mastodon-cpp  0.104.0
example02_stream.cpp
// This file is part of mastodon-cpp.
// Listen to /api/v1/streaming/public and display the events.
// Don't compile this if the Easy-interface is turned off
#ifndef WITHOUT_EASY
#include <iostream>
#include <string>
#include <cstdint>
#include <mutex>
#include <chrono>
#include <vector>
#ifdef MASTODON_CPP
#include "mastodon-cpp.hpp"
#include "easy/all.hpp"
#else
#include <mastodon-cpp/mastodon-cpp.hpp>
#include <mastodon-cpp/easy/all.hpp>
#endif
using std::cout;
using std::cerr;
using std::endl;
using std::string;
using std::uint8_t;
using namespace Mastodon;
int main(int argc, char *argv[])
{
if (argc < 2)
{
std::cerr << "usage: " << argv[0] << " <instance>\n";
return 1;
}
// Construct a Mastodon::Easy object without authorization token.
Easy::API masto(argv[1], "");
// Prepare a pointer to the http object, to cancel the stream later.
std::unique_ptr<API::http> ptr;
// This variable is filled with the stream data.
string stream;
// Get the public timeline. The pointer is set here.
masto.get_stream(API::v1::streaming_public, ptr, stream);
// Listen to the stream for 120 seconds.
for (uint8_t counter = 0; counter < 120; ++counter)
{
std::this_thread::sleep_for(std::chrono::seconds(1));
// Acquire lock for the stream variable to avoid simultaneous access.
std::lock_guard<std::mutex> lock(ptr->get_mutex());
// Parse event stream into a vector.
std::vector<Easy::stream_event> events = Easy::parse_stream(stream);
// Clear the stream buffer.
stream.clear();
for (const Easy::stream_event &event : events)
{
// Print out some information about the events.
switch (event.type)
{
case Easy::event_type::Update:
{
Easy::Status status(event.data);
cout << "[" << status.created_at().strtime("%T") << "] ";
cout << "Status from: " << status.account().acct()
<< " (" << status.url() << ")\n";
break;
}
case Easy::event_type::Notification:
{
Easy::Notification notification(event.data);
cout << "Notification involving: "
<< notification.account().acct()
<< " (" << notification.id() << ")\n";
break;
}
case Easy::event_type::Delete:
{
cout << "Deleted: " << event.data << endl;
break;
}
case Easy::event_type::Error:
{
// Errors are reported in-stream. Print error and exit.
cerr << "Error: " << event.data << endl;
ptr->cancel_stream();
return 1;
}
default:
{
cout << "Something undefined happened. 😱\n";
cout << event.data << endl;
}
}
}
}
// Close connection.
ptr->cancel_stream();
return 0;
}
#else
#include <cstdio>
int main()
{
std::printf("mastodon-cpp was compiled without Easy support.\n");
return 255;
}
#endif // WITHOUT_EASY