fixes #issue 42. add num for each key and sort keys by num. make sure keys in map can be sorted.

Makefile

@@ -41,6 +41,7 @@ $(GO_DEPS): go.mod $(PATCHES)
 	patch -d vendor -p0 < patches/gnmi_cli.all.patch
 	patch -d vendor -p0 < patches/gnmi_set.patch
 	patch -d vendor -p0 < patches/gnmi_get.patch
+	patch -d vendor -p0 < patches/xpath.patch
 	git apply patches/0001-Updated-to-filter-and-write-to-file.patch
 	touch $@
 

patches/xpath.patch

@@ -0,0 +1,34 @@
+--- ./github.com/jipanyang/gnxi/utils/xpath/xpath.go	2022-10-25 16:16:00.239783329 +0800
++++ ./github.com/jipanyang/gnxi/utils/xpath/xpath.go	2022-10-25 15:56:18.336168598 +0800
+@@ -20,6 +20,7 @@
+ 	"fmt"
+ 	"regexp"
+ 	"strings"
++	"strconv"
+ )
+
+ var (
+@@ -135,9 +136,10 @@
+ // For example, given
+ //	"[k1=v1][k2=v2]",
+ // this API returns
+-//	map[string]string{"k1": "v1", "k2": "v2"}.
++//	map[string]string{"[0]k1": "v1", "[1]k2": "v2"}.
+ func parseKeyValueString(str string) (map[string]string, error) {
+ 	keyValuePairs := make(map[string]string)
++	var num int = 0
+ 	// begin marks the beginning of a key-value pair.
+ 	begin := 0
+ 	// end marks the end of a key-value pair.
+@@ -170,7 +172,10 @@
+ 				// Recover escaped '[' and ']'.
+ 				val = strings.Replace(val, `\]`, `]`, -1)
+ 				val = strings.Replace(val, `\[`, `[`, -1)
+-				keyValuePairs[key] = val
++//				keyValuePairs[key] = val
++				key_with_num := "[" + strconv.Itoa(num) + "]" + key
++				keyValuePairs[key_with_num] = val
++				num++
+ 				begin = end + 1
+ 			}
+ 			end++

transl_utils/transl_utils.go

@@ -12,7 +12,8 @@ import (
 	"context"
 	"log/syslog"
 	"github.com/Azure/sonic-mgmt-common/translib/tlerr"
-
+	"strconv"
+	"sort"
 )
 
 var (
@@ -80,6 +81,9 @@ func ConvertToURI(prefix *gnmipb.Path, path *gnmipb.Path, req *string) error {
 	elems := fullPath.GetElem()
 	*req = "/"
 
+	num_key_map := make(map[int]string)
+	key_val_map := make(map[string]string)
+
 	if elems != nil {
 		/* Iterate through elements. */
 		for i, elem := range elems {
@@ -94,8 +98,33 @@ func ConvertToURI(prefix *gnmipb.Path, path *gnmipb.Path, req *string) error {
 			/* If keys are present , process the keys. */
 			if key != nil {
 				for k, v := range key {
-					log.V(6).Infof("elem : %#v %#v", k, v)
-					*req += "[" + k + "=" + v + "]"
+					if strings.Contains(k, "[") && strings.Contains(k, "]") {
+						num_str := k[strings.Index(k, "[") + 1 : strings.Index(k, "]")]
+						key_del_num := k[strings.Index(k, "]") + 1 : len(k)]
+						num, err := strconv.Atoi(num_str)
+						if err != nil {
+							return err
+						}
+						num_key_map[num] = key_del_num
+						key_val_map[key_del_num] = v
+					} else {
+						log.V(6).Infof("elem : %#v %#v", k, v)
+						*req += "[" + k + "=" + v + "]"
+					}
+				}
+
+				if len(num_key_map) != 0 {
+					log.V(6).Infof("num_key_map : %#v", num_key_map)
+					log.V(6).Infof("key_val_map : %#v", key_val_map)
+
+					var num_list []int
+					for num_key_map_k := range num_key_map {
+					    num_list = append(num_list, num_key_map_k)
+					}
+					sort.Ints(num_list)
+					for _, num_list_v := range num_list {
+					    *req += "[" + num_key_map[num_list_v] + "=" + key_val_map[num_key_map[num_list_v]] + "]"
+					}
 				}
 
 				/* Append "/" after all keys are processed. */