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72 lines
2.5 KiB
Go
72 lines
2.5 KiB
Go
5 months ago
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// +build go1.10
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package gokb
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import (
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"context"
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"database/sql/driver"
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)
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// NoticeHandler returns the notice handler on the given connection, if any. A
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// runtime panic occurs if c is not a kb connection. This is rarely used
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// directly, use ConnectorNoticeHandler and ConnectorWithNoticeHandler instead.
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func NoticeHandler(c driver.Conn) func(*Error) {
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return c.(*conn).noticeHandler
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}
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// SetNoticeHandler sets the given notice handler on the given connection. A
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// runtime panic occurs if c is not a kb connection. A nil handler may be used
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// to unset it. This is rarely used directly, use ConnectorNoticeHandler and
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// ConnectorWithNoticeHandler instead.
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//
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// Note: Notice handlers are executed synchronously by kb meaning commands
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// won't continue to be processed until the handler returns.
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func SetNoticeHandler(c driver.Conn, handler func(*Error)) {
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c.(*conn).noticeHandler = handler
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}
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// NoticeHandlerConnector wraps a regular connector and sets a notice handler
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// on it.
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type NoticeHandlerConnector struct {
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driver.Connector
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noticeHandler func(*Error)
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}
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// Connect calls the underlying connector's connect method and then sets the
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// notice handler.
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func (n *NoticeHandlerConnector) Connect(ctx context.Context) (driver.Conn, error) {
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c, err := n.Connector.Connect(ctx)
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if err == nil {
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SetNoticeHandler(c, n.noticeHandler)
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}
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return c, err
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}
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// ConnectorNoticeHandler returns the currently set notice handler, if any. If
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// the given connector is not a result of ConnectorWithNoticeHandler, nil is
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// returned.
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func ConnectorNoticeHandler(c driver.Connector) func(*Error) {
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if c, ok := c.(*NoticeHandlerConnector); ok {
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return c.noticeHandler
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}
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return nil
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}
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// ConnectorWithNoticeHandler creates or sets the given handler for the given
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// connector. If the given connector is a result of calling this function
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// previously, it is simply set on the given connector and returned. Otherwise,
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// this returns a new connector wrapping the given one and setting the notice
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// handler. A nil notice handler may be used to unset it.
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//
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// The returned connector is intended to be used with database/sql.OpenDB.
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//
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// Note: Notice handlers are executed synchronously by kb meaning commands
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// won't continue to be processed until the handler returns.
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func ConnectorWithNoticeHandler(c driver.Connector, handler func(*Error)) *NoticeHandlerConnector {
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if c, ok := c.(*NoticeHandlerConnector); ok {
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c.noticeHandler = handler
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return c
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}
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return &NoticeHandlerConnector{Connector: c, noticeHandler: handler}
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}
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