ets-backed mongoose_router

[NelsonVides]

The beginning of the idea comes from https://www.erlang.org/doc/efficiency_guide/tablesdatabases:

For non-persistent database storage, prefer Ets tables over Mnesia local_content tables. Even the Mnesia dirty_write operations carry a fixed overhead compared to Ets writes. Mnesia must check if the table is replicated or has indices, this involves at least one Ets lookup for each dirty_write. Thus, Ets writes is always faster than Mnesia writes.

With that text in mind, I realised that the routing table in MIM is currently implemented as a mnesia local_content table. So I decided to make it an ets table. Which was a good opportunity to turn it into mongooseim code. Now we have our own nicely optimised router backend for the most common local routing. Components and s2s remain unchanged, to be optimised some other time.

[codecov]

Codecov Report

Merging #3505 (4e9d66f) into master (a5e9d8e) will increase coverage by 0.01%.
The diff coverage is 84.84%.

@@            Coverage Diff             @@
##           master    #3505      +/-   ##
==========================================
+ Coverage   80.96%   80.97%   +0.01%     
==========================================
  Files         418      419       +1     
  Lines       32329    32309      -20     
==========================================
- Hits        26174    26163      -11     
+ Misses       6155     6146       -9     

Impacted Files	Coverage Δ
src/config/mongoose_config_spec.erl	99.20% <ø> (ø)
src/ejabberd_s2s_in.erl	76.56% <50.00%> (-0.55%)	⬇️
src/ejabberd_router.erl	76.00% <80.00%> (+4.48%)	⬆️
src/mongoose_router.erl	87.50% <87.50%> (ø)
src/domain/mongoose_lazy_routing.erl	84.84% <100.00%> (ø)
src/ejabberd_app.erl	94.73% <100.00%> (+0.07%)	⬆️
src/ejabberd_local.erl	77.34% <100.00%> (ø)
src/mongoose_router_localdomain.erl	100.00% <100.00%> (ø)
...stem_metrics/mongoose_system_metrics_collector.erl	93.81% <100.00%> (ø)
src/logger/mongoose_log_filter.erl	78.08% <0.00%> (-1.37%)	⬇️
... and 8 more

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[arcusfelis]

small comments

[arcusfelis]

added comments

[mongoose-im]

small_tests_24 / small_tests / 4e9d66f
Reports root / small

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small_tests_23 / small_tests / 4e9d66f
Reports root / small

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dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / 4e9d66f
Reports root/ big
OK: 2691 / Failed: 0 / User-skipped: 238 / Auto-skipped: 0

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dynamic_domains_pgsql_mnesia_23 / pgsql_mnesia / 4e9d66f
Reports root/ big
OK: 2691 / Failed: 0 / User-skipped: 238 / Auto-skipped: 0

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dynamic_domains_mysql_redis_24 / mysql_redis / 4e9d66f
Reports root/ big
OK: 2674 / Failed: 0 / User-skipped: 255 / Auto-skipped: 0

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dynamic_domains_mssql_mnesia_24 / odbc_mssql_mnesia / 4e9d66f
Reports root/ big
OK: 2691 / Failed: 0 / User-skipped: 238 / Auto-skipped: 0

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ldap_mnesia_23 / ldap_mnesia / 4e9d66f
Reports root/ big
OK: 1500 / Failed: 0 / User-skipped: 390 / Auto-skipped: 0

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ldap_mnesia_24 / ldap_mnesia / 4e9d66f
Reports root/ big
OK: 1500 / Failed: 0 / User-skipped: 390 / Auto-skipped: 0

---

internal_mnesia_24 / internal_mnesia / 4e9d66f
Reports root/ big
OK: 1541 / Failed: 0 / User-skipped: 349 / Auto-skipped: 0

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pgsql_mnesia_24 / pgsql_mnesia / 4e9d66f
Reports root/ big
OK: 3078 / Failed: 0 / User-skipped: 247 / Auto-skipped: 0

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elasticsearch_and_cassandra_24 / elasticsearch_and_cassandra_mnesia / 4e9d66f
Reports root/ big
OK: 1834 / Failed: 0 / User-skipped: 363 / Auto-skipped: 0

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mysql_redis_24 / mysql_redis / 4e9d66f
Reports root/ big
OK: 3073 / Failed: 0 / User-skipped: 252 / Auto-skipped: 0

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mssql_mnesia_24 / odbc_mssql_mnesia / 4e9d66f
Reports root/ big
OK: 3078 / Failed: 0 / User-skipped: 247 / Auto-skipped: 0

---

pgsql_mnesia_23 / pgsql_mnesia / 4e9d66f
Reports root/ big
OK: 3078 / Failed: 0 / User-skipped: 247 / Auto-skipped: 0

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riak_mnesia_24 / riak_mnesia / 4e9d66f
Reports root/ big
OK: 1680 / Failed: 0 / User-skipped: 363 / Auto-skipped: 0