irmd: Move registry to its own sources

All registry functionality has been extracted from the IRMd to improve
modularity and legibility of the code.

1 files changed, 593 insertions, 0 deletions

diff --git a/src/irmd/registry.c b/src/irmd/registry.c
new file mode 100644
index 00000000..063309a4
--- /dev/null
+++ b/src/irmd/registry.c
@@ -0,0 +1,593 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * The IPC Resource Manager - Registry
+ *
+ *    Dimitri Staessens <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "registry.h"
+
+#include <ouroboros/config.h>
+
+#define OUROBOROS_PREFIX "registry"
+
+#include <ouroboros/logs.h>
+#include <ouroboros/irm_config.h>
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <errno.h>
+
+struct reg_instance * reg_instance_create(pid_t api)
+{
+        struct reg_instance * i;
+        i = malloc(sizeof(*i));
+        if (i == NULL)
+                return NULL;
+
+        i->api   = api;
+        i->state = REG_I_WAKE;
+
+        pthread_mutex_init(&i->mutex, NULL);
+        pthread_cond_init(&i->wakeup, NULL);
+
+        INIT_LIST_HEAD(&i->next);
+
+        return i;
+}
+
+void reg_instance_destroy(struct reg_instance * i)
+{
+        bool wait = true;
+        pthread_mutex_lock(&i->mutex);
+        i->state = REG_I_NULL;
+
+        pthread_cond_broadcast(&i->wakeup);
+        pthread_mutex_unlock(&i->mutex);
+
+        while (wait) {
+                pthread_mutex_lock(&i->mutex);
+                if (pthread_cond_destroy(&i->wakeup))
+                        pthread_cond_broadcast(&i->wakeup);
+                else
+                        wait = false;
+                pthread_mutex_unlock(&i->mutex);
+        }
+
+        pthread_mutex_destroy(&i->mutex);
+
+        free(i);
+}
+
+void reg_instance_sleep(struct reg_instance * i)
+{
+        pthread_mutex_lock(&i->mutex);
+        if (i->state != REG_I_WAKE) {
+                pthread_mutex_unlock(&i->mutex);
+                return;
+        }
+
+        i->state = REG_I_SLEEP;
+
+        pthread_cleanup_push((void(*)(void *)) pthread_mutex_unlock,
+                             (void *) &i->mutex);
+
+        while (i->state == REG_I_SLEEP)
+                pthread_cond_wait(&i->wakeup, &i->mutex);
+
+        pthread_cleanup_pop(true);
+}
+
+void reg_instance_wake(struct reg_instance * i)
+{
+        pthread_mutex_lock(&i->mutex);
+
+        if (i->state == REG_I_NULL) {
+                pthread_mutex_unlock(&i->mutex);
+                return;
+        }
+
+        i->state = REG_I_WAKE;
+
+        pthread_cond_signal(&i->wakeup);
+        pthread_mutex_unlock(&i->mutex);
+}
+
+struct reg_entry * reg_entry_create()
+{
+        struct reg_entry * e = malloc(sizeof(*e));
+        if (e == NULL)
+                return NULL;
+
+        e->name         = NULL;
+        e->state        = REG_NAME_NULL;
+        e->flags        = 0;
+
+        e->req_ae_name  = NULL;
+        e->response     = -1;
+
+        return e;
+}
+
+struct reg_entry * reg_entry_init(struct reg_entry * e,
+                                  char *             name,
+                                  char *             ap_name,
+                                  uint32_t           flags)
+{
+        struct reg_ap_name * n = NULL;
+
+        if (e == NULL || name == NULL || ap_name == NULL)
+                return NULL;
+
+        n = malloc(sizeof(*n));
+        if (n == NULL)
+                return NULL;
+
+        INIT_LIST_HEAD(&e->next);
+        INIT_LIST_HEAD(&e->ap_names);
+        INIT_LIST_HEAD(&e->auto_ap_info);
+        INIT_LIST_HEAD(&e->ap_instances);
+
+        e->name    = name;
+        e->flags   = flags;
+        n->ap_name = ap_name;
+
+        list_add(&n->next, &e->ap_names);
+
+        if (pthread_cond_init(&e->acc_signal, NULL)) {
+                free(e);
+                return NULL;
+        }
+
+        if (pthread_mutex_init(&e->state_lock, NULL)) {
+                free(e);
+                return NULL;
+        }
+
+        e->state = REG_NAME_IDLE;
+
+        return e;
+}
+
+void reg_entry_destroy(struct reg_entry * e)
+{
+        struct list_head * pos = NULL;
+        struct list_head * n   = NULL;
+
+        bool wait = true;
+
+        if (e == NULL)
+                return;
+
+        pthread_mutex_lock(&e->state_lock);
+
+        e->state = REG_NAME_NULL;
+
+        pthread_cond_broadcast(&e->acc_signal);
+        pthread_mutex_unlock(&e->state_lock);
+
+        while (wait) {
+                pthread_mutex_lock(&e->state_lock);
+                if (pthread_cond_destroy(&e->acc_signal))
+                        pthread_cond_broadcast(&e->acc_signal);
+                else
+                        wait = false;
+                pthread_mutex_unlock(&e->state_lock);
+        }
+
+        pthread_mutex_destroy(&e->state_lock);
+
+        if (e->name != NULL)
+                free(e->name);
+
+        if (e->req_ae_name != NULL)
+                free(e->req_ae_name);
+
+        list_for_each_safe(pos, n, &e->ap_instances) {
+                struct reg_instance * i =
+                        list_entry(pos, struct reg_instance, next);
+                reg_instance_destroy(i);
+        }
+
+        list_for_each_safe(pos, n, &e->auto_ap_info) {
+                struct reg_auto * a =
+                        list_entry(pos, struct reg_auto, next);
+
+                if (a->argv != NULL) {
+                        char ** t = a->argv;
+                        while (*a->argv != NULL)
+                                free(*(a->argv++));
+                        free(t);
+                }
+
+                free(a->ap_name);
+                free(a);
+        }
+
+        list_for_each_safe(pos, n, &e->ap_names) {
+                struct reg_ap_name * n =
+                        list_entry(pos, struct reg_ap_name, next);
+
+                free(n->ap_name);
+                free(n);
+        }
+
+        free(e);
+}
+
+struct reg_ap_name * reg_entry_get_ap_name(struct reg_entry * e,
+                                           char *             ap_name)
+{
+        struct list_head * pos = NULL;
+
+        list_for_each(pos, &e->ap_names) {
+                struct reg_ap_name * n =
+                        list_entry(pos, struct reg_ap_name, next);
+
+                if (strcmp(ap_name, n->ap_name) == 0)
+                        return n;
+        }
+
+        return NULL;
+}
+
+struct reg_instance * reg_entry_get_reg_instance(struct reg_entry * e,
+                                                 pid_t              api)
+{
+        struct list_head * pos = NULL;
+
+        list_for_each(pos, &e->ap_instances) {
+                struct reg_instance * r =
+                        list_entry(pos, struct reg_instance, next);
+
+                if (r->api == api)
+                        return r;
+        }
+
+        return NULL;
+}
+
+struct reg_auto * reg_entry_get_reg_auto(struct reg_entry * e,
+                                         char *             ap_name)
+{
+        struct list_head * pos = NULL;
+
+        list_for_each(pos, &e->auto_ap_info) {
+                struct reg_auto * a =
+                        list_entry(pos, struct reg_auto, next);
+
+                if (strcmp(ap_name, a->ap_name) == 0)
+                        return a;
+        }
+
+        return NULL;
+}
+
+pid_t reg_entry_resolve_api(struct reg_entry * e)
+{
+        struct list_head * pos = NULL;
+
+        /* FIXME: now just returns the first accepting instance */
+        list_for_each(pos, &e->ap_instances) {
+                struct reg_instance * r =
+                        list_entry(pos, struct reg_instance, next);
+                return r->api;
+        }
+
+        return 0;
+}
+
+char ** reg_entry_resolve_auto(struct reg_entry * e)
+{
+        struct list_head * pos = NULL;
+
+        /* FIXME: now just returns the first accepting instance */
+        list_for_each(pos, &e->auto_ap_info) {
+                struct reg_auto * r =
+                        list_entry(pos, struct reg_auto, next);
+                return r->argv;
+        }
+
+        return NULL;
+}
+
+struct reg_entry * registry_get_entry_by_name(struct list_head * registry,
+                                              char *             name)
+{
+        struct list_head * pos = NULL;
+
+        list_for_each(pos, registry) {
+                struct reg_entry * e =
+                        list_entry(pos, struct reg_entry, next);
+
+                if (strcmp(name, e->name) == 0)
+                        return e;
+        }
+
+        return NULL;
+}
+
+struct reg_entry * registry_get_entry_by_ap_name(struct list_head * registry,
+                                                 char *             ap_name)
+{
+        struct list_head * pos = NULL;
+
+        list_for_each(pos, registry) {
+                struct list_head * p = NULL;
+                struct reg_entry * e =
+                        list_entry(pos, struct reg_entry, next);
+
+                list_for_each(p, &e->ap_names) {
+                        struct reg_ap_name * n =
+                                list_entry(p, struct reg_ap_name, next);
+
+                        if (strcmp(n->ap_name, ap_name) == 0)
+                                return e;
+                }
+        }
+
+        return NULL;
+}
+
+struct reg_entry * registry_get_entry_by_ap_id(struct list_head * registry,
+                                               pid_t              api)
+{
+        struct list_head * pos = NULL;
+
+        list_for_each(pos, registry) {
+                struct list_head * p = NULL;
+                struct reg_entry * e =
+                        list_entry(pos, struct reg_entry, next);
+
+                list_for_each(p, &e->ap_instances) {
+                        struct reg_instance * r =
+                                list_entry(p, struct reg_instance, next);
+
+                        if (r->api == api)
+                                return e;
+                }
+        }
+
+        return NULL;
+}
+
+int registry_add_entry(struct list_head * registry,
+                       char *             name,
+                       char *             ap_name,
+                       uint16_t           flags)
+{
+        struct reg_entry * e = NULL;
+
+        if (name == NULL || ap_name == NULL)
+                return -EINVAL;
+
+        e = registry_get_entry_by_name(registry, name);
+        if (e != NULL) {
+                LOG_DBG("Name %s already registered.", name);
+                return -1;
+        }
+
+        e = reg_entry_create();
+        if (e == NULL) {
+                LOG_DBG("Could not create registry entry.");
+                return -1;
+        }
+
+        e = reg_entry_init(e, name, ap_name, flags);
+        if (e == NULL) {
+                LOG_DBG("Could not initialize registry entry.");
+                reg_entry_destroy(e);
+                return -1;
+        }
+
+        list_add(&e->next, registry);
+
+        return 0;
+}
+
+int registry_add_ap_auto(struct list_head * registry,
+                         char *             name,
+                         char *             ap_name,
+                         char **            argv)
+{
+        struct reg_entry * e;
+        struct reg_auto * a;
+
+        if (name == NULL || ap_name == NULL)
+                return -EINVAL;
+
+        e = registry_get_entry_by_name(registry, name);
+        if (e == NULL) {
+                LOG_DBG("Name %s not found in registry.", name);
+                return -1;
+        }
+
+        if (!(e->flags & BIND_AP_AUTO)) {
+                LOG_DBG("%s does not allow auto-instantiation.", name);
+                return -1;
+        }
+
+        if (!reg_entry_has_ap_name(e, ap_name)) {
+                LOG_DBG("AP name %s not associated with %s.", ap_name, name);
+                return -1;
+        }
+
+        if (e->state == REG_NAME_NULL) {
+                LOG_DBG("Tried to add instantiation info in NULL state.");
+                return -1;
+        }
+
+        a = reg_entry_get_reg_auto(e, ap_name);
+        if (a != NULL) {
+                LOG_DBG("Updating auto-instantiation info for %s.", ap_name);
+                list_del(&a->next);
+                free(a->ap_name);
+                if (a->argv != NULL) {
+                        while (*a->argv != NULL)
+                                free(*a->argv++);
+                }
+        } else {
+                a = malloc(sizeof(*a));
+                if (a == NULL)
+                        return -1;
+        }
+
+        a->ap_name = ap_name;
+        a->argv    = argv;
+
+        if (e->state == REG_NAME_IDLE)
+                e->state = REG_NAME_AUTO_ACCEPT;
+
+        list_add(&a->next, &e->auto_ap_info);
+
+        return 0;
+}
+
+
+int registry_remove_ap_auto(struct list_head * registry,
+                            char *             name,
+                            char *             ap_name)
+{
+        struct reg_entry * e;
+        struct reg_auto * a;
+
+        if (name == NULL || ap_name == NULL)
+                return -EINVAL;
+
+        e = registry_get_entry_by_name(registry, name);
+        if (e == NULL) {
+                LOG_DBG("Name %s not found in registry.", name);
+                return -1;
+        }
+
+        a = reg_entry_get_reg_auto(e, ap_name);
+        if (a == NULL) {
+                LOG_DBG("Auto-instantiation info for %s not found.", ap_name);
+                return -1;
+        }
+
+        list_del(&a->next);
+
+        if (e->state == REG_NAME_AUTO_ACCEPT && list_empty(&e->auto_ap_info))
+                e->state = REG_NAME_IDLE;
+
+        return 0;
+}
+
+
+struct reg_instance * registry_add_ap_instance(struct list_head * registry,
+                                               char *             name,
+                                               pid_t              api)
+{
+        struct reg_entry * e    = NULL;
+        struct reg_instance * i = NULL;
+
+        if (name == NULL || api == 0)
+                return NULL;
+
+        e = registry_get_entry_by_name(registry, name);
+        if (e == NULL) {
+                LOG_DBG("Name %s not found in registry.", name);
+                return NULL;
+        }
+
+        if (api == 0) {
+                LOG_DBG("Invalid api.");
+                return NULL;
+        }
+
+        if (reg_entry_has_api(e, api)) {
+                LOG_DBG("Instance already registered with this name.");
+                return NULL;
+        }
+
+        if (e->state == REG_NAME_NULL) {
+                LOG_DBG("Tried to add instance in NULL state.");
+                return NULL;
+        }
+
+        i = reg_instance_create(api);
+        if (i == NULL) {
+                LOG_DBG("Failed to create reg_instance");
+                return NULL;
+        }
+
+        if (e->state == REG_NAME_IDLE || e->state == REG_NAME_AUTO_ACCEPT
+           || e->state == REG_NAME_AUTO_EXEC) {
+                e->state = REG_NAME_FLOW_ACCEPT;
+                pthread_cond_signal(&e->acc_signal);
+        }
+
+        list_add(&i->next, &e->ap_instances);
+
+        return i;
+}
+
+int registry_remove_ap_instance(struct list_head * registry,
+                                char *             name,
+                                pid_t              api)
+{
+        struct reg_entry * e    = NULL;
+        struct reg_instance * i = NULL;
+
+        if (name == NULL || api == 0)
+                return -1;
+
+        e = registry_get_entry_by_name(registry, name);
+        if (e == NULL) {
+                LOG_DBG("Name %s is not registered.", name);
+                return -1;
+        }
+
+        i = reg_entry_get_reg_instance(e, api);
+        if (i == NULL) {
+                LOG_DBG("Instance %d is not accepting flows for %s.",
+                         api, name);
+                return -1;
+        }
+
+        list_del(&i->next);
+
+        reg_instance_destroy(i);
+
+        if (list_empty(&e->ap_instances)) {
+                if ((e->flags & BIND_AP_AUTO) &&
+                        !list_empty(&e->auto_ap_info))
+                        e->state = REG_NAME_AUTO_ACCEPT;
+                else
+                        e->state = REG_NAME_IDLE;
+        } else {
+                e->state = REG_NAME_FLOW_ACCEPT;
+        }
+
+        return 0;
+}
+
+void registry_del_name(struct list_head * registry,
+                       char *             name)
+{
+        struct reg_entry * e = registry_get_entry_by_name(registry, name);
+        if (e == NULL)
+                return;
+
+        list_del(&e->next);
+        reg_entry_destroy(e);
+
+        return;
+}