121 lines
3.9 KiB
Go
121 lines
3.9 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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//go:build !enterprise
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package vault
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import (
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"context"
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"fmt"
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"strings"
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"github.com/hashicorp/vault/sdk/logical"
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)
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// Our forwarded writer has two components: a reference to Core, allowing
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// us to tap into the GRPC client and resolved paths, and lower storage
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// layer to call upon when we don't wish to forward our writes.
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//
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// This implementation lives in OSS: while the GRPC connection isn't present
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// on OSS, we need to ensure paths written to these forwarded nodes correctly
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// template {{clusterId}} if they are later upgraded to Enterprise, and don't
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// just write with the template sentinel still there.
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//
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// XXX: In the future, we'll need to support wrapping transactional storage.
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type ForwardedWriter struct {
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core *Core
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lower logical.Storage
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clusterID string
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}
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func (c *Core) NewForwardedWriter(ctx context.Context, wrapped logical.Storage, _ bool /* local */) (logical.Storage, error) {
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// local is unused above on this OSS implementation: local mounts only
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// exist on Vault Enterprise.
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// Cache the cluster id; we assume we'll be recreated when plugins reload
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// if this changes, and should not change without reloading plugins.
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cluster, err := c.Cluster(ctx)
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if err != nil || cluster.ID == "" {
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return nil, fmt.Errorf("failed to fetch local cluster info: %v", err)
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}
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return &ForwardedWriter{
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core: c,
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lower: wrapped,
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clusterID: cluster.ID,
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}, nil
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}
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func (w *ForwardedWriter) List(ctx context.Context, path string) ([]string, error) {
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// storage.List(...) operations are always handled locally. However, we
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// may need to resolve any {{clusterId}} template sentinels if given to us
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// and we'd otherwise consider this a forwarded write operation.
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var err error
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path, err = w.resolvePathIfNecessary(path)
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if err != nil {
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return nil, fmt.Errorf("failed to do local cross-cluster list: failed to resolve path: %w", err)
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}
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return w.lower.List(ctx, path)
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}
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func (w *ForwardedWriter) Get(ctx context.Context, path string) (*logical.StorageEntry, error) {
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// See note in List(...)above.
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var err error
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path, err = w.resolvePathIfNecessary(path)
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if err != nil {
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return nil, fmt.Errorf("failed to do local cross-cluster read: failed to resolve path: %w", err)
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}
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return w.lower.Get(ctx, path)
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}
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func (w *ForwardedWriter) Put(ctx context.Context, entry *logical.StorageEntry) error {
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// See note above about List(...).
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var err error
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entry.Key, err = w.resolvePathIfNecessary(entry.Key)
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if err != nil {
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return fmt.Errorf("failed to do local cross-cluster write: failed to resolve path: %w", err)
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}
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return w.lower.Put(ctx, entry)
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}
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func (w *ForwardedWriter) Delete(ctx context.Context, path string) error {
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// See note above about List(...).
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var err error
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path, err = w.resolvePathIfNecessary(path)
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if err != nil {
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return fmt.Errorf("failed to do local cross-cluster delete: failed to resolve path: %w", err)
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}
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return w.lower.Delete(ctx, path)
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}
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func (w *ForwardedWriter) resolvePathIfNecessary(path string) (string, error) {
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// We should only resolve this path when we're going to be servicing
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// it locally.
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//
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// We don't bother checking if we're a perf primary or not, as even
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// perf secondaries could use locally serviced operations on these paths
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// (e.g., a storage.List(...)).
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forwardablePath := w.core.writeForwardedPaths.HasPath(path)
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if forwardablePath {
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return w.resolvePath(path)
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}
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return path, nil
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}
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func (w *ForwardedWriter) resolvePath(path string) (string, error) {
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// This is the source-agnostic path resolution helper. Here we ensure
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// we've got a forwarded path (one that contains the proper UUID
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// sentinel) and we fetch this cluster's UUID and update the path.
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if !strings.Contains(path, logical.PBPWFClusterSentinel) {
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return "", fmt.Errorf("invalid path: lacks '%v' sentinel for expansion", logical.PBPWFClusterSentinel)
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}
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return strings.Replace(path, logical.PBPWFClusterSentinel, w.clusterID, 1), nil
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}
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