kafrust-protocol 0.2.4

Kafka wire protocol primitives for kafrust.
Documentation 
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mod decode;
mod encode;

pub use decode::{DecodeLimits, Decoder, TaggedField};
pub use encode::Encoder;

#[cfg(test)]
#[allow(clippy::unwrap_used)]
mod tests {
    use super::{DecodeLimits, Decoder, Encoder};
    use crate::Error;

    #[test]
    fn encodes_and_decodes_fixed_width_primitives() {
        let mut encoder = Encoder::new();
        encoder.write_bool(true);
        encoder.write_i16(0x1234);
        encoder.write_i32(0x1234_5678);
        encoder.write_i64(0x0102_0304_0506_0708);
        encoder.write_f64(123.5);

        let bytes = encoder.into_bytes();
        assert_eq!(
            bytes,
            [
                1, 0x12, 0x34, 0x12, 0x34, 0x56, 0x78, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
                0x08, 0x40, 0x5e, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00,
            ]
        );

        let mut decoder = Decoder::new(&bytes);
        assert!(decoder.read_bool().unwrap());
        assert_eq!(decoder.read_i16().unwrap(), 0x1234);
        assert_eq!(decoder.read_i32().unwrap(), 0x1234_5678);
        assert_eq!(decoder.read_i64().unwrap(), 0x0102_0304_0506_0708);
        assert_eq!(decoder.read_f64().unwrap(), 123.5);
        assert!(decoder.is_empty());
    }

    #[test]
    fn encodes_and_decodes_nullable_strings_and_bytes() {
        let mut encoder = Encoder::new();
        encoder.write_nullable_string(Some("topic")).unwrap();
        encoder.write_nullable_string(None).unwrap();
        encoder.write_nullable_bytes(Some(&[1, 2, 3])).unwrap();
        encoder.write_nullable_bytes(None).unwrap();

        let bytes = encoder.into_bytes();
        let mut decoder = Decoder::new(&bytes);
        assert_eq!(
            decoder.read_nullable_string().unwrap(),
            Some("topic".to_owned())
        );
        assert_eq!(decoder.read_nullable_string().unwrap(), None);
        assert_eq!(decoder.read_nullable_bytes().unwrap(), Some(vec![1, 2, 3]));
        assert_eq!(decoder.read_nullable_bytes().unwrap(), None);
        assert!(decoder.is_empty());
    }

    #[test]
    fn encodes_and_decodes_compact_types_and_empty_tags() {
        let mut encoder = Encoder::new();
        encoder.write_unsigned_varint(300);
        encoder.write_compact_string("kafka").unwrap();
        encoder.write_compact_nullable_string(None).unwrap();
        encoder.write_compact_bytes(&[9, 8]).unwrap();
        encoder.write_empty_tagged_fields();

        let bytes = encoder.into_bytes();
        let mut decoder = Decoder::new(&bytes);
        assert_eq!(decoder.read_unsigned_varint().unwrap(), 300);
        assert_eq!(decoder.read_compact_string().unwrap(), "kafka");
        assert_eq!(decoder.read_compact_nullable_string().unwrap(), None);
        assert_eq!(decoder.read_compact_bytes().unwrap(), vec![9, 8]);
        assert_eq!(decoder.read_tagged_fields().unwrap(), Vec::new());
        assert!(decoder.is_empty());
    }

    #[test]
    fn decodes_signed_varints() {
        let mut decoder = Decoder::new(&[0x02, 0x01, 0x04, 0x03]);

        assert_eq!(decoder.read_varint().unwrap(), 1);
        assert_eq!(decoder.read_varint().unwrap(), -1);
        assert_eq!(decoder.read_varlong().unwrap(), 2);
        assert_eq!(decoder.read_varlong().unwrap(), -2);
        assert!(decoder.is_empty());
    }

    #[test]
    fn rejects_invalid_bool_and_short_input() {
        let mut decoder = Decoder::new(&[2]);
        assert_eq!(decoder.read_bool(), Err(Error::InvalidBool(2)));

        let mut decoder = Decoder::new(&[0]);
        assert!(matches!(
            decoder.read_i16(),
            Err(Error::UnexpectedEof {
                needed: 2,
                remaining: 1
            })
        ));
    }

    #[test]
    fn rejects_arrays_before_allocating_above_the_configured_limit() {
        let limits = DecodeLimits::new().with_max_array_elements(2);

        let array_length = 3_i32.to_be_bytes();
        let mut decoder = Decoder::with_limits(&array_length, limits);
        assert_eq!(
            decoder.read_array("test array", |_| Ok(())).unwrap_err(),
            Error::LimitExceeded {
                kind: "test array",
                actual: 3,
                max: 2,
            }
        );

        let mut decoder = Decoder::with_limits(&[4], limits);
        assert_eq!(
            decoder
                .read_compact_array("compact test array", |_| Ok(()))
                .unwrap_err(),
            Error::LimitExceeded {
                kind: "compact test array",
                actual: 3,
                max: 2,
            }
        );

        let mut decoder = Decoder::with_limits(&[3], limits);
        assert_eq!(
            decoder.read_tagged_fields().unwrap_err(),
            Error::LimitExceeded {
                kind: "tagged fields",
                actual: 3,
                max: 2,
            }
        );
    }
}