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5669016af0
issue: #38399 - Make the wal scanner interface same with streaming scanner. - Use wal if the wal is located at current node. - Otherwise fallback the old logic. Signed-off-by: chyezh <chyezh@outlook.com>
39 lines
1.2 KiB
Go
39 lines
1.2 KiB
Go
package message
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import (
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"context"
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"github.com/cockroachdb/errors"
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)
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var ErrUpstreamClosed = errors.New("upstream closed")
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// HandleParam is the parameter for handler.
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type HandleParam struct {
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Ctx context.Context
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Upstream <-chan ImmutableMessage
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Message ImmutableMessage
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TimeTickChan <-chan struct{}
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}
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// HandleResult is the result of handler.
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type HandleResult struct {
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Incoming ImmutableMessage // Not nil if upstream return new message.
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MessageHandled bool // True if Message is handled successfully.
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TimeTickUpdated bool // True if TimeTickChan is triggered.
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Error error // Error is context is canceled.
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}
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// Handler is used to handle message read from log.
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type Handler interface {
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// Handle is the callback for handling message.
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// Return true if the message is consumed, false if the message is not consumed.
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// Should return error if and only if ctx is done.
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// !!! It's a bad implementation for compatibility for msgstream,
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// will be removed in the future.
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Handle(param HandleParam) HandleResult
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// Close is called after all messages are handled or handling is interrupted.
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Close()
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}
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