初始

api/v1/common/tool/shp/errreader.go

@@ -0,0 +1,27 @@
+package shp
+
+import (
+	"fmt"
+	"io"
+)
+
+// errReader is a helper to perform multiple successive read from another reader
+// and do the error checking only once afterwards. It will not perform any new
+// reads in case there was an error encountered earlier.
+type errReader struct {
+	io.Reader
+	e error
+	n int64
+}
+
+func (er *errReader) Read(p []byte) (n int, err error) {
+	if er.e != nil {
+		return 0, fmt.Errorf("unable to read after previous error: %v", er.e)
+	}
+	n, err = er.Reader.Read(p)
+	if n < len(p) && err != nil {
+		er.e = err
+	}
+	er.n += int64(n)
+	return n, er.e
+}