<double> elapsed_seconds = end_time_ - start_time_;
obj.push_back(Pair("execution_secs", elapsed_seconds.count()));
}
return Value(obj);
}
/**
* Return the operation state in human readable form.
*/
std::string AsyncRPCOperation::getStateAsString() const {
OperationStatus status = this->getState();
return OperationStatusMap[status];
}