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// This is a jsonnet file, it generates kubernetes manifests.
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// To generate and apply, run "jsonnet k8s.jsonnet | kubectl apply -f -"
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// Note this file is only set up to generate manifests for a basic replication node,
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// for the sake of simplicity.
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{
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kind: "List",
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apiVersion: "v1",
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config:: {
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// These are the important top-level settings.
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// Change these to configure the services.
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// Image tag (application version) to use.
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// Note: "latest" is not recommended in production, as you can't be sure what version
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// you're actually running, and must manually re-pull to get an updated copy.
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image_tag: "latest",
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// Twitch channels to capture.
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// Channels suffixed with a '!' are considered "important" and will be retried more aggressively
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// and warned about if they're not currently streaming.
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channels: ["desertbus!", "db_chief", "db_high", "db_audio", "db_bus"],
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// Stream qualities to capture
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qualities: ["source", "480p"],
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// The node selector and hostPath to use. All pods must be on the same host
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// and use this hostpath in order to share the disk.
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node_selector: {},
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host_path: "/var/lib/wubloader",
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// The local port within each container to bind the backdoor server on.
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// You can exec into the container and telnet to this port to get a python shell.
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backdoor_port: 1234,
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// Other nodes to always backfill from. You should not include the local node.
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// If you are using the database to find peers, you should leave this empty.
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peers: [
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],
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// This node's name in the nodes table of the database
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localhost: "node_name",
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// The hostname to use in the Ingress
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ingress_host: "wubloader.example.com",
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// Set to true to let the ingress handle TLS
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ingress_tls: true,
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// Uncomment and give a secretName for ingress, if required for ingress TLS
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//ingress_secret_name: "wubloader-tls",
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// Additional metadata labels for Ingress (cert-manager, etc.) - adjust as needed for your setup
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ingress_labels: {},
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// Connection args for the database.
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// If database is defined in this config, host and port should be postgres:5432.
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db_args: {
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user: "vst",
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password: "dbfh2019", // don't use default in production. Must not contain ' or \ as these are not escaped.
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host: "postgres",
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port: 5432,
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dbname: "wubloader",
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},
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// The timestamp corresponding to 00:00 in bustime
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bustime_start: "1970-01-01T00:00:00Z",
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// Extra options to pass via environment variables,
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// eg. log level, disabling stack sampling.
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env: {
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// Uncomment this to set log level to debug
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// WUBLOADER_LOG_LEVEL: "DEBUG",
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// Uncomment this to disable stacksampling performance monitoring
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// WUBLOADER_DISABLE_STACKSAMPLER: "true",
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},
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},
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// A few derived values.
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// The connection string for the database. Constructed from db_args.
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db_connect:: std.join(" ", [
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"%s='%s'" % [key, $.config.db_args[key]]
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for key in std.objectFields($.config.db_args)
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]),
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// Cleaned up version of $.channels without importance markers
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clean_channels:: [std.split(c, '!')[0] for c in $.config.channels],
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// k8s-formatted version of env dict
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env_list:: [
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{name: key, value: $.config.env[key]}
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for key in std.objectFields($.config.env)
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],
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// This function generates deployments for each service, since they only differ slightly,
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// with only a different image, CLI args and possibly env vars.
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// The image name is derived from the component name
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// (eg. "downloader" is quay.io/ekimekim/wubloader-downloader)
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// so we only pass in name, args and env vars (with the latter two optional).
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// Optional kwargs work just like python.
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deployment(name, args=[], env=[]):: {
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kind: "Deployment",
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apiVersion: "apps/v1",
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metadata: {
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name: "wubloader-%s" % name,
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labels: {app: "wubloader", component: name},
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},
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spec: {
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replicas: 1,
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selector: {
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matchLabels: {app: "wubloader", component: name},
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},
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template: {
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metadata: {
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labels: {app: "wubloader", component: name},
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},
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spec: {
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containers: [
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{
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name: name,
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// segment-coverage is called segment_coverage in the image, so replace - with _
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image: "quay.io/ekimekim/wubloader-%s:%s" % [std.strReplace(name, "-", "_"), $.config.image_tag],
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args: args,
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volumeMounts: [{name: "data", mountPath: "/mnt"}],
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env: $.env_list + env, // main env list combined with any deployment-specific ones
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},
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],
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volumes: [
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{
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name: "data",
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hostPath: {path: $.config.host_path},
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},
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],
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nodeSelector: $.config.node_selector,
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},
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},
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},
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},
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// This function generates a Service object for each service, since they're basically identical.
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service(name):: {
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kind: "Service",
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apiVersion: "v1",
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metadata: {
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name: "wubloader-%s" % name,
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labels: {app: "wubloader", component: name},
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},
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spec: {
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selector: {app: "wubloader", component: name},
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ports: [{name: "http", port: 80, targetPort: 80}],
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},
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},
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// The actual manifests.
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// These are all deployments. Note that all components work fine if multiple are running
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// (they may duplicate work, but not cause errors by stepping on each others' toes).
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items: [
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// The downloader watches the twitch stream and writes the HLS segments to disk
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$.deployment("downloader", args=$.config.channels + [
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"--base-dir", "/mnt",
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"--qualities", std.join(",", $.config.qualities),
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"--backdoor-port", std.toString($.config.backdoor_port),
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"--metrics-port", "80",
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]),
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// The restreamer is a http server that fields requests for checking what segments exist
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// and allows HLS streaming of segments from any requested timestamp
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$.deployment("restreamer", args=[
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"--base-dir", "/mnt",
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"--backdoor-port", std.toString($.config.backdoor_port),
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"--port", "80",
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]),
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// The backfiller periodically compares what segments exist locally to what exists on
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// other nodes. If it finds ones it doesn't have, it downloads them.
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// It can talk to the database to discover other wubloader nodes, or be given a static list.
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$.deployment("backfiller", args=$.clean_channels + [
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"--base-dir", "/mnt",
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"--qualities", std.join(",", $.config.qualities),
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"--static-nodes", std.join(",", $.config.peers),
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"--backdoor-port", std.toString($.config.backdoor_port),
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"--node-database", $.db_connect,
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"--localhost", $.config.localhost,
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"--metrics-port", "80",
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]),
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// Segment coverage is a monitoring helper that periodically scans available segments
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// and reports stats. It also creates a "coverage map" image to represent this info.
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// It puts this in the segment directory where nginx will serve it.
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$.deployment("segment-coverage", args=$.clean_channels + [
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"--base-dir", "/mnt",
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"--qualities", std.join(",", $.config.qualities),
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"--metrics-port", "80",
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]),
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// Normally nginx would be responsible for proxying requests to different services,
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// but in k8s we can use Ingress to do that. However nginx is still needed to serve
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// static content - segments as well as thrimbletrimmer.
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$.deployment("nginx", env=[
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{name: "THRIMBLETRIMMER", value: "true"},
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{name: "SEGMENTS", value: "/mnt"},
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]),
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// Services for all deployments
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$.service("downloader"),
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$.service("backfiller"),
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$.service("nginx"),
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$.service("restreamer"),
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$.service("segment-coverage"),
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// Ingress to direct requests to the correct services.
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{
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kind: "Ingress",
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apiVersion: "networking.k8s.io/v1beta1",
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metadata: {
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name: "wubloader",
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labels: {app: "wubloader"} + $.config.ingress_labels,
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},
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spec: {
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rules: [
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{
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host: $.config.ingress_host,
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http: {
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// Helper functions for defining the path rules below
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local rule(name, path, type) = {
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path: path,
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pathType: type,
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backend: {
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serviceName: "wubloader-%s" % name,
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servicePort: 80,
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},
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},
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local metric_rule(name) = rule(name, "/metrics/%s" % name, "Exact"),
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paths: [
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// Map /metrics/NAME to each service (except restreamer)
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metric_rule("downloader"),
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metric_rule("backfiller"),
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metric_rule("segment-coverage"),
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// Map /segments and /thrimbletrimmer to the static content nginx
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rule("nginx", "/segments", "Prefix"),
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rule("nginx", "/thrimbletrimmer", "Prefix"),
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// Map everything else to restreamer
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rule("restreamer", "/", "Prefix"),
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],
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},
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},
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],
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[if $.config.ingress_tls then 'tls']: [
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{
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hosts: [
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$.config.ingress_host,
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],
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[if "ingress_secret_name" in $.config then 'secretName']: $.config.ingress_secret_name,
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},
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],
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},
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},
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],
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}
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