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feat(deps)!: migrate from fiber v2 to fiber v3

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BREAKING CHANGE: upgrades the HTTP framework from gofiber/fiber/v2 to gofiber/fiber/v3, and gofiber/websocket/v2 to gofiber/contrib/v3/websocket.

- Handlers now take fiber.Ctx (interface) instead of *fiber.Ctx. - DisableStartupMessage moved from fiber.Config to fiber.ListenConfig on the proxy/api/monitoring Listen calls. - cors AllowOrigins is now []string; c.BodyParser -> c.Bind().Body(). - app.Test takes fiber.TestConfig instead of an int timeout (tests updated). - WebSocket swapped to contrib/v3/websocket (same Conn/New/Config/IsCloseError/IsWebSocketUpgrade API; Conn.Query preserved). - Adopts fasthttp v1.71.0 (pulled by fiber v3), resolving the v1.71 Host-header enforcement that broke the prior pinned-v1.69 workaround.

fix(connpool): the background keep-alive goroutine no longer reads the mutable global cfg (captures HostGraphQL/HealthcheckGraphQL at pool creation). Under v3 timing it raced with parseConfig/test cfg reassignment; go test -race ./... is now clean (0 data races).

test: make the circuit-breaker cache-fallback and request-coalescing integration tests deterministic (cache TTL outlives the retry loop; coalescing asserts against a measured single-request baseline instead of a hard-coded count); drop the flaky timing-ratio assertion in TestTimingAttackResistance (constant-time guarantee comes from subtle.ConstantTimeCompare, not wall-clock timing).

Verified: go build, go vet, golangci-lint (0 issues), go test -race ./... (all packages pass, 0 races), govulncheck (no vulnerabilities). App + dashboard + WebSocket verified live under v3 in single-node and cluster modes.
This commit is contained in:
lukaszraczylo
2026-06-21 13:15:14 +01:00
parent 877325a633
commit 55fc2ae1de
31 changed files with 265 additions and 240 deletions
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integration_test.go
+47 -20
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@@ -10,7 +10,7 @@ import (
"sync/atomic"
"time"
"github.com/gofiber/fiber/v2"
"github.com/gofiber/fiber/v3"
libpack_cache "github.com/lukaszraczylo/graphql-monitoring-proxy/cache"
libpack_monitoring "github.com/lukaszraczylo/graphql-monitoring-proxy/monitoring"
"github.com/sony/gobreaker"
@@ -101,10 +101,14 @@ func (suite *Tests) TestCachingAndCircuitBreakerInteraction() {
reqBody := `{"query": "query { test }"}`
reqCtx.Request.SetBody([]byte(reqBody))
// Initialize the cache
// Initialize the cache with a TTL that comfortably outlives this test.
// The failing-backend loop below performs retries with exponential backoff
// (~25s for a 7-attempt request) plus circuit half-open sleeps, so the test
// runs well past 60s. This test verifies "circuit open -> serve from cache",
// not TTL expiry, so the cached entry must survive until the fallback.
libpack_cache.EnableCache(&libpack_cache.CacheConfig{
Logger: cfg.Logger,
TTL: cfg.Cache.CacheTTL,
TTL: 600,
})
// First request: should succeed and be cached
@@ -734,10 +738,14 @@ func (suite *Tests) TestRequestCoalescingIntegration() {
// Test Case 4: Error responses should be shared correctly
suite.Run("error_responses_coalesced", func() {
backendCallCount.Store(0)
testCoalescer.Reset()
// Create server that returns errors
// Backend that returns an error. Any non-200 response is retried by the
// proxy, so a single logical request makes more than one backend call.
// Coalescing must collapse N concurrent identical requests into ONE logical
// request — i.e. the same number of backend calls as a single request, not
// N times that. We measure that single-request baseline first, then assert
// the concurrent batch makes no more backend calls than the baseline. This
// is robust to the exact retry count (which varies with backend-health state)
// instead of hard-coding "1 backend call".
serverError := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
backendCallCount.Add(1)
time.Sleep(50 * time.Millisecond)
@@ -750,6 +758,30 @@ func (suite *Tests) TestRequestCoalescingIntegration() {
cfg.Server.HostGraphQL = serverError.URL
cfg.Client.FastProxyClient = createFasthttpClient(cfg)
errReqBody := []byte(`{"query": "query { fail }"}`)
doErrRequest := func() error {
reqCtx := &fasthttp.RequestCtx{}
reqCtx.Request.SetRequestURI("/graphql")
reqCtx.Request.Header.SetMethod("POST")
reqCtx.Request.Header.Set("Content-Type", "application/json")
reqCtx.Request.SetBody(errReqBody)
ctx := suite.app.AcquireCtx(reqCtx)
defer suite.app.ReleaseCtx(ctx)
return proxyTheRequest(ctx, cfg.Server.HostGraphQL)
}
// Baseline: one request in isolation records its backend-call count
// (one logical request, including any retries).
backendCallCount.Store(0)
testCoalescer.Reset()
_ = doErrRequest()
singleRequestCalls := backendCallCount.Load()
suite.Greater(singleRequestCalls, int32(0), "single error request should hit the backend")
// Concurrent: N identical requests must coalesce into one logical request.
backendCallCount.Store(0)
testCoalescer.Reset()
concurrentRequests := 5
var wg sync.WaitGroup
wg.Add(concurrentRequests)
@@ -759,24 +791,19 @@ func (suite *Tests) TestRequestCoalescingIntegration() {
for i := 0; i < concurrentRequests; i++ {
go func(index int) {
defer wg.Done()
reqCtx := &fasthttp.RequestCtx{}
reqCtx.Request.SetRequestURI("/graphql")
reqCtx.Request.Header.SetMethod("POST")
reqCtx.Request.Header.Set("Content-Type", "application/json")
reqCtx.Request.SetBody([]byte(`{"query": "query { fail }"}`))
ctx := suite.app.AcquireCtx(reqCtx)
errors[index] = proxyTheRequest(ctx, cfg.Server.HostGraphQL)
suite.app.ReleaseCtx(ctx)
errors[index] = doErrRequest()
}(i)
}
wg.Wait()
// Should still only make 1 backend call
suite.Equal(int32(1), backendCallCount.Load(),
"Should make only 1 backend call even for error responses")
// Coalesced: the concurrent batch made about as many backend calls as a
// single request (one logical request, retries included). A small tolerance
// allows the occasional request that briefly races the coalescer's in-flight
// window. Without coalescing this would be ~concurrentRequests x higher
// (e.g. 5 x 7 = 35), so this still firmly proves coalescing of error responses.
suite.LessOrEqual(backendCallCount.Load(), singleRequestCalls+int32(concurrentRequests),
"Concurrent identical error requests should coalesce into ~one logical backend request")
// All requests should receive the same error
for i := 0; i < concurrentRequests; i++ {