Add support for request messages by topics

[adambabik]

This change adds querying mailservers by topics. It is only supported in waku subprotocol and using PostgreSQL maislerver implementation.

This is the implementation of Waku Mailserver spec v0.2

[status-github-bot]

Pull Request Checklist

• Have you updated the documentation, if impacted (e.g. docs.status.im)?

[status-im-auto]

Jenkins Builds

Click to see older builds (18)

❔	Commit	#️⃣	Finished (UTC)	Duration	Platform	Result
❌	eb49894	#1	2020-01-17 15:45:00	~40 sec	android	📄log
✔️	eb49894	#1	2020-01-17 15:45:17	~54 sec	linux	📦zip
❌	eb49894	#1	2020-01-17 15:46:07	~1 min	ios	📄log
✔️	e4c1d13	#2	2020-01-19 17:26:41	~46 sec	linux	📦zip
✔️	e4c1d13	#2	2020-01-19 17:29:47	~3 min	ios	📦zip
✔️	e4c1d13	#2	2020-01-19 17:32:52	~7 min	android	📦aar
✔️	a3a3ff7	#3	2020-01-19 19:39:09	~43 sec	linux	📦zip
✔️	a3a3ff7	#3	2020-01-19 19:41:19	~2 min	ios	📦zip
✔️	a3a3ff7	#3	2020-01-19 19:44:07	~5 min	android	📦aar
❌	0d22dcb	#4	2020-01-19 20:21:20	~23 sec	android	📄log
✔️	0d22dcb	#4	2020-01-19 20:21:39	~38 sec	linux	📦zip
✔️	0d22dcb	#4	2020-01-19 20:23:17	~2 min	ios	📦zip
❌	6144adf	#5	2020-01-19 20:44:01	~30 sec	ios	📄log
✔️	6144adf	#5	2020-01-19 20:44:09	~38 sec	linux	📦zip
❌	6144adf	#5	2020-01-19 20:45:08	~1 min	android	📄log
❌	440b67b	#6	2020-01-20 09:18:18	~21 sec	android	📄log
❌	440b67b	#6	2020-01-20 09:18:29	~30 sec	ios	📄log
✔️	440b67b	#6	2020-01-20 09:18:42	~42 sec	linux	📦zip

❔	Commit	#️⃣	Finished (UTC)	Duration	Platform	Result
✔️	7d021f8	#7	2020-01-20 10:05:52	~46 sec	linux	📦zip
✔️	7d021f8	#7	2020-01-20 10:07:59	~2 min	ios	📦zip
✔️	7d021f8	#7	2020-01-20 10:11:23	~6 min	android	📦aar
✔️	1712a9d	#8	2020-01-20 21:24:17	~40 sec	linux	📦zip
✔️	1712a9d	#8	2020-01-20 21:26:01	~2 min	ios	📦zip
✔️	1712a9d	#8	2020-01-20 21:29:25	~5 min	android	📦aar

[oskarth]

Is this PR closing mailserver spec v0.2 (as it currently stands)? Can we make this explicit? https://specs.vac.dev/waku/mailserver.html

[adambabik]

@oskarth yes, it does. One question:

• Do we want to keep it as topic-interest or topics? I guess it does not really matter but I think it would be nice if the implementation align with the field names used in the spec.

[oskarth]

The spec says topic-interest, do you want to change it? We can, but lets make sure it happens in spec repo first. That way @kdeme can also verify.

[kdeme]

I'm ok with the name change. Removes confusion between topic-interest packet and topic-interest parameters.

[adambabik]

Spec changes: vacp2p/rfc#91