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The World is a Network (and We Are Just Nodes)
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Andrea Leopardi
May 11, 2024
Programming
1
220
The World is a Network (and We Are Just Nodes)
Slides for my Gig City Elixir 2024 talk.
Andrea Leopardi
May 11, 2024
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Transcript
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ANDREALEOPARDI.COM @WHATYOUHIDE
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@ITALIANCOMMENTS ITALIANS MAD AT FOOD
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NETWORK PROGRAMMING
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BANANA 1 BANANA 2 A = TRUE YO, A IS
TRUE GOTCHA
BANANA 1 BANANA 2 A = TRUE YO, A IS
TRUE GOTCHA X
PERSON 1 PERSON 2 A = TRUE YO, A IS
TRUE GOTCHA X
PROCESS 1 PERSON 2 A = TRUE YO, A IS
TRUE GOTCHA X
PROCESS 1 PERSON 2 A = TRUE YO, A IS
TRUE GOTCHA X
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CLIENT SERVER
DISTSYS 101
CABLES WAVES
BEAM
MSG1 MSG2
MSG1 MSG2
NODE NODE
NODE NODE
MSG ACK
ref = make_ref() send(dest_pid, {ref, self(), msg}) receive do {^ref,
response} -> # ... end receive do {ref, sender_pid, msg} -> response = act_on_message(msg) send(sender_pid, {ref, response}) end
ref = make_ref() send(dest_pid, {ref, self(), msg}) receive do {^ref,
response} -> # ... after 1000 -> :timeout end receive do {ref, sender_pid, msg} -> response = act_on_message(msg) send(sender_pid, {ref, response}) end
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:gen_tcp.send(socket, "Hello world") {:ok, data} = :gen_tcp.recv(socket, 0, _timeout =
1000) {:ok, data} = :gen_tcp.recv(socket, 0) response = process_request(data) :gen_tcp.send(socket, response)
:gen_tcp.send(socket, "Hello world") receive do {:tcp, ^socket, response} -> #
... after 1000 -> :timeout end receive do {:tcp, socket, data} -> response = process_request(data) :gen_tcp.send(socket, response) end
GENSERVER.CALL/3
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SERVERS
CLIENT CLIENT
REACTIVE
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SUPERVISORS
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CLIENTS
GEN_STATEM
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IT'S ABOUT THE GUARANTEES
RESTARTING A PROCESS IS ABOUT BRINGING IT BACK TO A
STABLE, KNOWN STATE. FROM THERE, THINGS CAN BE RETRIED. WHEN THE INITIALIZATION ISN'T STABLE, SUPERVISION IS WORTH VERY LITTLE.
LET IT CRASH™? ...NO
PATTERN MATCHING BINARIES
<<message_id::binary-size(2), qr::1, opcode::4, flag_aa::1, flag_tc::1, flag_rd::1, flag_ra::1, _reserved::3, rcode::4, qd_count::16,
an_count::16, ns_count::16, ar_count::16, answer::binary>> = dns_packet
WHY IS THE BEAM SUCH A GREAT FIT?
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- ERLANG BLOG POST ABOUT MESSAGE PASSING - MY BLOG
POST ON TCP CONNECTIONS IN ELIXIR - MY BLOG POST ON GEN_STATEM CONNECTIONS - "IT'S ALL ABOUT THE GUARANTEES" BY FRED HEBERT - THOUSAND ISLANDS ELIXIR LIBRARY - END-TO-END ARGUMENTS IN SYSTEM DESIGN PAPER - BINARY PATTERN MATCHING REFERENCE
@WHATYOUHIDE THANK YOU!