Mongoose源码剖析：数据结构篇

struct mg_context {
	int		stop_flag;	/* Should we stop event loop	*/
	SSL_CTX		*ssl_ctx;	/* SSL context			*/

	FILE		*access_log;	/* Opened access log		*/
	FILE		*error_log;	/* Opened error log		*/

	struct socket	listeners[MAX_LISTENING_SOCKETS];
	int		num_listeners;

	struct callback	callbacks[MAX_CALLBACKS];
	int		num_callbacks;

	char		*options[NUM_OPTIONS];	/* Configured opions	*/
	pthread_mutex_t	opt_mutex[NUM_OPTIONS];	/* Option protector	*/

	int		max_threads;	/* Maximum number of threads	*/
	int		num_threads;	/* Number of threads		*/
	int		num_idle;	/* Number of idle threads	*/
	pthread_mutex_t	thr_mutex;	/* Protects (max|num)_threads	*/
	pthread_cond_t	thr_cond;
	pthread_mutex_t	bind_mutex;	/* Protects bind operations	*/

	struct socket	queue[20];	/* Accepted sockets		*/
	int		sq_head;	/* Head of the socket queue	*/
	int		sq_tail;	/* Tail of the socket queue	*/
	pthread_cond_t	empty_cond;	/* Socket queue empty condvar	*/
	pthread_cond_t	full_cond;	/* Socket queue full condvar	*/

	mg_spcb_t	ssl_password_callback;
	mg_callback_t	log_callback;
};

/*
 * Register SSL password handler.
 * This is needed only if SSL certificate asks for a password. Instead of
 * prompting for a password on a console a specified function will be called.
 */
typedef int (*mg_spcb_t)(char *buf, int num, int w, void *key);

/*
 * User-defined callback function prototype for URI handling, error handling,
 * or logging server messages.
 */
typedef void (*mg_callback_t)(struct mg_connection *,
		const struct mg_request_info *info, void *user_data);

/*
 * Client connection.
 */
struct mg_connection {
	struct mg_request_info	request_info;
	struct mg_context *ctx;		/* Mongoose context we belong to*/
	SSL		*ssl;		/* SSL descriptor		*/
	struct socket	client;		/* Connected client		*/
	time_t		birth_time;	/* Time connection was accepted	*/
	bool_t		free_post_data;	/* post_data was malloc-ed	*/
	bool_t		embedded_auth;	/* Used for authorization	*/
	uint64_t	num_bytes_sent;	/* Total bytes sent to client	*/
};

/*
 * This structure contains full information about the HTTP request.
 * It is passed to the user-specified callback function as a parameter.
 */
struct mg_request_info {
	char	*request_method;	/* "GET", "POST", etc	*/
	char	*uri;			/* Normalized URI	*/
	char	*query_string;		/* \0 - terminated	*/
	char	*post_data;		/* POST data buffer	*/
	char	*remote_user;		/* Authenticated user	*/
	long	remote_ip;		/* Client's IP address	*/
	int	remote_port;		/* Client's port	*/
	int	post_data_len;		/* POST buffer length	*/
	int	http_version_major;
	int	http_version_minor;
	int	status_code;		/* HTTP status code	*/
	int	num_headers;		/* Number of headers	*/
	struct mg_header {
		char	*name;		/* HTTP header name	*/
		char	*value;		/* HTTP header value	*/
	} http_headers[64];		/* Maximum 64 headers	*/
};

/*
 * Structure used by mg_stat() function. Uses 64 bit file length.
 */
struct mgstat {
	bool_t		is_directory;	/* Directory marker		*/
	uint64_t	size;		/* File size			*/
	time_t		mtime;		/* Modification time		*/
};

struct mg_option {
	const char	*name;
	const char	*description;
	const char	*default_value;
	int		index;
	bool_t (*setter)(struct mg_context *, const char *);
};
/*
 * Structure used to describe listening socket, or socket which was
 * accept()-ed by the master thread and queued for future handling
 * by the worker thread.
 */
struct socket {
	SOCKET		sock;		/* Listening socket		*/
	struct usa	lsa;		/* Local socket address		*/
	struct usa	rsa;		/* Remote socket address	*/
	bool_t		is_ssl;		/* Is socket SSL-ed		*/
};
/*
 * Unified socket address. For IPv6 support, add IPv6 address structure
 * in the union u.
 */
struct usa {
	socklen_t len;
	union {
		struct sockaddr	sa;
		struct sockaddr_in sin;
	} u;
};

/*
 * Specifies a string (chunk of memory).
 * Used to traverse comma separated lists of options.
 */
struct vec {
	const char	*ptr;
	size_t		len;
};
/*
 * Dynamically loaded SSL functionality
 */
struct ssl_func {
	const char	*name;		/* SSL function name	*/
	void		(*ptr)(void);	/* Function pointer	*/
};