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- The server starts a script that calls /util/queue and instantly returns to the web user (or the API user). It starts the shell script and does not wait for a response before returning.
- The user then continues on using the web/API as per normal.
- The shell script calls util/queue - this endpoint only accepts requests from localhost. The resulting function does the following:
- Check the config for the queue limit. If this has been reached, exit. If it has not been reached, continue.
- Pop an item from the queue (locking the queue table as it does so). The item is read from the database, then deleted. If no queue items exist, exit.
- Spawn another script to request util/queue.
- Execute the item - which on the first time is always "run discovery on subnet".
- When finished, return to #1.
There are (currently) two types of queue entries. The overall discovery entry, and an entry for each IP to be scanned. The second entry is created by the first. So we run the initial discovery, and for each IP we need to scan (that responds, if that option is chosen), we create another entry to scan that device.
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