Struct RecordHeader 

pub struct RecordHeader {
    pub kind: String,
    pub capsule: String,
    pub created_ms: u64,
    pub truncated: Option<TruncationMarker>,
}

The first line of a record: a JSON object with a type key and no role.

Not a message: every reader of a record skips a line that is not a JSON object carrying a string role, so a header is invisible to murmur:conversation/read, to the threaded reload, and to the total a page reports. Not a sidecar: a sidecar needs a second write that a crash could desynchronise from the rename, where a header makes the whole truncation exactly one atomic rename of one file.

Self::capsule is what makes automatic record pruning store-safe: two capsules pointed at one context.record_store each own only the records their own name is on.

Fields

kind: String

Always [RECORD_HEADER_TYPE]. A first line carrying anything else is not a header.

capsule: String

The capsule that owns this record — name: from its manifest, never the record store.

created_ms: u64

When the header was written, in milliseconds since the epoch. On an adopted record, that is the adoption, not the conversation’s first message.

truncated: Option<TruncationMarker>

Absent until this record has been truncated.

Trait Implementations

impl Clone for RecordHeader

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RecordHeader

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for RecordHeader

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for RecordHeader

impl PartialEq for RecordHeader

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for RecordHeader

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for RecordHeader