hhhhh v1.0.1

weather-Server

1.add configs/db.json and configs/local.json

2.execute following commands.

  cd scripts
  sudo bash installation.sh

or to add data from mysql instance execute following.

  cd scripts 
  sudo bash addDataOnMysql.sh <mysql_user> <mysql_host> <mysql_password>

3.start background with command

  ENV=BACKGROUND node background.js

4.start the weather server with command.

  node background.js

Code flow.

1.Background.js

• 1.set() will call the scan function.
• 2.scan will return array of all the cityids stored in redis.
• 3.all the cityids are sorted and depending on the no. of server running and the serverNo a subarray of cityids will be update.
• eq. if 5 servers are running and this is 4th servers and no fo cityids are 100. then this server will update the cityid from index 60 to 79. -4.In this subarray for each cityid openweather request will be made and data will be stored in redis.

2.migration.sh

• 1.download the cassandra-data depending on the filename.
• 2.file is processed and ips.json file is created with.
• 3.migrationScript.js is run for populating the data.

3.migrationScript.js

• 1.ips from ips.json files are converted to ipNumbers and sorted.
• 2.out off this sorted list subarray of 500 ips are used to call getIpData which will get the
• city for this ip from mysql and will store the ip to city mapping in redis and cityIds array is created and on callback next 500 ips will be called.

• 3.for each cityid in array, openweather is called which will store the city data in redis.

  4.ipLookup.js

• 1.first ip to cityid mapping is checked in redis for the ip.

• 2.if cityid is found then getCityData is called.
• 3.if cityid is not present then getIpData is called
• 4.getIpData will check the ip to cityid mapping in mysql,will store the data in redis and getCityData is called.
• 5.getCityData will check the cityData in redis.
• 6.if data is found then data is formated and response is send.
• 7.if data is not present then openWeather is called with id.
• 8.openWeather will make the request to openweather server depending on the cityid and responseData is stored in redis.

• 9.after getting the data from openweather data is formated and response is send.