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MCP Integration Guide

This document describes the integration of Modular Capability Providers (MCPs) into the distributed filesystem to evolve it into an IPFS + NFT-compatible system.

Overview

The following MCPs have been integrated:

  1. P2P Networking - libp2p
  2. DHT - Kademlia DHT
  3. Content Addressing - CID + Multihash
  4. Merkle DAG - IPLD
  5. Block Exchange - Bitswap
  6. CLI - Cobra
  7. Observability - Zap + Prometheus

1. P2P Networking (libp2p)

Purpose

Provides production-grade peer-to-peer networking with NAT traversal, secure connections, and multiple transport protocols.

Library Used

github.com/libp2p/go-libp2p

Interface Definition

type Host interface {
    ID() peer.ID
    Addrs() []ma.Multiaddr
    Connect(ctx context.Context, pi peer.AddrInfo) error
    Disconnect(pid peer.ID) error
    SetStreamHandler(pid protocol.ID, handler network.StreamHandler)
    NewStream(ctx context.Context, p peer.ID, pids ...protocol.ID) (network.Stream, error)
    Close() error
    Peerstore() peerstore.Peerstore
    Network() network.Network
}

Integration Points

  • internal/p2p/host.go - Core P2P node implementation
  • internal/p2p/discovery.go - Peer discovery mechanisms
  • internal/p2p/streams.go - Stream management for file transfer

Code Snippet

// Create a new libp2p host
host, privKey, err := p2p.NewHostWithKey("/ip4/0.0.0.0/tcp/4001")
if err != nil {
    log.Fatal(err)
}
defer host.Close()

// Set stream handler
host.SetStreamHandler("/distribute/file-transfer/1.0.0", func(s network.Stream) {
    // Handle incoming file transfer
})

Concurrency Concerns

  • All libp2p operations are goroutine-safe
  • Stream handlers must be thread-safe
  • Use proper synchronization for shared state

Failure Scenarios

  • Network partitions
  • NAT traversal failures
  • Peer disconnections
  • Invalid message formats

2. DHT (Kademlia)

Purpose

Provides decentralized peer discovery and content routing.

Library Used

github.com/libp2p/go-libp2p-kad-dht

Interface Definition

type DHT interface {
    Bootstrap(ctx context.Context) error
    PutValue(ctx context.Context, key string, value []byte) error
    GetValue(ctx context.Context, key string) ([]byte, error)
    FindPeer(ctx context.Context, peerID peer.ID) (peer.AddrInfo, error)
    RoutingTable() interface{}
    Close() error
}

Integration Points

  • internal/dht/dht.go - DHT wrapper implementation
  • Integrated with P2P host for peer discovery

Code Snippet

// Create DHT with the P2P host
dhtConfig := dht.DHTConfig{
    Host: host,
    Mode: dht.ModeAutoServer,
}
d, err := dht.NewDHT(dhtConfig)
if err != nil {
    log.Fatal(err)
}
defer d.Close()

// Bootstrap the DHT
if err := d.Bootstrap(ctx); err != nil {
    log.Fatal(err)
}

Edge Cases

  • Bootstrap failures
  • DHT pollution attacks
  • Routing table inconsistencies

3. Content Addressing (CID + Multihash)

Purpose

Provides content-addressable storage with cryptographic hashing.

Libraries Used

  • github.com/ipfs/go-cid
  • github.com/multiformats/go-multihash

Interface Definition

type CID interface {
    String() string
    Bytes() []byte
    Hash() mh.Multihash
    Version() uint64
    Codec() uint64
    Equals(other CID) bool
    Validate() error
}

Integration Points

  • internal/cid/cid.go - CID wrapper implementation
  • Used by blockstore and DAG for content addressing

Code Snippet

// Create a CID from data
config := cid.DefaultCIDConfig()
c, err := cid.NewCID([]byte("hello world"), config)
if err != nil {
    log.Fatal(err)
}

fmt.Printf("CID: %s\n", c.String())

Edge Cases

  • Hash collisions
  • Invalid CID formats
  • Version compatibility

4. Merkle DAG (IPLD)

Purpose

Provides Merkle DAG structure for representing linked data.

Library Used

github.com/ipld/go-ipld-prime

Interface Definition

type Node interface {
    CID() cid.Cid
    RawData() []byte
    Links() []Link
    AddLink(name string, target cid.Cid) error
    RemoveLink(name string) error
}

type Builder interface {
    BuildNode(data []byte) (Node, error)
    BuildNodeWithLinks(data []byte, links []Link) (Node, error)
    BuildTree(nodes []Node) (Node, error)
}

Integration Points

  • internal/dag/builder.go - DAG builder implementation
  • Used for file and directory structures

Code Snippet

// Create a DAG builder
builder := dag.NewBuilder(ipld.LinkSystem{})

// Build a node
node, err := builder.BuildNode([]byte("file content"))
if err != nil {
    log.Fatal(err)
}

// Add a link
node.AddLink("child", childCID)

Edge Cases

  • Circular references
  • Missing linked nodes
  • Large DAG traversal

5. Block Exchange (Bitswap)

Purpose

Provides efficient block exchange protocol for distributing data.

Library Used

github.com/ipfs/go-bitswap (simplified implementation)

Interface Definition

type Bitswap interface {
    GetBlock(ctx context.Context, c cid.Cid) (*blockstore.Block, error)
    HasBlock(c cid.Cid)
    WantBlock(c cid.Cid)
    Close() error
}

type Exchange interface {
    FetchBlock(ctx context.Context, c cid.Cid) (*blockstore.Block, error)
    ProvideBlock(ctx context.Context, b *blockstore.Block) error
    RegisterProvider(c cid.Cid, provider peer.ID)
    GetProviders(c cid.Cid) []peer.ID
}

Integration Points

  • internal/bitswap/bitswap.go - Bitswap implementation
  • Works with blockstore for local storage

Code Snippet

// Create bitswap
bs, err := bitswap.NewBitswap(bitswap.BitswapConfig{
    Host:       host,
    Blockstore: blockstore,
})
if err != nil {
    log.Fatal(err)
}
defer bs.Close()

// Request a block
block, err := bs.GetBlock(ctx, cid)
if err != nil {
    log.Fatal(err)
}

Edge Cases

  • Network timeouts
  • Block validation
  • Provider discovery

6. CLI (Cobra)

Purpose

Provides a professional command-line interface.

Library Used

github.com/spf13/cobra

Integration Points

  • cmd/cli/main.go - CLI implementation

Code Snippet

var nodeCmd = &cobra.Command{
    Use:   "node",
    Short: "Start a storage node",
    RunE:  runNode,
}

func runNode(cmd *cobra.Command, args []string) error {
    listen, _ := cmd.Flags().GetString("listen")
    // Start node...
    return nil
}

7. Observability (Zap + Prometheus)

Purpose

Provides structured logging and metrics collection.

Libraries Used

  • go.uber.org/zap - Structured logging
  • prometheus/client_golang - Metrics

Interface Definition

type Logger interface {
    Debug(msg string, fields ...Field)
    Info(msg string, fields ...Field)
    Warn(msg string, fields ...Field)
    Error(msg string, fields ...Field)
    Fatal(msg string, fields ...Field)
    With(fields ...Field) Logger
    Sync() error
}

type Metrics interface {
    Counter(name string, labels map[string]string) Counter
    Gauge(name string, labels map[string]string) Gauge
    Histogram(name string, labels map[string]string) Histogram
    StartServer(addr string) error
    StopServer() error
}

Integration Points

  • internal/observability/logging.go - Logger implementation
  • internal/observability/metrics.go - Metrics implementation

Code Snippet

// Create logger
logger, err := observability.NewLogger(observability.LoggerConfig{
    Level:  "info",
    Format: "json",
})
if err != nil {
    log.Fatal(err)
}
defer logger.Sync()

// Log with fields
logger.Info("server started",
    observability.StringField("addr", ":4001"),
    observability.IntField("peers", 10),
)

// Create metrics
metrics := observability.NewMetrics(observability.MetricsConfig{
    Namespace: "distribute",
})

// Start metrics server
metrics.StartServer(":9090")

Architecture

┌─────────────────────────────────────────────────────────────┐
│                         CLI (Cobra)                          │
├─────────────────────────────────────────────────────────────┤
│                    Distributed Filesystem                    │
├─────────────────────────────────────────────────────────────┤
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐         │
│  │   P2P Node  │  │    DHT      │  │  Bitswap    │         │
│  │  (libp2p)   │  │ (Kademlia)  │  │             │         │
│  └─────────────┘  └─────────────┘  └─────────────┘         │
├─────────────────────────────────────────────────────────────┤
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐         │
│  │    CID      │  │  Blockstore │  │    DAG      │         │
│  │ (Multihash) │  │             │  │   (IPLD)    │         │
│  └─────────────┘  └─────────────┘  └─────────────┘         │
├─────────────────────────────────────────────────────────────┤
│  ┌─────────────┐  ┌─────────────┐                          │
│  │   Logger    │  │   Metrics   │                          │
│  │   (Zap)     │  │ (Prometheus)│                          │
│  └─────────────┘  └─────────────┘                          │
└─────────────────────────────────────────────────────────────┘

Usage Example

package main

import (
    "context"
    "fmt"
    "log"

    "github.com/hellodebojeet/Distribute/internal/p2p"
    "github.com/hellodebojeet/Distribute/internal/dht"
    "github.com/hellodebojeet/Distribute/internal/observability"
)

func main() {
    // Create logger
    logger := observability.NewDefaultLogger()
    defer logger.Sync()

    // Create P2P host
    host, _, err := p2p.NewHostWithKey("/ip4/0.0.0.0/tcp/4001")
    if err != nil {
        log.Fatal(err)
    }
    defer host.Close()

    logger.Info("host created",
        observability.StringField("id", host.ID().String()),
    )

    // Create DHT
    dhtConfig := dht.DHTConfig{
        Host: host.(*p2p.Host),
    }
    d, err := dht.NewDHT(dhtConfig)
    if err != nil {
        log.Fatal(err)
    }
    defer d.Close()

    // Bootstrap DHT
    if err := d.Bootstrap(context.Background()); err != nil {
        logger.Error("bootstrap failed", observability.ErrorField(err))
    }

    logger.Info("node started successfully")
}

Configuration

All MCPs support configuration through their respective config structs:

// P2P configuration
p2pConfig := p2p.HostConfig{
    ListenAddrs: []string{"/ip4/0.0.0.0/tcp/4001"},
    NATManager:  true,
    Relay:       true,
}

// DHT configuration
dhtConfig := dht.DHTConfig{
    Mode:        dht.ModeAutoServer,
    BucketSize:  20,
    Concurrency: 3,
}

// Logger configuration
loggerConfig := observability.LoggerConfig{
    Level:      "info",
    Format:     "json",
    OutputPath: "/var/log/distribute.log",
}

// Metrics configuration
metricsConfig := observability.MetricsConfig{
    Namespace: "distribute",
}

Testing

All interfaces are designed to be mockable for testing:

type MockHost struct {
    mock.Mock
}

func (m *MockHost) Connect(ctx context.Context, pi peer.AddrInfo) error {
    args := m.Called(ctx, pi)
    return args.Error(0)
}

Performance Considerations

  1. P2P: Connection pooling and stream multiplexing
  2. DHT: Caching and query optimization
  3. Blockstore: LRU caching for frequently accessed blocks
  4. DAG: Lazy loading of child nodes
  5. Bitswap: Batch requests and priority queuing

Security

  1. Transport Security: TLS 1.3 for all P2P connections
  2. Content Verification: CID-based content addressing ensures integrity
  3. Access Control: Interface-based authorization
  4. Audit Logging: Structured logging for all operations

Future Enhancements

  1. NFT Support: Add ERC-721 metadata support
  2. Smart Contracts: Integration with blockchain for access control
  3. Advanced DAG: Support for UnixFS and other DAG formats
  4. Performance: GPU acceleration for hashing
  5. Monitoring: Distributed tracing with OpenTelemetry