Flow IDs on log lines

Some flows seem to not be getting matched up with their UUIDS.

So make sure to print flow IDs on the log lines in an effort to discover what flows have this problem.

Reduce queuing

Lots of changes to reduce queuing of packets in RAM. Also turned off promiscuous mode.

Save to .pcap.gz instead of .pcap

Save to .pcap.gz instead of .pcap (#24)

Release buffer memory after write

Allow garbage to be garbage. (#23)

Initial load testing revealed extreme RAM usage. This change attempts to release buffer memory early.

Fix logs, memory usage, header size

Fix logs, memory usage, header size (#21)

Log successes as well as failures
Don't buffer packets in channels. Instead, buffer packet headers in in-memory files.
Fix header size calculation.

Add context to Open & Close methods (#22)

Fix logs, memory usage, header size

Fix logs, memory usage, header size (#21)

• Log successes as well as failures
• Don't buffer packets in channels. Instead, buffer packet headers in in-memory files.
• Fix header size calculation.

Packet headers now truncated more correctly

The previous release over-truncated packet headers. This release should preserve TCP headers and not just IP headers.

First deployment

• Some internal renaming and code cleanup occurred. #11
• We now capture packets on all specified interfaces (or just all interfaces) #12
• Files are now saved in RAM and written to disk all at once. #7
• There is now a SIGTERM signal handler to allow graceful exit. #15

The first version!

Packet headers are now captured by this daemon. It is fully unit-tested, but it is not yet proven in practice. Also, it is quite likely that it needs new monitoring metrics set up to make better SLIs.

That said: It works and it is now ready for trial deployment!