jschoubben
41f7c51032
The other half of ADR 0038, and what 04-ISSUES/028 was actually about. A module can now avoid colliding with another module; until this it could not avoid colliding with the mesh itself. The substrate is not a module. A node raises it from the bundle it carries before any mesh exists, so the control plane had never heard of the store, the broker, or its own container — and handed a database module 5432, which the store already had. So the machine says. The host records what each resource binds, distinguishing what it carried from what the mesh sent — a distinction that already existed so the two never remove each other — and reports the carried ones. The node states and this context writes, which is the shape of every message between them. What the declaration binds, not what is open. A machine's open ports are a moving target, and assigning around them would mean a port that was free when it was asked for and taken when it was used. Replaced whole each time rather than merged: a machine that gave a port back must be believed about that too, and a set that only grows keeps a port reserved for something no longer there. Tested against a real database, and the tests bite — removing the check hands the module 20000, which the machine had said it holds.
13 lines
728 B
SQL
13 lines
728 B
SQL
-- Ports a machine holds that the mesh did not assign.
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--
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-- novox/hq ADR 0038. The substrate is not a module: a node raises it from the bundle it carries
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-- before any mesh exists, so the control plane has never heard of the store or the broker. Told
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-- what they hold, it can put a module somewhere else; not told, it hands out a port one of them
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-- has and finds out from a container runtime three layers down.
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--
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-- On the node rather than in the assignment table, because these are not assignments -- nothing
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-- here chose them, and nothing here can move them. They are a fact about the machine, replaced
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-- whole each time the machine states it.
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alter table node add column carried_ports integer[] not null default '{}';
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