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Create NostrDB streaming and async lookup interfaces

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This commit introduces new interfaces for working with NostrDB from
Swift, including `NostrFilter` conversion, subscription streaming via
AsyncStreams and lookup/wait functions.

No user-facing changes.

Changelog-None
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>
This commit is contained in:
Daniel D’Aquino
2025-04-09 22:41:50 -07:00
parent f8185d0ca5
commit 8f32c81b6c
8 changed files with 755 additions and 31 deletions
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31
nostrdb/NdbNote.swift
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@@ -263,27 +263,8 @@ class NdbNote: Codable, Equatable, Hashable {
}
var n = ndb_note_ptr()
var the_kp: ndb_keypair? = nil
if let sec = keypair.privkey {
var kp = ndb_keypair()
memcpy(&kp.secret.0, sec.id.bytes, 32);
if ndb_create_keypair(&kp) <= 0 {
print("bad keypair")
} else {
the_kp = kp
}
}
var len: Int32 = 0
if var the_kp {
len = ndb_builder_finalize(&builder, &n.ptr, &the_kp)
} else {
len = ndb_builder_finalize(&builder, &n.ptr, nil)
}
switch noteConstructionMaterial {
case .keypair(let keypair):
var the_kp: ndb_keypair? = nil
@@ -300,9 +281,9 @@ class NdbNote: Codable, Equatable, Hashable {
}
if var the_kp {
len = ndb_builder_finalize(&builder, &n, &the_kp)
len = ndb_builder_finalize(&builder, &n.ptr, &the_kp)
} else {
len = ndb_builder_finalize(&builder, &n, nil)
len = ndb_builder_finalize(&builder, &n.ptr, nil)
}
if len <= 0 {
@@ -315,7 +296,7 @@ class NdbNote: Codable, Equatable, Hashable {
do {
// Finalize note, save length, and ensure it is higher than zero (which signals finalization has succeeded)
len = ndb_builder_finalize(&builder, &n, nil)
len = ndb_builder_finalize(&builder, &n.ptr, nil)
guard len > 0 else { throw InitError.generic }
let scratch_buf_len = MAX_NOTE_SIZE
@@ -323,11 +304,11 @@ class NdbNote: Codable, Equatable, Hashable {
defer { free(scratch_buf) } // Ensure we deallocate as soon as we leave this scope, regardless of the outcome
// Calculate the ID based on the content
guard ndb_calculate_id(n, scratch_buf, Int32(scratch_buf_len)) == 1 else { throw InitError.generic }
guard ndb_calculate_id(n.ptr, scratch_buf, Int32(scratch_buf_len)) == 1 else { throw InitError.generic }
// Verify the signature against the pubkey and the computed ID, to verify the validity of the whole note
var ctx = secp256k1_context_create(UInt32(SECP256K1_CONTEXT_VERIFY))
guard ndb_note_verify(&ctx, ndb_note_pubkey(n), ndb_note_id(n), ndb_note_sig(n)) == 1 else { throw InitError.generic }
guard ndb_note_verify(&ctx, ndb_note_pubkey(n.ptr), ndb_note_id(n.ptr), ndb_note_sig(n.ptr)) == 1 else { throw InitError.generic }
}
catch {
free(buf)