Struct MsgPackCodec 

pub struct MsgPackCodec;

Available on crate feature msgpack only.

MessagePack binary codec

This codec produces compact binary output, suitable for high-throughput scenarios where bandwidth is limited.

Note: MessagePack is not MCP-compliant for external communication but can be used for internal message passing.

Security Considerations

When using MessagePack for untrusted input, be aware of:

Nesting Depth

Deeply nested structures can cause stack overflow. The underlying rmp-serde library has default recursion limits, but extremely nested payloads may still cause issues. Consider validating message structure before decoding.

Binary Field Size

MessagePack can encode arbitrarily large binary/string fields. Applications should:

• Enforce maximum message size limits at the transport layer
• Use streaming decoders for large payloads when possible
• Set appropriate memory limits in production environments

Type Confusion

MessagePack’s dynamic typing can lead to type confusion attacks. Always:

• Validate deserialized data matches expected schema
• Use strongly-typed Rust structs rather than serde_json::Value
• Check for unexpected field types after deserialization

Recommended Usage

For production systems handling untrusted input, prefer JSON (with schema validation) or use MessagePack only within trusted boundaries (internal microservices, etc.).

Implementations

impl MsgPackCodec

pub fn new() -> Self

Create a new MessagePack codec

Trait Implementations

impl Clone for MsgPackCodec

fn clone(&self) -> MsgPackCodec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Codec for MsgPackCodec

fn encode<T: Serialize>(&self, value: &T) -> CodecResult<Vec<u8>>

Encode a value to bytes

fn decode<T: DeserializeOwned>(&self, bytes: &[u8]) -> CodecResult<T>

Decode bytes to a value

fn content_type(&self) -> &'static str

Get the content type for this codec (e.g., “application/json”)

fn supports_streaming(&self) -> bool

Check if this codec supports streaming

fn name(&self) -> &'static str

Get codec name for debugging

impl Debug for MsgPackCodec

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

Formats the value using the given formatter.

impl Default for MsgPackCodec

fn default() -> MsgPackCodec

Returns the “default value” for a type.