Print First Shelley Blocks
This example prints the first 3 blocks of the Shelley era:
#include <stdexcept> #include <string_view> // Third-party libraries #include <nlohmann/json.hpp> #include <ogmios/client.hpp> #include <spdlog/spdlog.h> using json = nlohmann::json; using namespace nlohmann::literals; using namespace std::literals; namespace { constexpr auto NETWORK = "preprod"sv; } auto main() -> int { spdlog::set_level(spdlog::level::debug); // Set global log level // Create a client to manage the Ogmios server connection. auto client = ogmios::Client("ws://localhost:1337"); // Setup the logging callback to print information to stdout. client.setLoggerCallback( [](int level, const std::string& msg) { spdlog::log(static_cast<spdlog::level::level_enum>(level), msg); } ); // Create a point from the last block of the Byron era auto point = "[]"_json; if (NETWORK == "mainnet"sv) { point[0]["slot"] = 4492799; point[0]["id"] = "f8084c61b6a238acec985b59310b6ecec49c0ab8352249afd7268da5cff2a457"; } else if (NETWORK == "preprod"sv) { point[0]["slot"] = 84242; point[0]["id"] = "45899e8002b27df291e09188bfe3aeb5397ac03546a7d0ead93aa2500860f1af"; } else { throw std::runtime_error("Unsupported network"); } // Get the intersection of the last Byron block // The findIntersection method runs asynchronously and returns a future, // calling get here will wait indefinitely for the result (use wait_for in // production code). client.findIntersection(point).get(); // Now print the next 3 blocks, which will be in the Shelley era for (auto blocksPrinted = 0; blocksPrinted < 3;) { auto result = client.nextBlock().get(); if (result["result"]["direction"] == "forward") { spdlog::info( "Shelley Block #{}: Height = {}, ID = {}", ++blocksPrinted, result["result"]["block"]["height"].dump(), result["result"]["block"]["id"].dump() ); } } return 0; } // main
Example output:
