local kube = import "../../../kube/hscloud.libsonnet";

{
    // Global sets up a global tier instance of the hscloud monitoring infrastructure.
    //
    // This currently consists of Victoria Metrics, to which the agent tier sends metrics data via
    // the prometheus remote_write protocol.
    // Victoria Metrics is here used as a long-term storage solution. However, right now, it
    // just keeps data locally on disk. In the future, S3 snapshots/backups should be introduced.
    Global(name):: {
        local global = self,
        local cfg = global.cfg,

        cfg:: {
            name: name,
            namespace: "monitoring-global-%s" % [cfg.name],

            images: {
                victoria: "victoriametrics/victoria-metrics:v1.40.0",
                vmauth: "victoriametrics/vmauth:v1.40.0",
                grafana: "grafana/grafana:7.2.1",
            },

            hosts: {
                // DNS hostname that this global tier will use. Ingress will run under it.
                globalAPI: error "hosts.globalAPI must be set",
                globalDashboard: error "hosts.globalDashboard must be set",
            },

            storageClasses: {
                // Storage class used for main data retention.
                victoria: error "storageClasses.victoria must be set",
            },

            oauth: {
                clientId: error "oauth.clientId must be set",
                clientSecret: error "oauth.clientSecret must be set",
            },

            // A list of agents that will push metrics to this instance.
            // List of:
            // {
            //   username: the username that the agent will authenticate with
            //   password: the password that the agent will authenticate with
            // }
            agents: [],
        },

        // Generated URLs that agents should use to ship metrics over. Both require HTTP basic
        // auth, configured via cfg.agents.
        // The internal URL that should be used for agents colocated in the same Kubernetes cluster.
        internalIngestURL:: "http://%s/api/v1/write" % [global.victoria.serviceAPI.host_colon_port],
        // The internal URL that should be used for readers colocated in the same Kubernetes cluster.
        internalReadURL:: "http://%s/" % [global.victoria.serviceAPI.host_colon_port],
        // The global URL that should be used for agents sending data over the internet.
        globalIngestURL:: "https://%s/api/v1/write" % [cfg.hosts.globalAPI],
        // The global URL that should be used for readers over the internet.
        globalReadURL:: "https://%s" % [cfg.hosts.globalAPI],

        namespace: kube.Namespace(cfg.namespace),
        local ns = global.namespace,

        victoria: {
            local victoria = self,

            pvc: ns.Contain(kube.PersistentVolumeClaim("victoria-data")) {
                storage: "64Gi",
                storageClass: cfg.storageClasses.victoria,
            },

            authSecret: ns.Contain(kube.Secret("vmauth")) {
                data+: {
                    "config.yaml": std.base64(std.manifestJson({
                        users: [
                            {
                                username: a.username,
                                password: a.password,
                                url_prefix: "http://localhost:8428",
                            }
                            for a in (cfg.agents + [cfg.loopbackGrafanaUser])
                        ],
                    }) + "\n")
                },
            },

            deploy: ns.Contain(kube.Deployment("victoria")) {
                spec+: {
                    template+: {
                        spec+: {
                            containers_: {
                                default: kube.Container("default") {
                                    image: cfg.images.victoria,
                                    volumeMounts_: {
                                        data: { mountPath: "/victoria-metrics-data", },
                                    },
                                },
                                vmauth: kube.Container("vmauth") {
                                    image: cfg.images.vmauth,
                                    command: [
                                        "/vmauth-prod",
                                        "-auth.config", "/mnt/secret/config.yaml",
                                    ],
                                    volumeMounts_: {
                                        secret: { mountPath: "/mnt/secret", },
                                    },
                                    ports_: {
                                        api: { containerPort: 8427 }
                                    },
                                }
                            },
                            volumes_: {
                                data: kube.PersistentVolumeClaimVolume(victoria.pvc),
                                secret: kube.SecretVolume(victoria.authSecret),
                            },
                        },
                    },
                },
            },

            serviceAPI: ns.Contain(kube.Service("victoria-api")) {
                target_pod: victoria.deploy.spec.template,
                spec+: {
                    ports: [
                        { name: "api", port: 8427, targetPort: 8427, protocol: "TCP" },
                    ],
                    type: "ClusterIP",
                },
            },

            ingressAPI: ns.Contain(kube.SimpleIngress("victoria-api")) {
                hosts:: [cfg.hosts.globalAPI],
                target_service:: victoria.serviceAPI,
            },
        },

        grafana: {
            local grafana = self,

            // grafana.ini, serialized to secret.
            ini:: {
                sections: {
                    "auth": {
                        "disable_login_form": true,
                        "oauth_auto_login": true,
                    },
                    "security": {
                        # We do not disable basic auth, as we want to use builtin
                        # users as API users (eg for config reload), but we want
                        # to disable the default admin:admin user.
                        "disable_initial_admin_creation": true,
                    },
                    "auth.generic_oauth": {
                        enabled: true,
                        client_id: cfg.oauth.clientId,
                        client_secret: cfg.oauth.clientSecret,
                        auth_url: "https://sso.hackerspace.pl/oauth/authorize",
                        token_url: "https://sso.hackerspace.pl/oauth/token",
                        api_url: "https://sso.hackerspace.pl/api/1/userinfo",
                        scopes: "openid",
                        email_attribute_path: "email",
                        allow_sign_up: true,
                        role_attribute_path: "contains(groups, 'grafana-admin')",
                    },
                    "server": {
                        domain: cfg.hosts.globalDashboard,
                        root_url: "https://%s/" % [ cfg.hosts.globalDashboard ],
                    },
                },
            },

            datasources:: {
                apiVersion: 1,
                datasources: [
                    {
                        name: "victoria-global",
                        type: "prometheus",
                        uid: "victoria-global",
                        isDefault: true,
                        url: global.internalReadURL,
                        basicAuth: true,
                        basicAuthUser: cfg.loopbackGrafanaUser.username,
                        secureJsonData: {
                            basicAuthPassword: cfg.loopbackGrafanaUser.password,
                        },
                    },
                ],
            },

            config: ns.Contain(kube.Secret("grafana-config")) {
                data+: {
                    "grafana.ini": std.base64(std.manifestIni(grafana.ini)),
                    "datasources.yaml": std.base64(std.manifestYamlDoc(grafana.datasources)),
                },
            },

            pvc: ns.Contain(kube.PersistentVolumeClaim("grafana-data")) {
                storage: "8Gi",
                spec+: {
                    storageClassName: cfg.storageClasses.grafana,
                },
            },

            deploy: ns.Contain(kube.Deployment("grafana")) {
                spec+: {
                    template+: {
                        spec+: {
                            containers_: {
                                default: kube.Container("default") {
                                    image: cfg.images.grafana,
                                    ports_: {
                                        public: { containerPort: 3000 },
                                    },
                                    env_: {
                                        GF_PATHS_CONFIG: "/etc/hscloud-config/grafana.ini",
                                        GF_PATHS_PROVISIONING: "/etc/hscloud-config/provisioning",
                                        GF_PATHS_DATA: "/var/lib/grafana",
                                    },
                                    volumeMounts_: {
                                        config: { mountPath: "/etc/hscloud-config", },
                                        data: { mountPath: "/var/lib/grafana", },
                                    },
                                    resources: {
                                        requests: { cpu: "100m", memory: "256M", },
                                        limits: { cpu: "200m", memory: "512M", },
                                    },
                                },
                            },
                            volumes_: {
                                data: kube.PersistentVolumeClaimVolume(grafana.pvc),
                                config: kube.SecretVolume(grafana.config) {
                                    secret+: {
                                        items: [
                                            { key: "grafana.ini", path: "grafana.ini", },
                                            { key: "datasources.yaml", path: "provisioning/datasources/datasources.yaml", },
                                        ],
                                    },
                                },
                            },
                        },
                    },
                },
            },

            service: ns.Contain(kube.Service("grafana-public")) {
                target_pod: grafana.deploy.spec.template,
                spec+: {
                    ports: [
                        { name: "public", port: 3000, targetPort: 3000, protocol: "TCP" },
                    ],
                },
            },

            ingress: ns.Contain(kube.SimpleIngress("grafana-public")) {
                hosts:: [cfg.hosts.globalDashboard],
                target_service:: grafana.service,
            },
        },
    }
}