lua-nginx-module/src/ngx_http_lua_script.c at master · openresty/lua-nginx-module · GitHub

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* Copyright (C) Yichun Zhang (agentzh)

#ifndef DDEBUG

#define DDEBUG 0

#endif

#include "ddebug.h"

#include "ngx_http_lua_script.h"

static void *ngx_http_lua_script_add_code(ngx_array_t *codes, size_t size);

static size_t ngx_http_lua_script_copy_len_code(

ngx_http_lua_script_engine_t *e);

static void ngx_http_lua_script_copy_code(ngx_http_lua_script_engine_t *e);

static ngx_int_t ngx_http_lua_script_add_copy_code(

ngx_http_lua_script_compile_t *sc, ngx_str_t *value, ngx_uint_t last);

static ngx_int_t ngx_http_lua_script_compile(ngx_http_lua_script_compile_t *sc);

static ngx_int_t ngx_http_lua_script_add_capture_code(

ngx_http_lua_script_compile_t *sc, ngx_uint_t n);

static size_t ngx_http_lua_script_copy_capture_len_code(

ngx_http_lua_script_engine_t *e);

static void ngx_http_lua_script_copy_capture_code(

ngx_http_lua_script_engine_t *e);

static ngx_int_t ngx_http_lua_script_done(ngx_http_lua_script_compile_t *sc);

static ngx_int_t ngx_http_lua_script_init_arrays(

ngx_http_lua_script_compile_t *sc);

ngx_int_t

ngx_http_lua_compile_complex_value(ngx_http_lua_compile_complex_value_t *ccv)

{

ngx_str_t *v;

ngx_uint_t i, n, nv;

ngx_array_t lengths, values, *pl, *pv;

ngx_http_lua_script_compile_t sc;

v = ccv->value;

nv = 0;

for (i = 0; i < v->len; i++) {

if (v->data[i] == '$') {

nv++;

}

ccv->complex_value->value = *v;

ccv->complex_value->lengths = NULL;

ccv->complex_value->values = NULL;

if (nv == 0) {

return NGX_OK;

}

n = nv * (2 * sizeof(ngx_http_lua_script_copy_code_t)

+ sizeof(ngx_http_lua_script_capture_code_t))

+ sizeof(uintptr_t);

if (ngx_array_init(&lengths, ccv->pool, n, 1) != NGX_OK) {

return NGX_ERROR;

}

n = (nv * (2 * sizeof(ngx_http_lua_script_copy_code_t)

+ sizeof(ngx_http_lua_script_capture_code_t))

+ sizeof(uintptr_t)

+ sizeof(uintptr_t) - 1)

& ~(sizeof(uintptr_t) - 1);

if (ngx_array_init(&values, ccv->pool, n, 1) != NGX_OK) {

return NGX_ERROR;

}

pl = &lengths;

pv = &values;

ngx_memzero(&sc, sizeof(ngx_http_lua_script_compile_t));

sc.pool = ccv->pool;

sc.log = ccv->log;

sc.source = v;

sc.lengths = &pl;

sc.values = &pv;

sc.complete_lengths = 1;

sc.complete_values = 1;

if (ngx_http_lua_script_compile(&sc) != NGX_OK) {

ngx_array_destroy(&lengths);

ngx_array_destroy(&values);

return NGX_ERROR;

}

ccv->complex_value->lengths = lengths.elts;

ccv->complex_value->values = values.elts;

return NGX_OK;

}

ngx_int_t

ngx_http_lua_complex_value(ngx_http_request_t *r, ngx_str_t *subj,

size_t offset, ngx_int_t count, int *cap,

ngx_http_lua_complex_value_t *val, luaL_Buffer *luabuf)

{

size_t len;

u_char *p;

ngx_http_lua_script_code_pt code;

ngx_http_lua_script_len_code_pt lcode;

ngx_http_lua_script_engine_t e;

if (val->lengths == NULL) {

luaL_addlstring(luabuf, (char *) &subj->data[offset], cap[0] - offset);

luaL_addlstring(luabuf, (char *) val->value.data, val->value.len);

return NGX_OK;

}

ngx_memzero(&e, sizeof(ngx_http_lua_script_engine_t));

e.log = r->connection->log;

e.ncaptures = count * 2;

e.captures = cap;

e.captures_data = subj->data;

e.ip = val->lengths;

len = 0;

while (*(uintptr_t *) e.ip) {

lcode = *(ngx_http_lua_script_len_code_pt *) e.ip;

len += lcode(&e);

}

p = ngx_pnalloc(r->pool, len);

if (p == NULL) {

return NGX_ERROR;

}

e.ip = val->values;

e.pos = p;

while (*(uintptr_t *) e.ip) {

code = *(ngx_http_lua_script_code_pt *) e.ip;

code((ngx_http_lua_script_engine_t *) &e);

}

luaL_addlstring(luabuf, (char *) &subj->data[offset], cap[0] - offset);

luaL_addlstring(luabuf, (char *) p, len);

ngx_pfree(r->pool, p);

return NGX_OK;

}

static ngx_int_t

ngx_http_lua_script_compile(ngx_http_lua_script_compile_t *sc)

{

u_char ch;

ngx_str_t name;

ngx_uint_t i, bracket;

unsigned num_var;

ngx_uint_t n = 0;

if (ngx_http_lua_script_init_arrays(sc) != NGX_OK) {

return NGX_ERROR;

}

for (i = 0; i < sc->source->len; /* void */ ) {

name.len = 0;

if (sc->source->data[i] == '$') {

if (++i == sc->source->len) {

goto invalid_variable;

}

if (sc->source->data[i] == '$') {

name.data = &sc->source->data[i];

i++;

name.len++;

if (ngx_http_lua_script_add_copy_code(sc, &name,

(i == sc->source->len))

!= NGX_OK)

{

return NGX_ERROR;

}

continue;

}

if (sc->source->data[i] >= '0' && sc->source->data[i] <= '9') {

num_var = 1;

n = 0;

} else {

num_var = 0;

}

if (sc->source->data[i] == '{') {

bracket = 1;

if (++i == sc->source->len) {

goto invalid_variable;

}

if (sc->source->data[i] >= '0' && sc->source->data[i] <= '9') {

num_var = 1;

n = 0;

}

name.data = &sc->source->data[i];

} else {

bracket = 0;

name.data = &sc->source->data[i];

}

for ( /* void */ ; i < sc->source->len; i++, name.len++) {

ch = sc->source->data[i];

if (ch == '}' && bracket) {

i++;

bracket = 0;

break;

}

if (num_var) {

if (ch >= '0' && ch <= '9') {

n = n * 10 + (ch - '0');

continue;

}

break;

}

/* not a number variable like $1, $2, etc */

if ((ch >= 'A' && ch <= 'Z')

|| (ch >= 'a' && ch <= 'z')

|| (ch >= '0' && ch <= '9')

|| ch == '_')

{

continue;

}

break;

}

if (bracket) {

ngx_log_error(NGX_LOG_ERR, sc->log, 0,

"the closing bracket in \"%V\" "

"variable is missing", &name);

return NGX_ERROR;

}

if (name.len == 0) {

goto invalid_variable;

}

if (!num_var) {

ngx_log_error(NGX_LOG_ERR, sc->log, 0,

"attempt to use named capturing variable "

"\"%V\" (named captures not supported yet)",

&name);

return NGX_ERROR;

}

sc->variables++;

if (ngx_http_lua_script_add_capture_code(sc, n) != NGX_OK) {

return NGX_ERROR;

}

continue;

}

name.data = &sc->source->data[i];

while (i < sc->source->len) {

if (sc->source->data[i] == '$') {

break;

}

i++;

name.len++;

}

if (ngx_http_lua_script_add_copy_code(sc, &name, (i == sc->source->len))

!= NGX_OK)

{

return NGX_ERROR;

}

return ngx_http_lua_script_done(sc);

invalid_variable:

ngx_log_error(NGX_LOG_ERR, sc->log, 0,

"lua script: invalid capturing variable name found in \"%V\"",

sc->source);

return NGX_ERROR;

}

static ngx_int_t

ngx_http_lua_script_add_copy_code(ngx_http_lua_script_compile_t *sc,

ngx_str_t *value, ngx_uint_t last)

{

size_t size, len;

ngx_http_lua_script_copy_code_t *code;

len = value->len;

code = ngx_http_lua_script_add_code(*sc->lengths,

sizeof(ngx_http_lua_script_copy_code_t));

if (code == NULL) {

return NGX_ERROR;

}

code->code = (ngx_http_lua_script_code_pt) (void *)

ngx_http_lua_script_copy_len_code;

code->len = len;

size = (sizeof(ngx_http_lua_script_copy_code_t) + len +

sizeof(uintptr_t) - 1) & ~(sizeof(uintptr_t) - 1);

code = ngx_http_lua_script_add_code(*sc->values, size);

if (code == NULL) {

return NGX_ERROR;

}

code->code = ngx_http_lua_script_copy_code;

code->len = len;

ngx_memcpy((u_char *) code + sizeof(ngx_http_lua_script_copy_code_t),

value->data, value->len);

return NGX_OK;

}

static size_t

ngx_http_lua_script_copy_len_code(ngx_http_lua_script_engine_t *e)

{

ngx_http_lua_script_copy_code_t *code;

code = (ngx_http_lua_script_copy_code_t *) e->ip;

e->ip += sizeof(ngx_http_lua_script_copy_code_t);

return code->len;

}

static void

ngx_http_lua_script_copy_code(ngx_http_lua_script_engine_t *e)

{

u_char *p;

ngx_http_lua_script_copy_code_t *code;

code = (ngx_http_lua_script_copy_code_t *) e->ip;

p = e->pos;

if (!e->skip) {

e->pos = ngx_copy(p, e->ip + sizeof(ngx_http_lua_script_copy_code_t),

code->len);

}

e->ip += sizeof(ngx_http_lua_script_copy_code_t)

+ ((code->len + sizeof(uintptr_t) - 1) & ~(sizeof(uintptr_t) - 1));

ngx_log_debug2(NGX_LOG_DEBUG_HTTP, e->log, 0,

"lua script copy: \"%*s\"", e->pos - p, p);

}

static ngx_int_t

ngx_http_lua_script_add_capture_code(ngx_http_lua_script_compile_t *sc,

ngx_uint_t n)

{

ngx_http_lua_script_capture_code_t *code;

code = ngx_http_lua_script_add_code(*sc->lengths,

sizeof(ngx_http_lua_script_capture_code_t));

if (code == NULL) {

return NGX_ERROR;

}

code->code = (ngx_http_lua_script_code_pt) (void *)

ngx_http_lua_script_copy_capture_len_code;

code->n = 2 * n;

code = ngx_http_lua_script_add_code(*sc->values,

sizeof(ngx_http_lua_script_capture_code_t));

if (code == NULL) {

return NGX_ERROR;

}

code->code = ngx_http_lua_script_copy_capture_code;

code->n = 2 * n;

return NGX_OK;

}

static size_t

ngx_http_lua_script_copy_capture_len_code(ngx_http_lua_script_engine_t *e)

{

int *cap;

ngx_uint_t n;

ngx_http_lua_script_capture_code_t *code;

code = (ngx_http_lua_script_capture_code_t *) e->ip;

e->ip += sizeof(ngx_http_lua_script_capture_code_t);

n = code->n;

if (n < e->ncaptures) {

cap = e->captures;

return cap[n + 1] - cap[n];

}

return 0;

}

static void

ngx_http_lua_script_copy_capture_code(ngx_http_lua_script_engine_t *e)

{

int *cap;

u_char *p, *pos;

ngx_uint_t n;

ngx_http_lua_script_capture_code_t *code;

code = (ngx_http_lua_script_capture_code_t *) e->ip;

e->ip += sizeof(ngx_http_lua_script_capture_code_t);

n = code->n;

pos = e->pos;

if (n < e->ncaptures) {

cap = e->captures;

p = e->captures_data;

e->pos = ngx_copy(pos, &p[cap[n]], cap[n + 1] - cap[n]);

}

ngx_log_debug2(NGX_LOG_DEBUG_HTTP, e->log, 0,

"lua script capture: \"%*s\"", e->pos - pos, pos);

}

static ngx_int_t

ngx_http_lua_script_init_arrays(ngx_http_lua_script_compile_t *sc)

{

ngx_uint_t n;

if (*sc->lengths == NULL) {

n = sc->variables * (2 * sizeof(ngx_http_lua_script_copy_code_t)

+ sizeof(ngx_http_lua_script_capture_code_t))

+ sizeof(uintptr_t);

*sc->lengths = ngx_array_create(sc->pool, n, 1);

if (*sc->lengths == NULL) {

return NGX_ERROR;

}

if (*sc->values == NULL) {

n = (sc->variables * (2 * sizeof(ngx_http_lua_script_copy_code_t)

+ sizeof(ngx_http_lua_script_capture_code_t))

+ sizeof(uintptr_t)

+ sizeof(uintptr_t) - 1)

& ~(sizeof(uintptr_t) - 1);

*sc->values = ngx_array_create(sc->pool, n, 1);

if (*sc->values == NULL) {

return NGX_ERROR;

}

sc->variables = 0;

return NGX_OK;

}

static ngx_int_t

ngx_http_lua_script_done(ngx_http_lua_script_compile_t *sc)

{

uintptr_t *code;

if (sc->complete_lengths) {

code = ngx_http_lua_script_add_code(*sc->lengths, sizeof(uintptr_t));

if (code == NULL) {

return NGX_ERROR;

}

*code = (uintptr_t) NULL;

}

if (sc->complete_values) {

code = ngx_http_lua_script_add_code(*sc->values, sizeof(uintptr_t));

if (code == NULL) {

return NGX_ERROR;

}

*code = (uintptr_t) NULL;

}

return NGX_OK;

}

static void *

ngx_http_lua_script_add_code(ngx_array_t *codes, size_t size)

{

return ngx_array_push_n(codes, size);

}

/* vi:set ft=c ts=4 sw=4 et fdm=marker: */

lua-nginx-module/src/ngx_http_lua_script.c at master · openresty/lua-nginx-module · GitHub

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