Struct hdk::prelude::Update

pub struct Update {
    pub author: HoloHash<Agent>,
    pub timestamp: Timestamp,
    pub header_seq: u32,
    pub prev_header: HoloHash<Header>,
    pub original_header_address: HoloHash<Header>,
    pub original_entry_address: HoloHash<Entry>,
    pub entry_type: EntryType,
    pub entry_hash: HoloHash<Entry>,
}

A header which specifies that some new Entry content is intended to be an update to some old Entry.

This header semantically updates an entry to a new entry. It has the following effects:

• Create a new Entry
• This is the header of that new entry
• Create a metadata relationship between the original entry and this new header

The original header is required to prevent update loops: If you update A to B and B back to A, and then you don’t know which one came first, or how to break the loop.

Fields

author: HoloHash<Agent>

timestamp: Timestamp

header_seq: u32

prev_header: HoloHash<Header>

original_header_address: HoloHash<Header>

original_entry_address: HoloHash<Entry>

entry_type: EntryType

entry_hash: HoloHash<Entry>

Implementations

impl Update

pub fn from_builder(
    common: HeaderBuilderCommon,
    original_entry_address: HoloHash<Entry>,
    original_header_address: HoloHash<Header>,
    entry_type: EntryType,
    entry_hash: HoloHash<Entry>
) -> Update

Trait Implementations

impl Clone for Update

fn clone(&self) -> Update

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Update

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Update

fn deserialize<__D>(
    __deserializer: __D
) -> Result<Update, <__D as Deserializer<'de>>::Error> where
    __D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.

impl From<(Update, HeaderBuilderCommon)> for Update

fn from((Update, HeaderBuilderCommon)) -> Update

Converts to this type from the input type.

impl From<Update> for EntryCreationHeader

fn from(u: Update) -> EntryCreationHeader

Converts to this type from the input type.

impl Hash for Update

fn hash<__H>(&self, state: &mut __H) where
    __H: Hasher, 

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl HashableContent for Update

type HashType = Header

The HashType which this content will be hashed to

fn hash_type(&self) -> <Update as HashableContent>::HashType

The HashType which this content will be hashed to

fn hashable_content(&self) -> HashableContentBytes

Return a subset of the content, either as SerializedBytes “content”, which will be used to compute the hash, or as an already precomputed hash which will be used directly

impl HeaderBuilder<Update> for Update

fn build(self, common: HeaderBuilderCommon) -> Update

impl HeaderInner for Update

fn into_header(self) -> Header

Get a full header from the subset

impl PartialEq<Update> for Update

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl Serialize for Update

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

Serialize this value into the given Serde serializer.

impl<'_> TryFrom<&'_ Update> for SerializedBytes

type Error = SerializedBytesError

The type returned in the event of a conversion error.

fn try_from(t: &Update) -> Result<SerializedBytes, SerializedBytesError>

Performs the conversion.

impl<'a> TryFrom<&'a Header> for &'a Update

type Error = WrongHeaderError

The type returned in the event of a conversion error.

fn try_from(
    value: &'a Header
) -> Result<&'a Update, <&'a Update as TryFrom<&'a Header>>::Error>

Performs the conversion.

impl TryFrom<Header> for Update

type Error = WrongHeaderError

The type returned in the event of a conversion error.

fn try_from(value: Header) -> Result<Update, <Update as TryFrom<Header>>::Error>

Performs the conversion.

impl TryFrom<SerializedBytes> for Update

type Error = SerializedBytesError

The type returned in the event of a conversion error.

fn try_from(sb: SerializedBytes) -> Result<Update, SerializedBytesError>

Performs the conversion.

impl TryFrom<Update> for SerializedBytes

type Error = SerializedBytesError

The type returned in the event of a conversion error.

fn try_from(t: Update) -> Result<SerializedBytes, SerializedBytesError>

Performs the conversion.

impl Eq for Update

impl StructuralEq for Update

impl StructuralPartialEq for Update