x402: consolidate to a single shared forwardAuth gateway
The per-site `x402_instance` module created one Deployment + Service + PDB per protected host (9 in total, 9×64Mi). Every pod was running the exact same logic with the same config — the only thing that varied was the upstream URL, which we don't even need since the gateway can return 200 to "allow" and Traefik handles the upstream itself. Refactor to the same pattern as `ai-bot-block`: * single deployment + service in `traefik` namespace, 2 replicas, HA * Traefik `Middleware` CRD `x402` (forwardAuth → x402-gateway:8080/auth) * each consumer ingress just appends `traefik-x402@kubernetescrd` to its middleware chain via `extra_middlewares` x402-gateway gains a `MODE=forwardauth` env var that returns 200 (allow) or 402 (with x402 PaymentRequiredResponse body) instead of reverse- proxying. Image: ghcr ... f4804d62. Pod count: 9 → 2 (78% memory saved). All 9 sites verified still serving the Anubis challenge to plain curl with identical TTFB. DRY_RUN until `var.x402_wallet_address` is set on the traefik stack. Removes `modules/kubernetes/x402_instance/` (dead code now).
This commit is contained in:
Viktor Barzin
parent
ce4a75d79a
commit
753e9bb971
12 changed files with 269 additions and 419 deletions
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@ -1,297 +0,0 @@
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terraform {
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required_providers {
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kubernetes = {
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source = "hashicorp/kubernetes"
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}
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}
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}
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# Per-site x402 payment gateway. Sits in FRONT of Anubis:
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#
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# ingress -> x402-<name> Service:8080 -> x402 pod:8923 ->
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# anubis-<name> Service:8080 -> anubis pod -> backend
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#
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# Behaviour:
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# - X-PAYMENT header present → validate via Coinbase facilitator,
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# forward to Anubis on success, 402 on fail.
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# - User-Agent matches AI bot → return 402 with payment requirements.
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# - Everything else → forward transparently to Anubis (browsers
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# still solve the JS PoW gate as today).
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#
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# When `wallet_address` is empty, the gateway runs in DRY_RUN mode — every
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# request is forwarded transparently. This lets us drop the pod into the
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# request path without changing live behaviour while we wait for the
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# wallet to be configured. Flip live by setting `wallet_address`.
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variable "name" {
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type = string
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description = "Short logical name (e.g. \"blog\"). Used to derive Service/Deployment/Secret names as x402-<name>."
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}
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variable "namespace" {
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type = string
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description = "Namespace to deploy into — typically the same as the Anubis instance for the same backend."
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}
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variable "target_url" {
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type = string
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description = "Upstream URL the gateway forwards to. Usually the anubis-<name> Service's cluster DNS."
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}
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variable "wallet_address" {
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type = string
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default = ""
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description = "EVM wallet address (0x…) that receives USDC. Empty = DRY_RUN, no 402s issued."
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}
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variable "price_label" {
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type = string
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default = "$0.01"
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description = "Human-readable price displayed in payment requirements."
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}
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variable "price_usdc_micros" {
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type = number
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default = 10000
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description = "Price in USDC base units (6 decimals). Default 10_000 = $0.01."
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}
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variable "network" {
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type = string
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default = "base"
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description = "x402 network identifier. \"base\", \"base-sepolia\", or any custom paired with USDC_ASSET."
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}
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variable "facilitator_url" {
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type = string
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default = "https://x402.org/facilitator"
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description = "Coinbase / community facilitator endpoint that verifies and settles X-PAYMENT headers."
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}
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variable "image_tag" {
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type = string
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default = "ce333419"
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description = "forgejo.viktorbarzin.me/viktor/x402-gateway tag. Pin to a release SHA, never :latest."
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}
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variable "replicas" {
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type = number
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default = 1
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description = "Replica count. The gateway is stateless so >1 is fine, but 1 is enough for low-traffic sites."
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}
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variable "memory" {
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type = string
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default = "64Mi"
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description = "requests==limits memory. The Go binary idles at ~10MiB."
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}
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variable "cpu_request" {
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type = string
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default = "10m"
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description = "CPU request. Per-request work is just an HTTP call to the facilitator."
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}
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variable "bot_ua_regex" {
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type = string
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default = ""
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description = "Override for the AI-bot User-Agent regex. Empty = use the gateway's default (ClaudeBot|GPTBot|…)."
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}
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locals {
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full_name = "x402-${var.name}"
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labels = {
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"app" = local.full_name
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"app.kubernetes.io/name" = "x402-gateway"
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"app.kubernetes.io/instance" = local.full_name
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"app.kubernetes.io/component" = "payment-gateway"
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"app.kubernetes.io/managed-by" = "terraform"
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}
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}
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resource "kubernetes_deployment" "x402" {
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metadata {
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name = local.full_name
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namespace = var.namespace
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labels = local.labels
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}
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spec {
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replicas = var.replicas
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selector {
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match_labels = { app = local.full_name }
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}
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strategy {
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type = "RollingUpdate"
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rolling_update {
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max_surge = 1
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max_unavailable = 0
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}
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}
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template {
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metadata {
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labels = local.labels
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}
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spec {
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image_pull_secrets {
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name = "registry-credentials"
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}
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container {
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name = "x402-gateway"
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image = "forgejo.viktorbarzin.me/viktor/x402-gateway:${var.image_tag}"
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port {
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name = "http"
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container_port = 8923
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}
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port {
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name = "metrics"
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container_port = 9090
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}
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env {
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name = "BIND"
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value = ":8923"
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}
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env {
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name = "METRICS_BIND"
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value = ":9090"
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}
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env {
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name = "TARGET"
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value = var.target_url
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}
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env {
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name = "WALLET_ADDRESS"
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value = var.wallet_address
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}
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env {
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name = "PRICE_LABEL"
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value = var.price_label
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}
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env {
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name = "PRICE_USDC_MICROS"
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value = tostring(var.price_usdc_micros)
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}
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env {
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name = "NETWORK"
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value = var.network
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}
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env {
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name = "FACILITATOR_URL"
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value = var.facilitator_url
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}
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dynamic "env" {
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for_each = var.bot_ua_regex == "" ? [] : [1]
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content {
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name = "BOT_UA_REGEX"
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value = var.bot_ua_regex
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}
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}
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resources {
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requests = {
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cpu = var.cpu_request
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memory = var.memory
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}
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limits = {
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memory = var.memory
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}
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}
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liveness_probe {
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http_get {
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path = "/healthz"
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port = "metrics"
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}
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initial_delay_seconds = 5
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period_seconds = 30
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failure_threshold = 3
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}
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readiness_probe {
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http_get {
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path = "/healthz"
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port = "metrics"
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}
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initial_delay_seconds = 1
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period_seconds = 5
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failure_threshold = 2
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}
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security_context {
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run_as_non_root = true
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run_as_user = 65532
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run_as_group = 65532
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allow_privilege_escalation = false
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read_only_root_filesystem = true
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capabilities {
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drop = ["ALL"]
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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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lifecycle {
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# KYVERNO_LIFECYCLE_V1: Kyverno admission webhook mutates dns_config with ndots=2
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ignore_changes = [spec[0].template[0].spec[0].dns_config]
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}
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}
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resource "kubernetes_service" "x402" {
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metadata {
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name = local.full_name
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namespace = var.namespace
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labels = local.labels
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annotations = {
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"prometheus.io/scrape" = "true"
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"prometheus.io/path" = "/metrics"
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"prometheus.io/port" = "9090"
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}
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}
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spec {
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selector = { app = local.full_name }
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port {
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name = "http"
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port = 8080
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target_port = 8923
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protocol = "TCP"
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}
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port {
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name = "metrics"
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port = 9090
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target_port = 9090
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protocol = "TCP"
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}
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}
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}
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resource "kubernetes_pod_disruption_budget_v1" "x402" {
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metadata {
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name = local.full_name
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namespace = var.namespace
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}
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spec {
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min_available = "1"
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selector {
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match_labels = { app = local.full_name }
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}
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}
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}
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output "service_name" {
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value = kubernetes_service.x402.metadata[0].name
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description = "ClusterIP service name. Pass this to ingress_factory `service_name` so Traefik routes through the gateway."
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}
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output "service_port" {
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value = 8080
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description = "Service port — same as the Anubis service for drop-in replacement in ingress_factory."
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}
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