diff --git a/http-bridge/.env-sample b/http-bridge/.env-sample new file mode 100644 index 0000000000000000000000000000000000000000..03c23bcf1619c05685601965c191a29d52bfc17d --- /dev/null +++ b/http-bridge/.env-sample @@ -0,0 +1,6 @@ +# Http Bridge Host (DONT CHANGE if running with Docker) +HOST="0.0.0.0" +# Http Bridge Port +PORT=9010 +# Base URL of the API +API_URL= diff --git a/http-bridge/.gitignore b/http-bridge/.gitignore new file mode 100644 index 0000000000000000000000000000000000000000..713d5006dabfe2792c6ee1dbb4fdbdff2c44e304 --- /dev/null +++ b/http-bridge/.gitignore @@ -0,0 +1,2 @@ +node_modules/ +.env diff --git a/http-bridge/Dockerfile b/http-bridge/Dockerfile new file mode 100644 index 0000000000000000000000000000000000000000..a028bc08f277d9fce31a1a59d901f8b646d8ca99 --- /dev/null +++ b/http-bridge/Dockerfile @@ -0,0 +1,20 @@ +FROM node:18 + +WORKDIR /app + +COPY package*.json ./ + +RUN npm install + +COPY . . + +# Set environment variables (if no .env file is provided) +# ENV API_URL=https://smartcity.heraklion.gr/api +# ENV PORT=9010 +# ENV HOST="0.0.0.0" + +# Expose the application's port +EXPOSE 9010 + +# Start the application +CMD ["node", "app.js"] diff --git a/http-bridge/README.md b/http-bridge/README.md new file mode 100644 index 0000000000000000000000000000000000000000..12ce0fa23e436f689dd905a34c5f391287b94506 --- /dev/null +++ b/http-bridge/README.md @@ -0,0 +1,85 @@ +# **HTTP Bridge for NGSI-LD Integration** + +## **Overview** + +The **HTTP Bridge** serves as a middleware between the **Scorpio Broker** and the **Smart City Heraklion API**. It is responsible for **fetching data from the API**, **translating it into the NGSI-LD format**, and **returning a structured response** that conforms to the **NGSI-LD data model**. + +--- + +## **Getting Started** + +### **1. Prerequisites** +Ensure you have the following installed: +- **Docker** +- **Node.js** (v14 or higher, if running locally) +- **npm** (Node Package Manager) +--- + +### **2. Configuration** +Before running the application, configure the necessary environment variables. + +### **Using `.env` File (Recommended)** +Create a `.env` file in the project root with the following content: + +``` +PORT=9010 # Http Bridge Port +HOST="0.0.0.0" # Http Bridge Host (DONT CHANGE id running with Docker) +API_URL=https://smartcity.heraklion.gr/open-data-api # Base URL of the API +``` + +### **3. Running the HTTP Bridge** +1. Install npm packages +``` +npm install +``` + +2. Build the Docker Image +``` +docker build -t http-bridge . +``` + +3. Run the Container + +``` +docker run -d --name http-bridge -p 8080:8080 --env-file .env http-bridge +``` + +The bridge will be accessible at: **{HOST}:{PORT}** + +Default: **http://localhost:8080** + +--- +### **4. Stopping & Removing the Container** + +1. To stop the running container: +``` +docker stop http-bridge +``` + +2. To remove the container: +``` +docker rm http-bridge +``` + +--- + +## **Supported NGSI-LD Entity Types** +| **Entity Type** | **Description** | +|----------------------|--------------------------------------------------------| +| `WeatherObserved` | Real-time weather conditions (temperature, humidity, etc.) | + +Additional entity types can be added dynamically by extending the **Type Mapping Configuration**. + +--- + +## **Extending the Bridge** +To support more NGSI-LD models, simply: +1. **Add a new type mapping** in `typeMaps/` +2. **Extend `NGSITranslator.js`** to handle the new entity type +3. **Modify `generalControllers.js`** to process the new queries + +--- + +## **Extra Links** +[Scorpio Broker](https://github.com/efntallaris/scorpioBroker) +[Postman Workplace](https://www.postman.com/payload-geoscientist-32828968/workspace/scorpio-broker-registration) \ No newline at end of file diff --git a/http-bridge/app.js b/http-bridge/app.js new file mode 100644 index 0000000000000000000000000000000000000000..3898ac46bf8c3d313d3a8c25a06ffa694aeaa141 --- /dev/null +++ b/http-bridge/app.js @@ -0,0 +1,20 @@ +const express = require("express"); +const morgan = require("morgan"); +const temporalRoutes = require("./routes/temporalRoute"); +const realTimeRoutes = require("./routes/realTimeRoute"); + +require("dotenv").config(); + +const PORT = process.env.PORT || 9010; +const HOST = process.env.HOST || "0.0.0.0"; + +const app = express(); +app.use(morgan("dev")); + +app.use("/ngsi-ld/v1/temporal/entities", temporalRoutes); +app.use("/ngsi-ld/v1/entities", realTimeRoutes ); + +// Start the Express server +app.listen(PORT, HOST, () => { + console.log(`HTTP Bridge is running on ${HOST}:${PORT}`); +}); diff --git a/http-bridge/controllers/generalControllers.js b/http-bridge/controllers/generalControllers.js new file mode 100644 index 0000000000000000000000000000000000000000..7398bbd1349b93a73b17721dc9bf21c0ca4c2df1 --- /dev/null +++ b/http-bridge/controllers/generalControllers.js @@ -0,0 +1,186 @@ +const axios = require("axios"); +const NGSITranslator = require("../translator/NGSITranslator"); +const typeMaps = require("../typeMaps/typeMaps"); + +/** + * Generates a modality_id parameter based on the type and attributes provided. + * If attributes are given, it will filter the modalities to only include the ones + * that correspond to the given attributes. Otherwise, it will return all modalities + * available for the given type. + * + * Based on Smart City Heraklion API + * + * @param {string} type The NGSI-LD type to generate the modality_id for + * @param {string} attributes A comma-separated list of attributes to filter by + * @throws {Error} If the type is invalid or no valid attributes are found + * @returns {string} The modality_id parameter as a string + */ +function generateModalityIdParam(type, attributes) { + const modalityMap = typeMaps[type]; + if (!modalityMap) { + throw new Error(`Invalid type: ${type}`); + } + + // Filter attributes if provided, otherwise return all + const modalityIds = attributes + ? attributes.split(",").map(attr => Object.entries(modalityMap) + .find(([_, value]) => value.slug === attr)?.[0]) + .filter(Boolean) + : Object.keys(modalityMap); + + if (modalityIds.length === 0) { + throw new Error(`No valid attributes found for type: ${type}`); + } + + return modalityIds; +} + +/** + * Fetches data from the Smart City Heraklion API and translates it to NGSI-LD. + * + * @param {string} type The NGSI-LD type to retrieve + * @param {string} [attrs] A comma-separated list of attributes to filter by + * @param {Function} fetcher The specific fetcher function to use (fetchWeatherObservedTemporalData or fetchWeatherObservedRealTimeData) + * @param {Object} [additionalParams] Additional parameters to pass to the fetcher function + * @param {Response} res The Express response object + * @throws {Error} If the type is invalid, no valid attributes are found, or the API request fails + */ +const fetchEntities = async (type, attrs, fetcher, additionalParams, res) => { + try { + if (!type) { + return res.status(400).json({ error: "Missing required parameter: type" }); + } + + if (!typeMaps[type]) { + return res.status(400).json({ error: `Unsupported entity type: ${type}` }); + } + + const modalityIdParam = generateModalityIdParam(type, attrs); + if (!modalityIdParam) { + return res.status(400).json({ error: "Missing modality_id parameter." }); + } + + // Call the specific fetcher function + const apiResponse = await fetcher(type, modalityIdParam, additionalParams); + + if (!apiResponse || !apiResponse.data) { + return res.status(500).json({ error: "Failed to retrieve data from API." }); + } + + // Translate response to NGSI-LD + const ngsiData = NGSITranslator.toNGSI(apiResponse.data, type); + res.status(200).json(ngsiData); + } catch (error) { + console.error("Error in fetchEntities:", error.message); + res.status(500).json({ error: error.message || "Failed to fetch entities." }); + } +}; + +/** + * Fetches the temporal data for a given NGSI-LD entity type. + * + * @param {string} type The NGSI-LD type to retrieve + * @param {string} modalityIdParam The modality_id parameter for filtering + * @param {Object} [params] Additional parameters for the API request + * @throws {Error} If the entity type is unsupported + */ +const fetchWeatherObservedTemporalData = async (type, modalityIds, params) => { + if (!Array.isArray(modalityIds) || modalityIds.length === 0) { + throw new Error(`Invalid modality IDs for type: ${type}`); + } + + const results = { data: [] }; + + // Loop through each modality ID and make separate requests + for (const modalityId of modalityIds) { + try { + const apiResponse = await axios.post(`${process.env.API_URL}/rpc/measurements_averages`, { + _devices: "{71,72,73,63,64,36,68,70,61,69,67,66,65,60,59,120}", + _from: params.time, + _to: params.endTime, + _granularity: "1 hour", + _modality: typeMaps[type][modalityId].key, + _show_out_of_range: false + }); + + if (apiResponse && apiResponse.data) { + formattedData = apiResponse.data.map(entry => ({ + device_id: modalityId, + modality_id: parseInt(modalityId, 10), + value: entry.avg, + observed_at: entry.at + })); + + results.data.push(...formattedData); + } + } catch (error) { + console.error(`Error fetching data for modalityId ${modalityId}:`, error.message); + } + } + + return results; +}; + +/** + * Fetches the latest real-time data for a given NGSI-LD entity type. + * + * @param {string} type The NGSI-LD type to retrieve + * @param {string} modalityIdParam The modality_id parameter for filtering + * @throws {Error} If the entity type is unsupported + */ + +const fetchWeatherObservedRealTimeData = async (type, modalityIdParam) => { + switch (type) { + case "WeatherObserved": + return axios.get(`${process.env.API_URL}/latest_measurements_averages`, { + params: { modality_id: `in.(${Array.isArray(modalityIdParam) ? modalityIdParam.join(",") : modalityIdParam})` }, + }); + default: + throw new Error(`Unsupported real-time entity type: ${type}`); + } +}; + + +/** + * Handles incoming requests for temporal NGSI-LD entities. + * + * @prop {string} type The NGSI-LD type to retrieve + * @prop {string} timerel The temporal relationship to apply (e.g. "after", "before") + * @prop {string} time The timestamp to apply the temporal relationship to + * @prop {string} endTime The end time for the time range query + * @prop {string} attrs A comma-separated list of attributes to filter by + */ +const getTemporalEntities = async (req, res) => { + console.log("Incoming temporal request:", req.query); + let { type, timerel, time, endTime, attrs } = req.query; + + // Decode URL-encoded time values (fixes %3A issue) + time = decodeURIComponent(time); + if (endTime) endTime = decodeURIComponent(endTime); + + // Ensure proper ISO 8601 formatting + const now = new Date().toISOString(); + + if (timerel === "after") { + endTime = now; // Set endTime to current time + } else if (timerel === "before") { + endTime = time; // Swap values for "before" + time = new Date(new Date(endTime).setDate(new Date(endTime).getDate() - 30)).toISOString(); // 30 days before + } + + await fetchEntities(type, attrs, fetchWeatherObservedTemporalData, { time, endTime }, res); +}; + +/** + * Handles incoming requests for real-time NGSI-LD entities. + * + * @prop {string} 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0000000000000000000000000000000000000000..cb68f6c55246142b46b75f0895d1e40eb72d96c1 --- /dev/null +++ b/http-bridge/package.json @@ -0,0 +1,18 @@ +{ + "name": "wrappertest", + "version": "1.0.0", + "main": "index.js", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1" + }, + "keywords": [], + "author": "", + "license": "ISC", + "description": "", + "dependencies": { + "axios": "^1.7.8", + "dotenv": "^16.4.5", + "express": "^4.21.1", + "morgan": "^1.10.0" + } +} diff --git a/http-bridge/routes/realTimeRoute.js b/http-bridge/routes/realTimeRoute.js new file mode 100644 index 0000000000000000000000000000000000000000..ed8e6f792e28b75255c3be1e59c53173c50b147c --- /dev/null +++ b/http-bridge/routes/realTimeRoute.js @@ -0,0 +1,8 @@ +const express = require("express"); +const { getRealTimeEntities } = require("../controllers/generalControllers"); + +const router = express.Router(); + +router.get("/", getRealTimeEntities); + +module.exports = router; diff --git a/http-bridge/routes/temporalRoute.js b/http-bridge/routes/temporalRoute.js new file mode 100644 index 0000000000000000000000000000000000000000..e26715a3a3ab6504a0df7398a36461f4a6ff8c19 --- /dev/null +++ b/http-bridge/routes/temporalRoute.js @@ -0,0 +1,8 @@ +const express = require("express"); +const { getTemporalEntities } = require("../controllers/generalControllers"); + +const router = express.Router(); + +router.get("/", getTemporalEntities); + +module.exports = router; diff --git a/http-bridge/translator/NGSITranslator.js b/http-bridge/translator/NGSITranslator.js new file mode 100644 index 0000000000000000000000000000000000000000..316d33391bbde2e059c6b855456e8d0fec685cd9 --- /dev/null +++ b/http-bridge/translator/NGSITranslator.js @@ -0,0 +1,83 @@ +const typeMaps = require("../typeMaps/typeMaps"); + +class NGSITranslator { + static toNGSI(apiData, entityType) { + switch (entityType) { + case "WeatherObserved": + return NGSITranslator.processWeatherObserved(apiData, entityType); + default: + throw new Error(`Unsupported entity type: ${entityType}`); + } + } + + static processWeatherObserved(apiData, entityType) { + const typeMap = typeMaps[entityType]; + if (!typeMap) { + throw new Error(`No mapping found for entity type: ${entityType}`); + } + + const groupedByDevice = {}; + + apiData.forEach(item => { + const { device_id, modality_id, value, observed_at } = item; + + // Ensure the device entry exists + if (!groupedByDevice[device_id]) { + groupedByDevice[device_id] = { + id: `urn:ngsi-ld:Device:${device_id}`, + type: entityType, + dateObserved: { type: "Property", values: [] }, + "@context": [ + "https://raw.githubusercontent.com/smart-data-models/dataModel.Weather/master/context.jsonld", + "https://uri.etsi.org/ngsi-ld/v1/ngsi-ld-core-context.jsonld" + ] + }; + } + + const modalityInfo = typeMap[modality_id]; + if (modalityInfo) { + // Ensure property exists, else initialize + if (!groupedByDevice[device_id][modalityInfo.key]) { + groupedByDevice[device_id][modalityInfo.key] = { + type: "Property", + values: [] + }; + } + + // Append new observation instead of overwriting + groupedByDevice[device_id][modalityInfo.key].values.push( + NGSITranslator.createProperty(value, modalityInfo.unit, modalityInfo.min, modalityInfo.max, modalityInfo.slug, observed_at) + ); + + // Append observed_at to dateObserved (avoid duplicates) + if (!groupedByDevice[device_id].dateObserved.values.includes(observed_at)) { + groupedByDevice[device_id].dateObserved.values.push(observed_at); + } + } + }); + + return Object.values(groupedByDevice); + } + + static createProperty(value, unit, min, max, slug, observedAt = null) { + if (value == null) return undefined; + + return { + type: "Property", + values: [ + { + value: value, + // Extra data (optional) + metadata: { + unitCode: { type: "Property", value: unit }, + healthRange: { type: "Property", value: { min, max } }, + slug: { type: "Property", value: slug } + }, + ...(observedAt ? { observedAt: observedAt } : {}) // Include `observedAt` only if present + } + ] + }; + } +} + +module.exports = NGSITranslator; diff --git a/http-bridge/typeMaps/typeMaps.js b/http-bridge/typeMaps/typeMaps.js new file mode 100644 index 0000000000000000000000000000000000000000..fd75277c6a9189fa2bd1db91d3da6b8c939eeaeb --- /dev/null +++ b/http-bridge/typeMaps/typeMaps.js @@ -0,0 +1,9 @@ +const weatherObservedTypeMap = require("./weatherObservedTypeMaps"); + +// List of all available NGSI-LD model types +const typeMaps = { + "WeatherObserved": weatherObservedTypeMap, + // "WaterQualityObserved": waterQualityObservedTypeMap +}; + +module.exports = typeMaps; \ No newline at end of file diff --git a/http-bridge/typeMaps/weatherObservedTypeMaps.js b/http-bridge/typeMaps/weatherObservedTypeMaps.js new file mode 100644 index 0000000000000000000000000000000000000000..e746d8298a2c07f502b8ae2a29aca55f1630531a --- /dev/null +++ b/http-bridge/typeMaps/weatherObservedTypeMaps.js @@ -0,0 +1,19 @@ +const weatherObservedTypeMap = { + 1: { key: "ambient_light", unit: "LUX", min: 0, max: 12000, slug: "light" }, + 2: { key: "loudness", unit: "DEC", min: 34.6, max: 85, slug: "noise" }, + 3: { key: "rainfall", unit: "MMT", min: 0, max: 8, slug: "rain" }, + 4: { key: "ambient_temperature", unit: "CEL", min: -10, max: 50, slug: "temperature" }, + 5: { key: "voc", unit: "PPB", min: 0, max: 600, slug: "voc" }, + 6: { key: "sulphurDioxide", unit: "PPB", min: 0, max: 7.09, slug: "so2" }, + 7: { key: "ozone", unit: "PPB", min: 0, max: 47.3, slug: "o3" }, + 8: { key: "nitrogenDioxide", unit: "PPB", min: 0, max: 19.7, slug: "no2" }, + 9: { key: "nitrogenOxide", unit: "PPB", min: 0, max: 25000, slug: "no" }, + 10: { key: "dust", unit: "MCG", min: 0, max: 50, slug: "pm10" }, + 11: { key: "ambient_humidity", unit: "P1", min: 0, max: 100, slug: "humidity" }, + 12: { key: "carbonDioxide", unit: "PPM", min: 0, max: 430, slug: "co2" }, + 13: { key: "atmosphericPressure", unit: "HPA", min: 750, max: 1050, slug: "atmospheric-pressure" }, + 14: { key: "windSpeed", unit: "KMT", min: 0, max: 50, slug: "wind-speed" }, + 15: { key: "windDirection", unit: "DEG", min: 0, max: 359.9, slug: "wind-direction" }, +}; + +module.exports = weatherObservedTypeMap; \ No newline at end of file