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package cachedtvm
import (
"context"
"fmt"
"time"
"github.com/karlseguin/ccache/v2"
"a.yandex-team.ru/library/go/yandex/tvm"
)
const (
DefaultTTL = 1 * time.Minute
DefaultMaxItems = 100
MaxServiceTicketTTL = 5 * time.Minute
MaxUserTicketTTL = 1 * time.Minute
)
type CachedClient struct {
tvm.Client
serviceTicketCache cache
userTicketCache cache
userTicketFn func(ctx context.Context, ticket string, opts ...tvm.CheckUserTicketOption) (*tvm.CheckedUserTicket, error)
}
func NewClient(tvmClient tvm.Client, opts ...Option) (*CachedClient, error) {
newCache := func(o cacheOptions) cache {
return cache{
Cache: ccache.New(
ccache.Configure().MaxSize(o.maxItems),
),
ttl: o.ttl,
}
}
out := &CachedClient{
Client: tvmClient,
serviceTicketCache: newCache(cacheOptions{
ttl: DefaultTTL,
maxItems: DefaultMaxItems,
}),
userTicketFn: tvmClient.CheckUserTicket,
}
for _, opt := range opts {
switch o := opt.(type) {
case OptionServiceTicket:
if o.ttl > MaxServiceTicketTTL {
return nil, fmt.Errorf("maximum TTL for check service ticket exceed: %s > %s", o.ttl, MaxServiceTicketTTL)
}
out.serviceTicketCache = newCache(o.cacheOptions)
case OptionUserTicket:
if o.ttl > MaxUserTicketTTL {
return nil, fmt.Errorf("maximum TTL for check user ticket exceed: %s > %s", o.ttl, MaxUserTicketTTL)
}
out.userTicketFn = out.cacheCheckUserTicket
out.userTicketCache = newCache(o.cacheOptions)
default:
panic(fmt.Sprintf("unexpected cache option: %T", o))
}
}
return out, nil
}
func (c *CachedClient) CheckServiceTicket(ctx context.Context, ticket string) (*tvm.CheckedServiceTicket, error) {
out, err := c.serviceTicketCache.Fetch(ticket, func() (interface{}, error) {
return c.Client.CheckServiceTicket(ctx, ticket)
})
if err != nil {
return nil, err
}
return out.Value().(*tvm.CheckedServiceTicket), nil
}
func (c *CachedClient) CheckUserTicket(ctx context.Context, ticket string, opts ...tvm.CheckUserTicketOption) (*tvm.CheckedUserTicket, error) {
return c.userTicketFn(ctx, ticket, opts...)
}
func (c *CachedClient) cacheCheckUserTicket(ctx context.Context, ticket string, opts ...tvm.CheckUserTicketOption) (*tvm.CheckedUserTicket, error) {
cacheKey := func(ticket string, opts ...tvm.CheckUserTicketOption) string {
if len(opts) == 0 {
return ticket
}
var options tvm.CheckUserTicketOptions
for _, opt := range opts {
opt(&options)
}
if options.EnvOverride == nil {
return ticket
}
return fmt.Sprintf("%d:%s", *options.EnvOverride, ticket)
}
out, err := c.userTicketCache.Fetch(cacheKey(ticket, opts...), func() (interface{}, error) {
return c.Client.CheckUserTicket(ctx, ticket, opts...)
})
if err != nil {
return nil, err
}
return out.Value().(*tvm.CheckedUserTicket), nil
}
func (c *CachedClient) Close() {
c.serviceTicketCache.Stop()
c.userTicketCache.Stop()
}
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