module clixon-lib {
    yang-version 1.1;
    namespace "http://clicon.org/lib";
    prefix cl;

    import ietf-yang-types {
        prefix yang;
    }
    import ietf-netconf-monitoring {
        prefix ncm;
    }
    import ietf-yang-metadata {
        prefix "md";
    }
    organization
        "Clicon / Clixon";

    contact
        "Olof Hagsand <olof@hagsand.se>";

    description
        "***** BEGIN LICENSE BLOCK *****
       Copyright (C) 2009-2019 Olof Hagsand
       Copyright (C) 2020-2022 Olof Hagsand and Rubicon Communications, LLC(Netgate)
       
       This file is part of CLIXON

       Licensed under the Apache License, Version 2.0 (the \"License\");
       you may not use this file except in compliance with the License.
       You may obtain a copy of the License at
            http://www.apache.org/licenses/LICENSE-2.0
       Unless required by applicable law or agreed to in writing, software
       distributed under the License is distributed on an \"AS IS\" BASIS,
       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
       See the License for the specific language governing permissions and
       limitations under the License.

       Alternatively, the contents of this file may be used under the terms of
       the GNU General Public License Version 3 or later (the \"GPL\"),
       in which case the provisions of the GPL are applicable instead
       of those above. If you wish to allow use of your version of this file only
       under the terms of the GPL, and not to allow others to
       use your version of this file under the terms of Apache License version 2, 
       indicate your decision by deleting the provisions above and replace them with
       the notice and other provisions required by the GPL. If you do not delete
       the provisions above, a recipient may use your version of this file under
       the terms of any one of the Apache License version 2 or the GPL.

       ***** END LICENSE BLOCK *****

       Clixon Netconf extensions for communication between clients and backend.
       This scheme adds:
       - Added values of RFC6022 transport identityref 
       - RPCs for debug, stats and process-control
       - Informal description of attributes

       Clixon also extends NETCONF for internal use with some internal attributes. These
       are not visible for external usage bit belongs to the namespace of this YANG.
       The internal attributes are:
       - content (also RESTCONF)
       - depth   (also RESTCONF)
       - username
       - autocommit
       - copystartup
       - transport (see RFC6022)
       - source-host (see RFC6022)
       - objectcreate
       - objectexisted
       - link # For split multiple XML files
      ";

    revision 2024-04-01 {
        description
            "Added: debug bits type
             Added: xmldb-split extension
             Added: Default format
             Released in Clixon 7.1";
    }
    revision 2024-01-01 {
        description
            "Removed container creators from 6.5
             Released in 7.0";
    }
    revision 2023-11-01 {
        description
            "Added ignore-compare extension
             Added creator meta configuration
             Removed obsolete extension autocli-op
             Released in 6.5.0";
    }
    revision 2023-05-01 {
        description
            "Restructured and extended stats rpc to schema mountpoints
             Moved datastore-format typedef from clixon-config
            ";
    }
    revision 2023-03-01 {
        description
            "Added creator meta-object";
    }
    revision 2022-12-01 {
        description
            "Added values of RFC6022 transport identityref 
             Added description of internal netconf attributes";
    }
    revision 2021-12-05 {
        description
            "Obsoleted: extension autocli-op";
    }
    revision 2021-11-11 {
        description
            "Changed: RPC stats extended with YANG stats";
    }
    revision 2021-03-08 {
        description
            "Changed: RPC process-control output to choice dependent on operation";
    }
    revision 2020-12-30 {
        description
            "Changed: RPC process-control output parameter status to pid";
    }
    revision 2020-12-08 {
        description
            "Added: autocli-op extension.
                    rpc process-control for process/daemon management
             Released in clixon 4.9";
    }
    revision 2020-04-23 {
        description
            "Added: stats RPC for clixon XML and memory statistics.
             Added: restart-plugin RPC for restarting individual plugins without restarting backend.";
    }
    revision 2019-08-13 {
        description
            "No changes (reverted change)";
    }
    revision 2019-06-05 {
        description
            "ping rpc added for liveness";
    }
    revision 2019-01-02 {
        description
            "Released in Clixon 3.9";
    }
    typedef service-operation {
        type enumeration {
            enum start {
                description
                "Start if not already running";
            }
            enum stop {
                description
                "Stop if running";
            }
            enum restart {
                description
                "Stop if running, then start";
            }
            enum status {
                description
                    "Check status";
            }
        }
        description
            "Common operations that can be performed on a service";
    }
    typedef datastore_format{
        description
            "Datastore format (only xml and json implemented in actual data.";
        type enumeration{
            enum xml{
                description
                "Save and load xmldb as XML
                 More specifically, such a file looks like: <config>...</config> provided
                 DATASTORE_TOP_SYMBOL is 'config'";
            }
            enum json{
                description "Save and load xmldb as JSON";
            }
            enum text{
                description "'Curly' C-like text format";
            }
            enum cli{
                description "CLI format";
            }
            enum default{
                description "Default format";
            }
        }
    }
    typedef clixon_debug_t {
        description
            "Debug flags.
             Flags are seperated into subject areas and detail
             Can also be given directly as -D <flag> to clixon commands
             Note there are also constants in the code that need to be in sync with these values";
         type bits {
            /* Subjects: */
            bit default {
                description "Default logs";
                position 0;
            }
            bit msg {
                description "In/out messages";
                position 1;
            }
            bit init {
                description "Initialization";
                position 2;
            }
            bit xml {
                description "XML processing";
                position 3;
            }
            bit xpath {
                description "XPath processing";
                position 4;
            }
            bit yang {
                description "YANG processing";
                position 5;
            }
            bit backend {
                description "Backend-specific";
                position 6;
            }
            bit cli {
                description "CLI frontend";
                position 7;
            }
            bit netconf {
                description "NETCONF frontend";
                position 8;
            }
            bit restconf {
                description "RESTCONF frontend";
                position 9;
            }
            bit snmp {
                description "SNMP frontend";
                position 10;
            }
            bit nacm {
                description "NACM processing";
                position 11;
            }
            bit proc {
                description "Process handling";
                position 12;
            }
            bit datastore {
                description "Datastore xmldb management";
                position 13;
            }
            bit event {
                description "Event processing";
                position 14;
            }
            bit rpc {
                description "RPC handling";
                position 15;
            }
            bit stream {
                description "Notification streams";
                position 16;
            }
            bit parse {
                description "Parser: XML,YANG, etc";
                position 17;
            }
            bit app {
                description "External applications";
                position 20;
            }
            bit app2 {
                description "External application";
                position 21;
            }
            bit app3 {
                description "External application 2";
                position 22;
            }
            /* Detail level: */
            bit detail {
                description "Details: traces, parse trees, etc";
                position 24;
            }
            bit detail2 {
                description "Extra details";
                position 25;
            }
            bit detail3 {
                description "Probably more detail than you want";
                position 26;
            }
        }
    }
    identity snmp {
        description
            "SNMP";
        base ncm:transport;
    }
    identity netconf {
        description
            "Just NETCONF without specific underlying transport, 
             Clixon uses stdio for its netconf client and therefore does not know whether it is
             invoked in a script, by a NETCONF/SSH subsystem, etc";
        base ncm:transport;
    }
    identity restconf {
        description
            "RESTCONF either as HTTP/1 or /2, TLS or not, reverse proxy (eg fcgi/nginx) or native";
        base ncm:transport;
    }
    identity cli {
        description
            "A CLI session";
        base ncm:transport;
    }
    extension ignore-compare {
        description
            "The object should be ignored when comparing device configs for equality.
             The object should never be added, modified, or deleted on target.
             Essentially a read-only object
             One example is auto-created objects by the controller, such as uid.";
    }
    extension xmldb-split {
        description
            "When split configuration stores are used, ie CLICON_XMLDB_MULTI is set,
             This extension marks where in the configuration tree, one file terminates
             and a new sub-file is written. 
             A designer adds the 'xmldb-split' extension to a YANG node which should be split.
             For example, a split could be made at mountpoints.
             See also the 'link 'attribute.
             ";
    }
    md:annotation creator {
        type string;
        description
            "This annotation contains the name of a creator of an object.
             One application is the clixon controller where multiple services can
             create the same object. When such a service is deleted (or changed) one needs to keep
             track of which service created what.
             Limitations: only objects that are actually added or deleted. 
             A sub-object will not be noted";
    }
    rpc debug {
        description
            "Set debug flags of backend.
             Note only numerical values";
        input {
            leaf level {
                type uint32;
            }
        }
    }
    rpc ping {
        description "Check aliveness of backend daemon.";
    }
    rpc stats { /* Could be moved to state */
        description "Clixon yang and datastore statistics.";
        input {
            leaf modules {
                description "If enabled include per-module statistics";
                type boolean;
                mandatory false;
            }
        }
        output {
            container global{
                description
                    "Clixon global statistics. 
                     These are global counters incremented by new() and decreased by free() calls.
                     This number is higher than the sum of all datastore/module residing objects, since
                     objects may be used for other purposes than datastore/modules";
                leaf xmlnr{
                    description
                        "Number of existing XML objects: number of residing xml/json objects
                         in the internal 'cxobj' representation.";
                    type uint64;
                }
                leaf yangnr{
                    description
                        "Number of resident YANG objects. ";
                    type uint64;
                }
            }
            container datastores{
                list datastore{
                    description "Per datastore statistics for cxobj";
                    key "name";
                    leaf name{
                        description "Name of datastore (eg running).";
                        type string;
                    }
                    leaf nr{
                        description "Number of XML objects. That is number of residing xml/json objects
                             in the internal 'cxobj' representation.";
                        type uint64;
                    }
                    leaf size{
                        description "Size in bytes of internal datastore cache of datastore tree.";
                        type uint64;
                    }
                }
            }
            container module-sets{
                list module-set{
                    description "Statistics per group of module, eg top-level and mount-points";
                    key "name";
                    leaf name{
                        description "Name of YANG module.";
                        type string;
                    }
                    leaf nr{
                        description
                            "Total number of YANG objects in set";
                        type uint64;
                    }
                    leaf size{
                        description
                            "Total size in bytes of internal YANG object representation for module set";
                        type uint64;
                    }
                    list module{
                        description "Statistics per module (if modules set in input)";
                        key "name";
                        leaf name{
                            description "Name of YANG module.";
                            type string;
                        }
                        leaf nr{
                            description
                                "Number of YANG objects. That is number of residing YANG objects";
                            type uint64;
                        }
                        leaf size{
                            description
                                "Size in bytes of internal YANG object representation.";
                            type uint64;
                        }
                    }
                }
            }
        }
    }
    rpc restart-plugin {
        description "Restart specific backend plugins.";
        input {
            leaf-list plugin {
                description "Name of plugin to restart";
                type string;
            }
        }
    }
    rpc process-control {
        description
            "Control a specific process or daemon: start/stop, etc.
             This is for direct managing of a process by the backend. 
             Alternatively one can manage a daemon via systemd, containerd, kubernetes, etc.";
        input {
            leaf name {
                description "Name of process";
                type string;
                mandatory true;
            }
            leaf operation {
                type service-operation;
                mandatory true;
                description
                    "One of the strings 'start', 'stop', 'restart', or 'status'.";
            }
        }
        output {
            choice result {
                case status {
                    description
                        "Output from status rpc";
                    leaf active {
                        description
                            "True if process is running, false if not. 
                             More specifically, there is a process-id and it exists (in Linux: kill(pid,0).
                             Note that this is actual state and status is administrative state,
                             which means that changing the administrative state, eg stopped->running
                             may not immediately switch active to true.";
                        type boolean;
                    }
                    leaf description {
                        type string;
                        description "Description of process. This is a static string";
                    }
                    leaf command {
                        type string;
                        description "Start command with arguments";
                    }
                    leaf status {
                        description
                            "Administrative status (except on external kill where it enters stopped
                             directly from running):
                             stopped: pid=0,   No process running
                             running: pid set, Process started and believed to be running
                             exiting: pid set, Process is killed by parent but not waited for";
                        type string;
                    }
                    leaf starttime {
                        description "Time of starting process UTC";
                        type yang:date-and-time;
                    }
                    leaf pid {
                        description "Process-id of main running process (if active)";
                        type uint32;
                    }
                }
                case other {
                    description
                        "Output from start/stop/restart rpc";
                    leaf ok {
                        type empty;
                    }
                }
            }
        }
    }
}
