Add remote storage backend

This commit is contained in:
2026-05-16 14:22:04 +00:00
parent 0454296c81
commit 1e6db89dd4
16 changed files with 1016 additions and 11 deletions

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@@ -77,11 +77,35 @@ Current boundaries:
- local development audio (`audio_dir` / `audio_files`) still works
- `audio_dir`/`audio_files` and `audio_s3` are mutually exclusive
- no real S3 backend or AWS SDK integration yet
- real S3-compatible backend now exists in the storage adapter package
- storage backend tests use fake storage and do not require live S3
- no prepare-stage S3 list/download behavior yet
- no archive-stage S3 upload/promotion behavior yet
- no `current/manifest.json` or `current/run_id.txt` uploads yet
## Remote Storage Backend
Narratio includes an object-store backend layer for future prepare/archive work:
- `List(ctx, prefix)`
- `Download(ctx, key, localPath)`
- `Upload(ctx, localPath, key, opts)`
- `Exists(ctx, key)`
Implemented backends:
- fake storage backend for deterministic tests
- S3-compatible backend built from `pipeline.storage.s3`
Key invariant:
- callers pass full bucket-relative object keys
- storage backends do not prepend `root_prefix` and do not infer session/campaign paths
Current boundary:
- this backend layer is implemented but not yet wired into prepare-stage audio retrieval or archive-stage uploads
## Canonical Stage Order
1. `prepare`

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@@ -32,11 +32,15 @@ Implemented:
- S3 session/run/current key builders
- campaign/session/run local work/spool path helpers
- manifest run/path identity fields (`campaign`, `run_id`, local and S3 prefixes)
- remote storage backend layer:
- narrow object-store interface (`List`, `Download`, `Upload`, `Exists`)
- fake storage backend for deterministic tests (no network dependency)
- S3-compatible backend using AWS SDK v2
- config-based object-store construction helper
Still placeholder/future:
- `archive` stage behavior
- real S3 storage backend (list/download/upload/exists)
- prepare-stage S3 audio download behavior
- archive-stage S3 upload/promotion behavior
- `notify` stage behavior
@@ -157,6 +161,15 @@ Cross-config validation scope:
- `pipeline.storage.s3.bucket` is required only when an S3-dependent feature is explicitly configured (for current foundations, that includes `session.inputs.audio_s3`, and archive upload intent when using `storage.backend: s3`)
- no AWS credentials are stored in Narratio config; credential resolution remains an external runtime concern
Remote object-store backend scope:
- remote storage APIs are isolated to `internal/adapters/storage`
- AWS SDK types remain contained within the S3 backend implementation package
- S3 key/session path semantics remain outside the backend, with this invariant:
- callers pass full bucket-relative object keys
- backend methods do not prepend `root_prefix` or infer campaign/session/run paths
- the backend layer is available for future prepare/archive usage, but no stage currently invokes `List`/`Download`/`Upload`/`Exists`
`pipeline.scriptorium` is optional. Existing pipelines without Scriptorium continue to work.
`pipeline.trim` is optional. Existing pipelines without trim config continue to work.

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@@ -95,11 +95,14 @@ Implemented in repository:
- campaign/session/run local work and spool path helpers
- manifest run/path identity fields
- examples and tests for the above foundations
- remote storage backend layer:
- object-store abstraction with `List`, `Download`, `Upload`, and `Exists`
- fake storage backend for deterministic, no-network testing
- S3-compatible backend built from `storage.s3` config
- backend construction helper from resolved config
Not implemented yet:
- real S3 backend
- AWS SDK integration
- prepare-stage S3 list/download behavior
- archive-stage S3 upload behavior
- promotion uploads
@@ -849,9 +852,9 @@ Expected commit:
Add archive storage path configuration
```
### Storage Backend Interface and S3 Backend
### Storage Backend Interface and S3 Backend (Implemented)
Implement:
Implemented:
- storage backend interface
- object metadata type
@@ -859,7 +862,7 @@ Implement:
- real S3 backend using AWS SDK or existing project dependency policy
- backend construction from config
No stage behavior yet.
No prepare/archive stage behavior yet.
Expected commit:

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@@ -12,11 +12,14 @@ This runbook documents the currently implemented storage/archive foundations and
- promotion rule validation for safe relative paths
- run ID generation and path/key helper functions
- manifest run/path identity fields
- remote storage backend layer:
- object-store interface (`List`, `Download`, `Upload`, `Exists`)
- fake backend for deterministic tests
- S3-compatible backend using AWS SDK v2
- config-based backend construction helper
## Not Implemented Yet
- real S3 backend integration
- AWS SDK wiring
- prepare-stage S3 object listing or download
- archive-stage S3 upload or promotion writes
- writing `current/manifest.json` or `current/run_id.txt` in S3
@@ -29,4 +32,4 @@ This runbook documents the currently implemented storage/archive foundations and
## Next Implementation Target
Build the storage backend layer that can list/download/upload S3 objects through a fake-tested interface, then wire prepare/archive stages to use that backend.
Use the storage backend layer in prepare-stage session audio discovery/download flow, while preserving local audio input support.

58
docs/storage-backends.md Normal file
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@@ -0,0 +1,58 @@
# Storage Backends
This document describes the currently implemented remote object storage backend layer used by Narratio, and its intended role in later prepare/archive work.
## Implemented
Remote object store abstraction:
- `List(ctx, prefix)`
- `Download(ctx, key, localPath)`
- `Upload(ctx, localPath, key, opts)`
- `Exists(ctx, key)`
Object metadata model includes:
- key
- size
- ETag (provider metadata only)
- last modified time when available
Backends:
- fake storage backend for deterministic tests
- S3-compatible backend implemented with AWS SDK for Go v2
Construction:
- config-based constructor builds S3 backend from `pipeline.storage.s3` values:
- bucket
- region
- endpoint
- force_path_style
## Key Invariant
- callers pass full bucket-relative object keys
- storage backends do not prepend `root_prefix`
- storage backends do not infer campaign/session/run paths
S3 session/run key builders remain separate and continue to live outside backend implementations.
## Security Boundary
- do not store AWS credentials in Narratio config
- AWS credentials are resolved through standard AWS SDK credential chains
- AWS SDK-specific types remain isolated to the storage adapter package
## Testing
- fake storage tests cover list/download/upload/exists and error paths
- S3 backend tests use injected fake S3 API clients
- tests do not require live S3 services, AWS credentials, or network access
## Not Implemented Yet
- prepare-stage S3 object listing or downloads
- archive-stage S3 uploads or promotion writes
- writing `current/manifest.json` or `current/run_id.txt` to S3

21
go.mod
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@@ -3,3 +3,24 @@ module gitea.maximumdirect.net/eric/narratio
go 1.25.0
require gopkg.in/yaml.v3 v3.0.1
require (
github.com/aws/aws-sdk-go-v2 v1.41.7 // indirect
github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.10 // indirect
github.com/aws/aws-sdk-go-v2/config v1.32.17 // indirect
github.com/aws/aws-sdk-go-v2/credentials v1.19.16 // indirect
github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.23 // indirect
github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.23 // indirect
github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.23 // indirect
github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.24 // indirect
github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.9 // indirect
github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.15 // indirect
github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.23 // indirect
github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.23 // indirect
github.com/aws/aws-sdk-go-v2/service/s3 v1.101.0 // indirect
github.com/aws/aws-sdk-go-v2/service/signin v1.0.11 // indirect
github.com/aws/aws-sdk-go-v2/service/sso v1.30.17 // indirect
github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.21 // indirect
github.com/aws/aws-sdk-go-v2/service/sts v1.42.1 // indirect
github.com/aws/smithy-go v1.25.1 // indirect
)

36
go.sum
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@@ -1,3 +1,39 @@
github.com/aws/aws-sdk-go-v2 v1.41.7 h1:DWpAJt66FmnnaRIOT/8ASTucrvuDPZASqhhLey6tLY8=
github.com/aws/aws-sdk-go-v2 v1.41.7/go.mod h1:4LAfZOPHNVNQEckOACQx60Y8pSRjIkNZQz1w92xpMJc=
github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.10 h1:gx1AwW1Iyk9Z9dD9F4akX5gnN3QZwUB20GGKH/I+Rho=
github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.10/go.mod h1:qqY157uZoqm5OXq/amuaBJyC9hgBCBQnsaWnPe905GY=
github.com/aws/aws-sdk-go-v2/config v1.32.17 h1:FpL4/758/diKwqbytU0prpuiu60fgXKUWCpDJtApclU=
github.com/aws/aws-sdk-go-v2/config v1.32.17/go.mod h1:OXqUMzgXytfoF9JaKkhrOYsyh72t9G+MJH8mMRaexOE=
github.com/aws/aws-sdk-go-v2/credentials v1.19.16 h1:r3RJBuU7X9ibt8RHbMjWE6y60QbKBiII6wSrXnapxSU=
github.com/aws/aws-sdk-go-v2/credentials v1.19.16/go.mod h1:6cx7zqDENJDbBIIWX6P8s0h6hqHC8Avbjh9Dseo27ug=
github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.23 h1:UuSfcORqNSz/ey3VPRS8TcVH2Ikf0/sC+Hdj400QI6U=
github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.23/go.mod h1:+G/OSGiOFnSOkYloKj/9M35s74LgVAdJBSD5lsFfqKg=
github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.23 h1:GpT/TrnBYuE5gan2cZbTtvP+JlHsutdmlV2YfEyNde0=
github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.23/go.mod h1:xYWD6BS9ywC5bS3sz9Xh04whO/hzK2plt2Zkyrp4JuA=
github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.23 h1:bpd8vxhlQi2r1hiueOw02f/duEPTMK59Q4QMAoTTtTo=
github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.23/go.mod h1:15DfR2nw+CRHIk0tqNyifu3G1YdAOy68RftkhMDDwYk=
github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.24 h1:OQqn11BtaYv1WLUowvcA30MpzIu8Ti4pcLPIIyoKZrA=
github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.24/go.mod h1:X5ZJyfwVrWA96GzPmUCWFQaEARPR7gCrpq2E92PJwAE=
github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.9 h1:FLudkZLt5ci0ozzgkVo8BJGwvqNaZbTWb3UcucAateA=
github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.9/go.mod h1:w7wZ/s9qK7c8g4al+UyoF1Sp/Z45UwMGcqIzLWVQHWk=
github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.15 h1:ieLCO1JxUWuxTZ1cRd0GAaeX7O6cIxnwk7tc1LsQhC4=
github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.15/go.mod h1:e3IzZvQ3kAWNykvE0Tr0RDZCMFInMvhku3qNpcIQXhM=
github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.23 h1:pbrxO/kuIwgEsOPLkaHu0O+m4fNgLU8B3vxQ+72jTPw=
github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.23/go.mod h1:/CMNUqoj46HpS3MNRDEDIwcgEnrtZlKRaHNaHxIFpNA=
github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.23 h1:03xatSQO4+AM1lTAbnRg5OK528EUg744nW7F73U8DKw=
github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.23/go.mod h1:M8l3mwgx5ToK7wot2sBBce/ojzgnPzZXUV445gTSyE8=
github.com/aws/aws-sdk-go-v2/service/s3 v1.101.0 h1:etqBTKY581iwLL/H/S2sVgk3C9lAsTJFeXWFDsDcWOU=
github.com/aws/aws-sdk-go-v2/service/s3 v1.101.0/go.mod h1:L2dcoOgS2VSgbPLvpak2NyUPsO1TBN7M45Z4H7DlRc4=
github.com/aws/aws-sdk-go-v2/service/signin v1.0.11 h1:TdJ+HdzOBhU8+iVAOGUTU63VXopcumCOF1paFulHWZc=
github.com/aws/aws-sdk-go-v2/service/signin v1.0.11/go.mod h1:R82ZRExE/nheo0N+T8zHPcLRTcH8MGsnR3BiVGX0TwI=
github.com/aws/aws-sdk-go-v2/service/sso v1.30.17 h1:7byT8HUWrgoRp6sXjxtZwgOKfhss5fW6SkLBtqzgRoE=
github.com/aws/aws-sdk-go-v2/service/sso v1.30.17/go.mod h1:xNWknVi4Ezm1vg1QsB/5EWpAJURq22uqd38U8qKvOJc=
github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.21 h1:+1Kl1zx6bWi4X7cKi3VYh29h8BvsCoHQEQ6ST9X8w7w=
github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.21/go.mod h1:4vIRDq+CJB2xFAXZ+YgGUTiEft7oAQlhIs71xcSeuVg=
github.com/aws/aws-sdk-go-v2/service/sts v1.42.1 h1:F/M5Y9I3nwr2IEpshZgh1GeHpOItExNM9L1euNuh/fk=
github.com/aws/aws-sdk-go-v2/service/sts v1.42.1/go.mod h1:mTNxImtovCOEEuD65mKW7DCsL+2gjEH+RPEAexAzAio=
github.com/aws/smithy-go v1.25.1 h1:J8ERsGSU7d+aCmdQur5Txg6bVoYelvQJgtZehD12GkI=
github.com/aws/smithy-go v1.25.1/go.mod h1:YE2RhdIuDbA5E5bTdciG9KrW3+TiEONeUWCqxX9i1Fc=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

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@@ -0,0 +1,29 @@
package storage
import (
"context"
"fmt"
"strings"
"gitea.maximumdirect.net/eric/narratio/internal/config"
)
// NewObjectStoreFromConfig constructs a remote object store from resolved config.
func NewObjectStoreFromConfig(ctx context.Context, cfg *config.Config) (ObjectStore, error) {
if cfg == nil || cfg.Pipeline == nil {
return nil, fmt.Errorf("pipeline config is required")
}
if strings.EqualFold(strings.TrimSpace(cfg.Pipeline.Storage.Backend), "s3") {
if cfg.Pipeline.Storage.S3 == nil {
return nil, fmt.Errorf("pipeline.storage.s3 is required when pipeline.storage.backend is s3")
}
return NewS3BackendFromConfig(ctx, *cfg.Pipeline.Storage.S3)
}
if cfg.Pipeline.Storage.S3 != nil && strings.TrimSpace(cfg.Pipeline.Storage.S3.Bucket) != "" {
return NewS3BackendFromConfig(ctx, *cfg.Pipeline.Storage.S3)
}
return nil, fmt.Errorf("no remote object store backend is configured")
}

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@@ -0,0 +1,56 @@
package storage
import (
"context"
"strings"
"testing"
"gitea.maximumdirect.net/eric/narratio/internal/config"
)
func TestNewObjectStoreFromConfigBuildsS3WhenBackendIsS3(t *testing.T) {
original := newS3Client
t.Cleanup(func() { newS3Client = original })
newS3Client = func(_ context.Context, _ s3ClientOptions) (s3API, error) {
return &fakeS3API{}, nil
}
store, err := NewObjectStoreFromConfig(context.Background(), &config.Config{
Pipeline: &config.PipelineConfig{
Storage: config.StorageConfig{
Backend: "s3",
S3: &config.StorageS3Config{
Bucket: "my-archive",
},
},
},
})
if err != nil {
t.Fatalf("NewObjectStoreFromConfig() error = %v", err)
}
if _, ok := store.(*S3Backend); !ok {
t.Fatalf("store type = %T, want *S3Backend", store)
}
}
func TestNewObjectStoreFromConfigRequiresS3ConfigWhenBackendIsS3(t *testing.T) {
_, err := NewObjectStoreFromConfig(context.Background(), &config.Config{
Pipeline: &config.PipelineConfig{
Storage: config.StorageConfig{Backend: "s3"},
},
})
if err == nil || !strings.Contains(err.Error(), "pipeline.storage.s3 is required") {
t.Fatalf("NewObjectStoreFromConfig() error = %v, want missing storage.s3 error", err)
}
}
func TestNewObjectStoreFromConfigNoRemoteBackendConfigured(t *testing.T) {
_, err := NewObjectStoreFromConfig(context.Background(), &config.Config{
Pipeline: &config.PipelineConfig{
Storage: config.StorageConfig{Backend: "local"},
},
})
if err == nil || !strings.Contains(err.Error(), "no remote object store backend is configured") {
t.Fatalf("NewObjectStoreFromConfig() error = %v, want no-backend error", err)
}
}

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@@ -1,6 +1,14 @@
package storage
import "context"
import (
"context"
"fmt"
"os"
"path/filepath"
"sort"
"strings"
"time"
)
// NoopBackend is a deterministic no-op archive/storage adapter.
type NoopBackend struct{}
@@ -18,6 +26,13 @@ type FakeBackend struct {
Requests []ArchiveRequest
Err error
Result ArchiveResult
Objects map[string]FakeObject
ListErr error
DownloadErr error
UploadErr error
ExistsErr error
}
// Archive records request and returns configured response.
@@ -38,3 +53,140 @@ func (f *FakeBackend) Archive(ctx context.Context, req ArchiveRequest) (ArchiveR
}
return res, nil
}
// FakeObject is a deterministic fake object-store record.
type FakeObject struct {
Key string
Data []byte
Metadata map[string]string
ETag string
LastModified *time.Time
}
// SeedObject inserts or replaces an object in the fake object store.
func (f *FakeBackend) SeedObject(obj FakeObject) {
if f.Objects == nil {
f.Objects = map[string]FakeObject{}
}
key := normalizeObjectKey(obj.Key)
obj.Key = key
obj.Data = append([]byte(nil), obj.Data...)
obj.Metadata = copyMetadata(obj.Metadata)
f.Objects[key] = obj
}
// List returns deterministic prefix-filtered objects.
func (f *FakeBackend) List(ctx context.Context, prefix string) ([]ObjectInfo, error) {
if err := ctx.Err(); err != nil {
return nil, err
}
if f.ListErr != nil {
return nil, f.ListErr
}
normalizedPrefix := normalizeObjectKey(prefix)
keys := make([]string, 0, len(f.Objects))
for key := range f.Objects {
if strings.HasPrefix(key, normalizedPrefix) {
keys = append(keys, key)
}
}
sort.Strings(keys)
out := make([]ObjectInfo, 0, len(keys))
for _, key := range keys {
obj := f.Objects[key]
out = append(out, ObjectInfo{
Key: obj.Key,
Size: int64(len(obj.Data)),
ETag: obj.ETag,
LastModified: obj.LastModified,
})
}
return out, nil
}
// Download writes one object to a local path.
func (f *FakeBackend) Download(ctx context.Context, key, localPath string) error {
if err := ctx.Err(); err != nil {
return err
}
if f.DownloadErr != nil {
return f.DownloadErr
}
if strings.TrimSpace(localPath) == "" {
return fmt.Errorf("download object: local path is required")
}
obj, ok := f.Objects[normalizeObjectKey(key)]
if !ok {
return fmt.Errorf("download object %q: %w", key, os.ErrNotExist)
}
if err := os.MkdirAll(filepath.Dir(localPath), 0o755); err != nil {
return fmt.Errorf("download object %q: create parent directory: %w", key, err)
}
if err := os.WriteFile(localPath, obj.Data, 0o644); err != nil {
return fmt.Errorf("download object %q: write local file: %w", key, err)
}
return nil
}
// Upload reads a local file and stores it under key.
func (f *FakeBackend) Upload(ctx context.Context, localPath, key string, opts UploadOptions) (ObjectInfo, error) {
if err := ctx.Err(); err != nil {
return ObjectInfo{}, err
}
if f.UploadErr != nil {
return ObjectInfo{}, f.UploadErr
}
if strings.TrimSpace(localPath) == "" {
return ObjectInfo{}, fmt.Errorf("upload object: local path is required")
}
if strings.TrimSpace(key) == "" {
return ObjectInfo{}, fmt.Errorf("upload object: key is required")
}
data, err := os.ReadFile(localPath)
if err != nil {
return ObjectInfo{}, fmt.Errorf("upload object %q from %q: %w", key, localPath, err)
}
normalizedKey := normalizeObjectKey(key)
now := time.Now().UTC()
obj := FakeObject{
Key: normalizedKey,
Data: data,
Metadata: copyMetadata(opts.Metadata),
LastModified: &now,
}
f.SeedObject(obj)
return ObjectInfo{
Key: normalizedKey,
Size: int64(len(data)),
LastModified: &now,
}, nil
}
// Exists checks object presence.
func (f *FakeBackend) Exists(ctx context.Context, key string) (bool, error) {
if err := ctx.Err(); err != nil {
return false, err
}
if f.ExistsErr != nil {
return false, f.ExistsErr
}
_, ok := f.Objects[normalizeObjectKey(key)]
return ok, nil
}
func copyMetadata(in map[string]string) map[string]string {
if len(in) == 0 {
return nil
}
out := make(map[string]string, len(in))
for k, v := range in {
out[k] = v
}
return out
}

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@@ -3,6 +3,9 @@ package storage
import (
"context"
"errors"
"os"
"path/filepath"
"strings"
"testing"
)
@@ -29,3 +32,84 @@ func TestFakeBackendError(t *testing.T) {
t.Fatal("expected error, got nil")
}
}
func TestFakeBackendListPrefixFiltering(t *testing.T) {
fake := &FakeBackend{}
fake.SeedObject(FakeObject{Key: "dnd/campaigns/forsaken/audio/a.flac", Data: []byte("a")})
fake.SeedObject(FakeObject{Key: "dnd/campaigns/forsaken/audio/b.flac", Data: []byte("b")})
fake.SeedObject(FakeObject{Key: "dnd/campaigns/other/audio/c.flac", Data: []byte("c")})
items, err := fake.List(context.Background(), "dnd/campaigns/forsaken/audio/")
if err != nil {
t.Fatalf("List() error = %v", err)
}
if len(items) != 2 {
t.Fatalf("List() len = %d, want 2", len(items))
}
if items[0].Key != "dnd/campaigns/forsaken/audio/a.flac" || items[1].Key != "dnd/campaigns/forsaken/audio/b.flac" {
t.Fatalf("List() keys = %#v", items)
}
}
func TestFakeBackendDownload(t *testing.T) {
fake := &FakeBackend{}
fake.SeedObject(FakeObject{Key: "audio/a.flac", Data: []byte("audio-a")})
dst := filepath.Join(t.TempDir(), "nested", "a.flac")
if err := fake.Download(context.Background(), "audio/a.flac", dst); err != nil {
t.Fatalf("Download() error = %v", err)
}
data, err := os.ReadFile(dst)
if err != nil {
t.Fatalf("ReadFile() error = %v", err)
}
if string(data) != "audio-a" {
t.Fatalf("downloaded content = %q, want %q", string(data), "audio-a")
}
}
func TestFakeBackendUploadAndExists(t *testing.T) {
fake := &FakeBackend{}
local := filepath.Join(t.TempDir(), "upload.txt")
if err := os.WriteFile(local, []byte("payload"), 0o644); err != nil {
t.Fatalf("WriteFile() error = %v", err)
}
info, err := fake.Upload(context.Background(), local, `runs\id\artifact.txt`, UploadOptions{
Metadata: map[string]string{"kind": "artifact"},
})
if err != nil {
t.Fatalf("Upload() error = %v", err)
}
if info.Key != "runs/id/artifact.txt" {
t.Fatalf("Upload() key = %q, want normalized key", info.Key)
}
ok, err := fake.Exists(context.Background(), "runs/id/artifact.txt")
if err != nil {
t.Fatalf("Exists() error = %v", err)
}
if !ok {
t.Fatal("Exists() = false, want true")
}
}
func TestFakeBackendObjectErrors(t *testing.T) {
fake := &FakeBackend{DownloadErr: errors.New("download fail"), UploadErr: errors.New("upload fail"), ListErr: errors.New("list fail"), ExistsErr: errors.New("exists fail")}
if _, err := fake.List(context.Background(), "x"); err == nil || !strings.Contains(err.Error(), "list fail") {
t.Fatalf("List() error = %v, want list fail", err)
}
if err := fake.Download(context.Background(), "x", filepath.Join(t.TempDir(), "x")); err == nil || !strings.Contains(err.Error(), "download fail") {
t.Fatalf("Download() error = %v, want download fail", err)
}
local := filepath.Join(t.TempDir(), "x.txt")
_ = os.WriteFile(local, []byte("x"), 0o644)
if _, err := fake.Upload(context.Background(), local, "x", UploadOptions{}); err == nil || !strings.Contains(err.Error(), "upload fail") {
t.Fatalf("Upload() error = %v, want upload fail", err)
}
if _, err := fake.Exists(context.Background(), "x"); err == nil || !strings.Contains(err.Error(), "exists fail") {
t.Fatalf("Exists() error = %v, want exists fail", err)
}
}

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package storage
import "strings"
func normalizeObjectKey(key string) string {
normalized := strings.ReplaceAll(strings.TrimSpace(key), "\\", "/")
return strings.TrimLeft(normalized, "/")
}

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@@ -0,0 +1,21 @@
package storage
import "testing"
func TestNormalizeObjectKey(t *testing.T) {
tests := []struct {
in string
want string
}{
{in: `dnd\campaigns\forsaken\a.flac`, want: "dnd/campaigns/forsaken/a.flac"},
{in: " /dnd/campaigns/forsaken/a.flac ", want: "dnd/campaigns/forsaken/a.flac"},
{in: "//dnd/campaigns/forsaken/a.flac", want: "dnd/campaigns/forsaken/a.flac"},
{in: "", want: ""},
}
for _, tt := range tests {
if got := normalizeObjectKey(tt.in); got != tt.want {
t.Fatalf("normalizeObjectKey(%q) = %q, want %q", tt.in, got, tt.want)
}
}
}

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@@ -0,0 +1,32 @@
package storage
import (
"context"
"time"
)
// ObjectStore is a remote object storage boundary used by future prepare/archive work.
//
// Key invariant:
// callers pass full bucket-relative object keys. Backend implementations do not
// infer Narratio session semantics and do not prepend root prefixes.
type ObjectStore interface {
List(ctx context.Context, prefix string) ([]ObjectInfo, error)
Download(ctx context.Context, key, localPath string) error
Upload(ctx context.Context, localPath, key string, opts UploadOptions) (ObjectInfo, error)
Exists(ctx context.Context, key string) (bool, error)
}
// ObjectInfo describes one object in remote storage.
type ObjectInfo struct {
Key string
Size int64
ETag string
LastModified *time.Time
}
// UploadOptions configures optional object upload metadata.
type UploadOptions struct {
Metadata map[string]string
ContentType string
}

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@@ -0,0 +1,241 @@
package storage
import (
"context"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"time"
awsconfig "github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/service/s3"
"github.com/aws/aws-sdk-go-v2/service/s3/types"
"github.com/aws/smithy-go"
"gitea.maximumdirect.net/eric/narratio/internal/config"
)
type s3API interface {
ListObjectsV2(ctx context.Context, params *s3.ListObjectsV2Input, optFns ...func(*s3.Options)) (*s3.ListObjectsV2Output, error)
GetObject(ctx context.Context, params *s3.GetObjectInput, optFns ...func(*s3.Options)) (*s3.GetObjectOutput, error)
PutObject(ctx context.Context, params *s3.PutObjectInput, optFns ...func(*s3.Options)) (*s3.PutObjectOutput, error)
HeadObject(ctx context.Context, params *s3.HeadObjectInput, optFns ...func(*s3.Options)) (*s3.HeadObjectOutput, error)
}
// S3Backend is an ObjectStore implementation backed by S3-compatible APIs.
type S3Backend struct {
bucket string
client s3API
}
type s3ClientOptions struct {
Region string
Endpoint string
ForcePathStyle bool
}
var newS3Client = func(ctx context.Context, opts s3ClientOptions) (s3API, error) {
loadOpts := make([]func(*awsconfig.LoadOptions) error, 0, 1)
if strings.TrimSpace(opts.Region) != "" {
loadOpts = append(loadOpts, awsconfig.WithRegion(strings.TrimSpace(opts.Region)))
}
awsCfg, err := awsconfig.LoadDefaultConfig(ctx, loadOpts...)
if err != nil {
return nil, fmt.Errorf("load aws config: %w", err)
}
return s3.NewFromConfig(awsCfg, func(o *s3.Options) {
if strings.TrimSpace(opts.Endpoint) != "" {
endpoint := strings.TrimSpace(opts.Endpoint)
o.BaseEndpoint = &endpoint
}
o.UsePathStyle = opts.ForcePathStyle
}), nil
}
// NewS3BackendFromConfig builds an S3 backend from resolved config.
func NewS3BackendFromConfig(ctx context.Context, cfg config.StorageS3Config) (*S3Backend, error) {
bucket := strings.TrimSpace(cfg.Bucket)
if bucket == "" {
return nil, fmt.Errorf("storage.s3.bucket is required")
}
client, err := newS3Client(ctx, s3ClientOptions{
Region: cfg.Region,
Endpoint: cfg.Endpoint,
ForcePathStyle: cfg.ForcePathStyle,
})
if err != nil {
return nil, fmt.Errorf("build s3 client: %w", err)
}
return &S3Backend{
bucket: bucket,
client: client,
}, nil
}
// List returns objects under prefix.
func (b *S3Backend) List(ctx context.Context, prefix string) ([]ObjectInfo, error) {
normalizedPrefix := normalizeObjectKey(prefix)
out := make([]ObjectInfo, 0)
var token *string
for {
resp, err := b.client.ListObjectsV2(ctx, &s3.ListObjectsV2Input{
Bucket: &b.bucket,
Prefix: &normalizedPrefix,
ContinuationToken: token,
})
if err != nil {
return nil, fmt.Errorf("list objects under %q: %w", normalizedPrefix, err)
}
for _, item := range resp.Contents {
var lastModified *time.Time
if item.LastModified != nil {
t := *item.LastModified
lastModified = &t
}
out = append(out, ObjectInfo{
Key: normalizeObjectKey(valueOrEmpty(item.Key)),
Size: valueOrZeroInt64(item.Size),
ETag: strings.Trim(valueOrEmpty(item.ETag), "\""),
LastModified: lastModified,
})
}
if !valueOrFalseBool(resp.IsTruncated) || resp.NextContinuationToken == nil {
break
}
token = resp.NextContinuationToken
}
return out, nil
}
// Download retrieves one object to localPath, creating parent directories as needed.
func (b *S3Backend) Download(ctx context.Context, key, localPath string) error {
normalizedKey := normalizeObjectKey(key)
if strings.TrimSpace(localPath) == "" {
return fmt.Errorf("download object: local path is required")
}
resp, err := b.client.GetObject(ctx, &s3.GetObjectInput{
Bucket: &b.bucket,
Key: &normalizedKey,
})
if err != nil {
return fmt.Errorf("download object %q: %w", normalizedKey, err)
}
defer resp.Body.Close()
if err := os.MkdirAll(filepath.Dir(localPath), 0o755); err != nil {
return fmt.Errorf("download object %q: create parent directory: %w", normalizedKey, err)
}
dst, err := os.Create(localPath)
if err != nil {
return fmt.Errorf("download object %q: create local file: %w", normalizedKey, err)
}
defer dst.Close()
if _, err := io.Copy(dst, resp.Body); err != nil {
return fmt.Errorf("download object %q: copy body: %w", normalizedKey, err)
}
if err := dst.Sync(); err != nil {
return fmt.Errorf("download object %q: sync local file: %w", normalizedKey, err)
}
return nil
}
// Upload sends a local file to key.
func (b *S3Backend) Upload(ctx context.Context, localPath, key string, opts UploadOptions) (ObjectInfo, error) {
normalizedKey := normalizeObjectKey(key)
if strings.TrimSpace(localPath) == "" {
return ObjectInfo{}, fmt.Errorf("upload object: local path is required")
}
if normalizedKey == "" {
return ObjectInfo{}, fmt.Errorf("upload object: key is required")
}
file, err := os.Open(localPath)
if err != nil {
return ObjectInfo{}, fmt.Errorf("upload object %q from %q: %w", normalizedKey, localPath, err)
}
defer file.Close()
stat, err := file.Stat()
if err != nil {
return ObjectInfo{}, fmt.Errorf("upload object %q from %q: stat local file: %w", normalizedKey, localPath, err)
}
input := &s3.PutObjectInput{
Bucket: &b.bucket,
Key: &normalizedKey,
Body: file,
Metadata: copyMetadata(opts.Metadata),
}
if strings.TrimSpace(opts.ContentType) != "" {
ct := strings.TrimSpace(opts.ContentType)
input.ContentType = &ct
}
resp, err := b.client.PutObject(ctx, input)
if err != nil {
return ObjectInfo{}, fmt.Errorf("upload object %q from %q: %w", normalizedKey, localPath, err)
}
return ObjectInfo{
Key: normalizedKey,
Size: stat.Size(),
ETag: strings.Trim(valueOrEmpty(resp.ETag), "\""),
}, nil
}
// Exists checks whether one object key exists.
func (b *S3Backend) Exists(ctx context.Context, key string) (bool, error) {
normalizedKey := normalizeObjectKey(key)
_, err := b.client.HeadObject(ctx, &s3.HeadObjectInput{
Bucket: &b.bucket,
Key: &normalizedKey,
})
if err == nil {
return true, nil
}
var notFound *types.NotFound
if errors.As(err, &notFound) {
return false, nil
}
var apiErr smithy.APIError
if errors.As(err, &apiErr) {
switch apiErr.ErrorCode() {
case "NotFound", "NoSuchKey", "404":
return false, nil
}
}
return false, fmt.Errorf("head object %q: %w", normalizedKey, err)
}
func valueOrEmpty(v *string) string {
if v == nil {
return ""
}
return *v
}
func valueOrZeroInt64(v *int64) int64 {
if v == nil {
return 0
}
return *v
}
func valueOrFalseBool(v *bool) bool {
if v == nil {
return false
}
return *v
}

View File

@@ -0,0 +1,224 @@
package storage
import (
"context"
"io"
"os"
"path/filepath"
"strings"
"testing"
"time"
"github.com/aws/aws-sdk-go-v2/service/s3"
"github.com/aws/aws-sdk-go-v2/service/s3/types"
"github.com/aws/smithy-go"
"gitea.maximumdirect.net/eric/narratio/internal/config"
)
type fakeS3API struct {
listOut *s3.ListObjectsV2Output
listErr error
getBody io.ReadCloser
getErr error
putOut *s3.PutObjectOutput
putErr error
headErr error
lastList *s3.ListObjectsV2Input
lastGet *s3.GetObjectInput
lastPut *s3.PutObjectInput
lastHead *s3.HeadObjectInput
}
func (f *fakeS3API) ListObjectsV2(_ context.Context, params *s3.ListObjectsV2Input, _ ...func(*s3.Options)) (*s3.ListObjectsV2Output, error) {
f.lastList = params
if f.listErr != nil {
return nil, f.listErr
}
if f.listOut == nil {
return &s3.ListObjectsV2Output{}, nil
}
return f.listOut, nil
}
func (f *fakeS3API) GetObject(_ context.Context, params *s3.GetObjectInput, _ ...func(*s3.Options)) (*s3.GetObjectOutput, error) {
f.lastGet = params
if f.getErr != nil {
return nil, f.getErr
}
body := f.getBody
if body == nil {
body = io.NopCloser(strings.NewReader(""))
}
return &s3.GetObjectOutput{Body: body}, nil
}
func (f *fakeS3API) PutObject(_ context.Context, params *s3.PutObjectInput, _ ...func(*s3.Options)) (*s3.PutObjectOutput, error) {
f.lastPut = params
if f.putErr != nil {
return nil, f.putErr
}
if f.putOut == nil {
return &s3.PutObjectOutput{}, nil
}
return f.putOut, nil
}
func (f *fakeS3API) HeadObject(_ context.Context, params *s3.HeadObjectInput, _ ...func(*s3.Options)) (*s3.HeadObjectOutput, error) {
f.lastHead = params
if f.headErr != nil {
return nil, f.headErr
}
return &s3.HeadObjectOutput{}, nil
}
func TestS3BackendListAndKeyNormalization(t *testing.T) {
lastModified := time.Date(2026, 5, 16, 12, 0, 0, 0, time.UTC)
client := &fakeS3API{
listOut: &s3.ListObjectsV2Output{
Contents: []types.Object{
{Key: strPtr(`dnd\campaigns\forsaken\a.flac`), Size: int64Ptr(7), ETag: strPtr(`"abc"`), LastModified: &lastModified},
},
},
}
backend := &S3Backend{bucket: "bucket-1", client: client}
items, err := backend.List(context.Background(), `dnd\campaigns\`)
if err != nil {
t.Fatalf("List() error = %v", err)
}
if len(items) != 1 {
t.Fatalf("List() len = %d, want 1", len(items))
}
if items[0].Key != "dnd/campaigns/forsaken/a.flac" {
t.Fatalf("List() key = %q, want normalized slash key", items[0].Key)
}
if items[0].ETag != "abc" {
t.Fatalf("List() ETag = %q, want %q", items[0].ETag, "abc")
}
if client.lastList == nil || *client.lastList.Prefix != "dnd/campaigns/" {
t.Fatalf("List() prefix = %#v, want normalized prefix", client.lastList)
}
}
func TestS3BackendDownloadCreatesParentDirectory(t *testing.T) {
client := &fakeS3API{getBody: io.NopCloser(strings.NewReader("audio"))}
backend := &S3Backend{bucket: "bucket-1", client: client}
dst := filepath.Join(t.TempDir(), "nested", "clip.flac")
if err := backend.Download(context.Background(), `audio\clip.flac`, dst); err != nil {
t.Fatalf("Download() error = %v", err)
}
data, err := os.ReadFile(dst)
if err != nil {
t.Fatalf("ReadFile() error = %v", err)
}
if string(data) != "audio" {
t.Fatalf("downloaded content = %q, want %q", string(data), "audio")
}
if client.lastGet == nil || *client.lastGet.Key != "audio/clip.flac" {
t.Fatalf("GetObject key = %#v, want normalized key", client.lastGet)
}
}
func TestS3BackendUploadAndExists(t *testing.T) {
client := &fakeS3API{putOut: &s3.PutObjectOutput{ETag: strPtr(`"etag123"`)}}
backend := &S3Backend{bucket: "bucket-1", client: client}
local := filepath.Join(t.TempDir(), "artifact.txt")
if err := os.WriteFile(local, []byte("artifact"), 0o644); err != nil {
t.Fatalf("WriteFile() error = %v", err)
}
info, err := backend.Upload(context.Background(), local, `runs\id\artifact.txt`, UploadOptions{
Metadata: map[string]string{"kind": "artifact"},
})
if err != nil {
t.Fatalf("Upload() error = %v", err)
}
if info.Key != "runs/id/artifact.txt" {
t.Fatalf("Upload key = %q, want normalized key", info.Key)
}
if info.ETag != "etag123" {
t.Fatalf("Upload ETag = %q, want %q", info.ETag, "etag123")
}
if client.lastPut == nil || *client.lastPut.Key != "runs/id/artifact.txt" {
t.Fatalf("PutObject key = %#v, want normalized key", client.lastPut)
}
ok, err := backend.Exists(context.Background(), "runs/id/artifact.txt")
if err != nil {
t.Fatalf("Exists() error = %v", err)
}
if !ok {
t.Fatal("Exists() = false, want true")
}
}
func TestS3BackendUploadMissingLocalFile(t *testing.T) {
backend := &S3Backend{bucket: "bucket-1", client: &fakeS3API{}}
_, err := backend.Upload(context.Background(), filepath.Join(t.TempDir(), "missing.txt"), "key.txt", UploadOptions{})
if err == nil || !strings.Contains(err.Error(), "no such file") {
t.Fatalf("Upload() error = %v, want missing local file error", err)
}
}
func TestS3BackendExistsNotFound(t *testing.T) {
backend := &S3Backend{
bucket: "bucket-1",
client: &fakeS3API{
headErr: &smithy.GenericAPIError{Code: "NotFound", Message: "missing"},
},
}
ok, err := backend.Exists(context.Background(), "missing-key")
if err != nil {
t.Fatalf("Exists() error = %v", err)
}
if ok {
t.Fatal("Exists() = true, want false")
}
}
func TestNewS3BackendFromConfigUsesClientOptions(t *testing.T) {
original := newS3Client
t.Cleanup(func() { newS3Client = original })
var got s3ClientOptions
newS3Client = func(_ context.Context, opts s3ClientOptions) (s3API, error) {
got = opts
return &fakeS3API{}, nil
}
backend, err := NewS3BackendFromConfig(context.Background(), config.StorageS3Config{
Bucket: "my-archive",
Region: "us-east-1",
Endpoint: "http://localhost:9000",
ForcePathStyle: true,
})
if err != nil {
t.Fatalf("NewS3BackendFromConfig() error = %v", err)
}
if backend.bucket != "my-archive" {
t.Fatalf("backend.bucket = %q, want %q", backend.bucket, "my-archive")
}
if got.Region != "us-east-1" || got.Endpoint != "http://localhost:9000" || !got.ForcePathStyle {
t.Fatalf("client options = %#v, want region/endpoint/path-style values", got)
}
}
func TestNewS3BackendFromConfigRequiresBucket(t *testing.T) {
_, err := NewS3BackendFromConfig(context.Background(), config.StorageS3Config{})
if err == nil || !strings.Contains(err.Error(), "bucket is required") {
t.Fatalf("NewS3BackendFromConfig() error = %v, want bucket validation", err)
}
}
func strPtr(v string) *string { return &v }
func int64Ptr(v int64) *int64 { return &v }
var _ s3API = (*fakeS3API)(nil)