HTTP: compress: added "compress" action.

There are still no supported encodings.  This is just infrastructure for
the next commits, which will add gzip compression.

Signed-off-by: Alejandro Colomar <alx@nginx.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

7 files changed, 172 insertions, 4 deletions

diff --git a/auto/sources b/auto/sources
index 6ee4d87b..d8884b91 100644
--- a/auto/sources
+++ b/auto/sources
@@ -87,6 +87,7 @@ NXT_LIB_SRCS=" \
     src/nxt_router_access_log.c \
     src/nxt_h1proto.c \
     src/nxt_status.c \
+    src/nxt_http_compress.c \
     src/nxt_http_request.c \
     src/nxt_http_response.c \
     src/nxt_http_error.c \
diff --git a/src/nxt_conf_validation.c b/src/nxt_conf_validation.c
index f00b28b8..0e1f7340 100644
--- a/src/nxt_conf_validation.c
+++ b/src/nxt_conf_validation.c
@@ -254,6 +254,7 @@ static nxt_conf_vldt_object_t  nxt_conf_vldt_php_options_members[];
 static nxt_conf_vldt_object_t  nxt_conf_vldt_php_target_members[];
 static nxt_conf_vldt_object_t  nxt_conf_vldt_wasm_access_members[];
 static nxt_conf_vldt_object_t  nxt_conf_vldt_common_members[];
+static nxt_conf_vldt_object_t  nxt_conf_vldt_compress_members[];
 static nxt_conf_vldt_object_t  nxt_conf_vldt_app_limits_members[];
 static nxt_conf_vldt_object_t  nxt_conf_vldt_app_processes_members[];
 static nxt_conf_vldt_object_t  nxt_conf_vldt_app_isolation_members[];
@@ -697,6 +698,11 @@ static nxt_conf_vldt_object_t  nxt_conf_vldt_action_common_members[] = {
         .validator  = nxt_conf_vldt_object_iterator,
         .u.object   = nxt_conf_vldt_response_header,
     },
+    {
+        .name       = nxt_string("compress"),
+        .type       = NXT_CONF_VLDT_OBJECT,
+        .u.members  = nxt_conf_vldt_compress_members,
+    },
 
     NXT_CONF_VLDT_END
 };
@@ -1148,6 +1154,16 @@ static nxt_conf_vldt_object_t  nxt_conf_vldt_common_members[] = {
 };
 
 
+static nxt_conf_vldt_object_t  nxt_conf_vldt_compress_members[] = {
+    {
+        .name       = nxt_string("encoding"),
+        .type       = NXT_CONF_VLDT_STRING,
+    },
+
+    NXT_CONF_VLDT_END
+};
+
+
 static nxt_conf_vldt_object_t  nxt_conf_vldt_app_limits_members[] = {
     {
         .name       = nxt_string("timeout"),
diff --git a/src/nxt_http.h b/src/nxt_http.h
index 300c197d..94df6f2e 100644
--- a/src/nxt_http.h
+++ b/src/nxt_http.h
@@ -10,6 +10,9 @@
 #include <nxt_regex.h>
 
 
+typedef struct nxt_http_compress_conf_s   nxt_http_compress_conf_t;
+
+
 typedef enum {
     NXT_HTTP_UNSET = -1,
     NXT_HTTP_INVALID = 0,
@@ -233,6 +236,7 @@ typedef struct nxt_http_route_addr_rule_s  nxt_http_route_addr_rule_t;
 typedef struct {
     nxt_conf_value_t                *rewrite;
     nxt_conf_value_t                *set_headers;
+    nxt_conf_value_t                *compress;
     nxt_conf_value_t                *pass;
     nxt_conf_value_t                *ret;
     nxt_conf_value_t                *location;
@@ -262,6 +266,7 @@ struct nxt_http_action_s {
 
     nxt_tstr_t                      *rewrite;
     nxt_array_t                     *set_headers;  /* of nxt_http_field_t */
+    nxt_http_compress_conf_t        *compress;
     nxt_http_action_t               *fallback;
 };
 
diff --git a/src/nxt_http_compress.c b/src/nxt_http_compress.c
new file mode 100644
index 00000000..0f3d8a89
--- /dev/null
+++ b/src/nxt_http_compress.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) Alejandro Colomar
+ * Copyright (C) NGINX, Inc.
+ */
+
+
+#include "nxt_http_compress.h"
+
+#include <stddef.h>
+
+#include <nxt_unit_cdefs.h>
+
+#include "nxt_clang.h"
+#include "nxt_conf.h"
+#include "nxt_errno.h"
+#include "nxt_http.h"
+#include "nxt_list.h"
+#include "nxt_main.h"
+#include "nxt_mp.h"
+#include "nxt_router.h"
+#include "nxt_string.h"
+#include "nxt_types.h"
+
+
+static nxt_conf_map_t  nxt_http_compress_conf[] = {
+    {
+        nxt_string("encoding"),
+        NXT_CONF_MAP_STR,
+        offsetof(nxt_http_compress_conf_t, encoding),
+    },
+};
+
+
+nxt_int_t
+nxt_http_compress_init(nxt_router_conf_t *rtcf, nxt_http_action_t *action,
+    nxt_http_action_conf_t *acf)
+{
+    nxt_mp_t                  *mp;
+    nxt_int_t                 ret;
+    nxt_http_compress_conf_t  *conf;
+
+    mp = rtcf->mem_pool;
+
+    conf = nxt_mp_zget(mp, sizeof(nxt_http_compress_conf_t));
+    if (nxt_slow_path(conf == NULL)) {
+        return NXT_ERROR;
+    }
+
+    ret = nxt_conf_map_object(mp, acf->compress, nxt_http_compress_conf,
+                              nxt_nitems(nxt_http_compress_conf), conf);
+    if (nxt_slow_path(ret == NXT_ERROR)) {
+        return NXT_ERROR;
+    }
+
+    if (0) {
+
+    } else {
+        return NXT_ERROR;
+    }
+
+    action->compress = conf;
+
+    return NXT_OK;
+}
+
+
+nxt_int_t
+nxt_http_compress_append_field(nxt_task_t *task, nxt_http_request_t *r,
+    nxt_str_t *field, nxt_str_t *value)
+{
+    nxt_http_field_t  *f;
+
+    f = nxt_list_add(r->resp.fields);
+    if (nxt_slow_path(f == NULL)) {
+        return NXT_ERROR;
+    }
+
+    f->hash = 0;
+    f->skip = 0;
+    f->hopbyhop = 0;
+
+    f->name_length = field->length;
+    f->value_length = value->length;
+    f->name = field->start;
+    f->value = value->start;
+
+    return NXT_OK;
+}
diff --git a/src/nxt_http_compress.h b/src/nxt_http_compress.h
new file mode 100644
index 00000000..57bebd1c
--- /dev/null
+++ b/src/nxt_http_compress.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) Alejandro Colomar
+ * Copyright (C) NGINX, Inc.
+ */
+
+#ifndef NXT_HTTP_COMPRESS_H_INCLUDED_
+#define NXT_HTTP_COMPRESS_H_INCLUDED_
+
+
+#include "nxt_router.h"
+
+#include "nxt_http.h"
+#include "nxt_main.h"
+#include "nxt_router.h"
+#include "nxt_string.h"
+#include "nxt_types.h"
+
+
+struct nxt_http_compress_conf_s {
+    nxt_str_t  encoding;
+
+    nxt_int_t  (*handler)(nxt_task_t *task,
+                          nxt_http_request_t *r,
+                          nxt_http_compress_conf_t *conf);
+};
+
+
+nxt_int_t nxt_http_compress_init(nxt_router_conf_t *rtcf,
+    nxt_http_action_t *action, nxt_http_action_conf_t *acf);
+
+nxt_int_t nxt_http_compress_append_field(nxt_task_t *task,
+    nxt_http_request_t *r, nxt_str_t *field, nxt_str_t *value);
+
+
+#endif  /* NXT_HTTP_COMPRESS_H_INCLUDED_ */
diff --git a/src/nxt_http_request.c b/src/nxt_http_request.c
index e72a7492..ecbc5a45 100644
--- a/src/nxt_http_request.c
+++ b/src/nxt_http_request.c
@@ -7,6 +7,7 @@
 #include <nxt_router.h>
 #include <nxt_http.h>
 
+#include "nxt_http_compress.h"
 #include "nxt_http_filter.h"
 
 
@@ -635,10 +636,19 @@ nxt_http_request_read_body(nxt_task_t *task, nxt_http_request_t *r)
 void
 nxt_http_request_header_send(nxt_task_t *task, nxt_http_request_t *r)
 {
-    u_char             *p, *end, *server_string;
-    nxt_int_t          ret;
-    nxt_http_field_t   *server, *date, *content_length;
-    nxt_socket_conf_t  *skcf;
+    u_char                    *p, *end, *server_string;
+    nxt_int_t                 ret;
+    nxt_http_field_t          *server, *date, *content_length;
+    nxt_socket_conf_t         *skcf;
+    nxt_http_compress_conf_t  *compress;
+
+    compress = r->action->compress;
+    if (compress != NULL) {
+        ret = compress->handler(task, r, compress);
+        if (nxt_slow_path(ret == NXT_ERROR)) {
+            goto fail;
+        }
+    }
 
     ret = nxt_http_set_headers(r);
     if (nxt_slow_path(ret != NXT_OK)) {
diff --git a/src/nxt_http_route.c b/src/nxt_http_route.c
index 4a64d5c1..523dda40 100644
--- a/src/nxt_http_route.c
+++ b/src/nxt_http_route.c
@@ -9,6 +9,7 @@
 #include <nxt_sockaddr.h>
 #include <nxt_http_route_addr.h>
 #include <nxt_regex.h>
+#include "nxt_http_compress.h"
 
 
 typedef enum {
@@ -589,6 +590,11 @@ static nxt_conf_map_t  nxt_http_route_action_conf[] = {
         offsetof(nxt_http_action_conf_t, set_headers)
     },
     {
+        nxt_string("compress"),
+        NXT_CONF_MAP_PTR,
+        offsetof(nxt_http_action_conf_t, compress)
+    },
+    {
         nxt_string("pass"),
         NXT_CONF_MAP_PTR,
         offsetof(nxt_http_action_conf_t, pass)
@@ -683,6 +689,13 @@ nxt_http_action_init(nxt_task_t *task, nxt_router_temp_conf_t *tmcf,
         }
     }
 
+    if (acf.compress != NULL) {
+        ret = nxt_http_compress_init(rtcf, action, &acf);
+        if (nxt_slow_path(ret != NXT_OK)) {
+            return ret;
+        }
+    }
+
     if (acf.ret != NULL) {
         return nxt_http_return_init(rtcf, action, &acf);
     }