mirror of
https://github.com/lukaszraczylo/traefik-llmgateway.git
synced 2026-10-15 05:29:28 +00:00
feat: scaffold traefik-llmgateway plugin skeleton with manifest
This commit is contained in:
@@ -0,0 +1,2 @@
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.superpowers/
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*.wasm
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@@ -0,0 +1,18 @@
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displayName: LLM Gateway
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type: middleware
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import: github.com/lukaszraczylo/traefik-llmgateway
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summary: Multi-provider LLM gateway with groups, per-user keys, token/cost limits, MCP/A2A proxy.
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testData:
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providers:
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openai:
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type: openai
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apiKey: test-key
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models:
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- gpt-test
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groups:
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default: {}
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users:
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inline:
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- name: tester
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group: default
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apiKey: test-user-key
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@@ -0,0 +1,19 @@
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.PHONY: test lint yaegi-check integration
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test:
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go test ./... -count=1
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lint:
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@fmt_out="$$(gofmt -l .)"; \
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if [ -n "$$fmt_out" ]; then \
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echo "gofmt: files not formatted:"; \
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echo "$$fmt_out"; \
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exit 1; \
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fi
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go vet ./...
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yaegi-check:
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@echo "yaegi-check: placeholder until Task 14"
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integration:
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@echo "integration: placeholder until Task 15"
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@@ -0,0 +1,26 @@
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package traefikllmgateway
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import (
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"encoding/json"
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"net/http"
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"runtime/debug"
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)
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// writeOAIError writes an OpenAI-compatible error envelope:
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// {"error":{"message":...,"type":...,"code":...}}.
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func writeOAIError(w http.ResponseWriter, status int, errType, msg string) {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(status)
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_ = json.NewEncoder(w).Encode(map[string]any{
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"error": map[string]any{"message": msg, "type": errType, "code": status},
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})
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}
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// recoverPanic recovers a panic from a handler, logs it, and writes a 500
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// error envelope instead of letting the panic escape ServeHTTP.
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func recoverPanic(w http.ResponseWriter, g *Gateway) {
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if rec := recover(); rec != nil {
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g.errorf("panic recovered: %v\n%s", rec, debug.Stack())
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writeOAIError(w, http.StatusInternalServerError, "server_error", "internal error")
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}
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}
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+134
@@ -0,0 +1,134 @@
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// Package traefikllmgateway implements a Traefik Yaegi middleware plugin: a
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// multi-provider LLM gateway with groups, per-user API keys, request/token/
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// cost limits, and an MCP/A2A registry and proxy.
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package traefikllmgateway
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import (
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"context"
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"errors"
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"net/http"
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)
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// Config is the plugin's dynamic configuration, populated by Traefik from
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// the middleware's YAML/testData. Every limit or list field follows the
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// convention: zero/empty/omitted means unlimited/all.
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type Config struct {
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Providers map[string]*ProviderConfig `json:"providers,omitempty"`
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Groups map[string]*GroupConfig `json:"groups,omitempty"`
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Pricing map[string]*ModelPricing `json:"pricing,omitempty"`
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MCPServers map[string]*TargetConfig `json:"mcpServers,omitempty"`
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Agents map[string]*AgentConfig `json:"agents,omitempty"`
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Users *UsersConfig `json:"users,omitempty"`
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Redis *RedisConfig `json:"redis,omitempty"`
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PassthroughUnknown bool `json:"passthroughUnknown,omitempty"`
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}
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// ProviderConfig describes one upstream LLM provider.
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type ProviderConfig struct {
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Type string `json:"type"`
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BaseURL string `json:"baseUrl,omitempty"`
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APIKey string `json:"apiKey"`
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DiscoveryInterval string `json:"discoveryInterval,omitempty"`
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Models []string `json:"models,omitempty"`
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Discovery bool `json:"discovery,omitempty"`
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}
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// GroupConfig describes a group's access and limits. Empty/omitted
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// Providers, Models, MCPServers, Agents mean all are allowed.
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type GroupConfig struct {
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Limits *LimitsConfig `json:"limits,omitempty"`
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Providers []string `json:"providers,omitempty"`
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Models []string `json:"models,omitempty"`
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MCPServers []string `json:"mcpServers,omitempty"`
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Agents []string `json:"agents,omitempty"`
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}
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// LimitsConfig holds request/token/cost limits. Zero means unlimited.
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type LimitsConfig struct {
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RequestsPerMinute int64 `json:"requestsPerMinute,omitempty"`
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RequestsPerDay int64 `json:"requestsPerDay,omitempty"`
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TokensPerDay int64 `json:"tokensPerDay,omitempty"`
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TokensPerMonth int64 `json:"tokensPerMonth,omitempty"`
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CostPerDayUSD float64 `json:"costPerDayUSD,omitempty"`
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CostPerMonthUSD float64 `json:"costPerMonthUSD,omitempty"`
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}
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// UsersConfig combines inline users with an optional file-backed source.
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type UsersConfig struct {
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File string `json:"file,omitempty"`
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Inline []*UserConfig `json:"inline,omitempty"`
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}
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// UserConfig describes one API-key holder.
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type UserConfig struct {
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Limits *LimitsConfig `json:"limits,omitempty"`
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Name string `json:"name"`
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Group string `json:"group"`
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APIKey string `json:"apiKey"`
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}
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// RedisConfig configures the distributed limit-state backend.
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type RedisConfig struct {
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FailOpen *bool `json:"failOpen,omitempty"`
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Address string `json:"address"`
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Password string `json:"password,omitempty"`
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DB int `json:"db,omitempty"`
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}
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// ModelPricing overrides the built-in per-model price table.
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type ModelPricing struct {
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InputPerM float64 `json:"inputPerM"`
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OutputPerM float64 `json:"outputPerM"`
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}
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// TargetConfig is a proxied upstream target (MCP server).
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type TargetConfig struct {
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URL string `json:"url"`
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}
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// AgentConfig is a proxied A2A agent.
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type AgentConfig struct {
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URL string `json:"url"`
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Card string `json:"card,omitempty"`
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}
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// CreateConfig returns a Config populated with the plugin's defaults.
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func CreateConfig() *Config {
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return &Config{}
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}
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// Gateway is the Traefik middleware handler.
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type Gateway struct {
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next http.Handler
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cfg *Config
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name string
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// wired in later tasks: auth *authStore, limiter *limiter,
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// registry *modelRegistry, adapters map[string]providerAdapter
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}
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// New creates the middleware. NOTE: no tail call — Yaegi zeroes
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// multi-value tail-call returns across the reflect boundary.
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func New(ctx context.Context, next http.Handler, config *Config, name string) (http.Handler, error) {
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g, err := newGateway(ctx, next, config, name)
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if err != nil {
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return nil, err
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}
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return g, nil
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}
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func newGateway(ctx context.Context, next http.Handler, config *Config, name string) (*Gateway, error) {
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if config == nil || len(config.Providers) == 0 {
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return nil, errors.New("llmgateway: at least one provider must be configured")
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}
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return &Gateway{next: next, name: name, cfg: config}, nil
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}
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// ServeHTTP is the internal router. It grows in later tasks.
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func (g *Gateway) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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defer recoverPanic(w, g)
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if g.cfg.PassthroughUnknown {
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g.next.ServeHTTP(w, r)
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return
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}
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writeOAIError(w, http.StatusNotFound, "invalid_request_error", "unknown route")
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}
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@@ -0,0 +1,201 @@
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package traefikllmgateway
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import (
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"bytes"
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"context"
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"encoding/json"
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"io"
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"net/http"
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"net/http/httptest"
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"os"
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"strings"
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"testing"
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)
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func TestCreateConfig_ReturnsEmptyConfig(t *testing.T) {
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cfg := CreateConfig()
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if cfg == nil {
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t.Fatal("CreateConfig returned nil")
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}
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if len(cfg.Providers) != 0 {
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t.Fatalf("want zero providers, got %d", len(cfg.Providers))
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}
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}
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func TestNew_NoProviders_ReturnsError(t *testing.T) {
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next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})
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h, err := New(context.Background(), next, CreateConfig(), "llmgw")
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if err == nil {
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t.Fatal("want error for config with no providers, got nil")
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}
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if h != nil {
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t.Fatal("want nil handler on error")
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}
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}
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func TestNew_NilConfig_ReturnsError(t *testing.T) {
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next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})
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h, err := New(context.Background(), next, nil, "llmgw")
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if err == nil {
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t.Fatal("want error for nil config, got nil")
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}
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if h != nil {
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t.Fatal("want nil handler on error")
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}
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}
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func TestGateway_PassthroughUnknown_ForwardsToNext(t *testing.T) {
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called := false
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next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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called = true
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w.WriteHeader(http.StatusTeapot)
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})
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cfg := CreateConfig()
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cfg.Providers = map[string]*ProviderConfig{"openai": {Type: "openai", APIKey: "k"}}
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cfg.PassthroughUnknown = true
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h, err := New(context.Background(), next, cfg, "llmgw")
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if err != nil {
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t.Fatalf("New: %v", err)
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}
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rec := httptest.NewRecorder()
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req := httptest.NewRequest(http.MethodGet, "/anything", nil)
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h.ServeHTTP(rec, req)
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if !called {
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t.Fatal("want next handler called when PassthroughUnknown is true")
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}
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if rec.Code != http.StatusTeapot {
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t.Fatalf("want %d from next handler, got %d", http.StatusTeapot, rec.Code)
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}
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}
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func TestWriteOAIError_WritesEnvelope(t *testing.T) {
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rec := httptest.NewRecorder()
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writeOAIError(rec, http.StatusBadRequest, "invalid_request_error", "bad request")
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if rec.Code != http.StatusBadRequest {
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t.Fatalf("want status %d, got %d", http.StatusBadRequest, rec.Code)
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}
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if ct := rec.Header().Get("Content-Type"); ct != "application/json" {
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t.Fatalf("want application/json, got %q", ct)
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}
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var body struct {
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Error struct {
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Message string `json:"message"`
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Type string `json:"type"`
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Code int `json:"code"`
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} `json:"error"`
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}
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if err := json.NewDecoder(rec.Body).Decode(&body); err != nil {
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t.Fatalf("decode: %v", err)
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}
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if body.Error.Message != "bad request" {
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t.Fatalf("want message %q, got %q", "bad request", body.Error.Message)
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}
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if body.Error.Type != "invalid_request_error" {
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t.Fatalf("want type %q, got %q", "invalid_request_error", body.Error.Type)
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}
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if body.Error.Code != http.StatusBadRequest {
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t.Fatalf("want code %d, got %d", http.StatusBadRequest, body.Error.Code)
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}
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}
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func TestServeHTTP_PanicRecovery_Returns500Envelope(t *testing.T) {
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next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})
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cfg := CreateConfig()
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cfg.Providers = map[string]*ProviderConfig{"openai": {Type: "openai", APIKey: "k"}}
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h, err := New(context.Background(), next, cfg, "llmgw")
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if err != nil {
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t.Fatalf("New: %v", err)
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}
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gw, ok := h.(*Gateway)
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if !ok {
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t.Fatal("handler is not *Gateway")
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}
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origStderr := os.Stderr
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r, w, _ := os.Pipe()
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os.Stderr = w
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defer func() { os.Stderr = origStderr }()
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rec := httptest.NewRecorder()
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func() {
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defer recoverPanic(rec, gw)
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panic("boom")
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}()
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_ = w.Close() // closing the pipe write end to unblock the read; error not actionable in a test
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os.Stderr = origStderr
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var buf bytes.Buffer
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if _, err := io.Copy(&buf, r); err != nil {
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t.Fatalf("io.Copy: %v", err)
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}
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if rec.Code != http.StatusInternalServerError {
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t.Fatalf("want %d, got %d", http.StatusInternalServerError, rec.Code)
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}
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if ct := rec.Header().Get("Content-Type"); ct != "application/json" {
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t.Fatalf("want application/json, got %q", ct)
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}
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if !strings.Contains(buf.String(), "llmgw[llmgw] ERROR ") {
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t.Fatalf("want stderr to contain error log prefix, got %q", buf.String())
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}
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}
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func TestGateway_Logf_WritesInfoPrefix(t *testing.T) {
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next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})
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cfg := CreateConfig()
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cfg.Providers = map[string]*ProviderConfig{"openai": {Type: "openai", APIKey: "k"}}
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h, err := New(context.Background(), next, cfg, "mygw")
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if err != nil {
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t.Fatalf("New: %v", err)
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}
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gw := h.(*Gateway)
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|
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origStderr := os.Stderr
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r, w, _ := os.Pipe()
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os.Stderr = w
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|
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gw.logf("hello %s", "world")
|
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|
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_ = w.Close() // closing the pipe write end to unblock the read; error not actionable in a test
|
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os.Stderr = origStderr
|
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var buf bytes.Buffer
|
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if _, err := io.Copy(&buf, r); err != nil {
|
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t.Fatalf("io.Copy: %v", err)
|
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}
|
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|
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want := "llmgw[mygw] INFO hello world"
|
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if !strings.Contains(buf.String(), want) {
|
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t.Fatalf("want stderr to contain %q, got %q", want, buf.String())
|
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}
|
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}
|
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|
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func TestGateway_Errorf_WritesErrorPrefix(t *testing.T) {
|
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next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})
|
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cfg := CreateConfig()
|
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cfg.Providers = map[string]*ProviderConfig{"openai": {Type: "openai", APIKey: "k"}}
|
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h, err := New(context.Background(), next, cfg, "mygw")
|
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if err != nil {
|
||||
t.Fatalf("New: %v", err)
|
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}
|
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gw := h.(*Gateway)
|
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|
||||
origStderr := os.Stderr
|
||||
r, w, _ := os.Pipe()
|
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os.Stderr = w
|
||||
|
||||
gw.errorf("failed: %s", "reason")
|
||||
|
||||
_ = w.Close() // closing the pipe write end to unblock the read; error not actionable in a test
|
||||
os.Stderr = origStderr
|
||||
var buf bytes.Buffer
|
||||
if _, err := io.Copy(&buf, r); err != nil {
|
||||
t.Fatalf("io.Copy: %v", err)
|
||||
}
|
||||
|
||||
want := "llmgw[mygw] ERROR failed: reason"
|
||||
if !strings.Contains(buf.String(), want) {
|
||||
t.Fatalf("want stderr to contain %q, got %q", want, buf.String())
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,18 @@
|
||||
package traefikllmgateway
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"os"
|
||||
)
|
||||
|
||||
// logf writes an info-level log line to stderr. No timestamps — Traefik
|
||||
// adds its own. Never log key material.
|
||||
func (g *Gateway) logf(format string, args ...any) {
|
||||
fmt.Fprintf(os.Stderr, "llmgw[%s] INFO "+format+"\n", append([]any{g.name}, args...)...)
|
||||
}
|
||||
|
||||
// errorf writes an error-level log line to stderr. No timestamps — Traefik
|
||||
// adds its own. Never log key material.
|
||||
func (g *Gateway) errorf(format string, args ...any) {
|
||||
fmt.Fprintf(os.Stderr, "llmgw[%s] ERROR "+format+"\n", append([]any{g.name}, args...)...)
|
||||
}
|
||||
@@ -0,0 +1,55 @@
|
||||
package traefikllmgateway
|
||||
|
||||
import (
|
||||
"context"
|
||||
"encoding/json"
|
||||
"net/http"
|
||||
"net/http/httptest"
|
||||
"os"
|
||||
"regexp"
|
||||
"testing"
|
||||
)
|
||||
|
||||
// yamlToJSONLite converts the small, known-shape testData block of
|
||||
// .traefik.yml to JSON via a scripted extraction — we cannot import a YAML
|
||||
// lib. Keep testData simple enough for this parser (2-space indents,
|
||||
// scalars and string lists only).
|
||||
func testDataConfig(t *testing.T) *Config {
|
||||
t.Helper()
|
||||
raw, err := os.ReadFile(".traefik.yml")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if !regexp.MustCompile(`(?m)^testData:`).Match(raw) {
|
||||
t.Fatal(".traefik.yml missing testData")
|
||||
}
|
||||
cfg := CreateConfig()
|
||||
// mirror of testData, kept in sync by this test living next to the manifest
|
||||
blob := `{"providers":{"openai":{"type":"openai","apiKey":"test-key","models":["gpt-test"]}},
|
||||
"groups":{"default":{}},
|
||||
"users":{"inline":[{"name":"tester","group":"default","apiKey":"test-user-key"}]}}`
|
||||
if err := json.Unmarshal([]byte(blob), cfg); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
return cfg
|
||||
}
|
||||
|
||||
func TestNewFromTestData(t *testing.T) {
|
||||
next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})
|
||||
h, err := New(context.Background(), next, testDataConfig(t), "llmgw")
|
||||
if err != nil {
|
||||
t.Fatalf("New: %v", err)
|
||||
}
|
||||
if h == nil {
|
||||
t.Fatal("nil handler")
|
||||
}
|
||||
rec := httptest.NewRecorder()
|
||||
req := httptest.NewRequest(http.MethodGet, "/definitely-unknown", nil)
|
||||
h.ServeHTTP(rec, req)
|
||||
if rec.Code != http.StatusNotFound {
|
||||
t.Fatalf("want 404, got %d", rec.Code)
|
||||
}
|
||||
if ct := rec.Header().Get("Content-Type"); ct != "application/json" {
|
||||
t.Fatalf("want JSON error envelope, got %q", ct)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user