replaced store binding with a database binding based on a berkeley db

Change-Id: I03978ecbf996ebc6d53a88dfd2b275051080016f
Signed-off-by: Loïc Collignon <loic.collignon@iot.bzh>

1 files changed, 389 insertions, 0 deletions

diff --git a/ll-database-binding/src/ll-database-binding.c b/ll-database-binding/src/ll-database-binding.c
new file mode 100644
index 0000000..adaf023
--- /dev/null
+++ b/ll-database-binding/src/ll-database-binding.c
@@ -0,0 +1,389 @@
+/*
+ * Copyright 2017 IoT.bzh
+ *
+ * author: Loïc Collignon <loic.collignon@iot.bzh>
+ *
+ * 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.
+ */
+
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/types.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <string.h>
+#include <linux/limits.h>
+#include <json-c/json.h>
+#include <db.h>
+
+#define AFB_BINDING_VERSION 2
+#include <afb/afb-binding.h>
+
+#include "utils.h"
+
+#define DBFILE		"/ll-database-binding.db"
+#define USERNAME	"agl"
+#define APPNAME		"firefox"
+
+// ----- Globals -----
+DB*		database;
+char*	database_file;
+
+// ----- Binding's declarations -----
+int ll_database_binding_init();
+void verb_read(struct afb_req req);
+void verb_update(struct afb_req req);
+void verb_delete(struct afb_req req);
+
+void verb_insert(struct afb_req req);
+void verb_update(struct afb_req req);
+void verb_delete(struct afb_req req);
+void verb_read(struct afb_req req);
+
+// ----- Binding's implementations -----
+
+/**
+ * @brief Initialize the binding.
+ * @return Exit code, zero if success.
+ */
+int ll_database_binding_init()
+{
+	struct passwd pwd;
+	struct passwd* result;
+	char* buf;
+	size_t bufsize;
+	int ret;
+	
+	bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
+	if (bufsize == -1) bufsize = 16384;
+	buf = malloc(bufsize);
+	if (buf == NULL)
+	{
+		AFB_ERROR("Allocation failed!");
+		return 1;
+	}
+	
+	ret = getpwuid_r(getuid(), &pwd, buf, bufsize, &result);
+	if (result == NULL)
+	{
+		free(buf);
+		if (ret == 0) AFB_ERROR("User not found");
+		else AFB_ERROR("getpwuid_r failed with %d code", ret);
+		return 1;
+	}
+	
+	bufsize = strlen(result->pw_dir) + strlen(DBFILE) + 1;
+	database_file = malloc(bufsize);
+	if (database_file == NULL)
+	{
+		free(buf);
+		AFB_ERROR("Allocation failed!");
+		return 1;
+	}
+	
+	memset(database_file, 0, bufsize);	
+	strcat(database_file, result->pw_dir);
+	strcat(database_file, DBFILE);
+	free(buf);
+	
+	AFB_INFO("The database file is '%s'", database_file);
+
+	if ((ret = db_create(&database, NULL, 0)) != 0)
+	{
+		AFB_ERROR("Failed to create database: %s.", db_strerror(ret));
+		free(database_file);
+		return 1;
+	}
+	
+	if ((ret = database->open(database, NULL, database_file, NULL, DB_BTREE, DB_CREATE, 0664)) != 0)
+	{
+		AFB_ERROR("Failed to open the '%s' database: %s.", database_file, db_strerror(ret));
+		database->close(database, 0);
+		free(database_file);
+		return 1;
+	}
+	
+	return 0;
+}
+
+/**
+ * @brief Handle the @c read verb.
+ * @param[in] req The query.
+ */
+void verb_insert(struct afb_req req)
+{
+	DBT key;
+	DBT data;
+	int ret;
+	
+	char* rkey;
+	const char* tag;
+	const char* value;
+	
+	struct json_object* args;
+	struct json_object* item;
+	
+	args = afb_req_json(req);
+	
+	if (!args)
+	{
+		afb_req_fail(req, "No argument provided.", NULL);
+		return;
+	}
+	
+	if (!json_object_object_get_ex(args, "key", &item) || !item) tag = NULL;
+	else tag = json_object_get_string(item);
+	
+	if (!tag || !strlen(tag))
+	{
+		afb_req_fail(req, "No tag provided.", NULL);
+		return;
+	}
+	
+	if (!json_object_object_get_ex(args, "value", &item) || !item) value = NULL;
+	else value = json_object_get_string(item);
+	
+	if (!value || !strlen(value))
+	{
+		afb_req_fail(req, "No value provided.", NULL);
+		return;
+	}
+	
+	rkey = malloc(strlen(USERNAME) + strlen(APPNAME) + strlen(tag) + 3);
+	strcpy(rkey, USERNAME);
+	strcat(rkey, ":");
+	strcat(rkey, APPNAME);
+	strcat(rkey, ":");
+	strcat(rkey, tag);
+	
+	AFB_INFO("insert: key=%s, value=%s", rkey, value);
+
+	memset(&key, 0, sizeof(key));
+	memset(&data, 0, sizeof(data));
+	
+	key.data = rkey;
+	key.size = strlen(rkey);
+	
+	data.data = (void*)value;
+	data.size = strlen(value);
+
+	if ((ret = database->put(database, NULL, &key, &data, DB_NOOVERWRITE)) == 0)
+		afb_req_success_f(req, NULL, "db success: insertion %s=%s.", (char*)key.data, (char*)data.data);
+	else
+		afb_req_fail_f(req, "Failed to insert datas.", "db fail: insertion : %s=%s - %s", (char*)key.data, (char*)data.data, db_strerror(ret));
+	free(rkey);
+}
+
+void verb_update(struct afb_req req)
+{
+	DBT key;
+	DBT data;
+	int ret;
+	
+	char* rkey;
+	const char* tag;
+	const char* value;
+	
+	struct json_object* args;
+	struct json_object* item;
+	
+	args = afb_req_json(req);
+	// username should be get from identity binding
+	// application should be get from smack
+	// tag should be get using get_json_string(args, "tag");
+	
+	if (!args)
+	{
+		afb_req_fail(req, "No argument provided.", NULL);
+		return;
+	}
+	
+	if (!json_object_object_get_ex(args, "tag", &item) || !item) tag = NULL;
+	else tag = json_object_get_string(item);
+	
+	if (!tag || !strlen(tag))
+	{
+		afb_req_fail(req, "No tag provided.", NULL);
+		return;
+	}
+	
+	if (!json_object_object_get_ex(args, "value", &item) || !item) value = NULL;
+	else value = json_object_get_string(item);
+	
+	if (!value || !strlen(value))
+	{
+		afb_req_fail(req, "No value provided.", NULL);
+		return;
+	}
+	
+	rkey = malloc(strlen(USERNAME) + strlen(APPNAME) + strlen(tag) + 3);
+	strcpy(rkey, USERNAME);
+	strcat(rkey, ":");
+	strcat(rkey, APPNAME);
+	strcat(rkey, ":");
+	strcat(rkey, tag);
+	
+	AFB_INFO("update: key=%s, value=%s", rkey, value);
+
+	memset(&key, 0, sizeof(key));
+	memset(&data, 0, sizeof(data));
+	
+	key.data = rkey;
+	key.size = strlen(rkey);
+	
+	data.data = (void*)value;
+	data.size = strlen(value);
+
+	if ((ret = database->put(database, NULL, &key, &data, 0)) == 0)
+		afb_req_success_f(req, NULL, "db success: update %s=%s.", (char*)key.data, (char*)data.data);
+	else
+		afb_req_fail_f(req, "Failed to update datas.", "db fail: update %s=%s - %s", (char*)key.data, (char*)data.data, db_strerror(ret));
+	free(rkey);
+}
+
+void verb_delete(struct afb_req req)
+{
+	DBT key;
+	int ret;
+	
+	char* rkey;
+	const char* tag;
+	
+	struct json_object* args;
+	struct json_object* item;
+	
+	args = afb_req_json(req);
+	
+	if (!args)
+	{
+		afb_req_fail(req, "No argument provided.", NULL);
+		return;
+	}
+	
+	if (!json_object_object_get_ex(args, "tag", &item) || !item) tag = NULL;
+	else tag = json_object_get_string(item);
+	
+	if (!tag || !strlen(tag))
+	{
+		afb_req_fail(req, "No tag provided.", NULL);
+		return;
+	}
+	
+	rkey = malloc(strlen(USERNAME) + strlen(APPNAME) + strlen(tag) + 3);
+	strcpy(rkey, USERNAME);
+	strcat(rkey, ":");
+	strcat(rkey, APPNAME);
+	strcat(rkey, ":");
+	strcat(rkey, tag);
+	
+	AFB_INFO("delete: key=%s", rkey);
+
+	memset(&key, 0, sizeof(key));
+	
+	key.data = rkey;
+	key.size = strlen(rkey);
+
+	if ((ret = database->del(database, NULL, &key, 0)) == 0)
+		afb_req_success_f(req, NULL, "db success: delete %s.", (char *)key.data);
+	else
+		afb_req_fail_f(req, "Failed to delete datas.", "db fail: delete %s - %s", (char*)key.data, db_strerror(ret));
+	free(rkey);
+}
+
+void verb_read(struct afb_req req)
+{
+	DB* dbp;
+	DBT key;
+	DBT data;
+	int ret;
+	
+	char* rkey;
+	const char* tag;
+	char value[4096];
+	
+	struct json_object* args;
+	struct json_object* item;
+	struct json_object* result;
+	struct json_object* val;
+	
+	args = afb_req_json(req);
+	
+	if (!args)
+	{
+		afb_req_fail(req, "No argument provided.", NULL);
+		return;
+	}
+	
+	if (!json_object_object_get_ex(args, "tag", &item) || !item) tag = NULL;
+	else tag = json_object_get_string(item);
+	
+	if (!tag || !strlen(tag))
+	{
+		afb_req_fail(req, "No tag provided.", NULL);
+		return;
+	}
+	
+	rkey = malloc(strlen(USERNAME) + strlen(APPNAME) + strlen(tag) + 3);
+	strcpy(rkey, USERNAME);
+	strcat(rkey, ":");
+	strcat(rkey, APPNAME);
+	strcat(rkey, ":");
+	strcat(rkey, tag);
+	
+	AFB_INFO("update: key=%s, value=%s", rkey, value);
+
+	memset(&key, 0, sizeof(key));
+	memset(&data, 0, sizeof(data));
+	memset(&value, 0, 4096);
+	
+	key.data = rkey;
+	key.size = strlen(rkey);
+	
+	data.data = value;
+	data.ulen = 4096;
+	data.flags = DB_DBT_USERMEM;
+
+	if ((ret = database->get(database, NULL, &key, &data, 0)) == 0)
+	{
+		result = json_object_new_object();
+		val = json_tokener_parse((char*)data.data);
+		json_object_object_add(result, "value", val ? val : json_object_new_string((char*)data.data));
+		
+		afb_req_success_f(req, result, "db success: read %s=%s.", (char*)key.data, (char*)data.data);
+	}
+	else
+		afb_req_fail_f(req, "Failed to read datas.", "db fail: read %s - %s", (char*)key.data, db_strerror(ret));
+	free(rkey);
+}
+
+// ----- Binding's configuration -----
+static const struct afb_auth ll_database_binding_auths[] = {
+};
+
+static const afb_verb_v2 ll_database_binding_verbs[]= {
+		REGISTER_VERB(insert,	NULL, NULL, AFB_SESSION_NONE_V2),
+		REGISTER_VERB(update,	NULL, NULL, AFB_SESSION_NONE_V2),
+		REGISTER_VERB(delete,	NULL, NULL, AFB_SESSION_NONE_V2),
+		REGISTER_VERB(read,		NULL, NULL, AFB_SESSION_NONE_V2),
+        { .verb = NULL}
+};
+
+const struct afb_binding_v2 afbBindingV2 = {
+                .api = "ll-database",
+                .specification = NULL,
+                .verbs = ll_database_binding_verbs,
+                .preinit = NULL,
+                .init = ll_database_binding_init,
+                .onevent = NULL,
+                .noconcurrency = 0
+};