/*
* Copyright (C) NGINX, Inc.
*/
#ifndef _NXT_UNIT_H_INCLUDED_
#define _NXT_UNIT_H_INCLUDED_
#include <inttypes.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <string.h>
#include "nxt_version.h"
#include "nxt_unit_typedefs.h"
enum {
NXT_UNIT_OK = 0,
NXT_UNIT_ERROR = 1,
};
enum {
NXT_UNIT_LOG_ALERT = 0,
NXT_UNIT_LOG_ERR = 1,
NXT_UNIT_LOG_WARN = 2,
NXT_UNIT_LOG_NOTICE = 3,
NXT_UNIT_LOG_INFO = 4,
NXT_UNIT_LOG_DEBUG = 5,
};
#define NXT_UNIT_INIT_ENV "NXT_UNIT_INIT"
/*
* Mostly opaque structure with library state.
*
* Only user defined 'data' pointer exposed here. The rest is unit
* implementation specific and hidden.
*/
struct nxt_unit_s {
void *data; /* User defined data. */
};
/*
* Thread context.
*
* First (main) context is provided 'for free'. To receive and process
* requests in other thread, one need to allocate context and use it
* further in this thread.
*/
struct nxt_unit_ctx_s {
void *data; /* User context-specific data. */
nxt_unit_t *unit;
};
/*
* Unit port identification structure.
*
* Each port can be uniquely identified by listen process id (pid) and port id.
* This identification is required to refer the port from different process.
*/
struct nxt_unit_port_id_s {
pid_t pid;
uint32_t hash;
uint16_t id;
};
/*
* unit provides port storage which is able to store and find the following
* data structures.
*/
struct nxt_unit_port_s {
nxt_unit_port_id_t id;
int in_fd;
int out_fd;
void *data;
};
struct nxt_unit_buf_s {
char *start;
char *free;
char *end;
};
struct nxt_unit_request_info_s {
nxt_unit_t *unit;
nxt_unit_ctx_t *ctx;
nxt_unit_port_id_t request_port;
nxt_unit_port_id_t response_port;
nxt_unit_request_t *request;
nxt_unit_buf_t *request_buf;
nxt_unit_response_t *response;
nxt_unit_buf_t *response_buf;
uint32_t response_max_fields;
nxt_unit_buf_t *content_buf;
uint64_t content_length;
void *data;
};
/*
* Set of application-specific callbacks. Application may leave all optional
* callbacks as NULL.
*/
struct nxt_unit_callbacks_s {
/*
* Process request. Unlike all other callback, this callback
* need to be defined by application.
*/
void (*request_handler)(nxt_unit_request_info_t *req);
/* Process websocket frame. */
void (*websocket_handler)(nxt_unit_websocket_frame_t *ws);
/* Connection closed. */
void (*close_handler)(nxt_unit_request_info_t *req);
/* Add new Unit port to communicate with process pid. Optional. */
int (*add_port)(nxt_unit_ctx_t *, nxt_unit_port_t *port);
/* Remove previously added port. Optional. */
void (*remove_port)(nxt_unit_ctx_t *, nxt_unit_port_id_t *port_id);
/* Remove all data associated with process pid including ports. Optional. */
void (*remove_pid)(nxt_unit_ctx_t *, pid_t pid);
/* Gracefully quit the application. Optional. */
void (*quit)(nxt_unit_ctx_t *);
/* Send data and control to process pid using port id. Optional. */
ssize_t (*port_send)(nxt_unit_ctx_t *, nxt_unit_port_id_t *port_id,
const void *buf, size_t buf_size,
const void *oob, size_t oob_size);
/* Receive data on port id. Optional. */
ssize_t (*port_recv)(nxt_unit_ctx_t *, nxt_unit_port_id_t *port_id,
void *buf, size_t buf_size, void *oob, size_t oob_size);
};
struct nxt_unit_init_s {
void *data; /* Opaque pointer to user-defined data. */
void *ctx_data; /* Opaque pointer to user-defined data. */
int max_pending_requests;
uint32_t request_data_size;
uint32_t shm_limit;
nxt_unit_callbacks_t callbacks;
nxt_unit_port_t ready_port;
uint32_t ready_stream;
nxt_unit_port_t read_port;
int log_fd;
};
typedef ssize_t (*nxt_unit_read_func_t)(nxt_unit_read_info_t *read_info,
void *dst, size_t size);
struct nxt_unit_read_info_s {
nxt_unit_read_func_t read;
int eof;
uint32_t buf_size;
void *data;
};
/*
* Initialize Unit application library with necessary callbacks and
* ready/reply port parameters, send 'READY' response to master.
*/
nxt_unit_ctx_t *nxt_unit_init(nxt_unit_init_t *);
/*
* Process received message, invoke configured callbacks.
*
* If application implements it's own event loop, each datagram received
* from port socket should be initially processed by unit. This function
* may invoke other application-defined callback for message processing.
*/
int nxt_unit_process_msg(nxt_unit_ctx_t *, nxt_unit_port_id_t *port_id,
void *buf, size_t buf_size, void *oob, size_t oob_size);
/*
* Main function useful in case when application does not have it's own
* event loop. nxt_unit_run() starts infinite message wait and process loop.
*
* for (;;) {
* app_lib->port_recv(...);
* nxt_unit_process_msg(...);
* }
*
* The normally function returns when QUIT message received from Unit.
*/
int nxt_unit_run(nxt_unit_ctx_t *);
int nxt_unit_run_once(nxt_unit_ctx_t *ctx);
/* Destroy application library object. */
void nxt_unit_done(nxt_unit_ctx_t *);
/*
* Allocate and initialize new execution context with new listen port to
* process requests in other thread.
*/
nxt_unit_ctx_t *nxt_unit_ctx_alloc(nxt_unit_ctx_t *, void *);
/* Free unused context. It is not required to free main context. */
void nxt_unit_ctx_free(nxt_unit_ctx_t *);
/* Initialize port_id, calculate hash. */
void nxt_unit_port_id_init(nxt_unit_port_id_t *port_id, pid_t pid, uint16_t id);
/*
* Create extra incoming port, perform all required actions to propogate
* the port to Unit server. Fills structure referenced by port_id with
* current pid and new port id.
*/
int nxt_unit_create_send_port(nxt_unit_ctx_t *, nxt_unit_port_id_t *dst,
nxt_unit_port_id_t *port_id);
/* Default 'add_port' implementation. */
int nxt_unit_add_port(nxt_unit_ctx_t *, nxt_unit_port_t *port);
/* Find previously added port. */
nxt_unit_port_t *nxt_unit_find_port(nxt_unit_ctx_t *,
nxt_unit_port_id_t *port_id);
/* Find, fill output 'port' and remove port from storage. */
void nxt_unit_find_remove_port(nxt_unit_ctx_t *, nxt_unit_port_id_t *port_id,
nxt_unit_port_t *port);
/* Default 'remove_port' implementation. */
void nxt_unit_remove_port(nxt_unit_ctx_t *, nxt_unit_port_id_t *port_id);
/* Default 'remove_pid' implementation. */
void nxt_unit_remove_pid(nxt_unit_ctx_t *, pid_t pid);
/* Default 'quit' implementation. */
void nxt_unit_quit(nxt_unit_ctx_t *);
/* Default 'port_send' implementation. */
ssize_t nxt_unit_port_send(nxt_unit_ctx_t *, int fd,
const void *buf, size_t buf_size,
const void *oob, size_t oob_size);
/* Default 'port_recv' implementation. */
ssize_t nxt_unit_port_recv(nxt_unit_ctx_t *, int fd, void *buf, size_t buf_size,
void *oob, size_t oob_size);
/* Calculates hash for given field name. */
uint16_t nxt_unit_field_hash(const char* name, size_t name_length);
/* Split host for server name and port. */
void nxt_unit_split_host(char *host_start, uint32_t host_length,
char **name, uint32_t *name_length, char **port, uint32_t *port_length);
/* Group duplicate fields for easy enumeration. */
void nxt_unit_request_group_dup_fields(nxt_unit_request_info_t *req);
/*
* Allocate response structure capable to store limited numer of fields.
* The structure may be accessed directly via req->response pointer or
* filled step-by-step using functions add_field and add_content.
*/
int nxt_unit_response_init(nxt_unit_request_info_t *req,
uint16_t status, uint32_t max_fields_count, uint32_t max_fields_size);
int nxt_unit_response_realloc(nxt_unit_request_info_t *req,
uint32_t max_fields_count, uint32_t max_fields_size);
int nxt_unit_response_is_init(nxt_unit_request_info_t *req);
int nxt_unit_response_add_field(nxt_unit_request_info_t *req,
const char* name, uint8_t name_length,
const char* value, uint32_t value_length);
int nxt_unit_response_add_content(nxt_unit_request_info_t *req,
const void* src, uint32_t size);
/*
* Send prepared response to Unit server. Response structure destroyed during
* this call.
*/
int nxt_unit_response_send(nxt_unit_request_info_t *req);
int nxt_unit_response_is_sent(nxt_unit_request_info_t *req);
nxt_unit_buf_t *nxt_unit_response_buf_alloc(nxt_unit_request_info_t *req,
uint32_t size);
int nxt_unit_request_is_websocket_handshake(nxt_unit_request_info_t *req);
int nxt_unit_response_upgrade(nxt_unit_request_info_t *req);
int nxt_unit_response_is_websocket(nxt_unit_request_info_t *req);
nxt_unit_request_info_t *nxt_unit_get_request_info_from_data(void *data);
int nxt_unit_buf_send(nxt_unit_buf_t *buf);
void nxt_unit_buf_free(nxt_unit_buf_t *buf);
nxt_unit_buf_t *nxt_unit_buf_next(nxt_unit_buf_t *buf);
uint32_t nxt_unit_buf_max(void);
uint32_t nxt_unit_buf_min(void);
int nxt_unit_response_write(nxt_unit_request_info_t *req, const void *start,
size_t size);
int nxt_unit_response_write_cb(nxt_unit_request_info_t *req,
nxt_unit_read_info_t *read_info);
ssize_t nxt_unit_request_read(nxt_unit_request_info_t *req, void *dst,
size_t size);
void nxt_unit_request_done(nxt_unit_request_info_t *req, int rc);
int nxt_unit_websocket_send(nxt_unit_request_info_t *req, uint8_t opcode,
uint8_t last, const void *start, size_t size);
int nxt_unit_websocket_sendv(nxt_unit_request_info_t *req, uint8_t opcode,
uint8_t last, const struct iovec *iov, int iovcnt);
ssize_t nxt_unit_websocket_read(nxt_unit_websocket_frame_t *ws, void *dst,
size_t size);
int nxt_unit_websocket_retain(nxt_unit_websocket_frame_t *ws);
void nxt_unit_websocket_done(nxt_unit_websocket_frame_t *ws);
void nxt_unit_log(nxt_unit_ctx_t *ctx, int level, const char* fmt, ...);
void nxt_unit_req_log(nxt_unit_request_info_t *req, int level,
const char* fmt, ...);
#if (NXT_DEBUG)
#define nxt_unit_debug(ctx, fmt, ARGS...) \
nxt_unit_log(ctx, NXT_UNIT_LOG_DEBUG, fmt, ##ARGS)
#define nxt_unit_req_debug(req, fmt, ARGS...) \
nxt_unit_req_log(req, NXT_UNIT_LOG_DEBUG, fmt, ##ARGS)
#else
#define nxt_unit_debug(ctx, fmt, ARGS...)
#define nxt_unit_req_debug(req, fmt, ARGS...)
#endif
#define nxt_unit_warn(ctx, fmt, ARGS...) \
nxt_unit_log(ctx, NXT_UNIT_LOG_WARN, fmt, ##ARGS)
#define nxt_unit_req_warn(req, fmt, ARGS...) \
nxt_unit_req_log(req, NXT_UNIT_LOG_WARN, fmt, ##ARGS)
#define nxt_unit_error(ctx, fmt, ARGS...) \
nxt_unit_log(ctx, NXT_UNIT_LOG_ERR, fmt, ##ARGS)
#define nxt_unit_req_error(req, fmt, ARGS...) \
nxt_unit_req_log(req, NXT_UNIT_LOG_ERR, fmt, ##ARGS)
#define nxt_unit_alert(ctx, fmt, ARGS...) \
nxt_unit_log(ctx, NXT_UNIT_LOG_ALERT, fmt, ##ARGS)
#define nxt_unit_req_alert(req, fmt, ARGS...) \
nxt_unit_req_log(req, NXT_UNIT_LOG_ALERT, fmt, ##ARGS)
#endif /* _NXT_UNIT_H_INCLUDED_ */
