Forgot to paste in an example, see below:
func run(dsn string) {
// install the wrapped driver
sql.Register("postgres-mw", sqlmw.Driver(pq.Dirver{},
new(sqlInterceptor)))
db, err := sql.Open("postgres-mw", dsn)
...
}
type sqlInterceptor struct {
sqlmw.NullInterceptor
}
func (in *sqlInterceptor) StmtQueryContext(ctx context.Context, conn
driver.StmtQueryContext, query string, args []driver.NamedValue)
(driver.Rows, error) {
startedAt := time.Now()
rows, err := conn.QueryContext(ctx, args)
log.Debug("executed sql query", "duration",
time.Since(startedAt), "query", query, "args", args, "err", err)
return rows, err
}
On Thu, Jan 16, 2020 at 5:16 AM Alan Shreve <a...@inconshreveable.com>
wrote:
> Hi golang-nuts -
>
> This is an abstraction that we needed at ngrok. It allows you to
> intermediate calls to a database/sql Driver just like a client-side grpc
> interceptor would. This makes it an excellent abstraction layer upon which
> to build instrumentation and other middleware-like functionality.
>
> There are a number of similar projects which provided instrumentation for
> logging/tracing and a few others that were aimed solely at providing
> callbacks for instrumentation, but I realized a more general-purpose
> abstraction would provide more power to the programmer by providing the
> ability to intercept and modify calls and return values.
>
> Hope it's helpful to others. Feedback appreciated.
>
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