43 lines
1.5 KiB
Go
43 lines
1.5 KiB
Go
package catalogue
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import "encoding/json"
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// The sources mesh-config says a resolved value came from, in mesh-config_resolved (novox/hq ADR 0348 §9): a key of
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// it holds {"value": …, "source": …}.
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const (
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SourceMesh = "mesh"
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SourceNode = "node"
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SourceModule = "module"
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)
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// LaidSource says whether a value resolved from source is laid over a module's files: mesh config, node config and the
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// module's own value are; a manifest's default is not, since it is the composition's already and a taken key is laid
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// only when a layer sets it, never from a default (TakesSettingsField); an unset value is not, since a required one is
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// refused by the composition by name. **The one rule for every composer** (issue 1126, C2): the controller's config
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// read and a node composing its own lay the same values, so the two compose the same files.
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func LaidSource(source string) bool {
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switch source {
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case SourceMesh, SourceNode, SourceModule:
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return true
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}
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return false
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}
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// LaidValue is one key of mesh-config_resolved read as a composer lays it: its value, and true when its source is laid
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// (LaidSource) and it holds a value; false for a default, an unset value, a source not known and a value that cannot be
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// read.
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func LaidValue(raw []byte) (any, bool) {
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var r struct {
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Value json.RawMessage `json:"value"`
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Source string `json:"source"`
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}
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if json.Unmarshal(raw, &r) != nil || !LaidSource(r.Source) || len(r.Value) == 0 {
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return nil, false
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}
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var v any
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if json.Unmarshal(r.Value, &v) != nil {
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return nil, false
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}
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return v, true
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}
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