mirror of
https://github.com/AdguardTeam/AdGuardDNS.git
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125 lines
3.1 KiB
Go
125 lines
3.1 KiB
Go
package backendpb
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import (
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"context"
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"fmt"
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"net/url"
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"time"
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"github.com/AdguardTeam/AdGuardDNS/internal/remotekv"
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"github.com/AdguardTeam/golibs/errors"
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"google.golang.org/protobuf/types/known/durationpb"
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)
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// RemoteKVConfig is the configuration for the business logic backend key-value
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// storage.
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type RemoteKVConfig struct {
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// Metrics is used for the collection of the backend remote key-value
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// storage statistics.
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Metrics RemoteKVMetrics
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// GRPCMetrics is used for the collection of the protobuf communication
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// statistics.
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GRPCMetrics GRPCMetrics
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// Endpoint is the backend API URL. The scheme should be either "grpc" or
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// "grpcs".
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Endpoint *url.URL
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// APIKey is the API key used for authentication, if any.
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APIKey string
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// TTL is the TTL of the values in the storage.
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TTL time.Duration
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}
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// RemoteKV is the implementation of the [remotekv.Interface] interface that
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// uses the business logic backend as the key-value storage. It is safe for
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// concurrent use.
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type RemoteKV struct {
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grpcMetrics GRPCMetrics
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metrics RemoteKVMetrics
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client RemoteKVServiceClient
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apiKey string
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ttl time.Duration
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}
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// NewRemoteKV returns a new [RemoteKV] that retrieves information from the
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// business logic backend.
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func NewRemoteKV(c *RemoteKVConfig) (kv *RemoteKV, err error) {
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client, err := newClient(c.Endpoint)
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if err != nil {
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// Don't wrap the error, because it's informative enough as is.
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return nil, err
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}
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return &RemoteKV{
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grpcMetrics: c.GRPCMetrics,
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metrics: c.Metrics,
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client: NewRemoteKVServiceClient(client),
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apiKey: c.APIKey,
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ttl: c.TTL,
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}, nil
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}
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// type check
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var _ remotekv.Interface = (*RemoteKV)(nil)
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// Get implements the [remotekv.Interface] interface for *RemoteKV.
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func (kv *RemoteKV) Get(ctx context.Context, key string) (val []byte, ok bool, err error) {
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req := &RemoteKVGetRequest{
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Key: key,
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}
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ctx = ctxWithAuthentication(ctx, kv.apiKey)
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start := time.Now()
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resp, err := kv.client.Get(ctx, req)
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if err != nil {
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err = fmt.Errorf("getting %q key: %w", key, fixGRPCError(ctx, kv.grpcMetrics, err))
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return nil, false, err
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}
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kv.metrics.ObserveOperation(ctx, RemoteKVOpGet, time.Since(start))
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defer func() { kv.metrics.IncrementLookups(ctx, ok) }()
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received := resp.GetValue()
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switch received := received.(type) {
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case *RemoteKVGetResponse_Data:
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return received.Data, true, nil
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case *RemoteKVGetResponse_Empty:
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return nil, false, nil
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default:
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return nil, false, fmt.Errorf(
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"getting %q key: response type: %w: %T(%[3]v)",
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key,
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errors.ErrBadEnumValue,
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received,
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)
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}
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}
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// Set implements the [remotekv.Interface] interface for *RemoteKV.
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func (kv *RemoteKV) Set(ctx context.Context, key string, val []byte) (err error) {
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req := &RemoteKVSetRequest{
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Key: key,
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Data: val,
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Ttl: durationpb.New(kv.ttl),
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}
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ctx = ctxWithAuthentication(ctx, kv.apiKey)
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start := time.Now()
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_, err = kv.client.Set(ctx, req)
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if err != nil {
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return fmt.Errorf("setting %q key: %w", key, fixGRPCError(ctx, kv.grpcMetrics, err))
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}
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kv.metrics.ObserveOperation(ctx, RemoteKVOpSet, time.Since(start))
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return nil
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}
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