chunks.gno

 1package memba_notes_v1
 2
 3import "strconv"
 4
 5const MaxBodyChunkBytes = 8192
 6
 7func NoteMetaJSON(idHex string) string {
 8	v, ok := notes.Get(idText(readID(idHex)))
 9	if !ok {
10		return "null"
11	}
12	return noteJSON(v.(*note), false)
13}
14
15// Each page is tied to the complete state revision, including access/mode and
16// epoch changes. Clients concatenate binary chunks before decoding UTF8/AEAD.
17func NoteBodyChunkJSON(idHex string, expectedRevision uint64, offset, limit int) string {
18	n := find(readID(idHex))
19	if expectedRevision != n.Revision {
20		panic("notes: stale body revision")
21	}
22	if limit < 1 || limit > MaxBodyChunkBytes || offset < 0 || offset > n.BodyBytes {
23		panic("notes: body chunk bounds")
24	}
25	end := offset + limit
26	if end > n.BodyBytes {
27		end = n.BodyBytes
28	}
29	return `{"id":` + q(idText(n.ID)) + `,"state_revision":` + u(n.Revision) + `,"body_revision":` + u(n.BodyRevision) + `,"epoch":` + u(uint64(n.Epoch)) + `,"offset":` + q(strconv.Itoa(offset)) + `,"total":` + q(strconv.Itoa(n.BodyBytes)) + `,"next_offset":` + q(strconv.Itoa(end)) + `,"chunk_blob":` + blob(n.Body[offset:end]) + `}`
30}