Enum CqlResponseKind

#[non_exhaustive]
pub enum CqlResponseKind {
    Error,
    Ready,
    Authenticate,
    Supported,
    Result,
    Event,
    AuthChallenge,
    AuthSuccess,
}

Possible CQL responses received from the server

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Error

Indicates an error processing a request.

Ready

Indicates that the server is ready to process queries. This message will be sent by the server either after a STARTUP message if no authentication is required (if authentication is required, the server indicates readiness by sending a AUTH_RESPONSE message).

Authenticate

Indicates that the server requires authentication, and which authentication mechanism to use. The authentication is SASL based and thus consists of a number of server challenges (AUTH_CHALLENGE) followed by client responses (AUTH_RESPONSE). The initial exchange is however bootstrapped by an initial client response. The details of that exchange (including how many challenge-response pairs are required) are specific to the authenticator in use. The exchange ends when the server sends an AUTH_SUCCESS message or an ERROR message.

This message will be sent following a STARTUP message if authentication is required and must be answered by a AUTH_RESPONSE message from the client.

Supported

Indicates which startup options are supported by the server. This message comes as a response to an OPTIONS message.

Result

The result to a query (QUERY, PREPARE, EXECUTE or BATCH messages). It has multiple kinds:

• Void: for results carrying no information.
• Rows: for results to select queries, returning a set of rows.
• Set_keyspace: the result to a USE statement.
• Prepared: result to a PREPARE message.
• Schema_change: the result to a schema altering statement.

Event

An event pushed by the server. A client will only receive events for the types it has REGISTER-ed to. The valid event types are:

• “TOPOLOGY_CHANGE”: events related to change in the cluster topology. Currently, events are sent when new nodes are added to the cluster, and when nodes are removed.
• “STATUS_CHANGE”: events related to change of node status. Currently, up/down events are sent.
• “SCHEMA_CHANGE”: events related to schema change. The type of changed involved may be one of “CREATED”, “UPDATED” or “DROPPED”.

AuthChallenge

A server authentication challenge (see AUTH_RESPONSE for more details). Clients are expected to answer the server challenge with an AUTH_RESPONSE message.

AuthSuccess

Indicates the success of the authentication phase.

Trait Implementations

impl Clone for CqlResponseKind

fn clone(&self) -> CqlResponseKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CqlResponseKind

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

Formats the value using the given formatter.

impl Display for CqlResponseKind

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

Formats the value using the given formatter.

impl Copy for CqlResponseKind