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[njs] HTTP: added js body filter.

Dmitry Volyntsev
February 19, 2021 08:00AM
details: https://hg.nginx.org/njs/rev/8770e0292110
branches:
changeset: 1607:8770e0292110
user: Dmitry Volyntsev <xeioex@nginx.com>
date: Thu Feb 18 19:51:10 2021 +0000
description:
HTTP: added js body filter.

diffstat:

nginx/ngx_http_js_module.c | 340 ++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 339 insertions(+), 1 deletions(-)

diffs (448 lines):

diff -r 047339264048 -r 8770e0292110 nginx/ngx_http_js_module.c
--- a/nginx/ngx_http_js_module.c Tue Feb 16 13:32:22 2021 +0000
+++ b/nginx/ngx_http_js_module.c Thu Feb 18 19:51:10 2021 +0000
@@ -25,6 +25,8 @@ typedef struct {
typedef struct {
ngx_str_t content;
ngx_str_t header_filter;
+ ngx_str_t body_filter;
+ ngx_uint_t buffer_type;
} ngx_http_js_loc_conf_t;


@@ -46,6 +48,12 @@ typedef struct {
njs_opaque_value_t response_body;
ngx_str_t redirect_uri;
ngx_array_t promise_callbacks;
+
+ ngx_int_t filter;
+ ngx_buf_t *buf;
+ ngx_chain_t **last_out;
+ ngx_chain_t *free;
+ ngx_chain_t *busy;
} ngx_http_js_ctx_t;


@@ -123,6 +131,10 @@ static njs_int_t ngx_http_js_ext_send_he
njs_uint_t nargs, njs_index_t unused);
static njs_int_t ngx_http_js_ext_send(njs_vm_t *vm, njs_value_t *args,
njs_uint_t nargs, njs_index_t unused);
+static njs_int_t ngx_http_js_ext_send_buffer(njs_vm_t *vm, njs_value_t *args,
+ njs_uint_t nargs, njs_index_t unused);
+static njs_int_t ngx_http_js_ext_done(njs_vm_t *vm, njs_value_t *args,
+ njs_uint_t nargs, njs_index_t unused);
static njs_int_t ngx_http_js_ext_finish(njs_vm_t *vm, njs_value_t *args,
njs_uint_t nargs, njs_index_t unused);
static njs_int_t ngx_http_js_ext_return(njs_vm_t *vm, njs_value_t *args,
@@ -199,6 +211,8 @@ static char *ngx_http_js_import(ngx_conf
static char *ngx_http_js_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char *ngx_http_js_content(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
+static char *ngx_http_js_body_filter_set(ngx_conf_t *cf, ngx_command_t *cmd,
+ void *conf);
static void *ngx_http_js_create_main_conf(ngx_conf_t *cf);
static char *ngx_http_js_init_main_conf(ngx_conf_t *cf, void *conf);
static void *ngx_http_js_create_loc_conf(ngx_conf_t *cf);
@@ -250,6 +264,13 @@ static ngx_command_t ngx_http_js_comman
offsetof(ngx_http_js_loc_conf_t, header_filter),
NULL },

+ { ngx_string("js_body_filter"),
+ NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF|NGX_CONF_TAKE12,
+ ngx_http_js_body_filter_set,
+ NGX_HTTP_LOC_CONF_OFFSET,
+ 0,
+ NULL },
+
ngx_null_command
};

@@ -286,6 +307,7 @@ ngx_module_t ngx_http_js_module = {


static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
+static ngx_http_output_body_filter_pt ngx_http_next_body_filter;


static njs_external_t ngx_http_js_ext_request[] = {
@@ -554,6 +576,28 @@ static njs_external_t ngx_http_js_ext_r

{
.flags = NJS_EXTERN_METHOD,
+ .name.string = njs_str("sendBuffer"),
+ .writable = 1,
+ .configurable = 1,
+ .enumerable = 1,
+ .u.method = {
+ .native = ngx_http_js_ext_send_buffer,
+ }
+ },
+
+ {
+ .flags = NJS_EXTERN_METHOD,
+ .name.string = njs_str("done"),
+ .writable = 1,
+ .configurable = 1,
+ .enumerable = 1,
+ .u.method = {
+ .native = ngx_http_js_ext_done,
+ }
+ },
+
+ {
+ .flags = NJS_EXTERN_METHOD,
.name.string = njs_str("finish"),
.writable = 1,
.configurable = 1,
@@ -792,6 +836,138 @@ ngx_http_js_header_filter(ngx_http_reque


static ngx_int_t
+ngx_http_js_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
+{
+ size_t len;
+ u_char *p;
+ ngx_int_t rc;
+ njs_str_t exception;
+ njs_int_t ret, pending;
+ ngx_buf_t *b;
+ ngx_chain_t *out, *cl;
+ ngx_connection_t *c;
+ ngx_http_js_ctx_t *ctx;
+ njs_opaque_value_t last_key, last;
+ ngx_http_js_loc_conf_t *jlcf;
+ njs_opaque_value_t arguments[3];
+
+ static const njs_str_t last_str = njs_str("last");
+
+ jlcf = ngx_http_get_module_loc_conf(r, ngx_http_js_module);
+
+ if (jlcf->body_filter.len == 0) {
+ return ngx_http_next_body_filter(r, in);
+ }
+
+ rc = ngx_http_js_init_vm(r);
+
+ if (rc == NGX_ERROR || rc == NGX_DECLINED) {
+ return NGX_ERROR;
+ }
+
+ ctx = ngx_http_get_module_ctx(r, ngx_http_js_module);
+
+ if (ctx->done) {
+ return ngx_http_next_body_filter(r, in);
+ }
+
+ c = r->connection;
+
+ ctx->filter = 1;
+ ctx->last_out = &out;
+
+ njs_value_assign(&arguments[0], &ctx->request);
+
+ njs_vm_value_string_set(ctx->vm, njs_value_arg(&last_key),
+ last_str.start, last_str.length);
+
+ while (in != NULL) {
+ ctx->buf = in->buf;
+ b = ctx->buf;
+
+ if (!ctx->done) {
+ len = b->last - b->pos;
+
+ p = ngx_pnalloc(r->pool, len);
+ if (p == NULL) {
+ njs_vm_memory_error(ctx->vm);
+ return NJS_ERROR;
+ }
+
+ if (len) {
+ ngx_memcpy(p, b->pos, len);
+ }
+
+ ret = ngx_js_prop(ctx->vm, jlcf->buffer_type,
+ njs_value_arg(&arguments[1]), p, len);
+ if (ret != NJS_OK) {
+ return ret;
+ }
+
+ njs_value_boolean_set(njs_value_arg(&last), b->last_buf);
+
+ ret = njs_vm_object_alloc(ctx->vm, njs_value_arg(&arguments[2]),
+ njs_value_arg(&last_key),
+ njs_value_arg(&last), NULL);
+ if (ret != NJS_OK) {
+ return ret;
+ }
+
+ pending = njs_vm_pending(ctx->vm);
+
+ rc = ngx_js_call(ctx->vm, &jlcf->body_filter, c->log, &arguments[0],
+ 3);
+
+ if (rc == NGX_ERROR) {
+ njs_vm_retval_string(ctx->vm, &exception);
+
+ ngx_log_error(NGX_LOG_ERR, c->log, 0, "js exception: %*s",
+ exception.length, exception.start);
+
+ return NGX_ERROR;
+ }
+
+ if (!pending && rc == NGX_AGAIN) {
+ ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+ "async operation inside \"%V\" body filter",
+ &jlcf->body_filter);
+ return NGX_ERROR;
+ }
+
+ ctx->buf->pos = ctx->buf->last;
+
+ } else {
+ cl = ngx_alloc_chain_link(c->pool);
+ if (cl == NULL) {
+ return NGX_ERROR;
+ }
+
+ cl->buf = b;
+
+ *ctx->last_out = cl;
+ ctx->last_out = &cl->next;
+ }
+
+ in = in->next;
+ }
+
+ *ctx->last_out = NULL;
+
+ if (out != NULL || c->buffered) {
+ rc = ngx_http_next_body_filter(r, out);
+
+ ngx_chain_update_chains(c->pool, &ctx->free, &ctx->busy, &out,
+ (ngx_buf_tag_t) &ngx_http_js_module);
+
+ } else {
+ rc = NGX_OK;
+ }
+
+ return rc;
+}
+
+
+static ngx_int_t
ngx_http_js_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
uintptr_t data)
{
@@ -1726,14 +1902,22 @@ ngx_http_js_ext_send(njs_vm_t *vm, njs_v
uintptr_t next;
ngx_uint_t n;
ngx_chain_t *out, *cl, **ll;
+ ngx_http_js_ctx_t *ctx;
ngx_http_request_t *r;

- r = njs_vm_external(vm, njs_arg(args, nargs, 0));
+ r = njs_vm_external(vm, njs_argument(args, 0));
if (r == NULL) {
njs_vm_error(vm, "\"this\" is not an external");
return NJS_ERROR;
}

+ ctx = ngx_http_get_module_ctx(r, ngx_http_js_module);
+
+ if (ctx->filter) {
+ njs_vm_error(vm, "cannot send while in body filter");
+ return NJS_ERROR;
+ }
+
out = NULL;
ll = &out;

@@ -1794,6 +1978,114 @@ ngx_http_js_ext_send(njs_vm_t *vm, njs_v


static njs_int_t
+ngx_http_js_ext_send_buffer(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
+ njs_index_t unused)
+{
+ unsigned last_buf, flush;
+ njs_str_t buffer;
+ ngx_buf_t *b;
+ ngx_chain_t *cl;
+ njs_value_t *flags, *value;
+ ngx_http_js_ctx_t *ctx;
+ ngx_http_request_t *r;
+ njs_opaque_value_t lvalue;
+
+ static const njs_str_t last_key = njs_str("last");
+ static const njs_str_t flush_key = njs_str("flush");
+
+ r = njs_vm_external(vm, njs_argument(args, 0));
+ if (r == NULL) {
+ njs_vm_error(vm, "\"this\" is not an external");
+ return NJS_ERROR;
+ }
+
+ ctx = ngx_http_get_module_ctx(r, ngx_http_js_module);
+
+ if (!ctx->filter) {
+ njs_vm_error(vm, "cannot send buffer while not filtering");
+ return NJS_ERROR;
+ }
+
+ if (ngx_js_string(vm, njs_arg(args, nargs, 1), &buffer) != NGX_OK) {
+ njs_vm_error(vm, "failed to get buffer arg");
+ return NJS_ERROR;
+ }
+
+ flush = ctx->buf->flush;
+ last_buf = ctx->buf->last_buf;
+
+ flags = njs_arg(args, nargs, 2);
+
+ if (njs_value_is_object(flags)) {
+ value = njs_vm_object_prop(vm, flags, &flush_key, &lvalue);
+ if (value != NULL) {
+ flush = njs_value_bool(value);
+ }
+
+ value = njs_vm_object_prop(vm, flags, &last_key, &lvalue);
+ if (value != NULL) {
+ last_buf = njs_value_bool(value);
+ }
+ }
+
+ cl = ngx_chain_get_free_buf(r->pool, &ctx->free);
+ if (cl == NULL) {
+ njs_vm_error(vm, "memory error");
+ return NJS_ERROR;
+ }
+
+ b = cl->buf;
+
+ b->flush = flush;
+ b->last_buf = last_buf;
+
+ b->memory = (buffer.length ? 1 : 0);
+ b->sync = (buffer.length ? 0 : 1);
+ b->tag = (ngx_buf_tag_t) &ngx_http_js_module;
+
+ b->start = buffer.start;
+ b->end = buffer.start + buffer.length;
+ b->pos = b->start;
+ b->last = b->end;
+
+ *ctx->last_out = cl;
+ ctx->last_out = &cl->next;
+
+ njs_value_undefined_set(njs_vm_retval(vm));
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
+ngx_http_js_ext_done(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
+ njs_index_t unused)
+{
+ ngx_http_js_ctx_t *ctx;
+ ngx_http_request_t *r;
+
+ r = njs_vm_external(vm, njs_argument(args, 0));
+ if (r == NULL) {
+ njs_vm_error(vm, "\"this\" is not an external");
+ return NJS_ERROR;
+ }
+
+ ctx = ngx_http_get_module_ctx(r, ngx_http_js_module);
+
+ if (!ctx->filter) {
+ njs_vm_error(vm, "cannot set done while not filtering");
+ return NJS_ERROR;
+ }
+
+ ctx->done = 1;
+
+ njs_value_undefined_set(njs_vm_retval(vm));
+
+ return NJS_OK;
+}
+
+
+static njs_int_t
ngx_http_js_ext_finish(njs_vm_t *vm, njs_value_t *args, njs_uint_t nargs,
njs_index_t unused)
{
@@ -3281,6 +3573,9 @@ ngx_http_js_init(ngx_conf_t *cf)
ngx_http_next_header_filter = ngx_http_top_header_filter;
ngx_http_top_header_filter = ngx_http_js_header_filter;

+ ngx_http_next_body_filter = ngx_http_top_body_filter;
+ ngx_http_top_body_filter = ngx_http_js_body_filter;
+
return NGX_OK;
}

@@ -3469,6 +3764,44 @@ ngx_http_js_content(ngx_conf_t *cf, ngx_
}


+static char *
+ngx_http_js_body_filter_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+ ngx_http_js_loc_conf_t *jlcf = conf;
+
+ ngx_str_t *value;
+
+ if (jlcf->body_filter.data) {
+ return "is duplicate";
+ }
+
+ value = cf->args->elts;
+ jlcf->body_filter = value[1];
+
+ jlcf->buffer_type = NGX_JS_STRING;
+
+ if (cf->args->nelts == 3
+ && ngx_strncmp(value[2].data, "buffer_type=", 12) == 0)
+ {
+ if (ngx_strcmp(&value[2].data[12], "string") == 0) {
+ jlcf->buffer_type = NGX_JS_STRING;
+
+ } else if (ngx_strcmp(&value[2].data[12], "buffer") == 0) {
+ jlcf->buffer_type = NGX_JS_BUFFER;
+
+ } else {
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "invalid buffer_type value \"%V\", "
+ "it must be \"string\" or \"buffer\"",
+ &value[2]);
+ return NGX_CONF_ERROR;
+ }
+ }
+
+ return NGX_CONF_OK;
+}
+
+
static void *
ngx_http_js_create_main_conf(ngx_conf_t *cf)
{
@@ -3510,6 +3843,8 @@ ngx_http_js_create_loc_conf(ngx_conf_t *
*
* conf->content = { 0, NULL };
* conf->header_filter = { 0, NULL };
+ * conf->body_filter = { 0, NULL };
+ * conf->buffer_type = NGX_JS_UNSET;
*/

return conf;
@@ -3524,6 +3859,9 @@ ngx_http_js_merge_loc_conf(ngx_conf_t *c

ngx_conf_merge_str_value(conf->content, prev->content, "");
ngx_conf_merge_str_value(conf->header_filter, prev->header_filter, "");
+ ngx_conf_merge_str_value(conf->body_filter, prev->body_filter, "");
+ ngx_conf_merge_uint_value(conf->buffer_type, prev->buffer_type,
+ NGX_JS_STRING);

return NGX_CONF_OK;
}
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Subject Author Views Posted

[njs] HTTP: added js body filter.

Dmitry Volyntsev 38 February 19, 2021 08:00AM



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