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package cryptomarket
import (
"context"
"encoding/json"
"net/http"
"net/http/httptest"
"os"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
)
func mockKraken(t *testing.T, mode string) (*Client, *atomic.Int32) {
t.Helper()
calls := &atomic.Int32{}
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
calls.Add(1)
if mode == "http" {
w.WriteHeader(429)
return
}
if mode == "error" {
w.Write([]byte(`{"error":["EAPI:Rate limit exceeded"]}`))
return
}
result := any(nil)
switch r.URL.Path {
case "/SystemStatus":
status := "online"
if mode == "maintenance" {
status = "maintenance"
}
result = map[string]string{"status": status}
case "/AssetPairs":
m := map[string]any{}
for _, i := range Instruments {
status := "online"
if mode == "halted" && i.Symbol == "BTC" {
status = "cancel_only"
}
m[i.Key] = map[string]string{"status": status}
}
result = m
case "/Ticker":
m := map[string]any{}
for _, i := range Instruments {
bid, ask := "100", "101"
if mode == "crossed" && i.Symbol == "BTC" {
bid = "102"
}
m[i.Key] = map[string]any{"a": []string{ask}, "b": []string{bid}}
}
result = m
case "/OHLC":
key := ""
for _, i := range Instruments {
if i.Pair == r.URL.Query().Get("pair") {
key = i.Key
}
}
now := time.Now().UTC().Truncate(24 * time.Hour).Unix()
high := "110"
if mode == "bad-candle" {
high = "99"
}
result = map[string]any{key: [][]any{{now - 86400, "100", high, "90", "101", "100", "1", 1}, {now, "100", "110", "90", "102", "100", "1", 1}}, "last": now}
default:
t.Errorf("unexpected URL %s", r.URL)
}
json.NewEncoder(w).Encode(map[string]any{"error": []string{}, "result": result})
}))
t.Cleanup(srv.Close)
c := NewClient()
c.Base = srv.URL
return c, calls
}
func TestClientValidatesQuotesAndCompletedCandles(t *testing.T) {
for _, mode := range []string{"ok", "halted", "crossed", "bad-candle"} {
t.Run(mode, func(t *testing.T) {
c, _ := mockKraken(t, mode)
s, e := c.Fetch(context.Background(), []string{"BTC"})
if e != nil {
t.Fatal(e)
}
_, quoted := s.Quotes["BTC"]
if quoted != (mode != "halted" && mode != "crossed") {
t.Fatal(s.Quotes)
}
n := len(s.Candles["BTC"])
if mode == "bad-candle" {
if n != 0 {
t.Fatal("invalid candle")
}
} else if n != 1 {
t.Fatal("unfinished candle included", n)
}
})
}
}
func TestClientErrorsBackoffAndCancellation(t *testing.T) {
for _, mode := range []string{"http", "error", "maintenance"} {
c, calls := mockKraken(t, mode)
for i := 0; i < 2; i++ {
if _, e := c.Fetch(context.Background(), []string{"BTC"}); e == nil {
t.Fatal(mode)
}
}
if calls.Load() != 1 {
t.Fatal("no backoff")
}
}
c, _ := mockKraken(t, "ok")
ctx, cancel := context.WithCancel(context.Background())
cancel()
if _, e := c.Fetch(ctx, []string{"BTC"}); e == nil {
t.Fatal("ignored cancellation")
}
if _, e := c.Fetch(context.Background(), []string{"BTC/../../"}); e == nil {
t.Fatal("symbol injection")
}
}
func TestClientCoalescesAndDoesNotShareMutableCache(t *testing.T) {
c, calls := mockKraken(t, "ok")
var wg sync.WaitGroup
for i := 0; i < 10; i++ {
wg.Add(1)
go func() {
defer wg.Done()
s, e := c.Fetch(context.Background(), []string{"BTC"})
if e != nil {
t.Error(e)
return
}
delete(s.Quotes, "BTC")
s.Candles["BTC"][0].Close = "1"
}()
}
wg.Wait()
// One explicit interaction fetches only the requested pair: status,
// metadata, ticker and daily history. The rest are cache hits.
if calls.Load() != 4 {
t.Fatalf("requests %d want 4", calls.Load())
}
s, e := c.Fetch(context.Background(), []string{"BTC"})
if e != nil || s.Quotes["BTC"].Bid != "100" || s.Candles["BTC"][0].Close != "101" {
t.Fatal(s, e)
}
}
func TestKrakenLive(t *testing.T) {
if os.Getenv("TEST_KRAKEN_LIVE") != "1" {
t.Skip("set TEST_KRAKEN_LIVE=1 for public-API smoke test")
}
c := NewClient()
ctx, cancel := context.WithTimeout(context.Background(), 50*time.Second)
defer cancel()
s, e := c.Fetch(ctx, []string{"BTC", "SHIB"})
if e != nil {
t.Fatal(e)
}
for _, symbol := range []string{"BTC", "SHIB"} {
q, ok := s.Quotes[symbol]
if !ok || q.Validate(time.Now()) != nil || len(s.Candles[symbol]) < 2 {
t.Fatalf("%s missing quotes/candles", symbol)
}
t.Log(symbol, q.Bid, q.Ask, strings.Join(Chart(s.Candles[symbol], 30, false, nil), "\n"))
}
}
func TestClientCancellationDoesNotPoisonSharedBackoff(t *testing.T) {
started := make(chan struct{})
release := make(chan struct{})
var once sync.Once
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Block the first request so the caller can cancel it mid-fetch.
once.Do(func() { close(started); <-release })
result := any(nil)
switch r.URL.Path {
case "/SystemStatus":
result = map[string]string{"status": "online"}
case "/AssetPairs":
m := map[string]any{}
for _, i := range Instruments {
m[i.Key] = map[string]string{"status": "online"}
}
result = m
case "/Ticker":
m := map[string]any{}
for _, i := range Instruments {
m[i.Key] = map[string]any{"a": []string{"100"}, "b": []string{"99"}}
}
result = m
case "/OHLC":
result = map[string]any{}
default:
t.Errorf("unexpected URL %s", r.URL)
}
json.NewEncoder(w).Encode(map[string]any{"error": []string{}, "result": result})
}))
defer srv.Close()
c := NewClient()
c.Base = srv.URL
ctx, cancel := context.WithCancel(context.Background())
done := make(chan struct{})
go func() { _, _ = c.Fetch(ctx, []string{"BTC"}); close(done) }()
<-started
cancel()
<-done
close(release)
// A later caller must not inherit the cancelled caller's backoff.
if _, e := c.Fetch(context.Background(), []string{"BTC"}); e != nil {
t.Fatalf("cancelled fetch poisoned the shared client: %v", e)
}
}
func TestHaltedSymbolIsFreshAfterAttempt(t *testing.T) {
c, calls := mockKraken(t, "halted")
if s, e := c.Fetch(context.Background(), []string{"BTC"}); e != nil {
t.Fatal(e)
} else if _, ok := s.Quotes["BTC"]; ok {
t.Fatal("halted symbol unexpectedly quoted")
}
first := calls.Load()
if first != 4 {
t.Fatalf("first fetch calls = %d, want 4", first)
}
// A halted/delisted pair has no quote, but the attempt must be cached so
// the next command does not re-run the full request chain forever.
if _, e := c.Fetch(context.Background(), []string{"BTC"}); e != nil {
t.Fatal(e)
}
if calls.Load() != first {
t.Fatalf("halted symbol re-fetched: %d -> %d", first, calls.Load())
}
}
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