fix(simulator): better fake uuid + hash values in simulator (b78286a1) · Commits · GitLab.org / orbit / GitLab Knowledge Graph

crates/simulator/src/generator/fake_data.rs

+19 −11

Original line number	Diff line number	Diff line
		@@ -277,12 +277,18 @@ impl FakeValueGenerator {
		FakeValue::String(self.emit_buf())
		}
		FieldKind::ShaOrHash => {
		// 40-char hex (160 bits) - use fixed-width formatting
		// 40-char hex (160 bits) — only 128 bits of entropy available,
		// so the top 32 bits (8 hex digits) are filled from `high`.
		self.buf.clear();
		self.buf.reserve(40);
		let val = ((bits as u128) << 64) \| (low as u128);
		for i in (0..40).rev() {
		let nibble = ((val >> (i * 4)) & 0xf) as usize;
		let lo128 = ((bits as u128) << 64) \| (low as u128);
		let hi32 = high;
		for i in (0..8).rev() {
		let nibble = ((hi32 >> (i * 4)) & 0xf) as usize;
		self.buf.push(HEX_DIGITS[nibble] as char);
		}
		for i in (0..32).rev() {
		let nibble = ((lo128 >> (i * 4)) & 0xf) as usize;
		self.buf.push(HEX_DIGITS[nibble] as char);
		}
		FakeValue::String(self.emit_buf())
		@@ -387,32 +393,34 @@ impl FakeValueGenerator {
		FakeValue::static_string("unknown")
		}
		FieldKind::Uuid => {
		let bits2 = self.next_random();
		self.buf.clear();
		self.buf.reserve(36);
		// 8-4-4-4-12 hex format
		// 8-4-4-4-12 hex format (32 hex digits = 128 bits)
		// Use `bits` for the first 16 hex digits, `bits2` for the last 16.
		for i in (0..8).rev() {
		self.buf
		.push(HEX_DIGITS[((bits >> (i * 4)) & 0xf) as usize] as char);
		}
		self.buf.push('-');
		for i in (0..4).rev() {
		for i in (8..12).rev() {
		self.buf
		.push(HEX_DIGITS[((high >> (i * 4)) & 0xf) as usize] as char);
		.push(HEX_DIGITS[((bits >> (i * 4)) & 0xf) as usize] as char);
		}
		self.buf.push('-');
		for i in (4..8).rev() {
		for i in (12..16).rev() {
		self.buf
		.push(HEX_DIGITS[((high >> (i * 4)) & 0xf) as usize] as char);
		.push(HEX_DIGITS[((bits >> (i * 4)) & 0xf) as usize] as char);
		}
		self.buf.push('-');
		for i in (0..4).rev() {
		self.buf
		.push(HEX_DIGITS[((low >> (i * 4)) & 0xf) as usize] as char);
		.push(HEX_DIGITS[((bits2 >> (i * 4)) & 0xf) as usize] as char);
		}
		self.buf.push('-');
		for i in (4..16).rev() {
		self.buf
		.push(HEX_DIGITS[((low >> (i * 4)) & 0xf) as usize] as char);
		.push(HEX_DIGITS[((bits2 >> (i * 4)) & 0xf) as usize] as char);
		}
		FakeValue::String(self.emit_buf())
		}