jschoubben
ca59b685b0
Builds: design 47 G §57, §345 Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ
82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
package stateobjects
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import (
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"encoding/json"
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"errors"
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stdio "git.novox.be/novox/mesh-sdk/go"
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"git.novox.be/novox/mesh-sdk/go/busstate"
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"git.novox.be/novox/mesh-sdk/go/catalogue"
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)
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// ForState is a state of this module, kept through its runtime: the state by its local name, and its object store
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// `<state>-objects` (catalogue.StateObjectsName).
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func ForState(state string) Values {
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store := catalogue.StateObjectsName(state)
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return Values{KV: BundleKV{State: stdio.State(state)}, Objects: BundleObjects{Store: busstate.ObjectsOf(store)}, Store: store}
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}
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// BundleKV is a state as a bundle reaches it.
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type BundleKV struct{ State stdio.KeptState }
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func (b BundleKV) Get(key string) (*Entry, error) {
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e, err := b.State.Get(key)
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if err != nil || e == nil {
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return nil, err
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}
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return &Entry{Value: e.Value, Revision: e.Revision}, nil
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}
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func changed(err error) error {
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if errors.Is(err, stdio.ErrChanged) {
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return ErrChanged
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}
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return err
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}
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func (b BundleKV) Create(key string, value []byte) error {
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_, err := b.State.Create(key, json.RawMessage(value))
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return changed(err)
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}
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func (b BundleKV) Update(key string, value []byte, revision uint64) error {
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_, err := b.State.Update(key, json.RawMessage(value), revision)
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return changed(err)
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}
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func (b BundleKV) Delete(key string) error { return b.State.Delete(key) }
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func (b BundleKV) Keys() ([]string, error) { return b.State.Keys() }
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// BundleObjects is an object store as a bundle reaches it.
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type BundleObjects struct{ Store busstate.Objects }
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// BundleObjectMost is the largest object a bundle puts in one call: the runtime's channel carries a message of 16 MiB, and
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// the bytes travel in it as base64.
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const BundleObjectMost = 8 << 20
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// MostBytes is BundleObjectMost: a larger value is refused, loudly, until the design decides how a bundle keeps one.
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func (BundleObjects) MostBytes() int { return BundleObjectMost }
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func (b BundleObjects) Put(name string, data []byte) error {
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_, err := b.Store.Put(name, data, "a value kept beside its key")
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return err
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}
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func (b BundleObjects) Get(name string) ([]byte, error) {
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d, err := b.Store.Get(name)
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return d.Data, err
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}
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func (b BundleObjects) Delete(name string) error { return b.Store.Delete(name) }
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func (b BundleObjects) List() ([]Object, error) {
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l, err := b.Store.List()
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out := make([]Object, 0, len(l))
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for _, o := range l {
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if !o.Deleted {
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out = append(out, Object{Name: o.Name, Size: int64(o.Size), Modified: o.Modified})
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}
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}
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return out, err
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}
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