artifacts.go

Overview

The artifacts.go file defines the Artifact Interface Adapter that bridges the agent-level artifact access with the underlying artifact storage service implementations. Its primary function is to provide a context-aware wrapper around the artifact.Service interface, embedding necessary metadata such as application name, user ID, and session ID into every artifact operation.

This adapter enables agents and tools to perform artifact operations—saving, loading, loading specific versions, and listing artifacts—without managing contextual metadata explicitly. It implements the agent.Artifacts interface, allowing seamless integration within agent workflows and session contexts.

The file is part of the broader Artifact Management topic, which provides the core artifact storage and retrieval services with support for versioning and multi-tenant isolation.

Detailed Explanation

Struct: Artifacts

type Artifacts struct {
    Service   artifact.Service
    AppName   string
    UserID    string
    SessionID string
}

• Purpose:
  Represents a scoped adapter to an underlying artifact storage service. It holds the context identifiers (AppName, UserID, SessionID) that define the artifact namespace for all operations.

• Fields:

  • Service (artifact.Service): The backend service used to perform actual artifact operations.

  • AppName (string): Identifier of the application or system.

  • UserID (string): Identifier of the user owning the artifacts.

  • SessionID (string): Identifier of the session within which artifacts are scoped.

• Usage:
  Instantiate an Artifacts struct by supplying a concrete artifact.Service implementation and the relevant contextual identifiers for the current user session. This struct then exposes methods to manipulate artifacts within that scoped namespace.

Method: Save

func (a *Artifacts) Save(ctx context.Context, name string, data *genai.Part) (*artifact.SaveResponse, error)

• Purpose:
  Saves artifact data under the given name, associating it with the adapter's context.

• Parameters:

  • ctx (context.Context): Standard context for request scoping, cancellation, and deadlines.

  • name (string): The logical filename of the artifact to save.

  • data (*genai.Part): Content of the artifact. Supports binary or textual payloads.

• Returns:

  • *artifact.SaveResponse: Response containing metadata such as the assigned artifact version.

  • error: Non-nil if the save operation failed.

• Behavior:
  Constructs an artifact.SaveRequest populated with the adapter's AppName, UserID, SessionID, the filename, and the artifact payload, then delegates the save operation to the underlying artifact.Service.

• Example Usage:

resp, err := artifacts.Save(ctx, "example.txt", &genai.Part{Text: "Hello World"})
if err != nil {
    // handle error
}
// resp.Version contains the saved version number

Method: Load

func (a *Artifacts) Load(ctx context.Context, name string) (*artifact.LoadResponse, error)

• Purpose:
  Loads the latest version of the specified artifact within the adapter's context.

• Parameters:

  • ctx (context.Context): Request context.

  • name (string): Name of the artifact to load.

• Returns:

  • *artifact.LoadResponse: Contains the artifact data and metadata.

  • error: Non-nil if the load operation failed or artifact not found.

• Behavior:
  Creates an artifact.LoadRequest with contextual metadata and filename, then calls the underlying service's Load method.

• Example Usage:

loadResp, err := artifacts.Load(ctx, "example.txt")
if err != nil {
    // handle error
}
// loadResp.Part contains the loaded artifact data

Method: LoadVersion

func (a *Artifacts) LoadVersion(ctx context.Context, name string, version int) (*artifact.LoadResponse, error)

• Purpose:
  Loads a specific version of an artifact by filename and version number.

• Parameters:

  • ctx (context.Context): Request context.

  • name (string): Artifact filename.

  • version (int): Specific version number to load.

• Returns:

  • *artifact.LoadResponse: Contains the requested artifact version.

  • error: Non-nil if version does not exist or loading failed.

• Behavior:
  Similar to Load, but includes the Version field in the request to retrieve a particular artifact version.

• Example Usage:

versionResp, err := artifacts.LoadVersion(ctx, "example.txt", 3)
if err != nil {
    // handle error
}
// versionResp.Part contains artifact data of version 3

Method: List

func (a *Artifacts) List(ctx context.Context) (*artifact.ListResponse, error)

• Purpose:
  Lists all artifact filenames available under the current adapter's contextual scope.

• Parameters:

  • ctx (context.Context): Request context.

• Returns:

  • *artifact.ListResponse: Contains a list of artifact filenames.

  • error: Non-nil if listing failed.

• Behavior:
  Builds an artifact.ListRequest using the adapter's context and calls the underlying service to retrieve the list of artifact names.

• Example Usage:

listResp, err := artifacts.List(ctx)
if err != nil {
    // handle error
}
// listResp.FileNames contains artifact names

Implementation Details and Algorithms

• The adapter does not implement storage or versioning logic itself. Instead, it delegates all core operations to the injected artifact.Service backend, ensuring separation of concerns.

• The contextual fields (AppName, UserID, SessionID) are consistently embedded into every request to enforce multi-tenancy and session scoping.

• Versioning is handled downstream by the service implementations (e.g., in-memory or GCS backends) according to Artifact Management.

• This design simplifies agent and tool code by abstracting away context management and allowing them to focus on artifact names and content only.

• The adapter satisfies the agent.Artifacts interface, guaranteeing compatibility with the agent framework's expectations for artifact access.

Interaction with Other System Components

• Artifact Service Backends:
  The adapter depends on implementations of artifact.Service (e.g., in-memory or Google Cloud Storage) to perform actual persistence and retrieval of artifact data.

• Agent Framework:
  Implements the agent.Artifacts interface, enabling agents and tools to use this adapter transparently within agent workflows and sessions.

• Session and User Context:
  The adapter uses session and user identifiers to scope artifact operations, aligning with session management concepts (Session Management) to ensure artifact isolation and correct multi-user behavior.

• Tools and Workflows:
  Tools like artifact loaders or savers use this adapter to access artifacts within the proper scope during agent execution (Tooling System, Agent Workflow Management).

Class Diagram Representing Structure and Relationships

classDiagram
class Artifacts {
- Service: artifact.Service
- AppName: string
- UserID: string
- SessionID: string
+ Save(ctx, name, data) *artifact.SaveResponse
+ Load(ctx, name) *artifact.LoadResponse
+ LoadVersion(ctx, name, version) *artifact.LoadResponse
+ List(ctx) *artifact.ListResponse
}
class artifact.Service {
<<interface>>
+ Save(ctx, req) *artifact.SaveResponse
+ Load(ctx, req) *artifact.LoadResponse
+ List(ctx, req) *artifact.ListResponse
}
class agent.Artifacts {
<<interface>>
+ Save(ctx, name, data) *artifact.SaveResponse
+ Load(ctx, name) *artifact.LoadResponse
+ LoadVersion(ctx, name, version) *artifact.LoadResponse
+ List(ctx) *artifact.ListResponse
}
Artifacts ..|> agent.Artifacts
Artifacts --> artifact.Service : delegates calls

References

• Artifact Management: Handles core artifact storage, versioning, and retrieval logic, underlying this adapter. See Artifact Management.

• Agent Artifacts Interface: Defines the contract this adapter implements to expose artifact operations to agents. See Artifact Interface Adapter.

• Session Management: Provides contextual identifiers used by this adapter to scope artifacts. See Session Management.

• Tooling System: Tools use this adapter to interact with artifacts during agent workflows. See Tooling System.