[Bug] Geo Report can throw an error on saving

[roma-glushko]

There can be an issue during Geo report generation.

Preconditions

• The latest version of Tango
• Any OS (reproduced on macOS)

Steps to reproduce

• Run the latest version of Tango like this:

tango geo -l 2019-10-13-transfer.log -r 10-13-geo-report.csv

Expected result

Geo report is generated in any case and saved correctly to the file system.

Actual results

There is an error in the console:

💃 Tango is on the scene!
💃 started to generate a geo report...
💃 reading access logs...
 433.17 MiB / 433.97 MiB [============================================================]  99.81% 1m7s
💃 saving the geo report...
2019/10/14 12:03:05 ipAddress passed to Lookup cannot be nil

No reports are saved.

[roma-glushko]

As it turned out, it's possible to get non-IP values in IP list part of log entry. For example:

servername.com
servername.com:80
servername.com:443

Usually, this happens when someone tries to scan a website on vulnerabilities and crafting extraordinary requests.

PR: #24

[roma-glushko]

Fixed in https://github.com/roma-glushko/tango/releases/tag/1.0.3-rc4