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Adds support for optional fields

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This commit is contained in:
Marcelo Zimbres
2025-02-08 21:59:39 +01:00
parent 31ceed9f8f
commit 412f5535ea
8 changed files with 287 additions and 112 deletions
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46
example/cpp20_containers.cpp
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@@ -1,4 +1,4 @@
/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
/* Copyright (c) 2018-2025 Marcelo Zimbres Silva (mzimbres@gmail.com)
*
* Distributed under the Boost Software License, Version 1.0. (See
* accompanying file LICENSE.txt)
@@ -24,13 +24,25 @@ using boost::asio::awaitable;
using boost::asio::detached;
using boost::asio::consign;
template<class T>
std::ostream& operator<<(std::ostream& os, std::optional<T> const& opt)
{
if (opt.has_value())
std::cout << opt.value();
else
std::cout << "null";
return os;
}
void print(std::map<std::string, std::string> const& cont)
{
for (auto const& e: cont)
std::cout << e.first << ": " << e.second << "\n";
}
void print(std::vector<int> const& cont)
template <class T>
void print(std::vector<T> const& cont)
{
for (auto const& e: cont) std::cout << e << " ";
std::cout << "\n";
@@ -48,6 +60,7 @@ auto store(std::shared_ptr<connection> conn) -> awaitable<void>
request req;
req.push_range("RPUSH", "rpush-key", vec);
req.push_range("HSET", "hset-key", map);
req.push("SET", "key", "value");
co_await conn->async_exec(req, ignore);
}
@@ -67,6 +80,21 @@ auto hgetall(std::shared_ptr<connection> conn) -> awaitable<void>
print(std::get<0>(resp).value());
}
auto mget(std::shared_ptr<connection> conn) -> awaitable<void>
{
// A request contains multiple commands.
request req;
req.push("MGET", "key", "non-existing-key");
// Responses as tuple elements.
response<std::vector<std::optional<std::string>>> resp;
// Executes the request and reads the response.
co_await conn->async_exec(req, resp);
print(std::get<0>(resp).value());
}
// Retrieves in a transaction.
auto transaction(std::shared_ptr<connection> conn) -> awaitable<void>
{
@@ -74,19 +102,26 @@ auto transaction(std::shared_ptr<connection> conn) -> awaitable<void>
req.push("MULTI");
req.push("LRANGE", "rpush-key", 0, -1); // Retrieves
req.push("HGETALL", "hset-key"); // Retrieves
req.push("MGET", "key", "non-existing-key");
req.push("EXEC");
response<
ignore_t, // multi
ignore_t, // lrange
ignore_t, // hgetall
response<std::optional<std::vector<int>>, std::optional<std::map<std::string, std::string>>> // exec
ignore_t, // mget
response<
std::optional<std::vector<int>>,
std::optional<std::map<std::string, std::string>>,
std::optional<std::vector<std::optional<std::string>>>
> // exec
> resp;
co_await conn->async_exec(req, resp);
print(std::get<0>(std::get<3>(resp).value()).value().value());
print(std::get<1>(std::get<3>(resp).value()).value().value());
print(std::get<0>(std::get<4>(resp).value()).value().value());
print(std::get<1>(std::get<4>(resp).value()).value().value());
print(std::get<2>(std::get<4>(resp).value()).value().value());
}
// Called from the main function (see main.cpp)
@@ -98,6 +133,7 @@ awaitable<void> co_main(config cfg)
co_await store(conn);
co_await transaction(conn);
co_await hgetall(conn);
co_await mget(conn);
conn->cancel();
}