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-rw-r--r--src/lib/cdap.c438
1 files changed, 438 insertions, 0 deletions
diff --git a/src/lib/cdap.c b/src/lib/cdap.c
index e69de29b..4275bfc7 100644
--- a/src/lib/cdap.c
+++ b/src/lib/cdap.c
@@ -0,0 +1,438 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * The Common Distributed Application Protocol
+ *
+ * Sander Vrijders <sander.vrijders@intec.ugent.be>
+ *
+ * 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 <ouroboros/cdap.h>
+#include <ouroboros/bitmap.h>
+#include <ouroboros/common.h>
+#include <ouroboros/dev.h>
+
+#include <stdlib.h>
+#include <pthread.h>
+
+#include "cdap.pb-c.h"
+typedef Cdap cdap_t;
+typedef Opcode opcode_t;
+
+#define IDS_SIZE 256
+#define BUF_SIZE 2048
+
+struct cdap {
+ int fd;
+ struct bmp * ids;
+ pthread_mutex_t ids_lock;
+ pthread_t reader;
+ struct cdap_ops * ops;
+};
+
+
+static ssize_t cdap_msg_to_buffer(cdap_t * msg,
+ buffer_t ** val)
+{
+ int i;
+ size_t len;
+
+ len = msg->n_value;
+
+ *val = malloc(len * sizeof(**val));
+ if (*val == NULL)
+ return -1;
+
+ for (i = 0; i < len; i++) {
+ if (msg->value[i].data == NULL) {
+ free(*val);
+ return -1;
+ }
+
+ (*val)[i].data = msg->value[i].data;
+ (*val)[i].len = msg->value[i].len;
+ }
+
+ return len;
+}
+
+
+static void * sdu_reader(void * o)
+{
+ struct cdap * instance = (struct cdap *) o;
+ cdap_t * msg;
+ uint8_t buf[BUF_SIZE];
+ ssize_t len;
+ ssize_t length;
+ buffer_t * val;
+
+ while (true) {
+ len = flow_read(instance->fd, buf, BUF_SIZE);
+ if (len < 0)
+ return (void *) -1;
+
+ msg = cdap__unpack(NULL, len, buf);
+ if (msg == NULL)
+ continue;
+
+ switch (msg->opcode) {
+ case OPCODE__READ:
+ if (msg->name != NULL)
+ instance->ops->cdap_read(instance,
+ msg->name);
+ break;
+ case OPCODE__WRITE:
+ length = cdap_msg_to_buffer(msg, &val);
+ if (msg->name != NULL &&
+ msg->value != NULL &&
+ len > 0) {
+ instance->ops->cdap_write(instance,
+ msg->name,
+ val,
+ length,
+ msg->flags);
+ free(val);
+ }
+ break;
+ case OPCODE__CREATE:
+ length = cdap_msg_to_buffer(msg, &val);
+ if (msg->name != NULL &&
+ length == 1) {
+ instance->ops->cdap_create(instance,
+ msg->name,
+ val[0]);
+ free(val);
+ }
+ break;
+ case OPCODE__DELETE:
+ length = cdap_msg_to_buffer(msg, &val);
+ if (msg->name != NULL &&
+ length == 1) {
+ instance->ops->cdap_create(instance,
+ msg->name,
+ val[0]);
+ free(val);
+ }
+ break;
+ case OPCODE__START:
+ if (msg->name != NULL)
+ instance->ops->cdap_start(instance,
+ msg->name);
+ break;
+ case OPCODE__STOP:
+ if (msg->name != NULL)
+ instance->ops->cdap_stop(instance,
+ msg->name);
+ break;
+ case OPCODE__REPLY:
+ length = cdap_msg_to_buffer(msg, &val);
+ if (msg->name != NULL &&
+ length > 0) {
+ instance->ops->cdap_reply(instance,
+ msg->invoke_id,
+ msg->result,
+ val,
+ length);
+ free(val);
+ }
+ break;
+ default:
+ break;
+ }
+
+ cdap__free_unpacked(msg, NULL);
+ }
+
+ return (void *) 0;
+}
+
+struct cdap * cdap_create(struct cdap_ops * ops,
+ int fd)
+{
+ struct cdap * instance = NULL;
+ int flags;
+
+ if (ops == NULL || fd < 0 ||
+ ops->cdap_reply == NULL ||
+ ops->cdap_read == NULL ||
+ ops->cdap_write == NULL ||
+ ops->cdap_create == NULL ||
+ ops->cdap_delete == NULL ||
+ ops->cdap_start == NULL ||
+ ops->cdap_stop == NULL)
+ return NULL;
+
+ flags = flow_cntl(fd, FLOW_F_GETFL, 0);
+ if (flags & FLOW_O_NONBLOCK)
+ return NULL;
+
+ instance = malloc(sizeof(*instance));
+ if (instance == NULL)
+ return NULL;
+
+ if (pthread_mutex_init(&instance->ids_lock, NULL)) {
+ free(instance);
+ return NULL;
+ }
+
+ instance->ops = ops;
+
+ instance->ids = bmp_create(IDS_SIZE, 0);
+ if (instance->ids == NULL) {
+ free(instance);
+ return NULL;
+ }
+
+ pthread_create(&instance->reader,
+ NULL,
+ sdu_reader,
+ (void *) instance);
+
+ return instance;
+}
+
+int cdap_destroy(struct cdap * instance)
+{
+ if (instance == NULL)
+ return -1;
+
+ pthread_cancel(instance->reader);
+
+ pthread_mutex_lock(&instance->ids_lock);
+
+ bmp_destroy(instance->ids);
+
+ pthread_mutex_unlock(&instance->ids_lock);
+
+ pthread_join(instance->reader,
+ NULL);
+
+ free(instance);
+
+ return 0;
+}
+
+static int next_invoke_id(struct cdap * instance)
+{
+ int ret;
+
+ pthread_mutex_lock(&instance->ids_lock);
+ ret = bmp_allocate(instance->ids);
+ pthread_mutex_unlock(&instance->ids_lock);
+
+ return ret;
+}
+
+static int release_invoke_id(struct cdap * instance,
+ int id)
+{
+ int ret;
+
+ pthread_mutex_lock(&instance->ids_lock);
+ ret = bmp_release(instance->ids, id);
+ pthread_mutex_unlock(&instance->ids_lock);
+
+ return ret;
+}
+
+static int write_msg(struct cdap * instance,
+ cdap_t * msg)
+{
+ buffer_t buf;
+ int ret;
+
+ buf.len = cdap__get_packed_size(msg);
+ if (buf.len == 0)
+ return -1;
+
+ buf.data = malloc(BUF_SIZE);
+ if (buf.data == NULL)
+ return -1;
+
+ cdap__pack(msg, buf.data);
+
+ ret = flow_write(instance->fd, buf.data, buf.len);
+
+ free(buf.data);
+
+ return ret;
+}
+
+static int buffer_to_cdap_msg(cdap_t * msg,
+ buffer_t * val,
+ size_t len)
+{
+ int i;
+
+ msg->value = malloc(len * sizeof(*msg->value));
+ if (msg->value == NULL)
+ return -1;
+
+ msg->n_value = len;
+ for (i = 0; i < len; i++) {
+ if (val[i].data == NULL) {
+ free(msg->value);
+ return -1;
+ }
+
+ msg->value[i].data = val[i].data;
+ msg->value[i].len = val[i].len;
+ }
+
+ return 0;
+}
+
+static int send_read_or_start_or_stop(struct cdap * instance,
+ char * name,
+ opcode_t code)
+{
+ int id;
+ cdap_t msg = CDAP__INIT;
+
+ if (instance == NULL || name == NULL)
+ return -1;
+
+ id = next_invoke_id(instance);
+ if (!bmp_is_id_valid(instance->ids, id))
+ return -1;
+
+ msg.opcode = code;
+ msg.invoke_id = id;
+ msg.name = name;
+
+ return write_msg(instance, &msg);
+}
+
+static int send_create_or_delete(struct cdap * instance,
+ char * name,
+ buffer_t val,
+ opcode_t code)
+{
+ int id;
+ cdap_t msg = CDAP__INIT;
+ int ret;
+
+ if (instance == NULL || name == NULL)
+ return -1;
+
+ id = next_invoke_id(instance);
+ if (!bmp_is_id_valid(instance->ids, id))
+ return -1;
+
+ msg.opcode = code;
+ msg.name = name;
+ msg.invoke_id = id;
+
+ if (buffer_to_cdap_msg(&msg, &val, 1)) {
+ release_invoke_id(instance, id);
+ return -1;
+ }
+
+ ret = write_msg(instance, &msg);
+
+ free(msg.value);
+
+ return ret;
+}
+
+int cdap_send_read(struct cdap * instance,
+ char * name)
+{
+ return send_read_or_start_or_stop(instance, name, OPCODE__READ);
+}
+
+int cdap_send_write(struct cdap * instance,
+ char * name,
+ buffer_t * val,
+ size_t len,
+ uint32_t flags)
+{
+ int id;
+ int ret;
+ cdap_t msg = CDAP__INIT;
+
+ if (instance == NULL || name == NULL ||
+ val == NULL || len < 1)
+ return -1;
+
+ id = next_invoke_id(instance);
+ if (!bmp_is_id_valid(instance->ids, id))
+ return -1;
+
+ msg.opcode = OPCODE__WRITE;
+ msg.name = name;
+ msg.has_flags = true;
+ msg.flags = flags;
+ msg.invoke_id = id;
+
+ if (buffer_to_cdap_msg(&msg, val, len)) {
+ release_invoke_id(instance, id);
+ return -1;
+ }
+
+ ret = write_msg(instance, &msg);
+
+ free(msg.value);
+
+ return ret;
+}
+
+int cdap_send_create(struct cdap * instance,
+ char * name,
+ buffer_t val)
+{
+ return send_create_or_delete(instance, name, val, OPCODE__CREATE);
+}
+
+int cdap_send_delete(struct cdap * instance,
+ char * name,
+ buffer_t val)
+{
+ return send_create_or_delete(instance, name, val, OPCODE__DELETE);
+}
+
+int cdap_send_start(struct cdap * instance,
+ char * name)
+{
+ return send_read_or_start_or_stop(instance, name, OPCODE__START);
+}
+
+int cdap_send_stop(struct cdap * instance,
+ char * name)
+{
+ return send_read_or_start_or_stop(instance, name, OPCODE__STOP);
+}
+
+int cdap_send_reply(struct cdap * instance,
+ int invoke_id,
+ int result,
+ buffer_t * val,
+ size_t len)
+{
+ cdap_t msg = CDAP__INIT;
+
+ if (instance == NULL || val == NULL)
+ return -1;
+
+ msg.invoke_id = invoke_id;
+ msg.has_result = true;
+ msg.result = result;
+
+ if (buffer_to_cdap_msg(&msg, val, len))
+ return -1;
+
+ return write_msg(instance, &msg);
+}
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