Enum ServerMessage 

pub enum ServerMessage {
    Data {
        subscription_id: String,
        data: Value,
        sequence: u64,
        watermark: Option<i64>,
    },
    Subscribed {
        subscription_id: String,
    },
    Error {
        message: String,
    },
    Heartbeat {
        server_time: i64,
    },
    BackpressureWarning {
        buffer_pct: u8,
    },
}

Messages sent from the WebSocket sink server to clients.

The type field in the JSON object determines which variant is serialized. Data messages include monotonically increasing sequence numbers for client-side gap detection.

Variants

Data

Data delivery containing query results.

Fields

subscription_id: String

Subscription this data belongs to.

data: Value

The payload (format depends on client’s requested SinkFormat).

sequence: u64

Monotonically increasing sequence number for gap detection.

watermark: Option<i64>

Current watermark (epoch millis), if available.

Subscribed

Subscription confirmed – sent after a successful Subscribe request.

Fields

subscription_id: String

Unique identifier for this subscription.

Error

Error message sent to the client.

Fields

message: String

Human-readable error description.

Heartbeat

Periodic heartbeat from the server.

Fields

server_time: i64

Server timestamp (epoch millis).

BackpressureWarning

Backpressure warning indicating the server’s send buffer is filling up.

Fields

buffer_pct: u8

Percentage of the send buffer currently used (0-100).

Trait Implementations

impl Clone for ServerMessage

fn clone(&self) -> ServerMessage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ServerMessage

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

Formats the value using the given formatter.

impl Serialize for ServerMessage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.