Struct Checkpoint 

pub struct Checkpoint {
    pub v: i32,
    pub id: String,
    pub ts: String,
    pub channel_values: HashMap<String, Value>,
    pub channel_versions: HashMap<String, i32>,
    pub versions_seen: HashMap<String, HashMap<String, i32>>,
    pub thread_id: Option<String>,
    pub parent_id: Option<String>,
}

A checkpoint representing the state of a graph at a point in time.

Checkpoints are compatible with the Python LangGraph wire format, allowing interoperability between Rust and Python implementations.

Fields

v: i32

Checkpoint format version

id: String

Unique checkpoint identifier

ts: String

Timestamp when checkpoint was created

channel_values: HashMap<String, Value>

The values of all channels at this checkpoint

channel_versions: HashMap<String, i32>

Version numbers for each channel

versions_seen: HashMap<String, HashMap<String, i32>>

Versions seen by each channel (for tracking updates)

thread_id: Option<String>

Thread ID this checkpoint belongs to

parent_id: Option<String>

Parent checkpoint ID (for nested graphs/subgraphs)

Implementations

impl Checkpoint

pub fn new() -> Self

Create a new empty checkpoint

pub fn with_thread_id(self, thread_id: impl Into<String>) -> Self

Create a checkpoint with a specific thread ID

pub fn set_channel(&mut self, name: impl Into<String>, value: Value)

Set a channel value

pub fn get_channel(&self, name: &str) -> Option<&Value>

Get a channel value

Trait Implementations

impl Clone for Checkpoint

fn clone(&self) -> Checkpoint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Checkpoint

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

Formats the value using the given formatter.

impl Default for Checkpoint

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Checkpoint

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Checkpoint

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

where __S: Serializer,

Serialize this value into the given Serde serializer.