Struct DefinitionHash 

pub struct DefinitionHash(/* private fields */);

SHA-256 fingerprint of a workflow’s structural definition.

Computed from the workflow’s continuation tree (task IDs, retry policies, fork shapes, delays, signals, loops, child workflows). Used by the runtime to detect when a serialised snapshot was written against a different workflow definition than the one currently in memory.

Compares in a single 32-byte memcmp instead of a 64-character string equality, and hashes to one u64 instead of per-character siphash.

Implementations

impl DefinitionHash

pub const fn from_hash(hash: Hash32) -> Self

Construct a DefinitionHash from a Hash32.

pub const fn from_bytes(bytes: [u8; 32]) -> Self

Construct a DefinitionHash from raw 32 bytes.

pub fn from_slice(bytes: &[u8]) -> Result<Self, Hash32ParseError>

Construct a DefinitionHash from a length-checked byte slice. See Hash32::from_slice.

Errors

Returns Hash32ParseError::WrongLength if bytes.len() != 32.

pub fn sha256(input: impl AsRef<[u8]>) -> Self

SHA-256-hash the given input and wrap the result.

This is the canonical way to mint a fresh id from a human-readable name at construction time.

pub const fn as_hash(&self) -> &Hash32

Borrow the underlying Hash32.

pub const fn as_bytes(&self) -> &[u8; 32]

Borrow the raw 32 bytes.

pub fn to_hex(&self) -> String

Lowercase hex encoding (64 chars).

pub fn from_hex(s: &str) -> Result<Self, Hash32ParseError>

Parse from a 64-character hex string.

Errors

See Hash32::from_hex.

Trait Implementations

impl Clone for DefinitionHash

fn clone(&self) -> DefinitionHash

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DefinitionHash

impl Debug for DefinitionHash

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

Formats the value using the given formatter.

impl Default for DefinitionHash

fn default() -> DefinitionHash

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for DefinitionHash

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for DefinitionHash

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

Formats the value using the given formatter.

impl Eq for DefinitionHash

impl From<&String> for DefinitionHash

fn from(s: &String) -> Self

Converts to this type from the input type.

impl From<&str> for DefinitionHash

fn from(s: &str) -> Self

Converts to this type from the input type.

impl From<DefinitionHash> for Hash32

fn from(h: DefinitionHash) -> Self

Converts to this type from the input type.

impl From<Hash32> for DefinitionHash

fn from(h: Hash32) -> Self

Converts to this type from the input type.

impl From<String> for DefinitionHash

fn from(s: String) -> Self

Converts to this type from the input type.

impl FromStr for DefinitionHash

type Err = Hash32ParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for DefinitionHash

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

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for DefinitionHash

fn cmp(&self, other: &DefinitionHash) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for DefinitionHash

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for DefinitionHash

fn partial_cmp(&self, other: &DefinitionHash) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for DefinitionHash

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 DefinitionHash