jschoubben
5173f2a31c
A want that names a node in kept-on, for an artifact its parts name, is fetched through kept-artifact of that node's build seat and read as an object on the bus, checked against the digest; with no kept-on it is fetched from the store, and the builder's builds are read no more (the apply hook, the fetch and the object read from bc8fbc7, its node and fingerprint from the want). Builds: design 47 G §271, §526, §421 (A-50) Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
30 lines
1.4 KiB
Go
30 lines
1.4 KiB
Go
package apply
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import "context"
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// The build the artifact store's holder keeps on a build node (novox/hq design 47, *The artifact store's holder takes its
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// own new build even when its seat is the one broken*): the holder's program cannot be fetched from the store it serves, so
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// its done build names the node that keeps it and the node-engine fetches it from there, through the build seat's verb.
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// How is the caller's (a hook on the apply's context, as the files' link is); what apply does is use the bytes in place of
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// the source's fetch, check them against the declared digest as every fetch is, and gate the module when they cannot be had.
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// KeptFetch gives the bytes of the artifact a module's done build kept on a build node, by the artifact's digest
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// ("sha256:" and 64 hex digits, as a declaration names it). kept is false when the module's build kept no such artifact:
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// the artifact is then fetched from its source, as before. An error says the artifact is kept and could not be had.
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type KeptFetch func(ctx context.Context, module, digest string) (body []byte, kept bool, err error)
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type keptFetchKey struct{}
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// WithKept is ctx carrying how a kept artifact is fetched.
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func WithKept(ctx context.Context, f KeptFetch) context.Context {
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if f == nil {
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return ctx
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}
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return context.WithValue(ctx, keptFetchKey{}, f)
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}
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func keptFetchFrom(ctx context.Context) KeptFetch {
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f, _ := ctx.Value(keptFetchKey{}).(KeptFetch)
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return f
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}
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