Installation

1. Git clone
2. cd EchoApi
3. node index.js [port_num] (default is 3000)

There are 3 part

1. HTTP listener the listens to the POST requests: http://localhost:3000/echoApi/echo

Example Body: { "time" : "1576441444287", "message" : "678" }

Get the message and inserts it to the Sorted set while the weight is the timestamp - giving us a set sorted by timesamp. I am saving it as a Json with the message+ timestamp + uuid just to make sure it is completely uniq.

2. Worker that

• Runs every second (configurable)
• Performs locking
• Gets all the messages in the sorted set which their weight is smaller than the current time
• Writes them into a message list
• Deletes them from the sorted set
• releases the lock

This way even if there are multiple servers only one worker can get from the sorted set at a time (I have verified)

3. echoer - listens on the messages list with a blockig pull blpop and print the message to the console