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// Copyright (c) The go-grpc-middleware Authors.
// Licensed under the Apache License 2.0.
package ratelimit
import (
"context"
"errors"
"testing"
"github.com/stretchr/testify/assert"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
const errMsgFake = "fake error"
type ctxKey string
var ctxKeyShouldLimit = ctxKey("shouldLimit")
type mockGRPCServerStream struct {
grpc.ServerStream
ctx context.Context
}
func (m *mockGRPCServerStream) Context() context.Context {
return m.ctx
}
type mockContextBasedLimiter struct{}
func (*mockContextBasedLimiter) Limit(ctx context.Context) error {
shouldLimit, _ := ctx.Value(ctxKeyShouldLimit).(bool)
if shouldLimit {
return errors.New("rate limit exceeded")
}
return nil
}
func TestUnaryServerInterceptor_RateLimitPass(t *testing.T) {
limiter := new(mockContextBasedLimiter)
ctx := context.WithValue(context.Background(), ctxKeyShouldLimit, false)
interceptor := UnaryServerInterceptor(limiter)
handler := func(ctx context.Context, req any) (any, error) {
return nil, errors.New(errMsgFake)
}
info := &grpc.UnaryServerInfo{
FullMethod: "FakeMethod",
}
resp, err := interceptor(ctx, nil, info, handler)
assert.Nil(t, resp)
assert.EqualError(t, err, errMsgFake)
}
func TestStreamServerInterceptor_RateLimitPass(t *testing.T) {
limiter := new(mockContextBasedLimiter)
ctx := context.WithValue(context.Background(), ctxKeyShouldLimit, false)
interceptor := StreamServerInterceptor(limiter)
handler := func(srv any, stream grpc.ServerStream) error {
return errors.New(errMsgFake)
}
info := &grpc.StreamServerInfo{
FullMethod: "FakeMethod",
}
err := interceptor(nil, &mockGRPCServerStream{ctx: ctx}, info, handler)
assert.EqualError(t, err, errMsgFake)
}
func TestUnaryServerInterceptor_RateLimitFail(t *testing.T) {
limiter := new(mockContextBasedLimiter)
ctx := context.WithValue(context.Background(), ctxKeyShouldLimit, true)
interceptor := UnaryServerInterceptor(limiter)
called := false
handler := func(ctx context.Context, req any) (any, error) {
called = true
return nil, errors.New(errMsgFake)
}
info := &grpc.UnaryServerInfo{
FullMethod: "FakeMethod",
}
resp, err := interceptor(ctx, nil, info, handler)
expErr := status.Errorf(
codes.ResourceExhausted,
"%s is rejected by grpc_ratelimit middleware, please retry later. %s",
info.FullMethod,
"rate limit exceeded",
)
assert.Nil(t, resp)
assert.EqualError(t, err, expErr.Error())
assert.False(t, called)
}
func TestStreamServerInterceptor_RateLimitFail(t *testing.T) {
limiter := new(mockContextBasedLimiter)
ctx := context.WithValue(context.Background(), ctxKeyShouldLimit, true)
interceptor := StreamServerInterceptor(limiter)
called := false
handler := func(srv any, stream grpc.ServerStream) error {
called = true
return errors.New(errMsgFake)
}
info := &grpc.StreamServerInfo{
FullMethod: "FakeMethod",
}
err := interceptor(nil, &mockGRPCServerStream{ctx: ctx}, info, handler)
expErr := status.Errorf(
codes.ResourceExhausted,
"%s is rejected by grpc_ratelimit middleware, please retry later. %s",
info.FullMethod,
"rate limit exceeded",
)
assert.EqualError(t, err, expErr.Error())
assert.False(t, called)
}
func TestUnaryClientInterceptor_RateLimitPass(t *testing.T) {
limiter := new(mockContextBasedLimiter)
ctx := context.WithValue(context.Background(), ctxKeyShouldLimit, false)
interceptor := UnaryClientInterceptor(limiter)
invoker := func(ctx context.Context, method string, req, reply any, cc *grpc.ClientConn, opts ...grpc.CallOption) error {
return errors.New(errMsgFake)
}
err := interceptor(ctx, "FakeMethod", nil, nil, nil, invoker)
assert.EqualError(t, err, errMsgFake)
}
func TestStreamClientInterceptor_RateLimitPass(t *testing.T) {
limiter := new(mockContextBasedLimiter)
ctx := context.WithValue(context.Background(), ctxKeyShouldLimit, false)
interceptor := StreamClientInterceptor(limiter)
invoker := func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, opts ...grpc.CallOption) (grpc.ClientStream, error) {
return nil, errors.New(errMsgFake)
}
_, err := interceptor(ctx, nil, nil, "FakeMethod", invoker)
assert.EqualError(t, err, errMsgFake)
}
func TestUnaryClientInterceptor_RateLimitFail(t *testing.T) {
limiter := new(mockContextBasedLimiter)
ctx := context.WithValue(context.Background(), ctxKeyShouldLimit, true)
interceptor := UnaryClientInterceptor(limiter)
called := false
invoker := func(ctx context.Context, method string, req, reply any, cc *grpc.ClientConn, opts ...grpc.CallOption) error {
called = true
return errors.New(errMsgFake)
}
err := interceptor(ctx, "FakeMethod", nil, nil, nil, invoker)
expErr := status.Errorf(
codes.ResourceExhausted,
"%s is rejected by grpc_ratelimit middleware, please retry later. %s",
"FakeMethod",
"rate limit exceeded",
)
assert.EqualError(t, err, expErr.Error())
assert.False(t, called)
}
func TestStreamClientInterceptor_RateLimitFail(t *testing.T) {
limiter := new(mockContextBasedLimiter)
ctx := context.WithValue(context.Background(), ctxKeyShouldLimit, true)
interceptor := StreamClientInterceptor(limiter)
called := false
invoker := func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, opts ...grpc.CallOption) (grpc.ClientStream, error) {
called = true
return nil, errors.New(errMsgFake)
}
_, err := interceptor(ctx, nil, nil, "FakeMethod", invoker)
expErr := status.Errorf(
codes.ResourceExhausted,
"%s is rejected by grpc_ratelimit middleware, please retry later. %s",
"FakeMethod",
"rate limit exceeded",
)
assert.EqualError(t, err, expErr.Error())
assert.False(t, called)
}
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