/*
- * Copyright (C) 2016, 2017 "IoT.bzh"
+ * Copyright (C) 2015-2020 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
#include <string.h>
#include <json-c/json.h>
-#define AFB_BINDING_VERSION 2
+#define AFB_BINDING_VERSION 3
#include <afb/afb-binding.h>
-/*
- * definition of waiters
- */
-struct waiter
-{
- struct waiter *next;
- struct afb_req req;
-};
+static const char SPACE = ' ';
+static const char CROSS = 'X';
+static const char ROUND = 'O';
+static const char NHERE = '+';
+static const int DEFLVL = 8;
/*
* definition of a board
int id;
int level;
char board[9];
- struct waiter *waiters;
+ afb_event_t event;
};
/*
struct board *board = calloc(1, sizeof *board);
/* initialisation */
- memset(board->board, ' ', sizeof board->board);
+ memset(board->board, SPACE, sizeof board->board);
board->use_count = 1;
- board->level = 1;
+ board->level = DEFLVL;
board->moves = 0;
do {
board->id = (rand() >> 2) % 1000;
} while(board->id == 0 || search_board(board->id) != NULL);
+ board->event = afb_daemon_make_event("board");
/* link */
board->next = all_boards;
/* decrease the reference count ... */
if (--board->use_count == 0) {
/* ... no more use */
+ afb_event_unref(board->event);
/* unlink from the list of boards */
struct board **prv = &all_boards;
while (*prv != NULL && *prv != board)
}
}
+/*
+ * Checks who wins
+ * Returns zero if there is no winner
+ * Returns the char of the winner if a player won
+ */
+static char wins(const char b[9], int first, int incr)
+{
+ char c = b[first];
+
+ return c != SPACE && b[first + incr] == c && b[first + incr + incr] == c ? c : 0;
+}
+
/*
* Checks who wins
* Returns zero if there is no winner
*/
static char winner(const char b[9])
{
- int i;
char c;
- /* check diagonals */
- c = b[4];
- if (c != ' ') {
- if (b[0] == c && b[8] == c)
- return c;
- if (b[2] == c && b[6] == c)
- return c;
- }
+ c = wins(b, 0, 1);
+ if (c)
+ return c;
- /* check lines */
- for (i = 0 ; i <= 6 ; i += 3) {
- c = b[i];
- if (c != ' ' && b[i+1] == c && b[i+2] == c)
- return c;
- }
+ c = wins(b, 3, 1);
+ if (c)
+ return c;
- /* check columns */
- for (i = 0 ; i <= 2 ; i++) {
- c = b[i];
- if (c != ' ' && b[i+3] == c && b[i+6] == c)
- return c;
- }
+ c = wins(b, 6, 1);
+ if (c)
+ return c;
+
+ c = wins(b, 0, 3);
+ if (c)
+ return c;
+
+ c = wins(b, 1, 3);
+ if (c)
+ return c;
+
+ c = wins(b, 2, 3);
+ if (c)
+ return c;
+
+ c = wins(b, 0, 4);
+ if (c)
+ return c;
+
+ c = wins(b, 2, 2);
+ if (c)
+ return c;
return 0;
}
/* get the color (X or 0) of the move of index 'move' */
static char color(int move)
{
- return (move & 1) == 0 ? 'X' : '0';
+ return (move & 1) == 0 ? CROSS : ROUND;
}
/* adds the move to the board */
static int get_random_move(char b[9])
{
int index = rand() % 9;
- while (b[index] != ' ')
+ while (b[index] != SPACE)
index = (index + 1) % 9;
return index;
}
*/
static int score_position(char b[9], char c, int depth)
{
- int i, t, r;
+ int i, s, nc, wc, lc;
/* check if winner */
if (winner(b) == c)
return 1;
/* when depth of analysis is reached return unknown case */
- if (--depth == 0)
+ if (--depth <= 0)
return 0;
/* switch to the opponent */
- c = (char)('O' + 'X' - c);
+ c = (char)(ROUND + CROSS - c);
/* inspect opponent moves */
- r = 1;
+ nc = wc = lc = 0;
for (i = 0 ; i < 9 ; i++) {
- if (b[i] == ' ') {
+ if (b[i] == SPACE) {
b[i] = c;
- t = score_position(b, c, depth);
- b[i] = ' ';
- if (t > 0)
- return -1; /* opponent will win */
-
- if (t == 0)
- r = 0; /* something not clear */
+ s = score_position(b, c, depth);
+ b[i] = SPACE;
+ if (s > 0)
+ lc++; /* opponent's victory, inc loose count */
+ else if (s < 0)
+ wc++; /* current's victory, inc win count */
+ else
+ nc++; /* none wins, increment null count */
}
}
- return r;
+ return lc ? -lc : wc;
}
/* get one move: return the computed index of the move */
static int get_move(struct board *board)
{
- int index, depth, t, f;
+ int index, depth, f, s, smax, imax;
char c;
char b[9];
/* depth and more */
memcpy(b, board->board, 9);
+ f = smax = 0;
c = color(board->moves);
- f = 0;
for (index = 0 ; index < 9 ; index++) {
- if (board->board[index] == ' ') {
+ if (board->board[index] == SPACE) {
board->board[index] = c;
- t = score_position(board->board, c, depth);
- board->board[index] = ' ';
- if (t > 0)
- return index;
- if (t < 0)
- b[index] = '+';
- else
+ s = score_position(board->board, c, depth);
+ board->board[index] = SPACE;
+ if (s < 0)
+ b[index] = NHERE;
+ else if (s <= smax)
f = 1;
+ else {
+ smax = s;
+ imax = index;
+ }
}
}
- return get_random_move(f ? b : board->board);
+ return smax ? imax : get_random_move(f ? b : board->board);
}
/*
*/
static void changed(struct board *board, const char *reason)
{
- struct waiter *waiter, *next;
- struct json_object *description;
-
- /* get the description */
- description = describe(board);
+ afb_event_push(board->event, json_object_new_string(reason));
+}
- waiter = board->waiters;
- board->waiters = NULL;
- while (waiter != NULL) {
- next = waiter->next;
- afb_req_success(waiter->req, json_object_get(description), reason);
- afb_req_unref(waiter->req);
- free(waiter);
- waiter = next;
- }
+static void *get_new_board_cb(void *closure)
+{
+ afb_req_t req = closure;
+ struct board *board = get_new_board();
+ afb_req_subscribe(req, board->event);
+ return board;
+}
- afb_daemon_broadcast_event(reason, description);
+static void release_board_cb(void *closure)
+{
+ struct board *board = closure;
+ return release_board(board);
}
/*
* retrieves the board of the request
*/
-static inline struct board *board_of_req(struct afb_req req)
+static inline struct board *board_of_req(afb_req_t req)
{
- return afb_req_context(req, (void*)get_new_board, (void*)release_board);
+ return afb_req_context(req, 0, get_new_board_cb, release_board_cb, req);
}
/*
* start a new game
*/
-static void new(struct afb_req req)
+static void new(afb_req_t req)
{
struct board *board;
AFB_INFO("method 'new' called for boardid %d", board->id);
/* reset the game */
- memset(board->board, ' ', sizeof board->board);
+ memset(board->board, SPACE, sizeof board->board);
board->moves = 0;
/* replies */
/*
* get the board
*/
-static void board(struct afb_req req)
+static void board(afb_req_t req)
{
struct board *board;
struct json_object *description;
/*
* move a piece
*/
-static void move(struct afb_req req)
+static void move(afb_req_t req)
{
struct board *board;
int i;
}
/* checks validity of the move */
- if (board->board[i] != ' ') {
+ if (board->board[i] != SPACE) {
AFB_WARNING("can't move to %s: room occupied", index);
afb_req_fail(req, "error", "occupied");
return;
/*
* set the level
*/
-static void level(struct afb_req req)
+static void level(afb_req_t req)
{
struct board *board;
int l;
/*
* Join a board
*/
-static void join(struct afb_req req)
+static void join(afb_req_t req)
{
struct board *board, *new_board;
const char *id;
/* none is a special id for joining a new session */
if (strcmp(id, "none") == 0) {
new_board = get_new_board();
- goto success;
+ goto setctx;
}
/* searchs the board to join */
* function 'release_board'. So the use_count MUST not
* be incremented.
*/
- if (new_board != board)
- new_board->use_count++;
+ if (new_board == board)
+ goto success;
-success:
+ new_board->use_count++;
+setctx:
/* set the new board (and leaves the previous one) */
- afb_req_context_set(req, new_board, (void*)release_board);
+ afb_req_unsubscribe(req, board->event);
+ afb_req_context(req, 1, NULL, release_board_cb, new_board);
+ afb_req_subscribe(req, new_board->event);
+success:
/* replies */
afb_req_success(req, NULL, NULL);
return;
/*
* Undo the last move
*/
-static void undo(struct afb_req req)
+static void undo(afb_req_t req)
{
struct board *board;
int i;
/* undo the last move */
i = board->history[--board->moves];
- board->board[i] = ' ';
+ board->board[i] = SPACE;
/* replies */
afb_req_success(req, NULL, NULL);
/*
* computer plays
*/
-static void play(struct afb_req req)
+static void play(afb_req_t req)
{
struct board *board;
int index;
changed(board, "play");
}
-static void wait(struct afb_req req)
-{
- struct board *board;
- struct waiter *waiter;
-
- /* retrieves the context for the session */
- board = board_of_req(req);
- AFB_INFO("method 'wait' called for boardid %d", board->id);
-
- /* creates the waiter and enqueues it */
- waiter = calloc(1, sizeof *waiter);
- waiter->req = req;
- waiter->next = board->waiters;
- afb_req_addref(req);
- board->waiters = waiter;
-}
-
/*
* array of the verbs exported to afb-daemon
*/
-static const struct afb_verb_v2 verbs[] = {
+static const afb_verb_t verbs[] = {
{ .verb="new", .callback=new },
{ .verb="play", .callback=play },
{ .verb="move", .callback=move },
{ .verb="level", .callback=level },
{ .verb="join", .callback=join },
{ .verb="undo", .callback=undo },
- { .verb="wait", .callback=wait },
{ .verb=NULL }
};
/*
* description of the binding for afb-daemon
*/
-const afb_binding_v2 afbBindingV2 = {
+const afb_binding_t afbBindingV3 = {
.api = "tictactoe",
.specification = NULL,
- .verbs = verbs
+ .verbs = verbs,
+ .noconcurrency = 1
};
Code Review / src / app-framework-binder.git / blobdiff