feat: set proxy_request_buffering

lib/resty/apisix/client.lua

@@ -23,6 +23,9 @@ ngx_http_apisix_enable_mirror(ngx_http_request_t *r);
 ngx_int_t
 ngx_http_apisix_set_real_ip(ngx_http_request_t *r, const u_char *text, size_t len,
                             unsigned int port);
+
+ngx_int_t
+ngx_http_apisix_set_proxy_request_buffering(ngx_http_request_t *r, int on);
 ]])
 local _M = {}
 
@@ -65,4 +68,15 @@ function _M.set_real_ip(ip, port)
 end
 
 
+function _M.set_proxy_request_buffering(on)
+    local r = get_request()
+    local ret = C.ngx_http_apisix_set_proxy_request_buffering(r, on and 1 or 0)
+    if ret == NGX_ERROR then
+        return nil, "error while setting proxy_request_buffering"
+    end
+
+    return true
+end
+
+
 return _M

patch/1.19.9/nginx-proxy_request_buffering.patch

@@ -0,0 +1,26 @@
+diff --git src/http/modules/ngx_http_proxy_module.c src/http/modules/ngx_http_proxy_module.c
+index 3f05235..41c2313 100644
+--- src/http/modules/ngx_http_proxy_module.c
++++ src/http/modules/ngx_http_proxy_module.c
+@@ -8,6 +8,9 @@
+ #include <ngx_config.h>
+ #include <ngx_core.h>
+ #include <ngx_http.h>
++#if (NGX_HTTP_APISIX)
++#include "ngx_http_apisix_module.h"
++#endif
+
+
+ #define  NGX_HTTP_PROXY_COOKIE_SECURE           0x0001
+@@ -1013,7 +1016,11 @@ ngx_http_proxy_handler(ngx_http_request_t *r)
+
+     u->accel = 1;
+
++#if (NGX_HTTP_APISIX)
++    if (!ngx_http_apisix_is_request_buffering(r, plcf->upstream.request_buffering)
++#else
+     if (!plcf->upstream.request_buffering
++#endif
+         && plcf->body_values == NULL && plcf->upstream.pass_request_body
+         && (!r->headers_in.chunked
+             || plcf->http_version == NGX_HTTP_VERSION_11))

src/ngx_http_apisix_module.c

@@ -498,3 +498,36 @@ ngx_http_apisix_is_mirror_enabled(ngx_http_request_t *r)
     ctx = ngx_http_apisix_get_module_ctx(r);
     return ctx != NULL && ctx->mirror_enabled;
 }
+
+
+ngx_int_t
+ngx_http_apisix_set_proxy_request_buffering(ngx_http_request_t *r, int on)
+{
+    ngx_http_apisix_ctx_t       *ctx;
+
+    ctx = ngx_http_apisix_get_module_ctx(r);
+
+    if (ctx == NULL) {
+        return NGX_ERROR;
+    }
+
+    ctx->request_buffering = on;
+    ctx->request_buffering_set = 1;
+    return NGX_OK;
+}
+
+
+ngx_int_t
+ngx_http_apisix_is_request_buffering(ngx_http_request_t *r, ngx_flag_t static_conf)
+{
+    ngx_http_apisix_ctx_t          *ctx;
+
+    ctx = ngx_http_apisix_get_module_ctx(r);
+
+    if (ctx != NULL && ctx->request_buffering_set) {
+        return ctx->request_buffering;
+    }
+
+    /* use the static conf if we haven't changed it dynamically */
+    return static_conf;
+}

src/ngx_http_apisix_module.h

@@ -27,6 +27,8 @@ typedef struct {
 
     unsigned             client_max_body_size_set:1;
     unsigned             mirror_enabled:1;
+    unsigned             request_buffering:1;
+    unsigned             request_buffering_set:1;
 } ngx_http_apisix_ctx_t;
 
 
@@ -43,4 +45,6 @@ ngx_int_t ngx_http_apisix_get_gzip_compress_level(ngx_http_request_t *r);
 ngx_int_t ngx_http_apisix_is_mirror_enabled(ngx_http_request_t *r);
 
 
+ngx_int_t ngx_http_apisix_is_request_buffering(ngx_http_request_t *r, ngx_flag_t static_conf);
+
 #endif /* _NGX_HTTP_APISIX_H_INCLUDED_ */

t/proxy_request_buffering.t

@@ -0,0 +1,85 @@
+use t::APISIX_NGINX 'no_plan';
+
+run_tests;
+
+__DATA__
+
+=== TEST 1: proxy_request_buffering off
+--- config
+    proxy_request_buffering off;
+    location /t {
+        proxy_pass http://127.0.0.1:1984/up;
+    }
+    location /up {
+        return 200;
+    }
+--- request eval
+"POST /t
+" . "12345" x 10240
+--- grep_error_log eval
+qr/a client request body is buffered to a temporary file/
+--- grep_error_log_out
+
+
+
+=== TEST 2: proxy_request_buffering off by Lua API
+--- config
+    proxy_request_buffering on;
+    location /t {
+        access_by_lua_block {
+            local client = require("resty.apisix.client")
+            assert(client.set_proxy_request_buffering(false))
+        }
+        proxy_pass http://127.0.0.1:1984/up;
+    }
+    location /up {
+        return 200;
+    }
+--- request eval
+"POST /t
+" . "12345" x 10240
+--- grep_error_log eval
+qr/a client request body is buffered to a temporary file/
+--- grep_error_log_out
+
+
+
+=== TEST 3: proxy_request_buffering on
+--- config
+    proxy_request_buffering on;
+    location /t {
+        proxy_pass http://127.0.0.1:1984/up;
+    }
+    location /up {
+        return 200;
+    }
+--- request eval
+"POST /t
+" . "12345" x 10240
+--- grep_error_log eval
+qr/a client request body is buffered to a temporary file/
+--- grep_error_log_out
+a client request body is buffered to a temporary file
+
+
+
+=== TEST 4: proxy_request_buffering on by Lua API
+--- config
+    proxy_request_buffering off;
+    location /t {
+        access_by_lua_block {
+            local client = require("resty.apisix.client")
+            assert(client.set_proxy_request_buffering(true))
+        }
+        proxy_pass http://127.0.0.1:1984/up;
+    }
+    location /up {
+        return 200;
+    }
+--- request eval
+"POST /t
+" . "12345" x 10240
+--- grep_error_log eval
+qr/a client request body is buffered to a temporary file/
+--- grep_error_log_out
+a client request body is buffered to a temporary file