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package tokencache
import (
"context"
"crypto"
"io"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/sassoftware/relic/v7/token"
"golang.org/x/time/rate"
)
var metricRateLimited = promauto.NewCounter(prometheus.CounterOpts{
Name: "token_operation_limited_seconds",
Help: "Cumulative number of seconds waiting for rate limits",
})
type RateLimited struct {
token.Token
limit *rate.Limiter
}
func NewLimiter(base token.Token, limit float64, burst int) *RateLimited {
if burst < 1 {
burst = 1
}
return &RateLimited{
Token: base,
limit: rate.NewLimiter(rate.Limit(limit), burst),
}
}
type rateLimitedKey struct {
token.Key
limit *rate.Limiter
}
func (r *RateLimited) GetKey(ctx context.Context, keyName string) (token.Key, error) {
start := time.Now()
if err := r.limit.Wait(ctx); err != nil {
return nil, err
}
if waited := time.Since(start); waited > 1*time.Millisecond {
metricRateLimited.Add(time.Since(start).Seconds())
}
key, err := r.Token.GetKey(ctx, keyName)
if err != nil {
return nil, err
}
return &rateLimitedKey{
Key: key,
limit: r.limit,
}, nil
}
func (k *rateLimitedKey) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) (sig []byte, err error) {
start := time.Now()
if err := k.limit.Wait(context.Background()); err != nil {
return nil, err
}
if waited := time.Since(start); waited > 1*time.Millisecond {
metricRateLimited.Add(time.Since(start).Seconds())
}
return k.Key.Sign(rand, digest, opts)
}
func (k *rateLimitedKey) SignContext(ctx context.Context, digest []byte, opts crypto.SignerOpts) (sig []byte, err error) {
start := time.Now()
if err := k.limit.Wait(ctx); err != nil {
return nil, err
}
if waited := time.Since(start); waited > 1*time.Millisecond {
metricRateLimited.Add(time.Since(start).Seconds())
}
return k.Key.SignContext(ctx, digest, opts)
}
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