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-rw-r--r--modules/http2/h2_conn.c370
1 files changed, 370 insertions, 0 deletions
diff --git a/modules/http2/h2_conn.c b/modules/http2/h2_conn.c
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+++ b/modules/http2/h2_conn.c
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+/* 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 <assert.h>
+#include <apr_strings.h>
+
+#include <ap_mpm.h>
+
+#include <httpd.h>
+#include <http_core.h>
+#include <http_config.h>
+#include <http_log.h>
+#include <http_connection.h>
+#include <http_protocol.h>
+#include <http_request.h>
+
+#include <mpm_common.h>
+
+#include "h2_private.h"
+#include "h2.h"
+#include "h2_config.h"
+#include "h2_ctx.h"
+#include "h2_filter.h"
+#include "h2_mplx.h"
+#include "h2_session.h"
+#include "h2_stream.h"
+#include "h2_h2.h"
+#include "h2_task.h"
+#include "h2_workers.h"
+#include "h2_conn.h"
+#include "h2_version.h"
+
+static struct h2_workers *workers;
+
+static h2_mpm_type_t mpm_type = H2_MPM_UNKNOWN;
+static module *mpm_module;
+static int async_mpm;
+static int mpm_supported = 1;
+static apr_socket_t *dummy_socket;
+
+static void check_modules(int force)
+{
+ static int checked = 0;
+ int i;
+
+ if (force || !checked) {
+ for (i = 0; ap_loaded_modules[i]; ++i) {
+ module *m = ap_loaded_modules[i];
+
+ if (!strcmp("event.c", m->name)) {
+ mpm_type = H2_MPM_EVENT;
+ mpm_module = m;
+ break;
+ }
+ else if (!strcmp("motorz.c", m->name)) {
+ mpm_type = H2_MPM_MOTORZ;
+ mpm_module = m;
+ break;
+ }
+ else if (!strcmp("mpm_netware.c", m->name)) {
+ mpm_type = H2_MPM_NETWARE;
+ mpm_module = m;
+ break;
+ }
+ else if (!strcmp("prefork.c", m->name)) {
+ mpm_type = H2_MPM_PREFORK;
+ mpm_module = m;
+ /* While http2 can work really well on prefork, it collides
+ * today's use case for prefork: runnning single-thread app engines
+ * like php. If we restrict h2_workers to 1 per process, php will
+ * work fine, but browser will be limited to 1 active request at a
+ * time. */
+ mpm_supported = 0;
+ break;
+ }
+ else if (!strcmp("simple_api.c", m->name)) {
+ mpm_type = H2_MPM_SIMPLE;
+ mpm_module = m;
+ mpm_supported = 0;
+ break;
+ }
+ else if (!strcmp("mpm_winnt.c", m->name)) {
+ mpm_type = H2_MPM_WINNT;
+ mpm_module = m;
+ break;
+ }
+ else if (!strcmp("worker.c", m->name)) {
+ mpm_type = H2_MPM_WORKER;
+ mpm_module = m;
+ break;
+ }
+ }
+ checked = 1;
+ }
+}
+
+apr_status_t h2_conn_child_init(apr_pool_t *pool, server_rec *s)
+{
+ const h2_config *config = h2_config_sget(s);
+ apr_status_t status = APR_SUCCESS;
+ int minw, maxw;
+ int max_threads_per_child = 0;
+ int idle_secs = 0;
+
+ check_modules(1);
+ ap_mpm_query(AP_MPMQ_MAX_THREADS, &max_threads_per_child);
+
+ status = ap_mpm_query(AP_MPMQ_IS_ASYNC, &async_mpm);
+ if (status != APR_SUCCESS) {
+ /* some MPMs do not implemnent this */
+ async_mpm = 0;
+ status = APR_SUCCESS;
+ }
+
+ h2_config_init(pool);
+
+ h2_get_num_workers(s, &minw, &maxw);
+
+ idle_secs = h2_config_geti(config, H2_CONF_MAX_WORKER_IDLE_SECS);
+ ap_log_error(APLOG_MARK, APLOG_TRACE3, 0, s,
+ "h2_workers: min=%d max=%d, mthrpchild=%d, idle_secs=%d",
+ minw, maxw, max_threads_per_child, idle_secs);
+ workers = h2_workers_create(s, pool, minw, maxw, idle_secs);
+
+ ap_register_input_filter("H2_IN", h2_filter_core_input,
+ NULL, AP_FTYPE_CONNECTION);
+
+ status = h2_mplx_child_init(pool, s);
+
+ if (status == APR_SUCCESS) {
+ status = apr_socket_create(&dummy_socket, APR_INET, SOCK_STREAM,
+ APR_PROTO_TCP, pool);
+ }
+
+ return status;
+}
+
+h2_mpm_type_t h2_conn_mpm_type(void)
+{
+ check_modules(0);
+ return mpm_type;
+}
+
+const char *h2_conn_mpm_name(void)
+{
+ check_modules(0);
+ return mpm_module? mpm_module->name : "unknown";
+}
+
+int h2_mpm_supported(void)
+{
+ check_modules(0);
+ return mpm_supported;
+}
+
+static module *h2_conn_mpm_module(void)
+{
+ check_modules(0);
+ return mpm_module;
+}
+
+apr_status_t h2_conn_setup(h2_ctx *ctx, conn_rec *c, request_rec *r)
+{
+ h2_session *session;
+ apr_status_t status;
+
+ if (!workers) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(02911)
+ "workers not initialized");
+ return APR_EGENERAL;
+ }
+
+ if (r) {
+ status = h2_session_rcreate(&session, r, ctx, workers);
+ }
+ else {
+ status = h2_session_create(&session, c, ctx, workers);
+ }
+
+ if (status == APR_SUCCESS) {
+ h2_ctx_session_set(ctx, session);
+ }
+ return status;
+}
+
+apr_status_t h2_conn_run(struct h2_ctx *ctx, conn_rec *c)
+{
+ apr_status_t status;
+ int mpm_state = 0;
+ h2_session *session = h2_ctx_session_get(ctx);
+
+ ap_assert(session);
+ do {
+ if (c->cs) {
+ c->cs->sense = CONN_SENSE_DEFAULT;
+ c->cs->state = CONN_STATE_HANDLER;
+ }
+
+ status = h2_session_process(session, async_mpm);
+
+ if (APR_STATUS_IS_EOF(status)) {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, c,
+ H2_SSSN_LOG(APLOGNO(03045), session,
+ "process, closing conn"));
+ c->keepalive = AP_CONN_CLOSE;
+ }
+ else {
+ c->keepalive = AP_CONN_KEEPALIVE;
+ }
+
+ if (ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state)) {
+ break;
+ }
+ } while (!async_mpm
+ && c->keepalive == AP_CONN_KEEPALIVE
+ && mpm_state != AP_MPMQ_STOPPING);
+
+ if (c->cs) {
+ switch (session->state) {
+ case H2_SESSION_ST_INIT:
+ case H2_SESSION_ST_IDLE:
+ case H2_SESSION_ST_BUSY:
+ case H2_SESSION_ST_WAIT:
+ c->cs->state = CONN_STATE_WRITE_COMPLETION;
+ break;
+ case H2_SESSION_ST_CLEANUP:
+ case H2_SESSION_ST_DONE:
+ default:
+ c->cs->state = CONN_STATE_LINGER;
+ break;
+ }
+ }
+
+ return APR_SUCCESS;
+}
+
+apr_status_t h2_conn_pre_close(struct h2_ctx *ctx, conn_rec *c)
+{
+ h2_session *session = h2_ctx_session_get(ctx);
+ if (session) {
+ apr_status_t status = h2_session_pre_close(session, async_mpm);
+ return (status == APR_SUCCESS)? DONE : status;
+ }
+ return DONE;
+}
+
+conn_rec *h2_slave_create(conn_rec *master, int slave_id, apr_pool_t *parent)
+{
+ apr_allocator_t *allocator;
+ apr_status_t status;
+ apr_pool_t *pool;
+ conn_rec *c;
+ void *cfg;
+ module *mpm;
+
+ ap_assert(master);
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, master,
+ "h2_stream(%ld-%d): create slave", master->id, slave_id);
+
+ /* We create a pool with its own allocator to be used for
+ * processing a request. This is the only way to have the processing
+ * independant of its parent pool in the sense that it can work in
+ * another thread. Also, the new allocator needs its own mutex to
+ * synchronize sub-pools.
+ */
+ apr_allocator_create(&allocator);
+ apr_allocator_max_free_set(allocator, ap_max_mem_free);
+ status = apr_pool_create_ex(&pool, parent, NULL, allocator);
+ if (status != APR_SUCCESS) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, status, master,
+ APLOGNO(10004) "h2_session(%ld-%d): create slave pool",
+ master->id, slave_id);
+ return NULL;
+ }
+ apr_allocator_owner_set(allocator, pool);
+ apr_pool_tag(pool, "h2_slave_conn");
+
+ c = (conn_rec *) apr_palloc(pool, sizeof(conn_rec));
+ if (c == NULL) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_ENOMEM, master,
+ APLOGNO(02913) "h2_session(%ld-%d): create slave",
+ master->id, slave_id);
+ apr_pool_destroy(pool);
+ return NULL;
+ }
+
+ memcpy(c, master, sizeof(conn_rec));
+
+ c->master = master;
+ c->pool = pool;
+ c->conn_config = ap_create_conn_config(pool);
+ c->notes = apr_table_make(pool, 5);
+ c->input_filters = NULL;
+ c->output_filters = NULL;
+ c->bucket_alloc = apr_bucket_alloc_create(pool);
+ c->data_in_input_filters = 0;
+ c->data_in_output_filters = 0;
+ /* prevent mpm_event from making wrong assumptions about this connection,
+ * like e.g. using its socket for an async read check. */
+ c->clogging_input_filters = 1;
+ c->log = NULL;
+ c->log_id = apr_psprintf(pool, "%ld-%d",
+ master->id, slave_id);
+ c->aborted = 0;
+ /* We cannot install the master connection socket on the slaves, as
+ * modules mess with timeouts/blocking of the socket, with
+ * unwanted side effects to the master connection processing.
+ * Fortunately, since we never use the slave socket, we can just install
+ * a single, process-wide dummy and everyone is happy.
+ */
+ ap_set_module_config(c->conn_config, &core_module, dummy_socket);
+ /* TODO: these should be unique to this thread */
+ c->sbh = master->sbh;
+ /* TODO: not all mpm modules have learned about slave connections yet.
+ * copy their config from master to slave.
+ */
+ if ((mpm = h2_conn_mpm_module()) != NULL) {
+ cfg = ap_get_module_config(master->conn_config, mpm);
+ ap_set_module_config(c->conn_config, mpm, cfg);
+ }
+
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c,
+ "h2_stream(%ld-%d): created slave", master->id, slave_id);
+ return c;
+}
+
+void h2_slave_destroy(conn_rec *slave)
+{
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, slave,
+ "h2_stream(%s): destroy slave",
+ apr_table_get(slave->notes, H2_TASK_ID_NOTE));
+ slave->sbh = NULL;
+ apr_pool_destroy(slave->pool);
+}
+
+apr_status_t h2_slave_run_pre_connection(conn_rec *slave, apr_socket_t *csd)
+{
+ if (slave->keepalives == 0) {
+ /* Simulate that we had already a request on this connection. Some
+ * hooks trigger special behaviour when keepalives is 0.
+ * (Not necessarily in pre_connection, but later. Set it here, so it
+ * is in place.) */
+ slave->keepalives = 1;
+ /* We signal that this connection will be closed after the request.
+ * Which is true in that sense that we throw away all traffic data
+ * on this slave connection after each requests. Although we might
+ * reuse internal structures like memory pools.
+ * The wanted effect of this is that httpd does not try to clean up
+ * any dangling data on this connection when a request is done. Which
+ * is unneccessary on a h2 stream.
+ */
+ slave->keepalive = AP_CONN_CLOSE;
+ return ap_run_pre_connection(slave, csd);
+ }
+ return APR_SUCCESS;
+}
+
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