jschoubben
8f5b786a6b
Tasks 3.1 and 3.3 of novox/hq ADR 0116. One fixture directory, read by every implementation's own runner rather than copied into each — a fixture copied twice is two fixtures, and two fixtures drift. The README settles what ADR 0074's byte-for-byte can and cannot mean. The envelope is exact: the subject, the required headers, each name and format, because those are what two implementations get wrong invisibly. The body is not: it is the module's payload, and Go sorts a map's keys where JavaScript keeps insertion order, so demanding identical bytes would commit every implementation to a canonical JSON encoder to buy a property the mesh never uses. Said plainly, because read strictly it would have sent somebody writing one.
45 lines
1.6 KiB
JSON
45 lines
1.6 KiB
JSON
{
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"capability": "events",
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"name": "a module emits an event",
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"why": "The envelope is what two implementations can disagree about without either failing: a missing header, a header spelled differently, or a body nested where metadata belongs. None of those stop a mesh running; they stop it reacting.",
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"given": {
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"module": "shop",
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"node": "one",
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"key": "order.placed",
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"body": { "id": "a1", "total": 12 },
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"headers": {
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"x-event-id": "0123456789abcdef0123456789abcdef",
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"x-source": "shop",
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"x-node": "one",
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"x-time": "2026-09-26T12:00:00Z",
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"content-type": "application/json"
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}
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},
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"wire": {
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"subject": "mesh.mod.shop.event.order.placed",
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"requiredHeaders": ["x-event-id", "x-source", "x-node", "x-time", "content-type"],
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"optionalHeaders": ["x-causation-id", "x-schema"],
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"headerFormats": {
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"x-time": "RFC3339",
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"content-type": "application/json",
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"x-event-id": "^[0-9a-f]{32}$"
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},
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"payloadIs": "the body alone, not the envelope",
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"keyRecoveredFrom": "the subject, after the .event. token"
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},
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"refuses": [
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{
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"what": "an envelope nested in the payload",
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"why": "an implementation that publishes the whole envelope as the body passes all of its own tests and is unreadable to every other"
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},
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{
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"what": "a missing x-event-id",
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"why": "delivery is at-least-once and only the emitter can say which of two messages is a redelivery"
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},
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{
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"what": "an x-source that differs from the subject's module",
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"why": "the bus enforces the namespace, so a disagreement means the envelope is lying about its origin"
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}
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]
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}
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