fix: obey main context

runner.go

@@ -37,9 +37,9 @@ type Writer interface {
 	Write(context.Context, []string) error
 }
 
-// Process accepts string slice, does what it should
+// Processor accepts string slice, does what it should
 // and returns output. Non-nil error returned
-// by Processor terminates stops further processing.
+// by Processor stops further processing.
 type Processor func(context.Context, []string) ([]string, error)
 
 type RunConfig struct {
@@ -118,6 +118,7 @@ func Run(ctx context.Context, r RunConfig) error {
 		return nil
 	})
 
+	// run processing routines
 	grp.Go(func() error {
 		// will close write chan once
 		// all workers are done
@@ -136,12 +137,16 @@ func Run(ctx context.Context, r RunConfig) error {
 					}
 
 					wrch <- result
+
+					// if one of workers died or parent context expired
+					// we should die too
+					if err := innrctx.Err(); err != nil {
+						return nil
+					}
 				}
 
 				return nil
-
 			})
-
 		}
 
 		if err := workergrp.Wait(); err != nil {