Query task group state failed in rust.

[glen0125]

When I query task group state in rust, it returns err: (InvalidFormat, parse json string error: value=Download, err: (InvalidParam, unknown trans group type: Download, None), None)

rust code:
stack.trans().get_task_group_state(TransGetTaskGroupStateOutputRequest { common: NDNOutputRequestCommon { req_path: None, dec_id: None, level: NDNAPILevel::Router, target: Some(ood_id.clone()), referer_object: vec![], flags: 0, }, group: group_id.clone(), group_type: TransTaskGroupType::Download, speed_when: None, }).await

[lurenpluto]

This should be caused by the inconsistency between the default serde codec format of the TransTaskGroupType enumeration type and the ToString trait implementation

Request initiation side (cyfs-lib)
TransGetTaskGroupStateOutputRequest uses the serde macro implementation

CYFS/src/component/cyfs-lib/src/trans/output_request.rs

Lines 259 to 265 in e5e8b3a

	#[derive(Debug, Serialize, Deserialize)]
	pub struct TransGetTaskGroupStateOutputRequest {
	pub common: NDNOutputRequestCommon,
	pub group_type: TransTaskGroupType,
	pub group: String,
	pub speed_when: Option<u64>,
	}

Receiving request side (cyfs-stack)
TransGetTaskGroupStateInputRequest uses the older JsonCodec encoding, while the encoding of the TransTaskGroupType field here uses the FromString implementation, and required is all lowercase

So the problem is either that the FromtStr trait implementation of TransTaskGroupType is compatible with both forms of strings, or TransTaskGroupType needs to use a uniform encoding

[lurenpluto]

The json encoding of TransTaskGroupType has been fixed using serde_with crate and is now based on the ToString(Display trait) and FromStr trait implementations, consistent with the JsonCodec implementation:

CYFS/src/component/cyfs-lib/src/trans/output_request.rs

Lines 225 to 230 in 8dca8fc

	#[derive(Clone, Copy, Debug, Eq, PartialEq)]
	#[derive(serde_with::SerializeDisplay, serde_with::DeserializeFromStr)]
	pub enum TransTaskGroupType {
	Download,
	Upload
	}

[glen0125]

Great job, looking forward to using the new version soon