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evangelostsak
6391761c05
A swarm deploy runs either over the mesh or straight over the underlay, and both have to keep working: the mesh joins physically separated clusters, so a single-site swarm has no use for it and must not depend on it. Quarters on sweep // 4 so it flips in step with neither the mode rotation nor the onion, and a row walks every mode/tor/vpn combination over eight sweeps.
48 lines
1.7 KiB
Python
48 lines
1.7 KiB
Python
"""The WireGuard-mesh axis of a deploy row.
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Split out beside ``tor.py`` for the same reason: one axis, its modes, its
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rotation and its glyph pairing belong together rather than spread through the
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assigner.
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A swarm deploy runs either over the mesh or straight over the underlay, and
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both have to keep working -- the mesh joins physically separated clusters, so a
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single-site swarm has no use for it and must not depend on it. Rotating the
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axis proves both arms instead of proving one and assuming the other.
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"""
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from __future__ import annotations
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VPN_DEPLOY_MODES = ("swarm",)
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"""Modes the mesh is meaningful in. Compose is a single host, so there is
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nothing to tunnel between and the axis is always off there."""
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MESH_GLYPH_MODES = VPN_DEPLOY_MODES
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"""Modes whose label carries a mesh glyph at all. A compose title stays as it
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was, so the existing job names do not all churn for an axis they never take."""
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def vpn_states(mode: str) -> list[bool]:
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"""The mesh states *mode* is worth running for a priority row."""
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return [False, True] if mode in VPN_DEPLOY_MODES else [False]
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def wants_vpn(position: int, sweep: int) -> bool:
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"""Whether a swarm row carries the mesh this sweep.
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Quartered on ``sweep // 4`` so it flips in step with neither the mode
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rotation nor the onion: a row walks every mode/tor/vpn combination over
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eight sweeps instead of re-proving the same pairing.
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"""
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return (position + sweep // 4) % 2 == 0
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def rotated_vpn(
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mode: str, *, position: int, sweep: int, pin: bool | None = None
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) -> bool:
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"""The single mesh state a regular row takes this sweep."""
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if mode not in VPN_DEPLOY_MODES:
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return False
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if pin is not None:
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return pin
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return wants_vpn(position, sweep)
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