399 lines
14 KiB
Go
399 lines
14 KiB
Go
package proxy_test
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// v1 acceptance tests for the proxy: leases, queueing, accounting, header route override.
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// They drive the whole handler over real HTTP against fake upstreams; only what a client or an
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// operator can observe is asserted (status codes, headers, the accounting rows, the health table).
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/http/httptest"
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"path/filepath"
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"strings"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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"git.wntrmute.dev/kyle/crossbar/internal/config"
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"git.wntrmute.dev/kyle/crossbar/internal/health"
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"git.wntrmute.dev/kyle/crossbar/internal/lease"
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"git.wntrmute.dev/kyle/crossbar/internal/limiter"
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"git.wntrmute.dev/kyle/crossbar/internal/proxy"
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"git.wntrmute.dev/kyle/crossbar/internal/store"
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)
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// upstream is a llama-server stand-in: streams N chunks with a delay, reports usage/timings in
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// the final chunk, counts requests, and can be slowed down or killed.
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type upstream struct {
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name string
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srv *httptest.Server
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hits atomic.Int32
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delay time.Duration
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mu sync.Mutex
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last recorded
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}
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type recorded struct{ method, path, host, xff, body string }
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func newUpstream(t *testing.T, name string) *upstream {
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u := &upstream{name: name}
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mux := http.NewServeMux()
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mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) { fmt.Fprint(w, `{"status":"ok"}`) })
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mux.HandleFunc("/v1/models", func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprint(w, `{"object":"list","data":[{"id":"shared"},{"id":"`+name+`-only"}]}`)
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})
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mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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u.hits.Add(1)
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b, _ := io.ReadAll(r.Body)
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u.mu.Lock()
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u.last = recorded{r.Method, r.URL.RequestURI(), r.Host, r.Header.Get("X-Forwarded-For"), string(b)}
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u.mu.Unlock()
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var req struct {
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Stream bool `json:"stream"`
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}
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_ = json.Unmarshal(b, &req)
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w.Header().Set("X-Upstream", name)
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time.Sleep(u.delay)
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if !req.Stream {
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w.Header().Set("Content-Type", "application/json")
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fmt.Fprintf(w, `{"choices":[{"message":{"role":"assistant","content":"hi from %s"}}],"usage":{"prompt_tokens":100,"completion_tokens":10,"total_tokens":110},"timings":{"prompt_n":100,"cache_n":90,"predicted_n":10,"predicted_ms":50.0}}`, name)
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return
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}
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w.Header().Set("Content-Type", "text/event-stream")
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w.WriteHeader(200)
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fl := w.(http.Flusher)
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for i := 0; i < 3; i++ {
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fmt.Fprintf(w, "data: {\"choices\":[{\"delta\":{\"content\":\"%s %d \"}}]}\n\n", name, i)
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fl.Flush()
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time.Sleep(10 * time.Millisecond)
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}
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fmt.Fprint(w, `data: {"choices":[],"usage":{"prompt_tokens":200,"completion_tokens":20,"total_tokens":220},"timings":{"prompt_n":200,"cache_n":150,"predicted_n":20,"predicted_ms":80.0}}`+"\n\n")
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fl.Flush()
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fmt.Fprint(w, "data: [DONE]\n\n")
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})
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u.srv = httptest.NewServer(mux)
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t.Cleanup(u.srv.Close)
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return u
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}
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func (u *upstream) lastReq() recorded { u.mu.Lock(); defer u.mu.Unlock(); return u.last }
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// rig is one crossbar: config, real health table (polled once), real lease table over a real
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// SQLite store, real limiter, the proxy handler served by httptest.
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type rig struct {
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t *testing.T
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cfg *config.Config
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health *health.Table
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store *store.Store
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leases *lease.Table
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lim *limiter.Limiter
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front *httptest.Server
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}
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// newRig builds crossbar from a config text where %s placeholders are the upstream base URLs.
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func newRig(t *testing.T, cfgText string, ups ...*upstream) *rig {
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urls := make([]any, len(ups))
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for i, u := range ups {
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urls[i] = u.srv.URL
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}
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cfg, err := config.Parse(strings.NewReader(fmt.Sprintf(cfgText, urls...)))
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if err != nil {
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t.Fatal(err)
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}
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bases := map[string]string{}
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for name, h := range cfg.Hosts {
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bases[name] = h.BaseURL
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}
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ht := health.New(bases, time.Hour, nil)
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ht.PollOnce(t.Context())
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st, err := store.Open(filepath.Join(t.TempDir(), "crossbar.db"))
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if err != nil {
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t.Fatal(err)
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}
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t.Cleanup(func() { _ = st.Close() })
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lim := limiter.New()
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for name, h := range cfg.Hosts {
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for model, m := range h.Models {
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lim.Configure(name, model, m.Parallel, cfg.QueueMax)
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}
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}
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lt, err := lease.New(st, proxy.HostView(ht, cfg), proxy.Chooser(cfg, ht, lim), cfg.LeaseIdle.Duration)
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if err != nil {
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t.Fatal(err)
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}
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p := proxy.New(cfg, ht, lt, lim, st, nil)
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front := httptest.NewServer(p)
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t.Cleanup(front.Close)
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return &rig{t: t, cfg: cfg, health: ht, store: st, leases: lt, lim: lim, front: front}
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}
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const twoHosts = `
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listen = "127.0.0.1:1"
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queue_max = 1
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lease_idle = "30m"
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[hosts.alpha]
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base_url = %q
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weight = 1.0
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models = { "shared" = { parallel = 2 }, "alpha-only" = { } }
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[hosts.beta]
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base_url = %q
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weight = 2.0
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models = { "shared" = { parallel = 2 }, "beta-only" = { } }
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[routes.r]
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hosts = ["alpha", "beta"]
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default_model = "shared"
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[routes.other]
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hosts = ["alpha"]
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`
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func conversation(id, turn int) string {
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msgs := fmt.Sprintf(`{"role":"system","content":"project"},{"role":"user","content":"conversation %d opening"}`, id)
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for i := 1; i < turn; i++ {
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msgs += fmt.Sprintf(`,{"role":"assistant","content":"ok"},{"role":"user","content":"turn %d"}`, i)
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}
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return `{"model":"shared","stream":false,"messages":[` + msgs + `]}`
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}
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func (r *rig) post(path, body string, hdr ...string) *http.Response {
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req, _ := http.NewRequest(http.MethodPost, r.front.URL+path, strings.NewReader(body))
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req.Header.Set("Content-Type", "application/json")
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for i := 0; i+1 < len(hdr); i += 2 {
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req.Header.Set(hdr[i], hdr[i+1])
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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r.t.Fatal(err)
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}
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return resp
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}
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func drain(resp *http.Response) string {
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b, _ := io.ReadAll(resp.Body)
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resp.Body.Close()
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return string(b)
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}
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func TestConversationIsStickyAndLeaseHeaderTellsWhy(t *testing.T) {
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alpha, beta := newUpstream(t, "alpha"), newUpstream(t, "beta")
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r := newRig(t, twoHosts, alpha, beta)
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first := r.post("/r/v1/chat/completions", conversation(1, 1))
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drain(first)
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host := first.Header.Get(proxy.HostHeader)
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if first.StatusCode != 200 || host != "beta" { // beta: same free slots, double weight
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t.Fatalf("first turn: %d from %q, want 200 from beta", first.StatusCode, host)
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}
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if got := first.Header.Get(proxy.LeaseHeader); got != "new" {
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t.Errorf("%s = %q on the first turn, want new", proxy.LeaseHeader, got)
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}
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// Take alpha's slots away as a "better host" signal: it must not matter, the lease holds.
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for turn := 2; turn <= 6; turn++ {
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resp := r.post("/r/v1/chat/completions", conversation(1, turn))
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drain(resp)
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if resp.Header.Get(proxy.HostHeader) != host || resp.Header.Get(proxy.LeaseHeader) != "reused" {
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t.Fatalf("turn %d: host %q lease %q, want %q reused", turn, resp.Header.Get(proxy.HostHeader), resp.Header.Get(proxy.LeaseHeader), host)
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}
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}
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if alpha.hits.Load() != 0 || beta.hits.Load() != 6 {
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t.Errorf("hits alpha=%d beta=%d, want 0 and 6", alpha.hits.Load(), beta.hits.Load())
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}
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}
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func TestDifferentConversationsSpreadByFreeSlots(t *testing.T) {
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alpha, beta := newUpstream(t, "alpha"), newUpstream(t, "beta")
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beta.delay = 300 * time.Millisecond
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r := newRig(t, twoHosts, alpha, beta)
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// Two slow conversations occupy beta's two "shared" slots…
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var wg sync.WaitGroup
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for i := 1; i <= 2; i++ {
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wg.Add(1)
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go func(i int) { defer wg.Done(); drain(r.post("/r/v1/chat/completions", conversation(i, 1))) }(i)
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}
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time.Sleep(100 * time.Millisecond)
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// …so a third conversation starting now is sent to alpha (beta has 0 free slots, alpha 2).
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resp := r.post("/r/v1/chat/completions", conversation(3, 1))
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drain(resp)
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if resp.Header.Get(proxy.HostHeader) != "alpha" {
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t.Errorf("third conversation went to %q, want alpha (free slots beat weight)", resp.Header.Get(proxy.HostHeader))
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}
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wg.Wait()
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}
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func TestQueueFullIs503(t *testing.T) {
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alpha := newUpstream(t, "alpha")
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alpha.delay = 400 * time.Millisecond
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r := newRig(t, `
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listen = "127.0.0.1:1"
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queue_max = 1
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[hosts.alpha]
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base_url = %q
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models = { "shared" = { parallel = 1 } }
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[routes.r]
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hosts = ["alpha"]
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default_model = "shared"
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`, alpha)
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codes := make(chan int, 3)
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for i := 1; i <= 3; i++ {
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go func(i int) {
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resp := r.post("/r/v1/chat/completions", conversation(i, 1))
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drain(resp)
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codes <- resp.StatusCode
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}(i)
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time.Sleep(30 * time.Millisecond) // arrival order: 1 runs, 2 queues, 3 finds the queue full
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}
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got := map[int]int{}
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for i := 0; i < 3; i++ {
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got[<-codes]++
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}
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if got[200] != 2 || got[503] != 1 {
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t.Fatalf("status counts = %v, want two 200 and one 503", got)
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}
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rows, err := r.store.Usage(time.Time{}, store.ByRoute)
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if err != nil || len(rows) != 1 || rows[0].Requests != 3 || rows[0].Errors != 1 {
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t.Errorf("usage = %+v %v, want 3 requests, 1 error (the 503 is recorded too)", rows, err)
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}
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if rows[0].QueuedMs <= 0 {
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t.Errorf("the queued request must record its wait: %+v", rows[0])
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}
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}
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func TestUnhealthyHostReleasesAndMoves(t *testing.T) {
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alpha, beta := newUpstream(t, "alpha"), newUpstream(t, "beta")
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r := newRig(t, twoHosts, alpha, beta)
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drain(r.post("/r/v1/chat/completions", conversation(1, 1))) // lands on beta
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beta.srv.Close()
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resp := r.post("/r/v1/chat/completions", conversation(1, 2))
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drain(resp)
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if resp.StatusCode != http.StatusBadGateway {
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t.Fatalf("first request after beta died: %d, want 502", resp.StatusCode)
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}
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if s, _ := r.health.Get("beta"); s.Healthy {
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t.Fatalf("beta must be marked down after the 502")
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}
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resp = r.post("/r/v1/chat/completions", conversation(1, 3))
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drain(resp)
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if resp.StatusCode != 200 || resp.Header.Get(proxy.HostHeader) != "alpha" || resp.Header.Get(proxy.LeaseHeader) != "new" {
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t.Errorf("after the move: %d from %q lease %q, want 200 alpha new", resp.StatusCode, resp.Header.Get(proxy.HostHeader), resp.Header.Get(proxy.LeaseHeader))
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}
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ev, _ := r.store.Events(time.Time{}, 10)
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var reasons []string
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for _, e := range ev {
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reasons = append(reasons, e.Reason)
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}
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if len(reasons) != 2 || reasons[0] != store.ReasonNew || reasons[1] != store.ReasonUnhealthy {
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t.Errorf("lease events = %v, want [new unhealthy]", reasons)
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}
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}
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func TestAccountingRowsFromUsageAndTimings(t *testing.T) {
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alpha, beta := newUpstream(t, "alpha"), newUpstream(t, "beta")
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r := newRig(t, twoHosts, alpha, beta)
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drain(r.post("/r/v1/chat/completions", conversation(1, 1))) // non-streamed
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drain(r.post("/r/v1/chat/completions", strings.Replace(conversation(1, 2), `"stream":false`, `"stream":true`, 1))) // streamed
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deadline := time.Now().Add(2 * time.Second)
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var rows []store.UsageRow
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for time.Now().Before(deadline) {
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rows, _ = r.store.Usage(time.Time{}, store.ByHost)
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if len(rows) == 1 && rows[0].Requests == 2 {
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break
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}
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time.Sleep(20 * time.Millisecond)
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}
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if len(rows) != 1 || rows[0].Requests != 2 {
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t.Fatalf("usage by host = %+v, want one host with 2 requests (rows may be written after the response completes, within 2 s)", rows)
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}
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u := rows[0]
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if u.PromptTokens != 300 || u.CachedTokens != 240 || u.CompletionTokens != 30 {
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t.Errorf("tokens = prompt %d cached %d completion %d, want 300/240/30 (100+200, 90+150, 10+20)", u.PromptTokens, u.CachedTokens, u.CompletionTokens)
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}
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if u.BusyMs <= 0 || u.Errors != 0 {
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t.Errorf("busy %d errors %d", u.BusyMs, u.Errors)
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}
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if got := u.CacheHitRatio(); got < 0.79 || got > 0.81 {
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t.Errorf("cache hit ratio = %v, want 0.8", got)
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}
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}
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func TestStreamIsUnalteredWhileTeed(t *testing.T) {
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alpha, beta := newUpstream(t, "alpha"), newUpstream(t, "beta")
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r := newRig(t, twoHosts, alpha, beta)
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resp := r.post("/r/v1/chat/completions", strings.Replace(conversation(9, 1), `"stream":false`, `"stream":true`, 1))
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body := drain(resp)
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want := 0
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for _, line := range strings.Split(body, "\n") {
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if strings.HasPrefix(line, "data: ") {
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want++
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}
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}
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if want != 5 || !strings.HasSuffix(strings.TrimSpace(body), "data: [DONE]") {
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t.Errorf("client must receive every SSE line untouched (3 deltas, usage, DONE); got %d data lines:\n%s", want, body)
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}
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}
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func TestHeaderRouteOverride(t *testing.T) {
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alpha, beta := newUpstream(t, "alpha"), newUpstream(t, "beta")
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r := newRig(t, twoHosts, alpha, beta)
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// The header names the route; the path has none.
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resp := r.post("/v1/chat/completions", conversation(1, 1), proxy.RouteHeader, "other")
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drain(resp)
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if resp.StatusCode != 200 || resp.Header.Get(proxy.HostHeader) != "alpha" {
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t.Errorf("header route 'other' (alpha only): %d from %q", resp.StatusCode, resp.Header.Get(proxy.HostHeader))
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}
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if alpha.lastReq().path != "/v1/chat/completions" {
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t.Errorf("upstream path = %q", alpha.lastReq().path)
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}
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// A path route and a header route that disagree: the header is the operator's intent → 400.
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resp = r.post("/r/v1/chat/completions", conversation(1, 1), proxy.RouteHeader, "other")
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if drain(resp); resp.StatusCode != 400 {
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t.Errorf("conflicting route in path and header: %d, want 400", resp.StatusCode)
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}
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resp = r.post("/v1/chat/completions", conversation(1, 1), proxy.RouteHeader, "nope")
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if drain(resp); resp.StatusCode != 404 {
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t.Errorf("unknown header route: %d, want 404", resp.StatusCode)
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}
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}
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func TestV0BehaviourStillHolds(t *testing.T) {
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alpha, beta := newUpstream(t, "alpha"), newUpstream(t, "beta")
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r := newRig(t, twoHosts, alpha, beta)
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for _, tc := range []struct {
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method, path string
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want int
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msg string
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}{
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{http.MethodGet, "/", 400, "missing route"},
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{http.MethodGet, "/nope/v1/models", 404, "unknown route"},
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{http.MethodGet, "/r/slots", 404, "not found"},
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{http.MethodGet, "/r/_crossbar/hosts", 404, "not found"},
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} {
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req, _ := http.NewRequest(tc.method, r.front.URL+tc.path, nil)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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t.Fatal(err)
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}
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body := drain(resp)
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var e map[string]string
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if resp.StatusCode != tc.want || json.Unmarshal([]byte(body), &e) != nil || e["error"] != tc.msg {
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t.Errorf("%s: %d %s, want %d %q", tc.path, resp.StatusCode, body, tc.want, tc.msg)
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}
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}
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big := strings.Repeat("x", proxy.MaxBody+1)
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resp := r.post("/r/v1/chat/completions", big)
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if drain(resp); resp.StatusCode != 413 {
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t.Errorf("oversize body: %d, want 413", resp.StatusCode)
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}
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// GET pass-through with query string, Host and X-Forwarded-For as in v0.
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resp, err := http.Get(r.front.URL + "/r/v1/models?x=1")
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if err != nil {
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t.Fatal(err)
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}
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drain(resp)
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host := resp.Header.Get(proxy.HostHeader)
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u := map[string]*upstream{"alpha": alpha, "beta": beta}[host]
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if u == nil || u.lastReq().path != "/v1/models?x=1" || u.lastReq().host != strings.TrimPrefix(u.srv.URL, "http://") || u.lastReq().xff == "" {
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t.Errorf("GET pass-through: host %q last %+v", host, u.lastReq())
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}
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}
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