Running example(s)

This is a runnable example at: https://ide.c9.io/agocorona/transienttest

It is a distributed program with N nodes that is accessed with a web interface made of widgets using the transient stack. It show three different distributed applications: A map-reduce widget which count the words in a text, a federated chat server and a node monitor which display the nodes connected.

The source code of the example (less than 200 lines of code including browser interface!):

https://github.com/agocorona/transient-universe/blob/master/examples/distributedApps.hs

transientt

transientt2

It is necessary to sign in in Cloud9. Then, clone this project.

In the console, execute three nodes with init.sh:

agocorona:~/workspace $ cd transientinstaller
agocorona:~/workspace/transientinstaller (master) $ cat init.sh 
./distributedApps  -p start/localhost/8080 &
./distributedApps  -p start/localhost/8081/add/localhost/8080/y &
./distributedApps  -p start/localhost/8082/add/localhost/8080/y & 

agocorona:~/workspace/transientinstaller (master) $ ./init.sh

Executing: "start/localhost/8081/add/localhost/8080/y"
Executing: "start/localhost/8080"
Executing: "start/localhost/8082/add/localhost/8080/y"
.. more messages ...
Known nodes: 
[("localhost",8082,[]),("localhost",8080,[]),("localhost",8081,[])]

A cluster of three nodes will be started.

agocorona:~/workspace/transientinstaller (master) $ ps
PID TTY          TIME CMD
1081 pts/1    00:00:00 bash
1082 pts/1    00:00:00 bash
2927 pts/1    00:00:37 distributedApps
2928 pts/1    00:00:00 distributedApps
2929 pts/1    00:00:00 distributedApps
3132 pts/1    00:00:00 ps

Connect with the first node at port 8080 by pointing the browser to:

http://transienttest-youruser.c9users.io/

to enter in the second node: http://transienttest-youruser.c9users.io:8081

to enter in the third node: @http://transienttest-youruser.c9users.io:8082

All widgets execute in the cluster. This means that chat messages are propagated to all the nodes and you can chat across browsers connected to any of the nodes. and map-reduce requests initiated in one of the nodes are executed in the three nodes.

Warning: This example is at the limit of the capacity of the free cloud9 instance. Please do not send big queries to map-reduce. this will shut down the conections and will be no response. kill the processes and restart them again with init.hs

if you want to compile it:

  > stack install ghcjs-hplay  --compiler ghcjs-0.2.0.9006020_ghc-7.10.3
  > stack install ghcjs-hplay
  > mkdir static
  > ghcjs -o static/out distributedApps.hs
  > ghc distributedApps.hs

to run nodes, use init.hs as example. It run three nodes and connect them:

> cat init.hs
./distributedApps  -p start/localhost/8080 &
./distributedApps  -p start/localhost/8081/add/localhost/8080/y &
./distributedApps  -p start/localhost/8082/add/localhost/8080/y &

There are ephimeral instances running now at: http://transienttest-agocorona.c9users.io for 24h aprox from this notice to play with them if you don't want to clone and run your own.