Add project skeleton

Change-Id: Ieae59a0c66c9a9f7500f56e33cc0a98d572c0621
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

4 files changed, 510 insertions, 0 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
new file mode 100644
index 0000000..4707070
--- /dev/null
+++ b/src/CMakeLists.txt
@@ -0,0 +1,42 @@
+###########################################################################
+# Copyright 2015, 2016, 2017 IoT.bzh
+#
+# author: Fulup Ar Foll <fulup@iot.bzh>
+# contrib: Romain Forlot <romain.forlot@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.
+###########################################################################
+
+# Add target to project dependency list
+PROJECT_TARGET_ADD(harvester)
+
+	# Define project Targets
+	add_library(${TARGET_NAME} MODULE
+		${TARGET_NAME}.c
+	)
+
+	set(OPENAPI_DEF "harvester-apidef" CACHE STRING "name and path to the JSON API definition without extension")
+
+	# Binder exposes a unique public entry point
+	SET_TARGET_PROPERTIES(${TARGET_NAME} PROPERTIES
+		PREFIX "afb-"
+		LABELS "BINDINGV2"
+		LINK_FLAGS ${BINDINGS_LINK_FLAG}
+		OUTPUT_NAME ${TARGET_NAME}
+	)
+
+	# Library dependencies (include updates automatically)
+	TARGET_LINK_LIBRARIES(${TARGET_NAME}
+		afb-helpers
+		${link_libraries})
+
diff --git a/src/harvester-apidef.json b/src/harvester-apidef.json
new file mode 100644
index 0000000..3ae3dee
--- /dev/null
+++ b/src/harvester-apidef.json
@@ -0,0 +1,193 @@
+{
+  "openapi": "3.0.0",
+  "$schema": "http://iot.bzh/download/openapi/schema-3.0/default-schema.json",
+  "info": {
+    "description": "",
+    "title": "harvester",
+    "version": "4.0",
+    "x-binding-c-generator": {
+      "api": "harvester",
+      "version": 2,
+      "prefix": "",
+      "postfix": "",
+      "start": null ,
+      "onevent": null,
+      "init": "init",
+      "scope": "",
+      "private": false
+    }
+  },
+  "servers": [
+    {
+      "url": "ws://{host}:{port}/api/monitor",
+      "description": "TS caching binding",
+      "variables": {
+        "host": {
+          "default": "localhost"
+        },
+        "port": {
+          "default": "1234"
+        }
+      },
+      "x-afb-events": [
+        {
+          "$ref": "#/components/schemas/afb-event"
+        }
+      ]
+    }
+  ],
+  "components": {
+    "schemas": {
+      "afb-reply": {
+        "$ref": "#/components/schemas/afb-reply-v2"
+      },
+      "afb-event": {
+        "$ref": "#/components/schemas/afb-event-v2"
+      },
+      "afb-reply-v2": {
+        "title": "Generic response.",
+        "type": "object",
+        "required": [ "jtype", "request" ],
+        "properties": {
+          "jtype": {
+            "type": "string",
+            "const": "afb-reply"
+          },
+          "request": {
+            "type": "object",
+            "required": [ "status" ],
+            "properties": {
+              "status": { "type": "string" },
+              "info": { "type": "string" },
+              "token": { "type": "string" },
+              "uuid": { "type": "string" },
+              "reqid": { "type": "string" }
+            }
+          },
+          "response": { "type": "object" }
+        }
+      },
+      "afb-event-v2": {
+        "type": "object",
+        "required": [ "jtype", "event" ],
+        "properties": {
+          "jtype": {
+            "type": "string",
+            "const": "afb-event"
+          },
+          "event": { "type": "string" },
+          "data": { "type": "object" }
+        }
+      }
+    },
+    "x-permissions": {
+        "monitor": {
+          "permission": "urn:AGL:permission:low-can:public:monitor"
+        },
+        "write": {
+          "permission": "urn:AGL:permission::platform:can:write "
+        }
+    },
+    "responses": {
+            "200": {
+              "description": "A complex object array response",
+              "content": {
+                "application/json": {
+                  "schema": {
+                    "$ref": "#/components/schemas/afb-reply"
+                  }
+                }
+            }
+          }
+    }
+  },
+  "paths": {
+    "/auth": {
+      "description": "Authenticate session to raise Level Of Assurance of the session",
+      "get": {
+        "x-permissions": {
+          "$ref": "#/components/x-permissions/write"
+        },
+        "responses": {
+          "200": {"$ref": "#/components/responses/200"}
+        }
+      }
+    },
+    "/write": {
+      "description": "Write a metric to local TSDB and Cloud service if available",
+      "get": {
+        "x-permissions": {
+          "LOA": 1
+        },
+        "parameters": [
+          {
+            "in": "query",
+            "name": "host",
+            "required": false,
+            "schema": { "type": "string" }
+          },
+          {
+            "in": "query",
+            "name": "port",
+            "required": false,
+            "schema": { "type": "integer" }
+          },
+          {
+            "in": "query",
+            "name": "metric",
+            "required": true,
+            "schema": { "type": "object" },
+            "parameters" : [
+              {
+                "in": "query",
+                "name": "name",
+                "required": true,
+                "schema": { "type": "string" }
+              },
+              {
+                "in": "query",
+                "name": "source",
+                "required": false,
+                "schema": { "type": "string" }
+              },
+              {
+                "in": "query",
+                "name": "unit",
+                "required": false,
+                "schema": { "type": "string" }
+              },
+              {
+                "in": "query",
+                "name": "identity",
+                "required": false,
+                "schema": { "type": "string" }
+              },
+              {
+                "in": "query",
+                "name": "value",
+                "required": true,
+                "schema": {
+                  "oneOf": [
+                    {"type": "boolean"},
+                    {"type": "integer"},
+                    {"type": "double"},
+                    {"type": "string"}
+                  ]
+                }
+              },
+              {
+                "in": "query",
+                "name": "timestamp",
+                "required": true,
+                "schema": { "type": "double" }
+              }
+            ]
+          }
+        ],
+        "responses": {
+          "200": {"$ref": "#/components/responses/200"}
+        }
+      }
+    }
+  }
+}
diff --git a/src/harvester.c b/src/harvester.c
new file mode 100644
index 0000000..2120676
--- /dev/null
+++ b/src/harvester.c
@@ -0,0 +1,241 @@
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@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 "harvester.h"
+#include "harvester-apidef.h"
+#include <string.h>
+#include <stdio.h>
+
+#include "curl-wrap.h"
+#include "wrap-json.h"
+
+#define DEFAULT_DB "agl-collector"
+#define DEFAULT_DBHOST "localhost"
+#define DEFAULT_DBPORT "8086"
+#define URL_MAXIMUM_LENGTH 2047
+
+int dbping()
+{
+	int ret = 0;
+	char *result;
+	size_t result_size;
+	CURL *request = curl_wrap_prepare_get("localhost:"DEFAULT_DBPORT"/ping",NULL, NULL);
+	curl_wrap_perform(request, &result, &result_size);
+
+	if(curl_wrap_response_code_get(request) != 204) {
+		AFB_ERROR("TimeSeries DB not reachable");
+		ret = -1;
+	}
+
+	curl_easy_cleanup(request);
+	return ret;
+}
+
+int create_database()
+{
+	int ret = 0;
+	char *result;
+	size_t result_size;
+
+	// Declare query to be posted
+	const char **post_data;
+	post_data = malloc(sizeof(*post_data));
+	post_data[0] = "q=CREATE DATABASE \""DEFAULT_DB"\"";
+	post_data[1] = NULL;
+
+	CURL *request = curl_wrap_prepare_post("localhost:"DEFAULT_DBPORT"/query",NULL, 1, post_data);
+	curl_wrap_perform(request, &result, &result_size);
+
+	if(curl_wrap_response_code_get(request) != 200) {
+		AFB_ERROR("Can't create database.");
+		ret = -1;
+	}
+
+	curl_easy_cleanup(request);
+	free(post_data);
+
+	if(ret == 0)
+		AFB_NOTICE("Database 'agl-collector' created");
+
+	return ret;
+}
+
+void curl_cb(void *closure, int status, CURL *curl, const char *result, size_t size)
+{
+	struct afb_req *req = (struct afb_req*)closure;
+	long rep_code = curl_wrap_response_code_get(curl);
+	switch(rep_code) {
+		case 204:
+			AFB_DEBUG("Request correctly written");
+			afb_req_success(*req, NULL, "Request has been successfully writen");
+			break;
+		case 400:
+			afb_req_fail(*req, "Bad request", result);
+			break;
+		case 401:
+			afb_req_fail(*req, "Unauthorized access", result);
+			break;
+		case 404:
+			afb_req_fail(*req, "Not found", result);
+			AFB_NOTICE("Attempt to create the DB '"DEFAULT_DB"'");
+			create_database();
+			break;
+		case 500:
+			afb_req_fail_f(*req, "Timeout", "Overloaded server: %s", result);
+			break;
+		default:
+			afb_req_fail(*req, "Failure", "Unexpected behavior.");
+			break;
+	}
+}
+
+int unpack_metric(json_object *m, const char **name, const char **source, const char **unit, const char **identity, json_object **jv, uint64_t *timestamp)
+{
+	if (wrap_json_unpack(m, "{ss,s?s,s?s,s?s,so,sI!}",
+					"name", name,
+					"source", source,
+					"unit", unit,
+					"identity", identity,
+					"value", jv,
+					"timestamp", timestamp))
+		return -1;
+	else if (!json_object_is_type(*jv, json_type_boolean) &&
+			 !json_object_is_type(*jv, json_type_double) &&
+			 !json_object_is_type(*jv, json_type_int) &&
+			 !json_object_is_type(*jv, json_type_string))
+		return -1;
+
+	return 0;
+}
+
+void concatenate(char* dest, const char* source, const char *sep)
+{
+	strncat(dest, sep, strlen(sep));
+	strncat(dest, source, strlen(source));
+}
+
+char *make_query(char *query, const char *name, const char *source, const char *unit, const char *identity, json_object *jv, uint64_t timestamp)
+{
+	char *ts;
+	memset(query, 0, URL_MAXIMUM_LENGTH);
+
+	strncat(query, name, strlen(name));
+	if (source) {
+		concatenate(query, source, ",");
+	}
+	if (unit) {
+		concatenate(query, unit, ",");
+	}
+	if (identity) {
+		concatenate(query, identity, ",");
+	}
+
+	concatenate(query, "value", " ");
+	concatenate(query, json_object_to_json_string(jv), "=");
+	asprintf(&ts, "%lu", timestamp);
+	concatenate(query, ts, " ");
+
+	return query;
+}
+
+CURL *make_curl_write_post(const char *url, struct json_object *metric)
+{
+	CURL *curl;
+	const char *name = NULL,
+			*source = NULL,
+			*unit = NULL,
+			*identity = NULL,
+			**post_data;
+	char query[URL_MAXIMUM_LENGTH];
+	memset(query, 0, URL_MAXIMUM_LENGTH);
+
+	post_data = malloc(sizeof(*post_data));
+
+	json_object *jv = NULL;
+	uint64_t timestamp = 0;
+
+	if(unpack_metric(metric, &name, &source, &unit, &identity, &jv, &timestamp)) {
+		AFB_ERROR("ERROR UNPACKING metric. %s", json_object_to_json_string(metric));
+		curl = NULL;
+	}
+	else {
+		make_query(query, name, source, unit, identity, jv, timestamp);
+		post_data[0] = query;
+		post_data[1] = NULL;
+		curl = curl_wrap_prepare_post(url, NULL, 1, post_data);
+	}
+
+	free(post_data);
+	return curl;
+}
+
+int do_write(struct afb_req req, const char* host, int port, json_object *metric)
+{
+	CURL *curl_request;
+	char url[URL_MAXIMUM_LENGTH]; // Safe limit for most popular web browser
+	memset(url, 0, sizeof(url));
+
+	// Handle default host and port
+	host = host ? host : DEFAULT_DBHOST;
+	port = port > 0 ? port : atoi(DEFAULT_DBPORT);
+
+	strncat(url, host, strlen(host));
+	strncat(url, ":"DEFAULT_DBPORT"/write?db="DEFAULT_DB, strlen(":"DEFAULT_DBPORT"/write?db="DEFAULT_DB));
+	curl_request = make_curl_write_post(url, metric);
+	curl_wrap_do(curl_request, curl_cb, &req);
+
+	return 0;
+}
+
+void write(struct afb_req req)
+{
+	int port = -1;
+	const char *host = NULL;
+
+	json_object *req_args = afb_req_json(req),
+				*metric = NULL;
+
+	if(wrap_json_unpack(req_args, "{s?s,s?i,so!}",
+								"host", &host,
+								"port", &port,
+								"metric", &metric) || ! metric)
+		afb_req_fail(req, "Failed", "Error processing arguments. Miss metric\
+		JSON object or malformed");
+	else if(do_write(req, host, port, metric))
+		afb_req_fail(req, "Failed", "Error processing metric JSON object.\
+		Malformed !");
+}
+
+void auth(struct afb_req request)
+{
+	afb_req_session_set_LOA(request, 1);
+	afb_req_success(request, NULL, NULL);
+}
+
+int init()
+{
+	int err = 0;
+	err = curl_global_init(CURL_GLOBAL_DEFAULT);
+	if (!err)
+		err = dbping();
+	else {
+		AFB_ERROR("Something went wrong initiliazing libcurl. Abort");
+	}
+
+	return err;
+}
diff --git a/src/harvester.h b/src/harvester.h
new file mode 100644
index 0000000..e67145c
--- /dev/null
+++ b/src/harvester.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@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 AFB_BINDING_VERSION 2
+#include <afb/afb-binding.h>
+
+union port {
+	int i_port;
+	char c_port[5]; // Available ports 1-65535
+};
+
+union metric_value {
+	enum metric_type {b = 0, i, d, str} type;
+	int b_value;
+	int i_value;
+	double d_value;
+	char *str_value;
+};
+
+int init();