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0

I've encountered with a task described below and have no idea how to solve it.

(I know it's generally a no-no to ask a question without any code or own attempts but I have no clue even to googling. My answer is not about "give me a solution", it's about "advice me what to look at" and "how to get it right".)

Okay, the task:

1. I have a python CLI script for getting some data from the net.


2. When the script runs the first time it should start a subprocess, which will be running (in idle) even when the main script will be end.


3. The subprocess manages network connections and caches, the main script only starts the subprocess and then asks all what it needs from the subprocess.


4. The subsequent main script runs do not start a subprocess — they use the already running one.


5. If subprocess don't get the any requests from main script for some time it should shut down itself.


6. The subsequent main script runs will have to start a subprocess again.

I know I can use the subprocess module in the main script to start a background process and communicate with it.
But how to check whether subprocess is already running and connect to it?
How to detect that a subprocess is unused for a long time to shut down it?

Usually I prefer a relatively low-level means — more my own code, but simpler building blocks.

If my task is fairly hard to solve this way and there is a powerful high-level library for that — I would be glad to know about it too.

Thank you.

python process

share|improve this question

asked Mar 24 at 15:06

shau-koteshau-kote

5171620

add a comment | 

0

I've encountered with a task described below and have no idea how to solve it.

(I know it's generally a no-no to ask a question without any code or own attempts but I have no clue even to googling. My answer is not about "give me a solution", it's about "advice me what to look at" and "how to get it right".)

Okay, the task:

1. I have a python CLI script for getting some data from the net.


2. When the script runs the first time it should start a subprocess, which will be running (in idle) even when the main script will be end.


3. The subprocess manages network connections and caches, the main script only starts the subprocess and then asks all what it needs from the subprocess.


4. The subsequent main script runs do not start a subprocess — they use the already running one.


5. If subprocess don't get the any requests from main script for some time it should shut down itself.


6. The subsequent main script runs will have to start a subprocess again.

I know I can use the subprocess module in the main script to start a background process and communicate with it.
But how to check whether subprocess is already running and connect to it?
How to detect that a subprocess is unused for a long time to shut down it?

Usually I prefer a relatively low-level means — more my own code, but simpler building blocks.

If my task is fairly hard to solve this way and there is a powerful high-level library for that — I would be glad to know about it too.

Thank you.

python process

share|improve this question

asked Mar 24 at 15:06

shau-koteshau-kote

5171620

add a comment | 

I've encountered with a task described below and have no idea how to solve it.

(I know it's generally a no-no to ask a question without any code or own attempts but I have no clue even to googling. My answer is not about "give me a solution", it's about "advice me what to look at" and "how to get it right".)

Okay, the task:

1. I have a python CLI script for getting some data from the net.


2. When the script runs the first time it should start a subprocess, which will be running (in idle) even when the main script will be end.


3. The subprocess manages network connections and caches, the main script only starts the subprocess and then asks all what it needs from the subprocess.


4. The subsequent main script runs do not start a subprocess — they use the already running one.


5. If subprocess don't get the any requests from main script for some time it should shut down itself.


6. The subsequent main script runs will have to start a subprocess again.

I know I can use the subprocess module in the main script to start a background process and communicate with it.
But how to check whether subprocess is already running and connect to it?
How to detect that a subprocess is unused for a long time to shut down it?

Usually I prefer a relatively low-level means — more my own code, but simpler building blocks.

If my task is fairly hard to solve this way and there is a powerful high-level library for that — I would be glad to know about it too.

Thank you.

python process

share|improve this question

asked Mar 24 at 15:06

shau-koteshau-kote

5171620

share|improve this question

asked Mar 24 at 15:06

shau-koteshau-kote

5171620

share|improve this question

asked Mar 24 at 15:06

shau-koteshau-kote

5171620

asked Mar 24 at 15:06

shau-koteshau-kote

5171620

asked Mar 24 at 15:06

shau-koteshau-kote

5171620