diff options
Diffstat (limited to 'modules/http2/h2_ngn_shed.c')
| -rw-r--r-- | modules/http2/h2_ngn_shed.c | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/modules/http2/h2_ngn_shed.c b/modules/http2/h2_ngn_shed.c new file mode 100644 index 00000000..f0676421 --- /dev/null +++ b/modules/http2/h2_ngn_shed.c @@ -0,0 +1,366 @@ +/* Copyright 2015 greenbytes GmbH (https://www.greenbytes.de) + * + * Licensed 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 <stddef.h> +#include <stdlib.h> + +#include <apr_thread_mutex.h> +#include <apr_thread_cond.h> +#include <apr_strings.h> +#include <apr_time.h> + +#include <httpd.h> +#include <http_core.h> +#include <http_log.h> + +#include "mod_http2.h" + +#include "h2_private.h" +#include "h2.h" +#include "h2_config.h" +#include "h2_conn.h" +#include "h2_ctx.h" +#include "h2_h2.h" +#include "h2_mplx.h" +#include "h2_response.h" +#include "h2_request.h" +#include "h2_task.h" +#include "h2_util.h" +#include "h2_ngn_shed.h" + + +typedef struct h2_ngn_entry h2_ngn_entry; +struct h2_ngn_entry { + APR_RING_ENTRY(h2_ngn_entry) link; + h2_task *task; +}; + +#define H2_NGN_ENTRY_NEXT(e) APR_RING_NEXT((e), link) +#define H2_NGN_ENTRY_PREV(e) APR_RING_PREV((e), link) +#define H2_NGN_ENTRY_REMOVE(e) APR_RING_REMOVE((e), link) + +#define H2_REQ_ENTRIES_SENTINEL(b) APR_RING_SENTINEL((b), h2_ngn_entry, link) +#define H2_REQ_ENTRIES_EMPTY(b) APR_RING_EMPTY((b), h2_ngn_entry, link) +#define H2_REQ_ENTRIES_FIRST(b) APR_RING_FIRST(b) +#define H2_REQ_ENTRIES_LAST(b) APR_RING_LAST(b) + +#define H2_REQ_ENTRIES_INSERT_HEAD(b, e) do { \ +h2_ngn_entry *ap__b = (e); \ +APR_RING_INSERT_HEAD((b), ap__b, h2_ngn_entry, link); \ +} while (0) + +#define H2_REQ_ENTRIES_INSERT_TAIL(b, e) do { \ +h2_ngn_entry *ap__b = (e); \ +APR_RING_INSERT_TAIL((b), ap__b, h2_ngn_entry, link); \ +} while (0) + +struct h2_req_engine { + const char *id; /* identifier */ + const char *type; /* name of the engine type */ + apr_pool_t *pool; /* pool for engine specific allocations */ + conn_rec *c; /* connection this engine is assigned to */ + h2_task *task; /* the task this engine is base on, running in */ + h2_ngn_shed *shed; + + unsigned int shutdown : 1; /* engine is being shut down */ + unsigned int done : 1; /* engine has finished */ + + APR_RING_HEAD(h2_req_entries, h2_ngn_entry) entries; + apr_uint32_t capacity; /* maximum concurrent requests */ + apr_uint32_t no_assigned; /* # of assigned requests */ + apr_uint32_t no_live; /* # of live */ + apr_uint32_t no_finished; /* # of finished */ + + h2_output_consumed *out_consumed; + void *out_consumed_ctx; +}; + +const char *h2_req_engine_get_id(h2_req_engine *engine) +{ + return engine->id; +} + +int h2_req_engine_is_shutdown(h2_req_engine *engine) +{ + return engine->shutdown; +} + +void h2_req_engine_out_consumed(h2_req_engine *engine, conn_rec *c, + apr_off_t bytes) +{ + if (engine->out_consumed) { + engine->out_consumed(engine->out_consumed_ctx, c, bytes); + } +} + +h2_ngn_shed *h2_ngn_shed_create(apr_pool_t *pool, conn_rec *c, + apr_uint32_t default_capacity, + apr_uint32_t req_buffer_size) +{ + h2_ngn_shed *shed; + + shed = apr_pcalloc(pool, sizeof(*shed)); + shed->c = c; + shed->pool = pool; + shed->default_capacity = default_capacity; + shed->req_buffer_size = req_buffer_size; + shed->ngns = apr_hash_make(pool); + + return shed; +} + +void h2_ngn_shed_set_ctx(h2_ngn_shed *shed, void *user_ctx) +{ + shed->user_ctx = user_ctx; +} + +void *h2_ngn_shed_get_ctx(h2_ngn_shed *shed) +{ + return shed->user_ctx; +} + +h2_ngn_shed *h2_ngn_shed_get_shed(h2_req_engine *ngn) +{ + return ngn->shed; +} + +void h2_ngn_shed_abort(h2_ngn_shed *shed) +{ + ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, shed->c, APLOGNO(03394) + "h2_ngn_shed(%ld): abort", shed->c->id); + shed->aborted = 1; +} + +static void ngn_add_task(h2_req_engine *ngn, h2_task *task) +{ + h2_ngn_entry *entry = apr_pcalloc(task->pool, sizeof(*entry)); + APR_RING_ELEM_INIT(entry, link); + entry->task = task; + H2_REQ_ENTRIES_INSERT_TAIL(&ngn->entries, entry); +} + + +apr_status_t h2_ngn_shed_push_task(h2_ngn_shed *shed, const char *ngn_type, + h2_task *task, http2_req_engine_init *einit) +{ + h2_req_engine *ngn; + + AP_DEBUG_ASSERT(shed); + + ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, shed->c, + "h2_ngn_shed(%ld): PUSHing request (task=%s)", shed->c->id, + task->id); + if (task->ser_headers) { + /* Max compatibility, deny processing of this */ + return APR_EOF; + } + + ngn = apr_hash_get(shed->ngns, ngn_type, APR_HASH_KEY_STRING); + if (ngn && !ngn->shutdown) { + /* this task will be processed in another thread, + * freeze any I/O for the time being. */ + ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, task->c, + "h2_ngn_shed(%ld): pushing request %s to %s", + shed->c->id, task->id, ngn->id); + if (!h2_task_is_detached(task)) { + h2_task_freeze(task); + } + /* FIXME: sometimes ngn is garbage, probly alread freed */ + ngn_add_task(ngn, task); + ngn->no_assigned++; + return APR_SUCCESS; + } + + /* no existing engine or being shut down, start a new one */ + if (einit) { + apr_status_t status; + apr_pool_t *pool = task->pool; + h2_req_engine *newngn; + + newngn = apr_pcalloc(pool, sizeof(*ngn)); + newngn->pool = pool; + newngn->id = apr_psprintf(pool, "ngn-%s", task->id); + newngn->type = apr_pstrdup(pool, ngn_type); + newngn->c = task->c; + newngn->shed = shed; + newngn->capacity = shed->default_capacity; + newngn->no_assigned = 1; + newngn->no_live = 1; + APR_RING_INIT(&newngn->entries, h2_ngn_entry, link); + + status = einit(newngn, newngn->id, newngn->type, newngn->pool, + shed->req_buffer_size, task->r, + &newngn->out_consumed, &newngn->out_consumed_ctx); + ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, task->c, APLOGNO(03395) + "h2_ngn_shed(%ld): create engine %s (%s)", + shed->c->id, newngn->id, newngn->type); + if (status == APR_SUCCESS) { + AP_DEBUG_ASSERT(task->engine == NULL); + newngn->task = task; + task->engine = newngn; + task->assigned = newngn; + apr_hash_set(shed->ngns, newngn->type, APR_HASH_KEY_STRING, newngn); + } + return status; + } + return APR_EOF; +} + +static h2_ngn_entry *pop_detached(h2_req_engine *ngn) +{ + h2_ngn_entry *entry; + for (entry = H2_REQ_ENTRIES_FIRST(&ngn->entries); + entry != H2_REQ_ENTRIES_SENTINEL(&ngn->entries); + entry = H2_NGN_ENTRY_NEXT(entry)) { + if (h2_task_is_detached(entry->task) + || (entry->task->engine == ngn)) { + /* The task hosting this engine can always be pulled by it. + * For other task, they need to become detached, e.g. no longer + * assigned to another worker. */ + H2_NGN_ENTRY_REMOVE(entry); + return entry; + } + } + return NULL; +} + +apr_status_t h2_ngn_shed_pull_task(h2_ngn_shed *shed, + h2_req_engine *ngn, + apr_uint32_t capacity, + int want_shutdown, + h2_task **ptask) +{ + h2_ngn_entry *entry; + + AP_DEBUG_ASSERT(ngn); + *ptask = NULL; + ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, shed->c, APLOGNO(03396) + "h2_ngn_shed(%ld): pull task for engine %s, shutdown=%d", + shed->c->id, ngn->id, want_shutdown); + if (shed->aborted) { + ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, shed->c, APLOGNO(03397) + "h2_ngn_shed(%ld): abort while pulling requests %s", + shed->c->id, ngn->id); + ngn->shutdown = 1; + return APR_ECONNABORTED; + } + + ngn->capacity = capacity; + if (H2_REQ_ENTRIES_EMPTY(&ngn->entries)) { + if (want_shutdown) { + ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, shed->c, + "h2_ngn_shed(%ld): emtpy queue, shutdown engine %s", + shed->c->id, ngn->id); + ngn->shutdown = 1; + } + return ngn->shutdown? APR_EOF : APR_EAGAIN; + } + + if ((entry = pop_detached(ngn))) { + ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, entry->task->c, APLOGNO(03398) + "h2_ngn_shed(%ld): pulled request %s for engine %s", + shed->c->id, entry->task->id, ngn->id); + ngn->no_live++; + *ptask = entry->task; + entry->task->assigned = ngn; + /* task will now run in ngn's own thread. Modules like lua + * seem to require the correct thread set in the conn_rec. + * See PR 59542. */ + if (entry->task->c && ngn->c) { + entry->task->c->current_thread = ngn->c->current_thread; + } + if (entry->task->engine == ngn) { + /* If an engine pushes its own base task, and then pulls + * it back to itself again, it needs to be thawed. + */ + h2_task_thaw(entry->task); + } + return APR_SUCCESS; + } + + if (1) { + h2_ngn_entry *entry = H2_REQ_ENTRIES_FIRST(&ngn->entries); + ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, shed->c, APLOGNO(03399) + "h2_ngn_shed(%ld): pull task, nothing, first task %s", + shed->c->id, entry->task->id); + } + return APR_EAGAIN; +} + +static apr_status_t ngn_done_task(h2_ngn_shed *shed, h2_req_engine *ngn, + h2_task *task, int waslive, int aborted) +{ + ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, shed->c, APLOGNO(03400) + "h2_ngn_shed(%ld): task %s %s by %s", + shed->c->id, task->id, aborted? "aborted":"done", ngn->id); + ngn->no_finished++; + if (waslive) ngn->no_live--; + ngn->no_assigned--; + task->assigned = NULL; + + return APR_SUCCESS; +} + +apr_status_t h2_ngn_shed_done_task(h2_ngn_shed *shed, + struct h2_req_engine *ngn, h2_task *task) +{ + return ngn_done_task(shed, ngn, task, 1, 0); +} + +void h2_ngn_shed_done_ngn(h2_ngn_shed *shed, struct h2_req_engine *ngn) +{ + if (ngn->done) { + return; + } + + if (!shed->aborted && !H2_REQ_ENTRIES_EMPTY(&ngn->entries)) { + h2_ngn_entry *entry; + ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, shed->c, + "h2_ngn_shed(%ld): exit engine %s (%s), " + "has still requests queued, shutdown=%d," + "assigned=%ld, live=%ld, finished=%ld", + shed->c->id, ngn->id, ngn->type, + ngn->shutdown, + (long)ngn->no_assigned, (long)ngn->no_live, + (long)ngn->no_finished); + for (entry = H2_REQ_ENTRIES_FIRST(&ngn->entries); + entry != H2_REQ_ENTRIES_SENTINEL(&ngn->entries); + entry = H2_NGN_ENTRY_NEXT(entry)) { + h2_task *task = entry->task; + ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, shed->c, + "h2_ngn_shed(%ld): engine %s has queued task %s, " + "frozen=%d, aborting", + shed->c->id, ngn->id, task->id, task->frozen); + ngn_done_task(shed, ngn, task, 0, 1); + } + } + if (!shed->aborted && (ngn->no_assigned > 1 || ngn->no_live > 1)) { + ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, shed->c, + "h2_ngn_shed(%ld): exit engine %s (%s), " + "assigned=%ld, live=%ld, finished=%ld", + shed->c->id, ngn->id, ngn->type, + (long)ngn->no_assigned, (long)ngn->no_live, + (long)ngn->no_finished); + } + else { + ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, shed->c, + "h2_ngn_shed(%ld): exit engine %s", + shed->c->id, ngn->id); + } + + apr_hash_set(shed->ngns, ngn->type, APR_HASH_KEY_STRING, NULL); + ngn->done = 1; +} |