jschoubben
ba8b8f28a3
A whole state read key by key took the provisioner's composition of one node past 30 s and the assigner's compare past its call bound (ADR 0580 clause 1): each state is now one watch's current values, kept by its changes; a build is read by key and a manifest once per digest. Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL
71 lines
2.4 KiB
Go
71 lines
2.4 KiB
Go
// Package fromruntime is compose/frombus's StatesReader over a bundle's runtime (the lead, 2026-10-29): the states a
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// module's manifest names in `reads` (frombus.StatesReads), read through stdio.State, and a templates archive fetched
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// over HTTP. Apart from frombus so that frombus stays pure for the mesh-compose command.
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package fromruntime
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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stdio "git.novox.be/novox/mesh-sdk/go"
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"git.novox.be/novox/mesh-sdk/go/compose/frombus"
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)
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// States are a bundle's read states through its runtime.
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type States struct{}
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// Get is a key's value, false when it has none.
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func (States) Get(state, key string) ([]byte, bool, error) {
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e, err := stdio.State(state).Get(key)
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if err != nil || e == nil {
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return nil, false, err
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}
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return e.Value, true, nil
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}
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// Keys are a state's keys.
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func (States) Keys(state string) ([]string, error) { return stdio.State(state).Keys() }
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// Reader is frombus's Reader over this bundle's read states key by key, fetching archives over HTTP. A holder that
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// composes again and again reads through Watched instead (novox/hq ADR 0580).
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func Reader() frombus.Reader { return frombus.StatesReader(States{}, HTTPFetch) }
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// Watched is frombus's States over a watched copy (novox/hq ADR 0580 clause 1): the states a composition reads whole
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// (placement, haves, modules, resolved values) from the copy, a build by key when asked, a manifest once per digest.
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type Watched struct{ *stdio.WatchedStates }
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// Get is a key's value: a build read now, a manifest kept once read, any other state's from the copy.
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func (w Watched) Get(state, key string) ([]byte, bool, error) {
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switch state {
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case frombus.BuildsRead:
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return w.Direct(state, key)
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case frombus.ManifestsRead:
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return w.Once(state, key)
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}
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return w.WatchedStates.Get(state, key)
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}
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// WatchedReader is frombus's Reader over w, fetching archives over HTTP.
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func WatchedReader(w *stdio.WatchedStates) frombus.Reader {
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return frombus.StatesReader(Watched{w}, HTTPFetch)
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}
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// HTTPFetch reads an archive over HTTP, at most 256 MiB.
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func HTTPFetch(ctx context.Context, url string) ([]byte, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
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if err != nil {
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return nil, err
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("%s answered %s", url, resp.Status)
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}
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return io.ReadAll(io.LimitReader(resp.Body, 256<<20))
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}
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