Add YANG model and unit tests for sonic-telemetry (#10840)

- Why I did it

YANG schema is missing for sonic-telemetry

- How I did it

Added YANG schema to sonic-yang-models and appropriate unit tests inside of test and test_config

- How to verify it

Build sonic-yang-models python wheels target and verify that unit tests are passing

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

@@ -45,6 +45,7 @@ Table of Contents
          * [Tacplus Server](#tacplus-server)    
          * [TC to Priority group map](#tc-to-priority-group-map)  
          * [TC to Queue map](#tc-to-queue-map)    
+         * [Telemetry](#telemetry)  
          * [Versions](#versions)  
          * [VLAN](#vlan)   
          * [VLAN_MEMBER](#vlan_member)  
@@ -1355,6 +1356,25 @@ name as object key and member list as attribute.
 }  
 ```
 
+### Telemetry
+
+```
+{
+    "TELEMETRY": {
+        "certs": {
+            "ca_crt": "/etc/sonic/telemetry/dsmsroot.cer",
+            "server_crt": "/etc/sonic/telemetry/streamingtelemetryserver.cer",
+            "server_key": "/etc/sonic/telemetry/streamingtelemetryserver.key"
+        },
+        "gnmi": {
+            "client_auth": "true",
+            "log_level": "2",
+            "port": "50051"
+        }
+    }
+}
+```
+
 ### Versions
 
 This table is where the curret version of the software is recorded.

src/sonic-yang-models/setup.py

@@ -126,6 +126,7 @@ setup(
                          './yang-models/sonic-syslog.yang',
                          './yang-models/sonic-system-aaa.yang',
                          './yang-models/sonic-system-tacacs.yang',
+                         './yang-models/sonic-telemetry.yang',
                          './yang-models/sonic-types.yang',
                          './yang-models/sonic-versions.yang',
                          './yang-models/sonic-vlan.yang',
@@ -184,6 +185,7 @@ setup(
                          './cvlyang-models/sonic-sflow.yang',
                          './cvlyang-models/sonic-system-aaa.yang',
                          './cvlyang-models/sonic-system-tacacs.yang',
+                         './cvlyang-models/sonic-telemetry.yang',
                          './cvlyang-models/sonic-types.yang',
                          './cvlyang-models/sonic-versions.yang',
                          './cvlyang-models/sonic-vlan.yang',

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

@@ -1045,6 +1045,18 @@
                 "VERSION": "version_1_0_3"
             }
         },
+        "TELEMETRY": {
+            "certs": {
+                "ca_crt": "/etc/sonic/telemetry/dsmsroot.cer",
+		"server_crt": "/etc/sonic/telemetry/streamingtelemetryserver.cer",
+		"server_key": "/etc/sonic/telemetry/streamingtelemetryserver.key"
+            },
+	    "gnmi": {
+		"client_auth": "true",
+		"log_level": "2",
+		"port": "50051"
+	    }
+        },
         "FLEX_COUNTER_TABLE": {
             "PFCWD": {
                 "FLEX_COUNTER_STATUS": "enable"

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

@@ -0,0 +1,17 @@
+{
+    "TELEMETRY_TABLE_WITH_INCORRECT_CERT": {
+        "desc": "TABLE_WITH_INCORRECT_CERT failure.",
+        "eStrKey": "Pattern"
+    },
+    "TELEMETRY_TABLE_WITH_INCORRECT_CLIENT_AUTH": {
+        "desc": "TABLE_WITH_INCORRECT_CLIENT_AUTH failure",
+        "eStrKey": "InvalidValue"
+    },
+    "TELEMETRY_TABLE_WITH_INCORRECT_PORT": {
+        "desc": "TABLE_WITH_INCORRECT_PORT failure.",
+        "eStrKey": "InvalidValue"
+    },
+    "TELEMETRY_TABLE_WITH_VALID_CONFIG": {
+        "desc": "TABLE WITH VALID CONFIG."
+    }
+}

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

@@ -0,0 +1,66 @@
+{
+    "TELEMETRY_TABLE_WITH_INCORRECT_CERT": {
+        "sonic-telemetry:sonic-telemetry": {
+            "sonic-telemetry:TELEMETRY": {
+                "certs": {
+                    "ca_crt": "abcd.config",
+                    "server_crt": "a/b/c",
+                    "server_key": "123"
+                },
+                "gnmi": {
+                    "client_auth": "true",
+                    "log_level": "2",
+                    "port": "50051"
+                }
+            }
+        }
+    },
+    "TELEMETRY_TABLE_WITH_INCORRECT_CLIENT_AUTH": {
+        "sonic-telemetry:sonic-telemetry": {
+            "sonic-telemetry:TELEMETRY": {
+                "certs": {
+                    "ca_crt": "/etc/sonic/telemetry/dsmsroot.cer",
+                    "server_crt": "/etc/sonic/telemetry/streamingtelemetryserver.cer",
+                    "server_key": "/etc/sonic/telemetry/streamingtelemetryserver.key"
+                },
+                "gnmi": {
+                    "client_auth": "up",
+                    "log_level": "2",
+                    "port": "50051"
+                }
+            }
+        }
+    },
+    "TELEMETRY_TABLE_WITH_INCORRECT_PORT": {
+        "sonic-telemetry:sonic-telemetry": {
+            "sonic-telemetry:TELEMETRY": {
+                "certs": {
+                    "ca_crt": "/etc/sonic/telemetry/dsmsroot.cer",
+                    "server_crt": "/etc/sonic/telemetry/streamingtelemetryserver.cer",
+                    "server_key": "/etc/sonic/telemetry/streamingtelemetryserver.key"
+                },
+                "gnmi": {
+                    "client_auth": "true",
+                    "log_level": "2",
+                    "port": "abc"
+                }
+            }
+        }
+    },
+    "TELEMETRY_TABLE_WITH_VALID_CONFIG": {
+        "sonic-telemetry:sonic-telemetry": {
+            "sonic-telemetry:TELEMETRY": {
+                "certs": {
+                    "ca_crt": "/etc/sonic/telemetry/dsmsroot.cer",
+                    "server_crt": "/etc/sonic/telemetry/streamingtelemetryserver.cer",
+                    "server_key": "/etc/sonic/telemetry/streamingtelemetryserver.key"
+                },
+                "gnmi": {
+                    "client_auth": "true",
+                    "log_level": "2",
+                    "port": "50051"
+                }
+            }
+        }
+    }
+}

src/sonic-yang-models/yang-models/sonic-telemetry.yang

@@ -0,0 +1,78 @@
+module sonic-telemetry {
+
+    yang-version 1.1;
+
+    namespace "http://github.com/Azure/sonic-telemetry";
+    prefix telemetry;
+
+    import ietf-inet-types {
+        prefix inet;
+    }
+
+    organization
+        "SONiC";
+
+    contact
+        "SONiC";
+
+    description "TELEMETRY YANG Module for SONiC OS";
+
+    revision 2022-05-13 {
+        description "First Revision";
+    }
+
+    container sonic-telemetry {
+
+        container TELEMETRY {
+
+            description "TELEMETRY TABLE part of config_db.json";
+
+            container certs {
+
+                leaf ca_crt {
+                    type string {
+                        pattern '(/[a-zA-Z0-9_-]+)*/([a-zA-Z0-9_-]+).cer';
+                    }
+                    description "Local path for ca_crt.";
+                }
+
+                leaf server_crt {
+                    type string {
+                        pattern '(/[a-zA-Z0-9_-]+)*/([a-zA-Z0-9_-]+).cer';
+                    }
+                    description "Local path for server_crt.";
+                }
+
+                leaf server_key {
+                    type string {
+                        pattern '(/[a-zA-Z0-9_-]+)*/([a-zA-Z0-9_-]+).key';
+                    }
+                    description "Local path for server_key.";
+                }
+
+            }
+
+            container gnmi {
+
+                leaf client_auth {
+                    type boolean;
+                    description "Flag for requiring client auth.";
+                }
+
+                leaf log_level {
+                    type uint8 {
+                        range 0..100;
+                    }
+                    description "Log level for gnmi.";
+                }
+
+                leaf port {
+                    type inet:port-number;
+                    description "Port gnmi runs on.";
+                }
+
+            }
+
+        }
+    }
+}