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[Rate-limit provider]: Add token bucket implementation of rate-limiter #386

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merged 9 commits into from
Jan 29, 2021
Merged

[Rate-limit provider]: Add token bucket implementation of rate-limiter #386

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224625a
Add tocken bucket implementation of rate-limiter
MalloZup Jan 23, 2021
96640c0
Update providers/tokenbucket/limiter.go
MalloZup Jan 28, 2021
f8fc1cb
Update providers/tokenbucket/examples_test.go
MalloZup Jan 28, 2021
f34fce1
Update providers/tokenbucket/limiter.go
MalloZup Jan 28, 2021
e58896c
Update providers/tokenbucket/limiter.go
MalloZup Jan 28, 2021
31d82c9
Update providers/tokenbucket/doc.go
MalloZup Jan 28, 2021
5f5036d
Update providers/tokenbucket/limiter.go
MalloZup Jan 28, 2021
2e2db6f
Update providers/tokenbucket/examples_test.go
MalloZup Jan 28, 2021
733f36f
Fix word and minor changes
MalloZup Jan 28, 2021
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1 change: 0 additions & 1 deletion go.sum
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,6 @@ github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/google/go-cmp v0.5.0 h1:/QaMHBdZ26BB3SSst0Iwl10Epc+xhTquomWX0oZEB6w=
github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/grpc-ecosystem/go-grpc-middleware v1.2.2 h1:FlFbCRLd5Jr4iYXZufAvgWN6Ao0JrI5chLINnUXDDr0=
github.com/opentracing/opentracing-go v1.1.0 h1:pWlfV3Bxv7k65HYwkikxat0+s3pV4bsqf19k25Ur8rU=
github.com/opentracing/opentracing-go v1.1.0/go.mod h1:UkNAQd3GIcIGf0SeVgPpRdFStlNbqXla1AfSYxPUl2o=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
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6 changes: 6 additions & 0 deletions providers/tokenbucket/doc.go
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@@ -0,0 +1,6 @@
package tokenbucket

/*
`tokenbucket` provides a small adapter required to use juju TockenBucket rate limiter for gRPC middlewares.
Please see examples for examples of use.
*/
30 changes: 30 additions & 0 deletions providers/tokenbucket/examples_test.go
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package tokenbucket

import (
grpc_ratelimit "github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/ratelimit"
"github.com/juju/ratelimit"
"google.golang.org/grpc"
)

// Hard-coded for simplicity sake, but make this configurable in your application.
const (
// Add 5 token per seconds.
rate = 5
// Capacity of bucket. allow only 40 requests.
tokenCapacity = 40
)

// Simple example of server initialization code.
func Example() {
limiter := TokenBucketInterceptor{}
limiter.tokenBucket = ratelimit.NewBucket(rate, int64(tokenCapacity))

_ = grpc.NewServer(
grpc.ChainUnaryInterceptor(
grpc_ratelimit.UnaryServerInterceptor(&limiter),
),
grpc.ChainStreamInterceptor(
grpc_ratelimit.StreamServerInterceptor(&limiter),
),
)
}
9 changes: 9 additions & 0 deletions providers/tokenbucket/go.mod
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module github.com/grpc-ecosystem/go-grpc-middleware/providers/tockenbucket/v2

go 1.15

require (
github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.0.0-rc.2.0.20210122204322-468f61573a34
github.com/juju/ratelimit v1.0.1
google.golang.org/grpc v1.35.0
)
112 changes: 112 additions & 0 deletions providers/tokenbucket/go.sum
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@@ -0,0 +1,112 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
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github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
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29 changes: 29 additions & 0 deletions providers/tokenbucket/limiter.go
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package tokenbucket

// Implement Limiter interface.

import (
"context"
"fmt"

"github.com/juju/ratelimit"
)

// TokenBucketInterceptor implement token bucket algorithm.
type TokenBucketInterceptor struct {
tokenBucket *ratelimit.Bucket
}

// Limit implements Limiter interface.
func (r *TokenBucketInterceptor) Limit(_ context.Context) error {
// Take one token per request. This call doesn't block.
tokenRes := r.tokenBucket.TakeAvailable(1)

// When rate limit reached, return specific error for the clients.
if tokenRes == 0 {
return fmt.Errorf("APP-XXX: reached Rate-Limiting %d", r.tokenBucket.Available())
}

// Rate limit isn't reached.
return nil
}