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package consistency
import (
"context"
"strings"
"google.golang.org/grpc"
datastoremw "github.com/authzed/spicedb/internal/middleware/datastore"
"github.com/authzed/spicedb/pkg/datastore"
)
// ForceFullConsistencyUnaryServerInterceptor returns a new unary server interceptor that enforces full consistency
// for all requests, except for those in the bypassServiceWhitelist.
func ForceFullConsistencyUnaryServerInterceptor(serviceLabel string) grpc.UnaryServerInterceptor {
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
for bypass := range bypassServiceWhitelist {
if strings.HasPrefix(info.FullMethod, bypass) {
return handler(ctx, req)
}
}
ds := datastoremw.MustFromContext(ctx)
newCtx := ContextWithHandle(ctx)
if err := setFullConsistencyRevisionToContext(newCtx, req, ds, serviceLabel); err != nil {
return nil, err
}
return handler(newCtx, req)
}
}
// ForceFullConsistencyStreamServerInterceptor returns a new stream server interceptor that enforces full consistency
// for all requests, except for those in the bypassServiceWhitelist.
func ForceFullConsistencyStreamServerInterceptor(serviceLabel string) grpc.StreamServerInterceptor {
return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
for bypass := range bypassServiceWhitelist {
if strings.HasPrefix(info.FullMethod, bypass) {
return handler(srv, stream)
}
}
wrapper := &recvWrapper{stream, ContextWithHandle(stream.Context()), serviceLabel, setFullConsistencyRevisionToContext}
return handler(srv, wrapper)
}
}
func setFullConsistencyRevisionToContext(ctx context.Context, req interface{}, ds datastore.Datastore, serviceLabel string) error {
handle := ctx.Value(revisionKey)
if handle == nil {
return nil
}
switch req.(type) {
case hasConsistency:
if serviceLabel != "" {
ConsistencyCounter.WithLabelValues("full", "request", serviceLabel).Inc()
}
databaseRev, err := ds.HeadRevision(ctx)
if err != nil {
return rewriteDatastoreError(ctx, err)
}
handle.(*revisionHandle).revision = databaseRev
}
return nil
}
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