266 lines
8.5 KiB
C++
266 lines
8.5 KiB
C++
#include "lpxclient.hpp"
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#include "drivenengine.hpp"
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#include "world.hpp"
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#include "luaconsole.hpp"
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#include "invocation.hpp"
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#include "util.hpp"
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#include <memory>
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class LpxClient : public DrivenEngine {
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public:
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using StringVec = LuaConsole::StringVec;
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UniqueWorld world_;
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int64_t actor_id_;
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InvocationQueue unack_;
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UniqueChannel channel_;
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LuaConsole console_;
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Gui gui_;
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int64_t gui_place_;
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public:
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void set_initial_state() {
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// Create the world model.
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world_.reset(new World(util::WORLD_TYPE_C_SYNC));
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// Snapshot the initial state.
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world_->snapshot();
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// Clear the unack command queue.
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unack_.clear();
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// This is a temporary actor that will be used only until the server sends
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// us the first difference transmission. We do this only to establish
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// the invariant that there's always an actor. When the first difference
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// transmission arrives, this actor may be deleted, or it may just be
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// ignored, at the server's discretion.
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actor_id_ = world_->create_login_actor();
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}
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// When the world is in synchronous mode, there's no
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// snapshot, and the commands in the unack queue are not
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// reflected in the world. In asynchronous mode, there is
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// a snapshot that allows return to the synchronous mode,
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// and the unack commands are in the world model.
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void world_to_synchronous() {
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if (!world_->snapshot_empty()) {
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world_->rollback();
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}
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}
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void world_to_asynchronous() {
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if (world_->snapshot_empty()) {
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world_->snapshot();
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for (const Invocation &inv : unack_) {
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world_->invoke(inv);
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}
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}
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}
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void abandon_server() {
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// Put the world model back into a known-good state.
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set_initial_state();
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// Disconnect from the server.
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channel_.reset();
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}
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virtual void event_init(int argc, char *argv[]) {
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// Put the world into the starting state.
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set_initial_state();
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// Establish a connection to the server.
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channel_ = new_outgoing_channel("localhost:8085");
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// Set the console prompt
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get_stdio_channel()->set_prompt(console_.get_prompt());
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}
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void send_invocation(const Invocation &inv) {
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if (channel_ == nullptr) {
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stdostream() << "Cannot invoke any actions, not connected." << std::endl;
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return;
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}
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world_to_asynchronous();
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world_->invoke(inv);
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unack_.push_back(inv);
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StreamBuffer *sb = channel_->out();
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sb->write_uint8(util::MSG_INVOKE);
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inv.serialize(sb);
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}
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void do_lua_command(const StringVec &words) {
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if (words.size() != 2) {
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stdostream() << "lua command (lua) takes a single string" << std::endl;
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return;
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}
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const std::string &exp = words[1];
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InvocationData dummyresult;
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Invocation inv(Invocation::KIND_LUA, actor_id_, actor_id_, exp, dummyresult);
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send_invocation(inv);
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}
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void do_syntax_command(const StringVec &words) {
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stdostream() << "Syntax Error: ";
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for (int i = 1; i < int(words.size()); i++) {
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stdostream() << words[i] << " ";
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}
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stdostream() << std::endl;
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}
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void do_view_command(const StringVec &cmd) {
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if (cmd.size() != 1) {
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stdostream() << "view command takes no arguments" << std::endl;
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return;
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}
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for (int64_t id : world_->get_near(actor_id_, 100, true)) {
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const Tangible *tan = world_->tangible_get(id);
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const AnimStep &aqback = tan->anim_queue_.back();
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stdostream() << id << ": " << aqback.graphic() << " " << aqback.plane() << " " << aqback.xyz().debug_string() << std::endl;
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}
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}
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void do_menu_command(const StringVec &cmd) {
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int64_t id;
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if (cmd.size() == 1) {
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id = actor_id_;
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} else if (cmd.size() == 2) {
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id = util::strtoint(cmd[1], -1);
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} else {
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stdostream() << "menu command expects a tangible ID or defaults to actor_id" << std::endl;
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return;
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}
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world_to_asynchronous();
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gui_place_ = id;
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world_->update_gui(actor_id_, id, &gui_);
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int index = 0;
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for (const GuiElt &elt : gui_.elts()) {
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stdostream() << index << " " << elt.label() << std::endl;
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index += 1;
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}
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}
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void do_choose_command(const StringVec &cmd) {
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int64_t index;
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if (cmd.size() == 1) {
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index = util::strtoint(cmd[0], -1);
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} else {
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stdostream() << "choose command consists of a single menu line number" << std::endl;
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return;
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}
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const Gui::EltVec &elts = gui_.elts();
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if ((index < 0) || (index >= int(elts.size()))) {
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stdostream() << "No menu item #" << index << std::endl;
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return;
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}
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std::string action = elts[index].action();
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stdostream() << "Invoking plan: " << action << std::endl;
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InvocationData dummyresult;
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dummyresult["flavor"] = "chocolate";
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dummyresult["color"] = "blue";
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Invocation inv(Invocation::KIND_PLAN, actor_id_, gui_place_, action, dummyresult);
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send_invocation(inv);
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}
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void do_quit_command(const util::StringVec &words) {
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if (words.size() != 1) {
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stdostream() << "quit command takes no arguments" << std::endl;
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return;
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}
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abandon_server();
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stop_driver();
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}
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void do_command(const util::StringVec &words) {
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if (words.empty()) return;
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else if (words[0] == "lua") do_lua_command(words);
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else if (words[0] == "syntax") do_syntax_command(words);
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else if (words[0] == "view") do_view_command(words);
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else if (words[0] == "menu") do_menu_command(words);
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else if (words[0] == "quit") do_quit_command(words);
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else if (util::validinteger(words[0])) do_choose_command(words);
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else {
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stdostream() << "Unknown command: " << words[0] << std::endl;
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}
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}
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void receive_ack_from_server(StreamBuffer *sb) {
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// An ack is just a single byte, so there's nothing left to read.
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if (unack_.empty()) {
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// Invalid acknowledgement when theres' nothing in the unack queue.
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abandon_server();
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return;
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}
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world_to_synchronous();
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world_->invoke(unack_.front());
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unack_.pop_front();
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}
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void receive_diff_from_server(StreamBuffer *sb) {
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world_to_synchronous();
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try {
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actor_id_ = world_->patch_everything(sb);
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} catch (const StreamEof &seof) {
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abandon_server();
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return;
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} catch (const StreamCorruption &scorr) {
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abandon_server();
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return;
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}
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}
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bool receive_message_from_server(StreamBuffer *sb) {
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if (sb->fill() < 5) return false;
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int64_t tr_before = sb->total_reads();
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uint8_t message_type = sb->read_uint8();
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uint32_t message_body_len = sb->read_uint32();
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if (sb->fill() < message_body_len) {
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sb->unread_to(tr_before);
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return false;
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}
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StreamBuffer body(sb->read_bytes(message_body_len), message_body_len);
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if (message_type == util::MSG_ACK) {
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receive_ack_from_server(&body);
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} else if (message_type == util::MSG_DIFF) {
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receive_diff_from_server(&body);
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} else {
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abandon_server();
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return false;
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}
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if (!body.empty()) {
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abandon_server();
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return false;
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}
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return true;
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}
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virtual void event_update() {
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// Check for keyboard input on stdin.
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while (true) {
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std::string line = get_stdio_channel()->in()->readline();
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if (line == "") break;
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console_.add(line);
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get_stdio_channel()->set_prompt(console_.get_prompt());
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do_command(console_.get_command());
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}
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// Check for communication from server..
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if (channel_ != nullptr) {
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if (channel_->closed()) {
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stdostream() << "Server closed connection " << channel_->error() << std::endl;
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abandon_server();
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} else {
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while (receive_message_from_server(channel_->in()));
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world_to_asynchronous();
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}
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}
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}
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};
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UniqueDrivenEngine make_LpxClient() {
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return UniqueDrivenEngine(new LpxClient);
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}
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