SDLE Project for group T1G16.

Group members:

1. André Gomes ([email protected])
2. Daniel Silva ([email protected])
3. Luís Marques ([email protected])
4. Rodrigo Reis ([email protected])

1. Install miniconda or anaconda via the following link: https://docs.conda.io/projects/conda/en/latest/user-guide/install/index.html
2. clone this repository
3. In the root of this project, create a conda environment from the environment.yml file:

conda env create -f environment.yml

4. Activate the environment

conda activate sdle_p1

1. Initiate the Proxy

python3 src/proxy.py

2. Initiate Nodes

python3 src/node.py <Node_ID> [dev]

• If the dev flag is activated, the user will be granted a iterative prompt to send messages. PLease follow the requested syntax carefully, in this mode, topics and messages submitted can not have more than one word (if necessary, use _ to separate words)
• if the dev flag is not activated, the node will run steps according to its source code, the steps are in the following format:

if identity == '<Node_ID_1>'
  <Steps>
elif identity == '<Node_ID_2>'
  <Steps>

A Step could be any of the following:

time.sleep(<seconds>)
sub(socket, [<Topic>])
unsub(socket, [<Topic>])
get(socket, [<Topic>])
put(socket, [<Topic>, <Message>])

This way, it is possible to have Topics and Messages with multiple words

No relatório como na demonstração deverão focar-se nas garantias de fiabilidade do serviço. Na demonstração deverão demonstrar a durabilidade das subscrições e a tolerância a falhas relativamente simples, p.ex. "crash" do servidor ou dum subscritor. Cenários de falhas mais complexos, p. ex. que envolvam mensagens de "acknowledgement", deverão ser discutidos no relatório.

Use the flag dev to test anything using the nodes

• Delete proxy.pickle file and run server
• Run any number of nodes with diferent ID's using python3 src/node.py <Node_ID> dev

• Sub -> Put -> Get -> Unsub
• Sub -> Get -> Put -> Unsub
• SUB -> Put -> Put -> Get -> Get -> Unsub

A sub subscribes and waits for messages to be put in the topic. A publisher puts some messages in the topic and exits. The subscriber gets 1 of the messages and exits. The proxy can be restarted and the state is mantained.

Server-side:

• Delete proxy.pickle file and run server
• Run node as SUB1 dev and run node as PUB1 dev
• Sub -> Put -> ProxyCrash -> ProxyUp -> Get

client-side:

• Delete proxy.pickle file and run server
• Run node as SUB1 dev and run node as PUB1 dev
• Sub -> Put -> SubCrash -> SubUp -> Get

• Delete proxy.pickle file and run server
• Run node as SUB1 dev and run node as PUB1 dev
• Sub -> Get -> SubCrash -> SubUp -> Put -> Get
• Sub -> Get -> SubCrash -> Put -> SubUp -> Get

• conda activate sdle_p1 - to activate the environment
• conda env export --from-history > environment.yml - to export environment to a configuration file
• conda env create -f environment.yml - to create an environment from a configuration file
• conda install --name sdle_p1 package-name - to install packages