Struct FetchOk 

pub struct FetchOk {
    pub end_of_track: u8,
    pub end_group: VarInt,
    pub end_object: VarInt,
    pub parameters: Vec<KeyValuePair>,
    pub track_properties: Vec<KeyValuePair>,
}

FETCH_OK (0x18). end_of_track is uint8.

Byte-identical to draft-19; the field that changed meaning is FetchOk::end_object.

Fields

end_of_track: u8

end_group: VarInt

end_object: VarInt

The Object ID of the last Object the response covers, inclusive.

This is the silent off-by-one of the revision, and it is absent from draft-20’s own change log. Draft-19 Section 10.13 defined the pair as “the end of the range covered by the FETCH response, using the same encoding as the FETCH request End Location (the last Object, plus 1; or 0 to indicate the entire Group)”. Draft-20 Section 10.14 drops that parenthesis entirely, and Sections 5.1.2 and 10.13 both say the Location filter “specifies an inclusive range of Locations”.

So both draft-19 conventions are gone: there is no plus one, and an Object of 0 now means object 0 rather than the whole group. The bytes are identical between the two drafts and the meaning is not, and nothing on the wire distinguishes them — an encoder ported forward with its arithmetic intact fetches one object too many, and one whose end lands on object 0 fetches a single object where it used to fetch a group.

Ambiguous, and the draft leaves it so. When the request’s filter omitted EndObject, so the filter meant “all objects in the End Group”, Section 10.14 does not say what to report — and with the 0-means-whole-group encoding gone there is no way left to spell it. The same applies to a relative start. The reading this codec’s corpus takes, and the only sane one, is the Object ID of the last Object actually covered; the draft does not say so, and nothing here can enforce it, because resolving it needs the track rather than the frame.

parameters: Vec<KeyValuePair>

track_properties: Vec<KeyValuePair>

Trait Implementations

impl Clone for FetchOk

fn clone(&self) -> FetchOk

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FetchOk

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for FetchOk

impl PartialEq for FetchOk

fn eq(&self, other: &FetchOk) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for FetchOk