isle/go/daemon/jigs.go

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package daemon
import (
"context"
"time"
"dev.mediocregopher.com/mediocre-go-lib.git/mlog"
)
// until keeps trying fn until it returns nil, returning true. If the context is
// canceled then until returns false.
func until(
ctx context.Context,
logger *mlog.Logger,
descr string,
fn func(context.Context) error,
) bool {
for {
logger.Info(ctx, descr)
err := fn(ctx)
if err == nil {
return true
} else if ctxErr := ctx.Err(); ctxErr != nil {
return false
}
logger.Warn(ctx, descr+" failed, retrying in one second", err)
time.Sleep(1 * time.Second)
}
}