50 lines
1.6 KiB
Go
50 lines
1.6 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, fetching archives over HTTP.
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func Reader() frombus.Reader { return frombus.StatesReader(States{}, HTTPFetch) }
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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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