nginx 日志模块

ngx_http_log_module.c

数据结构

typedef struct {
void **main_conf;
void **srv_conf;
void **loc_conf;
} ngx_http_conf_ctx_t;

typedef struct ngx_http_log_op_s ngx_http_log_op_t;

typedef u_char *(*ngx_http_log_op_run_pt) (ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);

typedef size_t (*ngx_http_log_op_getlen_pt) (ngx_http_request_t *r,
uintptr_t data);

struct ngx_http_log_op_s {
size_t len;
ngx_http_log_op_getlen_pt getlen;
ngx_http_log_op_run_pt run;
uintptr_t data;
};

typedef struct {
ngx_str_t name;
ngx_array_t *flushes;
ngx_array_t *ops; /* array of ngx_http_log_op_t */
} ngx_http_log_fmt_t;

typedef struct {
ngx_array_t formats; /* array of ngx_http_log_fmt_t */
ngx_uint_t combined_used; /* unsigned combined_used:1 */
} ngx_http_log_main_conf_t;

typedef struct {
u_char *start;
u_char *pos;
u_char *last;

ngx_event_t *event;
ngx_msec_t flush;
ngx_int_t gzip;
} ngx_http_log_buf_t;

typedef struct {
ngx_array_t *lengths;
ngx_array_t *values;
} ngx_http_log_script_t;

typedef struct {
ngx_open_file_t *file;
ngx_http_log_script_t *script;
time_t disk_full_time;
time_t error_log_time;
ngx_http_log_fmt_t *format;
} ngx_http_log_t;

typedef struct {
ngx_array_t *logs; /* array of ngx_http_log_t */

ngx_open_file_cache_t *open_file_cache;
time_t open_file_cache_valid;
ngx_uint_t open_file_cache_min_uses;

ngx_uint_t off; /* unsigned off:1 */
} ngx_http_log_loc_conf_t;

typedef struct {
ngx_str_t name;
size_t len;
ngx_http_log_op_run_pt run;
} ngx_http_log_var_t;

typedef struct {
ngx_str_t name;
void *(*create_conf)(ngx_cycle_t *cycle);
char *(*init_conf)(ngx_cycle_t *cycle, void *conf);
} ngx_core_module_t;

typedef struct {
ngx_int_t (*preconfiguration)(ngx_conf_t *cf);
ngx_int_t (*postconfiguration)(ngx_conf_t *cf);

void *(*create_main_conf)(ngx_conf_t *cf);
char *(*init_main_conf)(ngx_conf_t *cf, void *conf);

void *(*create_srv_conf)(ngx_conf_t *cf); char *(*merge_srv_conf)(ngx_conf_t *cf, void *prev, void *conf);

void *(*create_loc_conf)(ngx_conf_t *cf);
char *(*merge_loc_conf)(ngx_conf_t *cf, void *prev, void *conf);
} ngx_http_module_t;

static ngx_http_module_t ngx_http_log_module_ctx = {
NULL, /* preconfiguration */
ngx_http_log_init, /* postconfiguration */

ngx_http_log_create_main_conf, /* create main configuration */
NULL, /* init main configuration */

NULL, /* create server configuration */
NULL, /* merge server configuration */

ngx_http_log_create_loc_conf, /* create location configuration */
ngx_http_log_merge_loc_conf /* merge location configuration */
};

#define NGX_MODULE_V1 0, 0, 0, 0, 0, 0, 1
#define NGX_MODULE_V1_PADDING 0, 0, 0, 0, 0, 0, 0, 0

struct ngx_module_s {
ngx_uint_t ctx_index;
ngx_uint_t index;

ngx_uint_t spare0;
ngx_uint_t spare1;
ngx_uint_t spare2;
ngx_uint_t spare3;

ngx_uint_t version;

void *ctx;
ngx_command_t *commands;
ngx_uint_t type;

ngx_int_t (*init_master)(ngx_log_t *log);
ngx_int_t (*init_module)(ngx_cycle_t *cycle);

ngx_int_t (*init_process)(ngx_cycle_t *cycle);
ngx_int_t (*init_thread)(ngx_cycle_t *cycle);
void (*exit_thread)(ngx_cycle_t *cycle);
void (*exit_process)(ngx_cycle_t *cycle);

void (*exit_master)(ngx_cycle_t *cycle);

uintptr_t spare_hook0;
uintptr_t spare_hook1;
uintptr_t spare_hook2;
uintptr_t spare_hook3;
uintptr_t spare_hook4;
uintptr_t spare_hook5;
uintptr_t spare_hook6;
uintptr_t spare_hook7;
};

struct ngx_command_s {
ngx_str_t name;
ngx_uint_t type;
char *(*set)(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
ngx_uint_t conf;
ngx_uint_t offset;
void *post;
};

http:

typedef struct {
ngx_array_t servers; /* ngx_http_core_srv_conf_t */

ngx_http_phase_engine_t phase_engine;

ngx_hash_t headers_in_hash;

ngx_hash_t variables_hash;
ngx_array_t variables; /* ngx_http_variable_t */ ngx_uint_t ncaptures;

ngx_uint_t server_names_hash_max_size;
ngx_uint_t server_names_hash_bucket_size;

ngx_uint_t variables_hash_max_size; ngx_uint_t variables_hash_bucket_size;

ngx_hash_keys_arrays_t *variables_keys;

ngx_array_t *ports;
ngx_uint_t try_files; /* unsigned try_files:1 */

ngx_http_phase_t phases[NGX_HTTP_LOG_PHASE + 1];
} ngx_http_core_main_conf_t;

typedef struct {
unsigned len:28;

unsigned valid:1;
unsigned no_cacheable:1;
unsigned not_found:1;
unsigned escape:1;

u_char *data;
} ngx_variable_value_t;

struct ngx_buf_s {
u_char *pos;
u_char *last;
off_t file_pos;
off_t file_last;

u_char *start; /* start of buffer */
u_char *end; /* end of buffer */ ngx_buf_tag_t tag;
ngx_file_t *file;
ngx_buf_t *shadow;

/* the buf's content could be changed */
unsigned temporary:1;

/*
* the buf's content is in a memory cache or in a read only memory
* and must not be changed
*/
unsigned memory:1;

/* the buf's content is mmap()ed and must not be changed */
unsigned mmap:1;

unsigned recycled:1;
unsigned in_file:1;
unsigned flush:1;
unsigned sync:1;
unsigned last_buf:1;
unsigned last_in_chain:1;

unsigned last_shadow:1;
unsigned temp_file:1;

/* STUB */ int num;
};

struct ngx_chain_s {
ngx_buf_t *buf;
ngx_chain_t *next;
};