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feat(stack): a declaration names what its service answers; a squatter reads as occupied - #51
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…tter reads as occupied A TCP connect only says that something accepts on the port. On a developer machine a next-server on :3000 made the declared Mercure hub read as up (greenhouse evidence/1035). A ServiceDeclaration may now carry a ServiceSignature — one GET path and the statuses the service answers it with — and StackReader asks it through a SignatureProbe: up when the answer matches, the new state occupied (with the status it answered) when the port accepts but answers otherwise. Declarations without a signature read by TCP as before. HttpSignatureProbe reads the status line only, so a service whose right answer is a stream does not hold the reader. Greenhouse decisions/0504, evidence/1037.
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A TCP connect only says that something accepts on a port. On a developer machine an unrelated
next-serveron :3000 madecoa stackreport the declared Mercure hub asup(greenhouse evidence/1035).ServiceDeclarationmay carry aServiceSignature: one GET path and the statuses the service answers it with (a set, because the answer can depend on configuration — a Mercure hub answers a topic-less subscription with 400 when anonymous subscribers are allowed, 401 when a JWT is required).StackReaderasks it through aSignatureProbewhen the port accepts: a match isup; anything else is the new stateoccupied, with the status in the new row keyanswered. Declarations without a signature read by TCP exactly as before.HttpSignatureProbereads the status line only (a service whose right answer is a stream does not hold the reader); no HTTP within 0.5 s isnull, never an exception.Measured on cattle (greenhouse evidence/1037): published 0.16.0 reads the next-server as
up; this branch reads itoccupied(answered 404), and reads real hubs (dunglas/mercurewith/withoutanonymous, FrankenPHP 1.12.7's built-in hub) asup. Mutation controls in the suite. Additive;milpa/adminandmilpa/agent-workspacePRs require it (>=0.17).Greenhouse decisions/0504, evidence/1037.