created weather.js in node.js examples, modified README.md (#394)

examples/nodejs/README.md

@@ -82,7 +82,7 @@ This is a basic example of how you can easily use asynchronous requests in your
 $ fission function create --name stock --env nodejs --code stock.js
 
 # Map GET /stock to your new function
-$ fission route create --method GET --url /stock --function stock
+$ fission route create --method POST --url /stock --function stock
 
 # Run the function.
 $ curl -H "Content-Type: application/json" -X POST -d '{"symbol":"AAPL"}' http://$FISSION_ROUTER/stock
@@ -103,3 +103,22 @@ $ fission fn create --name kubeEventsSlack --env nodejs --code kubeEventsSlack.j
 # Watch all services in the default namespace:
 $ fission watch create --function kubeEventsSlack --type service --ns default
 ```
+
+## weather.js
+
+In this example, the Yahoo Weather API is used to current weather at a given location.
+
+### Usage
+
+```bash
+# Upload your function code to fission
+$ fission function create --name weather --env nodejs --code weather.js
+
+# Map GET /stock to your new function
+$ fission route create --method POST --url /weather --function weather
+
+# Run the function.
+$ curl -H "Content-Type: application/json" -X POST -d '{"location":"Sieteiglesias, Spain"}' http://$FISSION_ROUTER/weather
+
+{"text":"It is 2 celsius degrees in Sieteiglesias, Spain and Mostly Clear"}
+```

examples/nodejs/weather.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const rp = require('request-promise-native');
+
+module.exports = async function (context) {
+    const stringBody = JSON.stringify(context.request.body);
+    const body = JSON.parse(stringBody);
+    const location = body.location;
+
+    if (!location) {
+        return {
+            status: 400,
+            body: {
+                text: 'You must provide a location.'
+            }
+        };
+    }
+
+    try {
+        const response = await rp(`https://query.yahooapis.com/v1/public/yql?q=select item.condition from weather.forecast where woeid in (select woeid from geo.places(1) where text="${location}") and u="c"&format=json`);
+        const condition = JSON.parse(response).query.results.channel.item.condition;
+        const text = condition.text;
+        const temperature = condition.temp;
+        return {
+            status: 200,
+            body: {
+                text: `It is ${temperature} celsius degrees in ${location} and ${text}`
+            },
+            headers: {
+                'Content-Type': 'application/json'
+            }
+        };
+    } catch (e) {
+        console.error(e);
+        return {
+            status: 500,
+            body: e
+        };
+    }
+}