[yang]SONiC Yang model support for Telemetry_client. (#12483) (#13314)

#### Why I did it
Create SONIC Yang model for Telemetry_client
#### How I did it
Defined Yang models  based on Guideline doc:
https://github.com/Azure/SONiC/blob/master/doc/mgmt/SONiC_YANG_Model_Guidelines.md
and
https://github.com/Azure/sonic-utilities/blob/master/doc/Command-Reference.md
#### How to verify it
Added test cases to verify it.

src/sonic-yang-models/doc/Configuration.md

@@ -1,3 +1,4 @@
+=======
 # SONiC Configuration Database Manual
 
 Table of Contents

src/sonic-yang-models/setup.py

@@ -151,6 +151,7 @@ setup(
                          './yang-models/sonic-system-tacacs.yang',
                          './yang-models/sonic-system-radius.yang',
                          './yang-models/sonic-telemetry.yang',
+                         './yang-models/sonic-telemetry_client.yang',
                          './yang-models/sonic-gnmi.yang',
                          './yang-models/sonic-tunnel.yang',
                          './yang-models/sonic-types.yang',
@@ -231,6 +232,7 @@ setup(
                          './cvlyang-models/sonic-system-aaa.yang',
                          './cvlyang-models/sonic-system-tacacs.yang',
                          './cvlyang-models/sonic-telemetry.yang',
+                         './cvlyang-models/sonic-telemetry_client.yang',
                          './cvlyang-models/sonic-gnmi.yang',
                          './cvlyang-models/sonic-types.yang',
                          './cvlyang-models/sonic-versions.yang',

src/sonic-yang-models/tests/files/sample_config_db.json

@@ -1177,6 +1177,24 @@
                 "port": "50051"
             }
         },
+        "TELEMETRY_CLIENT": {
+            "Global": {
+                "encoding": "JSON_IETF",
+                "retry_interval": "30",
+                "src_ip": "30.57.185.38",
+                "unidirectional": "true"
+            },
+            "DestinationGroup_HS": {
+                "dst_addr": "30.57.186.214:8081,30.57.185.39:8081"
+            },
+            "Subscription_HS_RDMA": {
+                "dst_group": "HS",
+                "path_target": "COUNTERS_DB",
+                "paths": "COUNTERS/Ethernet*,COUNTERS_PORT_NAME_MAP",
+                "report_interval": "5000",
+                "report_type": "periodic"
+            }
+        },
         "GNMI": {
             "certs": {
                 "ca_crt": "/etc/sonic/credentials/dsmsroot.cer",

src/sonic-yang-models/tests/yang_model_tests/tests/telemetry_client.json

@@ -0,0 +1,23 @@
+{
+  "PASSED": {
+    "desc": "telemetry_client passed"
+  },
+  "INCORRECT_DST_GROUP": {
+    "desc": "INCORRECT DST_GROUP FIELD IN TELEMETRY_CLIENT TABLE.",
+    "eStrKey" : "Must"
+  },
+  "SRC_IP_INCORRECT_FORMAT": {
+    "desc": "Add src ip which is not in correct ip-prefix format.",
+    "eStrKey" : "InvalidValue",
+    "eStr": ["src_ip"]
+  },
+  "ENCODING_WRONG_VALUE": {
+    "desc": "Configure wrong value for encoding.",
+    "eStrKey" : "InvalidValue",
+    "eStr": ["encoding"]
+  },
+  "DST_ADDR_INCORRECT_FORMAT": {
+    "desc": "Add dst_addr which is not in correct ip-port format.",
+    "eStrKey" : "Pattern"
+  }
+}

src/sonic-yang-models/tests/yang_model_tests/tests_config/telemetry_client.json

@@ -0,0 +1,142 @@
+{
+  "PASSED": {
+    "sonic-telemetry_client:sonic-telemetry_client": {
+      "sonic-telemetry_client:TELEMETRY_CLIENT": {
+        "Global": {
+          "encoding": "JSON_IETF",
+          "retry_interval": "30",
+          "src_ip": "30.57.185.38",
+          "unidirectional": "true"
+        },
+        "TELEMETRY_CLIENT_DS_LIST": [
+          {
+            "prefix": "DestinationGroup_HS",
+            "dst_addr": "30.57.186.214:8081,30.57.185.39:8081"
+          }
+        ],
+        "TELEMETRY_CLIENT_SUB_LIST": [
+          {
+            "prefix": "Subscription_HS_RDMA",
+            "dst_group": "HS",
+            "path_target": "COUNTERS_DB",
+            "paths": "COUNTERS/Ethernet*,COUNTERS_PORT_NAME_MAP",
+            "report_interval": "5000",
+            "report_type": "periodic"
+          }
+        ]
+      }
+    }
+  },
+  "INCORRECT_DST_GROUP": {
+    "sonic-telemetry_client:sonic-telemetry_client": {
+      "sonic-telemetry_client:TELEMETRY_CLIENT": {
+        "Global": {
+          "encoding": "JSON_IETF",
+          "retry_interval": "30",
+          "src_ip": "30.57.185.38",
+          "unidirectional": "true"
+        },
+        "TELEMETRY_CLIENT_DS_LIST": [
+          {
+            "prefix": "DestinationGroup_HS",
+            "dst_addr": "30.57.186.214:8081,30.57.185.39:8081"
+          }
+        ],
+        "TELEMETRY_CLIENT_SUB_LIST": [
+          {
+            "prefix": "Subscription_HS_RDMA",
+            "dst_group": "FS",
+            "path_target": "COUNTERS_DB",
+            "paths": "COUNTERS/Ethernet*,COUNTERS_PORT_NAME_MAP",
+            "report_interval": "5000",
+            "report_type": "periodic"
+          }
+        ]
+      }
+    }
+  },
+  "SRC_IP_INCORRECT_FORMAT": {
+    "sonic-telemetry_client:sonic-telemetry_client": {
+      "sonic-telemetry_client:TELEMETRY_CLIENT": {
+        "Global": {
+          "encoding": "JSON_IETF",
+          "retry_interval": "30",
+          "src_ip": "30.57.185.388",
+          "unidirectional": "true"
+        },
+        "TELEMETRY_CLIENT_DS_LIST": [
+          {
+            "prefix": "DestinationGroup_HS",
+            "dst_addr": "30.57.186.214:8081,30.57.185.39:8081"
+          }
+        ],
+        "TELEMETRY_CLIENT_SUB_LIST": [
+          {
+            "prefix": "Subscription_HS_RDMA",
+            "dst_group": "HS",
+            "path_target": "COUNTERS_DB",
+            "paths": "COUNTERS/Ethernet*,COUNTERS_PORT_NAME_MAP",
+            "report_interval": "5000",
+            "report_type": "periodic"
+          }
+        ]
+      }
+    }
+  },
+  "ENCODING_WRONG_VALUE": {
+    "sonic-telemetry_client:sonic-telemetry_client": {
+      "sonic-telemetry_client:TELEMETRY_CLIENT": {
+        "Global": {
+          "encoding": "Unicode",
+          "retry_interval": "30",
+          "src_ip": "30.57.185.38",
+          "unidirectional": "true"
+        },
+        "TELEMETRY_CLIENT_DS_LIST": [
+          {
+            "prefix": "DestinationGroup_HS",
+            "dst_addr": "30.57.186.214:8081,30.57.185.39:8081"
+          }
+        ],
+        "TELEMETRY_CLIENT_SUB_LIST": [
+          {
+            "prefix": "Subscription_HS_RDMA",
+            "dst_group": "HS",
+            "path_target": "COUNTERS_DB",
+            "paths": "COUNTERS/Ethernet*,COUNTERS_PORT_NAME_MAP",
+            "report_interval": "5000",
+            "report_type": "periodic"
+          }
+        ]
+      }
+    }
+  },
+  "DST_ADDR_INCORRECT_FORMAT": {
+    "sonic-telemetry_client:sonic-telemetry_client": {
+      "sonic-telemetry_client:TELEMETRY_CLIENT": {
+        "Global": {
+          "encoding": "JSON_IETF",
+          "retry_interval": "30",
+          "src_ip": "30.57.185.38",
+          "unidirectional": "true"
+        },
+        "TELEMETRY_CLIENT_DS_LIST": [
+          {
+            "prefix": "DestinationGroup_HS",
+            "dst_addr": "30.57.186.214:80819,30.57.185.39:8081"
+          }
+        ],
+        "TELEMETRY_CLIENT_SUB_LIST": [
+          {
+            "prefix": "Subscription_HS_RDMA",
+            "dst_group": "HS",
+            "path_target": "COUNTERS_DB",
+            "paths": "COUNTERS/Ethernet*,COUNTERS_PORT_NAME_MAP",
+            "report_interval": "5000",
+            "report_type": "periodic"
+          }
+        ]
+      }
+    }
+  }
+}

src/sonic-yang-models/yang-models/sonic-telemetry_client.yang

@@ -0,0 +1,140 @@
+module sonic-telemetry_client {
+
+    yang-version 1.1;
+
+    namespace "http://github.com/sonic-net/sonic-telemetry_client";
+    prefix telemetry_client;
+
+    import ietf-inet-types {
+        prefix inet;
+    }
+
+    import sonic-types {
+        prefix stypes;
+    }
+
+    organization
+        "SONiC";
+
+    contact
+        "SONiC";
+
+    description
+        "TELEMETRY_CLIENT yang Module for SONiC OS";
+
+    revision 2023-01-12 {
+        description
+            "First revision";
+    }
+
+    typedef report-type {
+        type enumeration {
+            enum periodic;
+            enum stream;
+            enum once;
+        }
+    }
+    typedef path_target {
+        type enumeration {
+            enum APPL_DB;
+            enum CONFIG_DB;
+            enum COUNTERS_DB;
+            enum STATE_DB;
+            enum OTHERS;
+        }
+    }
+
+    typedef encoding {
+        type enumeration {
+            enum JSON_IETF;
+            enum ASCII;
+            enum BYTES;
+            enum PROTO;
+        }
+    }
+
+    typedef ipv4-port {
+        type string {
+            pattern
+                '((([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}'
+            +  '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]):'
+            +  '([0-9]|[1-9]\d{1,3}|[1-5]\d{1,4}|6[0-4]\d{1,3}|65[0-4]\d{1,2}|655[0-2][0-9]|6553[0-5]),?)+';
+        }
+      }
+
+
+    container sonic-telemetry_client{
+
+        container TELEMETRY_CLIENT {
+            container Global {
+                leaf retry_interval {
+                    type uint64;
+                    description "retry_interval unit s";
+                }
+
+                leaf src_ip {
+                    type inet:ip-address;
+                }
+
+                leaf encoding {
+                    type encoding;
+                }
+
+                leaf unidirectional {
+                    type boolean;
+                    default true;
+                }
+            }
+
+            list TELEMETRY_CLIENT_DS_LIST {
+                ordered-by user;
+                key "prefix";
+
+                leaf prefix {
+                    type string {
+                        pattern "DestinationGroup_" + ".*";
+                    }
+                }
+
+                leaf dst_addr {
+                    type ipv4-port;
+                }
+            }
+
+            list TELEMETRY_CLIENT_SUB_LIST {
+                ordered-by user;
+                key "prefix";
+
+                leaf prefix {
+                    type string {
+                        pattern "Subscription_" + ".*";
+                    }
+                }
+
+                leaf dst_group {
+                    must "(contains(../../TELEMETRY_CLIENT_DS_LIST/prefix, current()))";
+                    type string;
+                }
+
+                leaf path_target {
+                    type path_target;
+                }
+
+                leaf paths {
+                    type string;
+                }
+
+                leaf report_interval {
+                    type uint64;
+                    description "report_interval unit ms";
+                    default 5000;
+                }
+
+                leaf report_type {
+                    type report-type;
+                }
+            }
+        }
+    }
+}
+