support for shinkmulti

I tested having multiple contexts, but cancel issued
an error and I did not think now was worth trying to
debug.

Signed-off-by: vsoch <vsoch@users.noreply.github.com>

cmd/test/test.go

@@ -192,6 +192,12 @@ func main() {
 		log.Fatalf("Error in ReapiClient MatchSatisfy - asking for 4 nodes with only 3 should fail: %v\n", err)
 	}
 
+	fmt.Println("Asking to ShrinkMulti by 2 nodes")
+	err = cli.ShrinkMulti([]string{"/tiny0/rack0/node3", "/tiny0/rack0/node1"})
+	if err != nil {
+		log.Fatalf("Error in ReapiClient ShrinkMulti: %s %s\n", err, cli.GetErrMsg())
+	}
+	fmt.Printf("Shrink request return value: %v\n", err)
 }
 
 func printOutput(reserved bool, allocated string, at int64, jobid uint64, err error) {

pkg/fluxcli/reapi_cli.go

@@ -252,6 +252,20 @@ func (cli *ReapiClient) Shrink(rNodePath string) (err error) {
 	return retvalToError(fluxerr, "issue resource api client shrink")
 }
 
+// ShrinkMulti issues multiple shrink requests to the API
+func (cli *ReapiClient) ShrinkMulti(rNodePaths []string) (err error) {
+	var fluxerr int
+	for _, rNodePath := range rNodePaths {
+		var nodePath = C.CString(rNodePath)
+		fluxerr := (int)(C.reapi_cli_shrink((*C.struct_reapi_cli_ctx)(cli.ctx), nodePath))
+		defer C.free(unsafe.Pointer(nodePath))
+		if fluxerr != 0 {
+			return retvalToError(fluxerr, "issue resource api client shrink")
+		}
+	}
+	return retvalToError(fluxerr, "issue resource api client shrink")
+}
+
 // Cancel cancels the allocation or reservation corresponding to jobid.
 //
 //	\param jobid     jobid of the uint64_t type.