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第三章

Nginx Http模块调用简化流程:

ngx_int_t 的封装:

typedef intptr_t ngx_int_t;
typedef uintptr_t ngx_uint_t;

ngx_str_t 数据结构:

typedef struct {
    size_t len;
    u_char *data;
} ngx_str_t;

// 字符串对比函数
#define ngx_strncmp(s1, s2, n) strncmp((const char *) s1, (const char *) s2, n);

ngx_list_t 数据结构:

typedef struct ngx_list_part_s ngx_list_part_t;
struct ngx_list_part_s {
    void            *elts;
    ngx_uint_t      nelts;
    ngx_list_part_t *next;
}
typedef struct {
    ngx_list_part_t    *last;
    ngx_list_part_t    part;
    size_t             size;
    ngx_uint_t         nalloc;
    ngx_pool_t         *pool;
} ngx_list_t;

ngx_list_t内存分布:

ngx_list_t相关函数:

//用于创建新链表
ngx_list_t *ngx_list_create(ngx_pool_t *pool, ngx_uint_t n, size_t size);
//用于初使化一个已有链表
static ngx_inline ngx_int_t ngx_list_init(ngx_list_t *list, ngx_pool_t *pool, ngx_uint_t n, size_t size);
//用于添加新元素
void *ngx_list_push(ngx_list_t *list);

ngx_table_elt_t 数据结构(为http头部量身定制):

typedef struct {
    ngx_uint_t      hash;
    ngx_str_t       key;
    ngx_str_t       value;
    u_char          *lowcase_key;
} ngx_table_elt_t;

ngx_buf_t 数据结构:

typedef struct ngx_buf_s ngx_buf_t;
typedef void* ngx_buf_tag_t;
struct ngx_buf_s {
    u_char      *pos;
    u_char      *last;
    off_t       file_pos;
    off_t       file_last;

    u_char      *start;
    u_char      *end;
    ngx_buf_tag_t   tag;
    ngx_file_t      *file;

    ngx_buf_t       *shadow;

    unsigned     temporary:1;    // 临时内存标志位
    unsigned     memory:1;      //标志位
    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;
}

ngx_chain_t 数据结构:

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

如何将自己的nginx模块编译进Nginx

config文件的写法:

ngx_addon_name=<ngx_http_mytest_module>
HTTP_MODULES="$HTTP_MODULES <ngx_http_mytest_module>";
NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_mytest_module.c"

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