piotrkowalczuk/mnemosyne

package mnemosyned

import (
    "github.com/golang/protobuf/ptypes/wrappers"
    "github.com/piotrkowalczuk/mnemosyne/internal/cache"
    "github.com/piotrkowalczuk/mnemosyne/internal/cluster"
    "github.com/piotrkowalczuk/mnemosyne/internal/storage"
    "github.com/piotrkowalczuk/mnemosyne/mnemosynerpc"
    "go.uber.org/zap"
    "golang.org/x/net/context"
    "google.golang.org/grpc/codes"
    "google.golang.org/grpc/status"
)

type sessionManagerExists struct {
    spanner

    storage storage.Storage
    cache   *cache.Cache
    cluster *cluster.Cluster
    logger  *zap.Logger
}

func (sme *sessionManagerExists) Exists(ctx context.Context, req *mnemosynerpc.ExistsRequest) (*wrappers.BoolValue, error) {
    span, ctx := sme.span(ctx, "session-manager.exists")
    defer span.Finish()

    if req.AccessToken == "" {
        return nil, errMissingAccessToken
    }
    if node, ok := sme.cluster.GetOther(req.AccessToken); ok {
        if cluster.IsInternalRequest(ctx) {
            return nil, status.Errorf(codes.FailedPrecondition,
                "it should be final destination of exists request (%s), but found another node for it: %s",
                req.GetAccessToken(),
                node.Addr,
            )
        }
        sme.logger.Debug("exists request forwarded", zap.String("remote_addr", node.Addr), zap.String("access_token", req.AccessToken))
        return node.Client.Exists(ctx, req)
    }

    exists, err := sme.storage.Exists(ctx, req.AccessToken)
    if err != nil {
        return nil, err
    }

    return &wrappers.BoolValue{Value: exists}, nil
}