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60 lines
1.8 KiB
60 lines
1.8 KiB
/*
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Part of the WEBSERVER MODULE
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Copyright (C) 2016-2019 by Xose Pérez <xose dot perez at gmail dot com>
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*/
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#pragma once
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#include "web.h"
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#include "libs/TypeChecks.h"
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#include <Schedule.h>
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#if WEB_SUPPORT
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namespace asyncwebprint_traits {
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template <typename T>
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using print_callable_t = decltype(std::declval<T>()(std::declval<Print&>()));
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template <typename T>
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using is_print_callable = is_detected<print_callable_t, T>;
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}
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template<typename CallbackType>
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void AsyncWebPrint::scheduleFromRequest(const AsyncWebPrintConfig& config, AsyncWebServerRequest* request, CallbackType callback) {
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static_assert(asyncwebprint_traits::is_print_callable<CallbackType>::value, "CallbackType needs to be a callable with void(Print&)");
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// because of async nature of the server, we need to make sure we outlive 'request' object
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auto print = std::shared_ptr<AsyncWebPrint>(new AsyncWebPrint(config, request));
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// attach one ptr to onDisconnect capture, so we can detect disconnection before scheduled function runs
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request->onDisconnect([print]() {
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print->setState(AsyncWebPrint::State::Done);
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});
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// attach another capture to the scheduled function, so we execute as soon as we exit next loop()
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schedule_function([callback, print]() {
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if (State::None != print->getState()) return;
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callback(*print.get());
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print->flush();
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});
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}
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constexpr AsyncWebPrintConfig AsyncWebPrintDefaults {
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/*mimeType =*/ "text/plain",
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/*backlogCountMax=*/ 2,
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/*backlogSizeMax= */ TCP_MSS,
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/*backlogTimeout= */ 5000
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};
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template<typename CallbackType>
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void AsyncWebPrint::scheduleFromRequest(AsyncWebServerRequest* request, CallbackType callback) {
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AsyncWebPrint::scheduleFromRequest(AsyncWebPrintDefaults, request, callback);
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}
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#endif
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