feat: allow skip pass trailers in nginx grpc upstream

.github/workflows/ci.yml

@@ -12,6 +12,7 @@ jobs:
       matrix:
         op_version:
           - "1.25.3.1"
+          - "1.27.1.1"
 
     runs-on: "ubuntu-20.04"
 
@@ -31,6 +32,7 @@ jobs:
           sudo apt install -y cpanminus build-essential libncurses5-dev libreadline-dev libssl-dev perl luarocks libpcre3 libpcre3-dev zlib1g-dev
           sudo luarocks install lua-resty-http > build.log 2>&1 || (cat build.log && exit 1)
           sudo luarocks install lua-resty-openssl > build.log 2>&1 || (cat build.log && exit 1)
+          cd t/assets/grpc && ./setup.sh > build.log 2>&1 || (cat build.log && exit 1) && cd ../../..
 
       - name: Before install
         run: |

lib/resty/apisix/upstream.lua

@@ -5,6 +5,7 @@ local get_phase = ngx.get_phase
 local C = ffi.C
 local NGX_ERROR = ngx.ERROR
 local NGX_OK = ngx.OK
+local type = type
 
 
 base.allows_subsystem("http")
@@ -15,6 +16,8 @@ typedef intptr_t        ngx_int_t;
 ngx_int_t ngx_http_apisix_upstream_set_cert_and_key(ngx_http_request_t *r, void *cert, void *key);
 ngx_int_t ngx_http_apisix_upstream_set_ssl_trusted_store(ngx_http_request_t *r, void *store);
 int ngx_http_apisix_upstream_set_ssl_verify(ngx_http_request_t *r, int verify);
+
+ngx_int_t ngx_http_apisix_set_upstream_pass_trailers(ngx_http_request_t *r, int on);
 ]])
 local _M = {}
 
@@ -106,4 +109,19 @@ end
 _M.set_ssl_verify = set_ssl_verify
 
 
+function _M.set_pass_trailers(on)
+    if type(on) ~= 'boolean' then
+        return nil, "on expects a boolean but found " .. type(on)
+    end
+
+    local r = get_request()
+    local ret = C.ngx_http_apisix_set_upstream_pass_trailers(r, on and 1 or 0)
+    if ret == NGX_ERROR then
+        return nil, "error while setting upstream pass_trailers"
+    end
+
+    return true
+end
+
+
 return _M

patch/1.25.3.1/nginx-upstream_pass_trailers.patch

@@ -0,0 +1,17 @@
+diff --git src/http/ngx_http_upstream.c src/http/ngx_http_upstream.c
+index d04d91e..2dd1102 100644
+--- src/http/ngx_http_upstream.c
++++ src/http/ngx_http_upstream.c
+@@ -2989,6 +2989,12 @@ ngx_http_upstream_process_trailers(ngx_http_request_t *r,
+         return NGX_OK;
+     }
+
++#if (NGX_HTTP_APISIX)
++    if (!ngx_http_apisix_is_upstream_pass_trailers(r)) {
++        return NGX_OK;
++    }
++#endif
++
+     part = &u->headers_in.trailers.part;
+     h = part->elts;
+

patch/1.27.1.1/nginx-upstream_pass_trailers.patch

@@ -0,0 +1,17 @@
+diff --git src/http/ngx_http_upstream.c src/http/ngx_http_upstream.c
+index d04d91e..2dd1102 100644
+--- src/http/ngx_http_upstream.c
++++ src/http/ngx_http_upstream.c
+@@ -2989,6 +2989,12 @@ ngx_http_upstream_process_trailers(ngx_http_request_t *r,
+         return NGX_OK;
+     }
+
++#if (NGX_HTTP_APISIX)
++    if (!ngx_http_apisix_is_upstream_pass_trailers(r)) {
++        return NGX_OK;
++    }
++#endif
++
+     part = &u->headers_in.trailers.part;
+     h = part->elts;
+

src/ngx_http_apisix_module.c

@@ -1048,3 +1048,35 @@ ngx_http_apisix_error_log_request_id(ngx_conf_t *cf, ngx_command_t *cmd, void *c
     return NGX_CONF_OK;
 }
 
+
+ngx_int_t
+ngx_http_apisix_set_upstream_pass_trailers(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->upstream_pass_trailers = on;
+    ctx->upstream_pass_trailers_set = 1;
+    return NGX_OK;
+}
+
+
+ngx_int_t
+ngx_http_apisix_is_upstream_pass_trailers(ngx_http_request_t *r)
+{
+    ngx_http_apisix_ctx_t          *ctx;
+
+    ctx = ngx_http_apisix_get_module_ctx(r);
+
+    if (ctx != NULL && ctx->upstream_pass_trailers_set) {
+        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "apisix upstream pass trailers set: %d", ctx->upstream_pass_trailers);
+        return ctx->upstream_pass_trailers;
+    }
+
+    return 1;
+}

src/ngx_http_apisix_module.h

@@ -37,6 +37,8 @@ typedef struct {
     unsigned             body_filter_by_lua_skipped:1;
     unsigned             upstream_ssl_verify:1;
     unsigned             upstream_ssl_verify_set:1;
+    unsigned             upstream_pass_trailers:1;
+    unsigned             upstream_pass_trailers_set:1;
 } ngx_http_apisix_ctx_t;
 
 
@@ -66,4 +68,7 @@ ngx_flag_t ngx_http_apisix_is_ntls_enabled(ngx_http_conf_ctx_t *conf_ctx);
 char * ngx_http_apisix_error_log_request_id(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
 char * ngx_http_apisix_error_log_init(ngx_conf_t *cf);
 char * ngx_http_apisix_error_log_request_id(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
+
+ngx_int_t ngx_http_apisix_set_upstream_pass_trailers(ngx_http_request_t *r, int on);
+ngx_int_t ngx_http_apisix_is_upstream_pass_trailers(ngx_http_request_t *r);
 #endif /* _NGX_HTTP_APISIX_H_INCLUDED_ */