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https://github.com/nasa/trick.git
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19025d77ad
Reorganized. Created a new top level include directory that will hold all of Trick's header files. Moved all of the Trick headers to this directory. Created a libexec directory that holds all of the executables that users don't need to execute directly. Changed all of the executables remaining in bin to start with "trick-". In the sim_services directories changed all source files to find the Trick headers in their new location. Since all of the include files are gone in sim_services, removed the src directories as well, moving all of the source files up a level. Moved the makefiles, docs, man, and other architecture independent files into a top level share directory. Renamed lib_${TRICK_HOST_CPU} to lib64 or lib depending on the platform we're currently on.
refs #63
316 lines
12 KiB
C++
316 lines
12 KiB
C++
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#include <iostream>
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#include <sstream>
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#include <stdlib.h>
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#include <string.h>
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#include "trick/JSONVariableServerThread.hh"
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#include "trick/MemoryManager.hh"
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#include "trick/memorymanager_c_intf.h"
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#include "trick/exec_proto.h"
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#include "trick/PythonPrint.hh"
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#include "trick/tc_proto.h"
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#include "trick/TrickConstant.hh"
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Trick::JSONVariableServerThread::JSONVariableServerThread(TCDevice * listen_dev) :
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Trick::ThreadBase("JSONVarServer") {
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connection.disable_handshaking = TC_COMM_TRUE ;
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connection.blockio_type = TC_COMM_BLOCKIO ;
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tc_accept(listen_dev, &connection);
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// Save the hostname and port of the listen server
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hostname = listen_dev->hostname ;
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port = listen_dev->port ;
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incoming_msg = new char[MAX_CMD_LEN] ;
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}
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/*
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@details
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-# delete the space for incominig_msg.
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-# These classes are always allocated... free the memory on the way out.
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*/
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Trick::JSONVariableServerThread::~JSONVariableServerThread() {
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delete [] incoming_msg ;
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delete this ;
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}
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/*
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@details
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-# Loop until the connection is broken or timed_out
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-# Call select to wait up to 15 seconds for a message.
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-# If a message is found, read it into the incoming_msg buffer
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-# Call parse_request on the incoming_msg buffer
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-# Disconnect the socket connection
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*/
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void * Trick::JSONVariableServerThread::thread_body() {
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int nbytes = -1 ;
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socklen_t sock_size = sizeof(connection.remoteServAddr) ;
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fd_set rfds;
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struct timeval timeout_time = { 15, 0 };
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bool timed_out = false ;
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while (! timed_out and nbytes != 0 ) {
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FD_ZERO(&rfds);
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FD_SET(connection.socket, &rfds);
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timeout_time.tv_sec = 15 ;
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select(connection.socket + 1, &rfds, NULL, NULL, &timeout_time);
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if ( FD_ISSET(connection.socket, &rfds)) {
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nbytes = recvfrom( connection.socket, incoming_msg, MAX_CMD_LEN, 0 ,
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(struct sockaddr *)&connection.remoteServAddr, &sock_size ) ;
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//std::cout << "nbytes = " << nbytes << std::endl ;
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if (nbytes != 0 ) {
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//std::cout << incoming_msg << std::endl ;
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parse_request() ;
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}
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} else {
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timed_out = true ;
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}
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}
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tc_disconnect(&connection) ;
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//std::cout << "closed variable server connection" << std::endl ;
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return NULL ;
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}
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/*
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@details
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-# scan the incoming message for the command and requested path
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-# start the return message with a "{"
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-# if both a command and request is present
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-# if the command is "GET"
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-# if the path is "/" call get_top_page
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-# else if the path starts with "/vars" call get_vars
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-# else if the path starts with "/commands" call get_commands
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-# else create an error message reply
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-# else if the command is "POST" do something at some point.
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-# else create an error message reply
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-# else create an error message reply
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-# close the return message with a "}"
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-# create the http header for the reply message
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-# call tc_write to send the reply message
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*/
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void Trick::JSONVariableServerThread::parse_request() {
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// Need to protect against buffer overflow
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char command[32] ;
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char path[512] ;
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std::stringstream ss ;
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std::stringstream body ;
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int ret ;
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ret = sscanf(incoming_msg, "%s %s", command , path) ;
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body << "{" << std::endl ;
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if ( ret == 2 ) {
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//std::cout << "command = " << command << std::endl ;
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//std::cout << "path = " << path << std::endl ;
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if ( ! strcmp(command, "GET") ) {
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if ( ! strcmp(path, "/") ) {
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// send the top page
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ret = get_top_page(body) ;
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} else if ( ! strncmp(path, "/vars", 5)) {
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// get list of variables or value
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ret = get_vars(body, &path[5]) ;
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} else if ( ! strncmp(path, "/commands", 9)) {
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// get list of commands
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ret = get_commands(body, &path[9]) ;
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} else {
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ret = 404 ;
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body << " \"name\" : \"" << path << "\" ," << std::endl ;
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body << " \"message\" : \"Not Found\"" << std::endl ;
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}
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} else if ( ! strcmp( command, "POST") ) {
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//TODO: Allow setting variable values with POST.
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ret = 405 ;
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body << " \"verb\" : \"" << command << "\" ," << std::endl ;
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body << " \"message\" : \"Method not allowed\"" << std::endl ;
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} else {
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ret = 405 ;
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body << " \"verb\" : \"" << command << "\" ," << std::endl ;
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body << " \"message\" : \"Method not allowed\"" << std::endl ;
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}
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} else {
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ret = 400 ;
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body << " \"message\" : \"Bad Request\"" << std::endl ;
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}
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body << "}" << std::endl ;
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ss << "HTTP/1.1 " << ret ;
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switch (ret) {
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case 200:
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ss << " OK" ;
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break ;
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case 400:
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ss << " Bad Request" ;
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break ;
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case 404:
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ss << " Not Found" ;
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break ;
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case 405:
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ss << " Method Not Allowed" ;
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break ;
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default:
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ss << " Unknown" ;
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break ;
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}
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ss << std::endl ;
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ss << "Content-Type: application/json" << std::endl ;
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ss << "Content-Length: " << body.str().size() << std::endl << std::endl ;
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ss << body.str() ;
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//std::cout << ss.str() ;
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tc_write(&connection, (char *)ss.str().c_str() , ss.str().size()) ;
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}
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/*
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@details
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-# create top page contents and return success
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*/
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int Trick::JSONVariableServerThread::get_top_page( std::stringstream & body ) {
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body << " \"commands\": \"http://" << hostname << ":" << port << "/commands\"," << std::endl ;
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body << " \"vars\": \"http://" << hostname << ":" << port << "/vars\"" << std::endl ;
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return 200 ;
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}
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/*
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@details
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-# if the path is empty after /commands create commands top level page.
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-# else if the path is exec_get_sim_time return create a message with the sim time.
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-# else create an error message.
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*/
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int Trick::JSONVariableServerThread::get_commands( std::stringstream & body , char * path ) {
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int ret = 200 ;
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if ( path[strlen(path) - 1] == '/') {
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path[strlen(path) - 1] = '\0' ;
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}
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if ( path[0] == '\0' ) {
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body << " \"exec_get_sim_time\": \"exec_get_sim_time()\"" << std::endl ;
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} else if ( ! strcmp( path , "/exec_get_sim_time" ) ) {
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body << " \"sim_time\": \"" << exec_get_sim_time() << "\"" << std::endl ;
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} else {
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body << " \"message\" : \"Not Found\"" << std::endl ;
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ret = 404 ;
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}
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return ret ;
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}
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/*
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@details
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-# if the path is empty after /vars
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-# loop through all allocations in the memory manager
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-# if the allocation has a name create an item in the reply message for that allocation.
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-# else
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-# convert "/" characters to "." in the path and strip trailing "/" characters.
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-# add converted variable name to the reply message.
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-# call ref_attributes to find the variable.
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-# if the variable exists
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-# if the variable type is a structure.
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-# loop through the attributes and add each of the struct/class variables as links in the reply message.
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-# else add the variables value and units to the reply message.
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-# add the description text to the reply message
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-# add the type information to the reply message
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-# add the type io specification to the reply message
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-# if the variable has dimensions add the dimension information to the reply message.
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-# else add an error message to the reply message
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*/
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int Trick::JSONVariableServerThread::get_vars( std::stringstream & body , char * path ) {
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int ret = 200 ;
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//std::cout << "get_vars " << path << std::endl ;
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if ( path[0] == '\0' ) {
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Trick::ALLOC_INFO_MAP_ITER aim_it ;
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bool first_item = true ;
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for ( aim_it = trick_MM->alloc_info_map_begin() ; aim_it != trick_MM->alloc_info_map_end() ; aim_it++ ) {
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ALLOC_INFO * alloc_info = (*aim_it).second ;
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if ( alloc_info->name != NULL and alloc_info->user_type_name != NULL ) {
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if ( first_item == true ) {
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first_item = false ;
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} else {
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body << " ," << std::endl ;
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}
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body << " \"" << alloc_info->name << "\" : \"" << alloc_info->user_type_name << "\"" ;
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}
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}
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body << std::endl ;
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} else {
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//TODO: More path character translations for characters like "[]"
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if ( path[strlen(path) - 1] == '/') {
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path[strlen(path) - 1] = '\0' ;
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}
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for ( unsigned int ii = 1 ; ii < strlen(path) ; ii++ ) {
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if ( path[ii] == '/') {
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path[ii] = '.' ;
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}
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}
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body << " \"name\" : \"" << &path[1] << "\" ," << std::endl ;
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//std::cout << "getting var " << path << std::endl ;
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// skip leading "/"
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REF2 * ref = ref_attributes( &path[1] ) ;
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if ( ref != NULL and ref->attr != NULL ) {
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ret = 200 ;
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//std::cout << "num_index " << ref->num_index << std::endl ;
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if ( ref->attr->type == TRICK_STRUCTURED ) {
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ATTRIBUTES * attr = (ATTRIBUTES *)ref->attr->attr ;
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body << " \"links\" : [" << std::endl ;
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for ( int ii = 0 ; attr[ii].name[0] != '\0' ; ii++ ) {
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if ( ii != 0 ) {
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body << " ," << std::endl ;
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}
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body << " \"" << attr[ii].name << "\"" ;
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}
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body << std::endl << " ] ," << std::endl ;
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} else {
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body << " \"value\" : " ;
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Trick::PythonPrint::write_rvalue(body, ref->address, ref->attr, ref->num_index, 0, false, true) ;
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body << " ," << std::endl ;
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if ( ref->attr->units != NULL ) {
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body << " \"units\" : \"" << ref->attr->units << "\" ," << std::endl ;
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}
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}
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if ( ref->attr->des != NULL ) {
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body << " \"description\" : \"" << ref->attr->des << "\" ," << std::endl ;
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}
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body << " \"type_name\" : " ;
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if ( ref->attr->type_name != NULL ) {
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body << "\"" << ref->attr->type_name << "\" ," << std::endl ;
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} else {
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body << "\"(null)\" ," << std::endl ;
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}
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body << " \"type\" : " << ref->attr->type << " ," << std::endl ;
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body << " \"io\" : " << ref->attr->io ;
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if ( (ref->attr->num_index - ref->num_index) > 0 ) {
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body << " ," << std::endl ;
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body << " \"num_index\" : " << ref->attr->num_index - ref->num_index << " ," << std::endl ;
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body << " \"index\" : [" << std::endl ;
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for ( int ii = ref->num_index , jj = 0 ; ii < ref->attr->num_index ; ii++ , jj++ ) {
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if ( jj != 0 ) {
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body << " ," << std::endl ;
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}
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body << " {" << std::endl ;
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body << " \"size\" : " << ref->attr->index[ii].size << " ," << std::endl ;
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body << " \"start\" : " << ref->attr->index[ii].start << std::endl ;
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body << " }" ;
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}
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body << std::endl << " ]" << std::endl ;
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} else {
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body << std::endl ;
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}
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free(ref) ;
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} else {
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body << " \"message\" : \"Not Found\"" << std::endl ;
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ret = 404 ;
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}
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}
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return ret ;
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}
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