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HTTP_FULL_SERVER.cpp
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384 lines (321 loc) · 10.4 KB
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#include "http_svr.h"
// https://mariusbancila.ro/blog/2013/08/19/full-fledged-client-server-example-with-cpprest-sdk-110/
//看这个 https://mariusbancila.ro/blog/2017/11/19/revisited-full-fledged-client-server-example-with-c-rest-sdk-2-10/
namespace full_svr
{
#if 0
void display_json(json::value const& jvalue, utility::string_t const& prefix)
{
std::wcout << prefix << jvalue.serialize() << std::endl;
}
/*
n this simple implementation the dictionary is a std::map.
Its content is not persisted to disk, it is reloaded each time the server starts.
*/
std::map<utility::string_t, utility::string_t> dictionary;
//http://cn.voidcc.com/question/p-uoiiighz-boe.html
typedef std::vector<std::pair<utility::string_t, json::value>> field_map;
/*
Let’s now look at the handlers. As mentioned earlier the GET method is a bit different than the others. A GET request
should return all the key-value pairs in the server’s dictionary. Its implementation looks like this:
handlers implementation */
void handle_get(http_request request)
{
TRACE(L"\nhandle GET\n");
//是不是库里没有的
// json::value::field_map answer;
field_map answer;
for (auto const& p : dictionary)
{
// answer.push_back(std::make_pair(json::value(p.first), json::value(p.second)));
answer.push_back(std::make_pair(p.first, json::value(p.second)));
}
//http://cn.voidcc.com/question/p-uoiiighz-boe.html
request.reply(status_codes::OK, json::value::object(answer));
}
void handle_request(http_request request, std::function<void(json::value&, field_map&)> action)
{
field_map answer;
request.extract_json()
.then([&answer, &action](pplx::task<json::value> task) {
try
{
//这里会有报错
auto& const jvalue = task.get();
if (!jvalue.is_null())
{
action(jvalue, answer);
}
}
catch (http_exception const& e)
{
std::wcout << e.what() << std::endl;
}
})
.wait();
request.reply(status_codes::OK, json::value::object(answer));
}
void handle_post(http_request request)
{
TRACE("\nhandle POST\n");
handle_request(request, [](json::value& jvalue, field_map& answer) {
//数组 遍历
for (auto const& e : jvalue.as_array())
{
//数组中的每一项
if (e.is_string())
{
auto key = e.as_string();
//在服务端的字典里里找这个key，生成answer
auto pos = dictionary.find(key);
if (pos == dictionary.end())
{
answer.push_back(make_pair(key, json::value(L"<nil>")));
}
else
{
answer.push_back(make_pair(pos->first, json::value(pos->second)));
}
}
}
});
}
void handle_put(http_request request)
{
TRACE("\nhandle PUT\n");
handle_request(request, [](json::value& jvalue, field_map& answer) {
for (auto const& e : jvalue.as_object())
{
if (e.second.is_string())
{
auto key = e.first;
auto value = e.second.as_string();
if (dictionary.find(key) == dictionary.end())
{
TRACE_ACTION(L"added", key, value);
answer.push_back(make_pair(key, json::value(L"<put>")));
}
else
{
TRACE_ACTION(L"updated", key, value);
answer.push_back(make_pair(key, json::value(L"<updated>")));
}
dictionary[key] = value;
}
}
});
}
void handle_del(http_request request)
{
TRACE("\nhandle DEL\n");
//调用handle_request，传入lambda表达式 std::function<void(json::value&, field_map&)> action
handle_request(request, [](json::value& jvalue, field_map& answer) {
std::set<utility::string_t> keys;
for (auto const& e : jvalue.as_array())
{
if (e.is_string())
{
auto key = e.as_string();
auto pos = dictionary.find(key);
if (pos == dictionary.end())
{
answer.push_back(make_pair(key, json::value(L"<failed>")));
}
else
{
TRACE_ACTION(L"deleted", pos->first, pos->second);
answer.push_back(make_pair(key, json::value(L"<deleted>")));
keys.insert(key);
}
}
}
for (auto const& key : keys)
dictionary.erase(key);
});
}
int svr_main(int argc, char** argv)
{
http_listener listener(L"http://localhost/restdemo");
listener.support(methods::GET, handle_get);
listener.support(methods::POST, handle_post);
listener.support(methods::PUT, handle_put);
listener.support(methods::DEL, handle_del);
try
{
listener.open().then([&listener]() { TRACE(L"\nstarting to listen\n"); }).wait();
while (true)
;
}
catch (std::exception const& e)
{
std::wcout << e.what() << std::endl;
}
return 0;
}
#else /// https://mariusbancila.ro/blog/2017/11/19/revisited-full-fledged-client-server-example-with-c-rest-sdk-2-10/
/*
I will not reiterate all the details described in the former article. However, in summary, the server maintains a
dictionary of values (both keys and values are strings). Through HTTP calls a client can retrieve the content of the
dictionary, add new values, update or delete existing ones.
客户端主要是对服务端的dictionary做读取/修改
*/
std::map<utility::string_t, utility::string_t> dictionary;
void display_json(json::value const& jvalue, utility::string_t const& prefix)
{
std::wcout << prefix << jvalue.serialize() << std::endl;
}
void handle_get(http_request request)
{
TRACE(L"\nhandle GET\n");
auto answer = json::value::object();
for (auto const& p : dictionary)
{
answer[p.first] = json::value::string(p.second);
}
display_json(json::value::null(), L"R: ");
display_json(answer, L"S: ");
request.reply(status_codes::OK, answer);
}
void handle_request(http_request request, std::function<void(web::json::value const&, web::json::value&)> action)
{
auto answer = web::json::value::object();
request.extract_json()
.then([&answer, &action](pplx::task<web::json::value> task) {
try
{
auto const& jvalue = task.get();
display_json(jvalue, L"R: ");
if (!jvalue.is_null())
{
action(jvalue, answer);
}
else
{
std::wcout << "jvalue.is_null() !!!!err!!!!" << std::endl;
}
}
catch (http_exception const& e)
{
std::wcout << e.what() << std::endl;
}
})
.wait();
display_json(answer, L"S: ");
request.reply(status_codes::OK, answer);
}
void handle_post(http_request request)
{
TRACE("\nhandle POST\n");
handle_request(request, [](json::value const& jvalue, json::value& answer) {
for (auto const& e : jvalue.as_array())
{
if (e.is_string())
{
auto key = e.as_string();
auto pos = dictionary.find(key);
if (pos == dictionary.end())
{
answer[key] = json::value::string(L"<nil>");
}
else
{
answer[pos->first] = json::value::string(pos->second);
}
}
}
});
}
void handle_put(http_request request)
{
TRACE("\nhandle PUT\n");
handle_request(request, [](json::value const& jvalue, json::value& answer) {
for (auto const& e : jvalue.as_object())
{
if (e.second.is_string())
{
auto key = e.first;
auto value = e.second.as_string();
if (dictionary.find(key) == dictionary.end())
{
TRACE_ACTION(L"added", key, value);
answer[key] = json::value::string(L"<put>");
}
else
{
TRACE_ACTION(L"updated", key, value);
answer[key] = json::value::string(L"<updated>");
}
dictionary[key] = value;
}
}
});
}
void handle_del(http_request request)
{
TRACE("\nhandle DEL\n");
handle_request(request, [](json::value const& jvalue, json::value& answer) {
std::set<utility::string_t> keys;
for (auto const& e : jvalue.as_array())
{
if (e.is_string())
{
auto key = e.as_string();
auto pos = dictionary.find(key);
if (pos == dictionary.end())
{
answer[key] = json::value::string(L"<failed>");
}
else
{
TRACE_ACTION(L"deleted", pos->first, pos->second);
answer[key] = json::value::string(L"<deleted>");
keys.insert(key);
}
}
}
for (auto const& key : keys)
dictionary.erase(key);
});
}
}
/*
starting to listen
handle PUT
R: {"one":"100","two":"200"}
added (one, 100)
added (two, 200)
S: {"one":"<put>","two":"<put>"}
handle POST
R: ["one","two","three"]
S: {"one":"100","three":"<nil>","two":"200"}
handle DEL
R: ["one"]
deleted (one, 100)
S: {"one":"<deleted>"}
handle POST
R: ["one","two","three"]
S: {"one":"<nil>","three":"<nil>","two":"200"}
handle GET
R: null
S: {"two":"200"}
*/
int full_svr_main(int argc, char** argv)
{
http_listener listener(L"http://localhost:8888/restdemo");
listener.support(methods::GET, full_svr::handle_get);
listener.support(methods::POST, full_svr::handle_post);
listener.support(methods::PUT, full_svr::handle_put);
listener.support(methods::DEL, full_svr::handle_del);
try
{
listener.open().then([&listener]() { TRACE(L"\nstarting to listen\n"); }).wait();
while (true)
;
}
catch (std::exception const& e)
{
std::wcout << e.what() << std::endl;
}
return 0;
}
#endif