Michael Davidsaver
115 lines
4.2 KiB
C++
115 lines
4.2 KiB
C++
/*
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* pvxs is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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*
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* Author George S. McIntyre <george@level-n.com>, 2023
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*
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*/
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#ifndef PVXS_IOCSHCOMMAND_H
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#define PVXS_IOCSHCOMMAND_H
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#include <atomic>
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#include <memory>
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#include <stdexcept>
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#include <sstream>
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#include <iocsh.h>
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#include <pvxs/iochooks.h>
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#include "iocshargument.h"
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#include "iocshindex.h"
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namespace pvxs {
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namespace ioc {
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// All shell commands return void and take a variable number of arguments of any supported type
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template<typename ...IOCShFunctionArgumentTypes>
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using IOCShFunction = void (*)(IOCShFunctionArgumentTypes...);
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// messy to include epicsStdio.h from a header
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PVXS_IOC_API
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void printIOCShError(const std::exception& e);
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/**
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* Class that encapsulates an IOC command.
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* The command has a name and a description.
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*
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* A method allows you to register the implementation of the command.
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*
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* The constructor takes the name of the function and the help text
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* Call implementation() with a reference to your implementation function to complete registration
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*
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* e.g.:
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* pvxs::ioc::IOCShRegister<int>("pvxsl", "show detailed info?").implementation<&pvxsl>();
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*
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* @tparam IOCShFunctionArgumentTypes the list of 0 or more argument types for the shell function to be registered
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*/
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template<typename ...IOCShFunctionArgumentTypes>
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class IOCShCommand {
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public:
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const char* const name;
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const char* const argumentNames[1 + sizeof...(IOCShFunctionArgumentTypes)];
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const char* const usage = nullptr;
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// Construct a new IOC shell command with a name and description
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constexpr explicit IOCShCommand(const char* name, ConstString<IOCShFunctionArgumentTypes>... argumentDescriptions)
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:name(name), argumentNames{ argumentDescriptions..., 0 } {
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}
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// Construct a new IOC shell command with a name and description
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constexpr explicit IOCShCommand(const char* name, ConstString<IOCShFunctionArgumentTypes>... argumentDescriptions,
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const char* usage)
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:name(name), argumentNames{ argumentDescriptions..., 0 }, usage(usage) {
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}
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// Create an implementation for this IOC command
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template<IOCShFunction<IOCShFunctionArgumentTypes ...> function>
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void implementation() {
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implement<function>(make_index_sequence<sizeof...(IOCShFunctionArgumentTypes)>{});
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}
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// Implement the command by registering the callback with EPICS iocshRegister()
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template<IOCShFunction<IOCShFunctionArgumentTypes ...> function, size_t... Idxs>
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void implement(index_sequence<Idxs...>) {
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static const iocshArg argstack[1 + sizeof...(IOCShFunctionArgumentTypes)] = {
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{ argumentNames[Idxs], IOCShFunctionArgument<IOCShFunctionArgumentTypes>::code }... };
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static const iocshArg* const arguments[] = { &argstack[Idxs]..., 0 };
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static const iocshFuncDef functionDefinition = { name, sizeof...(IOCShFunctionArgumentTypes), arguments
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#ifdef IOCSHFUNCDEF_HAS_USAGE
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,usage
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#endif
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};
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iocshRegister(&functionDefinition, &call < function, Idxs... >);
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}
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// The actual callback that is executed for the registered command
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// The function is called with a variadic argument list of heterogeneous types based on the
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// declared registration template types
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// by calling the appropriate get methods on the templated Arg(s)
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template<IOCShFunction<IOCShFunctionArgumentTypes ...> function, size_t... Idxs>
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static void call(const iocshArgBuf* iocShArgumentsBuffer) noexcept {
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try {
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(*function)(IOCShFunctionArgument<IOCShFunctionArgumentTypes>::get(iocShArgumentsBuffer[Idxs])...);
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} catch(std::exception& e) {
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printIOCShError(e);
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#if EPICS_VERSION_INT >= VERSION_INT(7, 0, 3, 1)
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iocshSetError(1);
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#endif
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}
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}
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};
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} // pvxs
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} // ioc
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/**
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* Run given lambda function against the provided pvxs server instance
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* @param _lambda the lambda function to run against the provided pvxs server instance
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*/
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#define runOnPvxsServer(_lambda) runOnServer(_lambda, __func__)
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#endif //PVXS_IOCSHCOMMAND_H
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