Adding upstream version 2.4.56.upstream/2.4.56upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 198 insertions, 0 deletions

diff --git a/modules/cache/mod_socache_dc.c b/modules/cache/mod_socache_dc.c
new file mode 100644
index 0000000..1fc52a7
--- /dev/null
+++ b/modules/cache/mod_socache_dc.c
@@ -0,0 +1,198 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "httpd.h"
+#include "http_log.h"
+#include "http_request.h"
+#include "http_config.h"
+#include "http_protocol.h"
+#include "mod_status.h"
+
+#include "apr_strings.h"
+#include "apr_time.h"
+
+#include "ap_socache.h"
+
+#include "distcache/dc_client.h"
+
+#if !defined(DISTCACHE_CLIENT_API) || (DISTCACHE_CLIENT_API < 0x0001)
+#error "You must compile with a more recent version of the distcache-base package"
+#endif
+
+struct ap_socache_instance_t {
+    /* Configured target server: */
+    const char *target;
+    /* distcache client context: */
+    DC_CTX *dc;
+};
+
+static const char *socache_dc_create(ap_socache_instance_t **context,
+                                     const char *arg,
+                                     apr_pool_t *tmp, apr_pool_t *p)
+{
+    struct ap_socache_instance_t *ctx;
+
+    ctx = *context = apr_palloc(p, sizeof *ctx);
+
+    ctx->target = apr_pstrdup(p, arg);
+
+    return NULL;
+}
+
+static apr_status_t socache_dc_init(ap_socache_instance_t *ctx,
+                                    const char *namespace,
+                                    const struct ap_socache_hints *hints,
+                                    server_rec *s, apr_pool_t *p)
+{
+#if 0
+    /* If a "persistent connection" mode of operation is preferred, you *must*
+     * also use the PIDCHECK flag to ensure fork()'d processes don't interlace
+     * comms on the same connection as each other. */
+#define SESSION_CTX_FLAGS        SESSION_CTX_FLAG_PERSISTENT | \
+                                 SESSION_CTX_FLAG_PERSISTENT_PIDCHECK | \
+                                 SESSION_CTX_FLAG_PERSISTENT_RETRY | \
+                                 SESSION_CTX_FLAG_PERSISTENT_LATE
+#else
+    /* This mode of operation will open a temporary connection to the 'target'
+     * for each cache operation - this makes it safe against fork()
+     * automatically. This mode is preferred when running a local proxy (over
+     * unix domain sockets) because overhead is negligible and it reduces the
+     * performance/stability danger of file-descriptor bloatage. */
+#define SESSION_CTX_FLAGS        0
+#endif
+    ctx->dc = DC_CTX_new(ctx->target, SESSION_CTX_FLAGS);
+    if (!ctx->dc) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00738) "distributed scache failed to obtain context");
+        return APR_EGENERAL;
+    }
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(00739) "distributed scache context initialised");
+
+    return APR_SUCCESS;
+}
+
+static void socache_dc_destroy(ap_socache_instance_t *ctx, server_rec *s)
+{
+    if (ctx && ctx->dc) {
+        DC_CTX_free(ctx->dc);
+        ctx->dc = NULL;
+    }
+}
+
+static apr_status_t socache_dc_store(ap_socache_instance_t *ctx, server_rec *s,
+                                     const unsigned char *id, unsigned int idlen,
+                                     apr_time_t expiry,
+                                     unsigned char *der, unsigned int der_len,
+                                     apr_pool_t *p)
+{
+    /* !@#$%^ - why do we deal with *absolute* time anyway???
+     * Uhm - because most things expire things at a specific time?
+     * Were the API were thought out expiry - r->request_time is a good approximation
+     */
+    expiry -= apr_time_now();
+    /* Send the serialised session to the distributed cache context */
+    if (!DC_CTX_add_session(ctx->dc, id, idlen, der, der_len,
+                            apr_time_msec(expiry))) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00740) "distributed scache 'store' failed");
+        return APR_EGENERAL;
+    }
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00741) "distributed scache 'store' successful");
+    return APR_SUCCESS;
+}
+
+static apr_status_t socache_dc_retrieve(ap_socache_instance_t *ctx, server_rec *s,
+                                        const unsigned char *id, unsigned int idlen,
+                                        unsigned char *dest, unsigned int *destlen,
+                                        apr_pool_t *p)
+{
+    unsigned int data_len;
+
+    /* Retrieve any corresponding session from the distributed cache context */
+    if (!DC_CTX_get_session(ctx->dc, id, idlen, dest, *destlen, &data_len)) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00742) "distributed scache 'retrieve' MISS");
+        return APR_NOTFOUND;
+    }
+    if (data_len > *destlen) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00743) "distributed scache 'retrieve' OVERFLOW");
+        return APR_ENOSPC;
+    }
+    *destlen = data_len;
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00744) "distributed scache 'retrieve' HIT");
+    return APR_SUCCESS;
+}
+
+static apr_status_t socache_dc_remove(ap_socache_instance_t *ctx,
+                                      server_rec *s, const unsigned char *id,
+                                      unsigned int idlen, apr_pool_t *p)
+{
+    /* Remove any corresponding session from the distributed cache context */
+    if (!DC_CTX_remove_session(ctx->dc, id, idlen)) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00745) "distributed scache 'remove' MISS");
+        return APR_NOTFOUND;
+    }
+    else {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00746) "distributed scache 'remove' HIT");
+        return APR_SUCCESS;
+    }
+}
+
+static void socache_dc_status(ap_socache_instance_t *ctx, request_rec *r, int flags)
+{
+    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00747)
+                  "distributed scache 'socache_dc_status'");
+    if (!(flags & AP_STATUS_SHORT)) {
+        ap_rprintf(r, "cache type: <b>DC (Distributed Cache)</b>, "
+                   " target: <b>%s</b><br>", ctx->target);
+    }
+    else {
+        ap_rputs("CacheType: DC\n", r);
+        ap_rvputs(r, "CacheTarget: ", ctx->target, "\n", NULL);
+    }
+}
+
+static apr_status_t socache_dc_iterate(ap_socache_instance_t *instance,
+                                       server_rec *s, void *userctx,
+                                       ap_socache_iterator_t *iterator,
+                                       apr_pool_t *pool)
+{
+    return APR_ENOTIMPL;
+}
+
+static const ap_socache_provider_t socache_dc = {
+    "distcache",
+    0,
+    socache_dc_create,
+    socache_dc_init,
+    socache_dc_destroy,
+    socache_dc_store,
+    socache_dc_retrieve,
+    socache_dc_remove,
+    socache_dc_status,
+    socache_dc_iterate
+};
+
+static void register_hooks(apr_pool_t *p)
+{
+    ap_register_provider(p, AP_SOCACHE_PROVIDER_GROUP, "dc",
+                         AP_SOCACHE_PROVIDER_VERSION,
+                         &socache_dc);
+}
+
+AP_DECLARE_MODULE(socache_dc) = {
+    STANDARD20_MODULE_STUFF,
+    NULL, NULL, NULL, NULL, NULL,
+    register_hooks
+};
+