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Simplifying systems with Elixir - Belgrade
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Saša Jurić
October 25, 2018
Programming
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400
Simplifying systems with Elixir - Belgrade
Saša Jurić
October 25, 2018
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Transcript
Simplifying systems with Elixir @sasajuric aircloak.com
Elixir functional concurrent
process ... foo(...) bar(...) ...
functional Elixir modules and functions immutable data first-class functions
... spawn(fn -> ... end) ...
process A ... foo(...) bar(...) ... process B ... baz(...)
qux(...) ...
send( process_b, some_message ) receive do message -> handle(message) end
process a process b
BEAM (Erlang VM)
BEAM (Erlang VM)
scheduler scheduler scheduler scheduler BEAM (Erlang VM) CPU CPU CPU
CPU
concurrent functional
activities incoming requests background jobs in-memory state load control …
managing activities multiple OS processes 3rd party products service managers
None
None
uniformity simpler development simpler testing simpler deployment simpler maintenance improved
collaboration
None
theerlangelist.com
git clone https://github.com/sasa1977/erlangelist.git mix deps.get && pushd assets && npm
install && popd iex -S mix phx.server
None
serving requests
http listener https listener
http listener https listener handler 1 handler 2 handler n
…
usage stats
stats collector handler handler handler
stats collector disk writer
def store(path, data) do File.write!( path, :erlang.term_to_binary(data) ) end
def read(path, default) do path |> File.read!() |> :erlang.binary_to_term() rescue
ArgumentError -> default end
cleanup
scheduler cleanup job periodically starts
HTTPS
our system CA server certificate request challenge info challenge
certifier http server usage stats
dev CA server
service management
defmodule StatsCollector do def start_link() do # ... end #
... end
Supervisor.start_link( [ StatsCollector, Cleanup ], # .. )
supervisor stats collector cleanup
supervisor worker
1
1 2
1 2 3 4 5
1 2 6 9 7 8 3 4 5
erlangelist usage stats web
usage stats stats collector cleanup
web ACME server main site certifier
None
technical feature built-in options services GenServer, Task service manager Supervisor
service registry Registry k-v ets, mnesia web server phoenix, plug, cowboy periodical jobs :timer, quantum, periodic load regulation jobs, safetyvalve, sbroker concurrent flows Flow, GenStage
Elixir in a nutshell start simple go far
Elixir guides Phoenix guides Learning resources Elixir forum
40% off using code ctwelixirbg18 at manning.com slides available at
bit.ly/elixirbg102018