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netns: add comment about undesirable algorithmic complexity

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We don't want to be Accidentally Quadratic™
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Erik Arvstedt 2020-08-21 22:35:57 +02:00
parent a3ae8668e6
commit 0f0f6ddbb9
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1 changed files with 6 additions and 0 deletions
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6
modules/netns-isolation.nix
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@ -16,6 +16,12 @@ let
# availableNetns.bitcoind = [ "clighting" ]; # availableNetns.bitcoind = [ "clighting" ];
# and # and
# availableNetns.clighting = [ "bitcoind" ]; # availableNetns.clighting = [ "bitcoind" ];
#
# FIXME: Although negligible for our purposes, this calculation's runtime
# is in the order of (number of connections * number of services),
# because attrsets and lists are fully copied on each update with '//' or '++'.
# This can only be improved with an update in the nix language.
#
availableNetns = let availableNetns = let
# base = { clightning = [ "bitcoind" ]; ... } # base = { clightning = [ "bitcoind" ]; ... }
base = builtins.mapAttrs (n: v: base = builtins.mapAttrs (n: v: