Efremenko Arhip
6d45406ee0
Wire the artifact storage foundation to HTTP.
- PUT /tasks/{id}/artifacts/{filename}: a worker streams a partial result;
the coordinator verifies lease ownership (foreign worker → 409), streams
the bytes to blob storage while hashing, and records the metadata. An
orphaned blob from a failed metadata insert is cleaned up.
- GET /artifacts/{id}/download: streams an artifact back with its content
type, length, and checksum.
- Ownership is read with a new non-locking TaskRepository.Get, so no row lock
is held across a long upload. Identity travels in X-Worker-ID / X-Task-Attempt
headers per the contract; upload/download bypass the short request timeout.
- docker-compose mounts ./data for durable artifact storage; smoke and
requests.http exercise an upload → foreign-409 → download round-trip.
81 lines
2.3 KiB
Go
81 lines
2.3 KiB
Go
package usecase
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import (
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"context"
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"io"
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"github.com/google/uuid"
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"github.com/emil28092005/SciMesh/coordinator/internal/domain"
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)
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// UploadArtifact stores a worker's partial-result bytes and records the metadata.
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type UploadArtifact struct {
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tasks TaskRepository
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artifacts ArtifactRepository
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blobs BlobStore
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clk Clock
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}
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func NewUploadArtifact(tasks TaskRepository, artifacts ArtifactRepository,
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blobs BlobStore, clk Clock) *UploadArtifact {
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return &UploadArtifact{tasks: tasks, artifacts: artifacts, blobs: blobs, clk: clk}
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}
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func (uc *UploadArtifact) Execute(ctx context.Context, in UploadArtifactInput) (*domain.Artifact, error) {
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task, err := uc.tasks.Get(ctx, in.TaskID)
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if err != nil {
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return nil, err
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}
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// Only the worker holding the current lease at this attempt may upload the
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// task's output — the coordinator never trusts an ownership claim on faith.
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if !task.IsLeaseHeldBy(in.WorkerID, in.Attempt) {
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return nil, domain.ErrLeaseConflict
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}
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taskID := task.ID
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art, err := domain.NewArtifact(task.JobID, &taskID, domain.ArtifactPartialResult,
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in.Filename, in.ContentType, uc.clk.Now())
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if err != nil {
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return nil, err
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}
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// Stream to storage first: size and checksum are measured here, by us, not
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// taken from the worker. A large shard never sits in memory.
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sum, size, err := uc.blobs.Put(ctx, art.StorageKey, in.Body)
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if err != nil {
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return nil, err
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}
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art.SetContent(sum, size)
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// Persist the record. If that fails the blob would be an orphan, so remove it.
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if err := uc.artifacts.Insert(ctx, art); err != nil {
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_ = uc.blobs.Delete(ctx, art.StorageKey)
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return nil, err
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}
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return art, nil
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}
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// DownloadArtifact returns an artifact's metadata together with a reader over
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// its bytes. The caller must close the reader.
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type DownloadArtifact struct {
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artifacts ArtifactRepository
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blobs BlobStore
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}
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func NewDownloadArtifact(artifacts ArtifactRepository, blobs BlobStore) *DownloadArtifact {
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return &DownloadArtifact{artifacts: artifacts, blobs: blobs}
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}
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func (uc *DownloadArtifact) Execute(ctx context.Context, id uuid.UUID) (*domain.Artifact, io.ReadCloser, error) {
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a, err := uc.artifacts.Get(ctx, id)
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if err != nil {
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return nil, nil, err
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}
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rc, err := uc.blobs.Open(ctx, a.StorageKey)
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if err != nil {
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return nil, nil, err
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}
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return a, rc, nil
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}
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