# Microservices Architecture

## 1.1 Overview

{% hint style="info" %}
The microservices architecture of CapsureLabs is structured to support scalability, modularity, and resilience. By decomposing the platform into loosely coupled services, each responsible for a distinct function, the architecture enables seamless feature updates, independent scaling, and improved fault isolation. This approach allows CapsureLabs to handle high volumes of requests efficiently, while ensuring that core functionalities remain unaffected by changes or failures in other areas.

Each microservice in the CapsureLabs ecosystem is dedicated to a specific function, such as user management, asset tracking, trading analysis, or NFT minting, and communicates with others via secure protocols such as RESTful APIs or gRPC.
{% endhint %}

***

## 1.2 Structure of Microservices

The CapsureLabs microservices architecture is divided into several key services, each organized by function:

{% tabs %}
{% tab title="User Service" %}
Manages user data, authentication, and access control.
{% endtab %}

{% tab title="NFT Service" %}
Handles NFT creation, metadata management, and integration with blockchain for minting and trading.
{% endtab %}

{% tab title="Trading Service" %}
Provides analytical tools, trading bots, arbitrage scanning, and yield optimization for investors.
{% endtab %}

{% tab title="Creator Service" %}
Supports NFT creation, virtual galleries, and IP protection tools for artists.
{% endtab %}

{% tab title="Developer Service" %}
Offers toolkits, debugging tools, and gas fee optimizers for Web3 developers.
{% endtab %}

{% tab title="DAO Service" %}
Manages decentralized governance, voting, and community incentive structures.
{% endtab %}

{% tab title="Notification Service" %}
Sends user alerts, event notifications, and system messages for various events across the platform.
{% endtab %}
{% endtabs %}

Each of these services is deployed independently and communicates with other services using secure, well-defined interfaces. The microservices structure is designed to support horizontal scaling, meaning each service can scale independently based on demand.

***

## 1.3 Service Communication

Communication between services is handled through two primary mechanisms:

{% tabs %}
{% tab title="REST API" %}
REST is used for standard HTTP communication, providing simple and scalable communication between internal services.
{% endtab %}

{% tab title="gRPC" %}
For performance-sensitive interactions, such as real-time data exchanges (e.g., trading bot updates or asset tracking), gRPC is employed due to its efficient protocol and binary format, which reduces latency.
{% endtab %}
{% endtabs %}

#### REST API Communication

A common scenario involves the User Service interacting with the NFT Service to fetch a user’s NFT assets. Here’s an example configuration for a REST API-based communication:

#### User Service Code for Fetching NFTs

```javascript
// Import dependencies
const axios = require('axios');

// Function to fetch user NFTs from the NFT service
async function fetchUserNFTs(userId) {
    try {
        const response = await axios.get(`http://nft-service.internal/api/nfts/user/${userId}`);
        return response.data;
    } catch (error) {
        console.error('Error fetching NFTs:', error);
        throw new Error('Unable to fetch user NFTs');
    }
}
```

#### gRPC Communication

For high-performance communication, CapsureLabs uses gRPC. In this example, the Trading Service sends real-time market data to the Analytics Service using gRPC.

Trading Service Code for Sending Market Data via gRPC

#### **Define gRPC Protocol** (`market.proto`)

```protobuf
syntax = "proto3";

package market;

service MarketDataService {
    rpc SendMarketData (MarketDataRequest) returns (MarketDataResponse);
}

message MarketDataRequest {
    string assetSymbol = 1;
    double price = 2;
    int64 timestamp = 3;
}

message MarketDataResponse {
    bool success = 1;
}
```

#### Trading Service Client Implementation

```javascript
const grpc = require('grpc');
const protoLoader = require('@grpc/proto-loader');

// Load protocol definition
const PROTO_PATH = './market.proto';
const packageDefinition = protoLoader.loadSync(PROTO_PATH, {});
const marketProto = grpc.loadPackageDefinition(packageDefinition).market;

// Define client
const client = new marketProto.MarketDataService('analytics-service:50051', grpc.credentials.createInsecure());

// Function to send market data
function sendMarketData(assetSymbol, price, timestamp) {
    const request = { assetSymbol, price, timestamp };
    client.SendMarketData(request, (error, response) => {
        if (error) {
            console.error('Error sending market data:', error);
            return;
        }
        console.log('Market data sent successfully:', response.success);
    });
}
```

In this example, **Trading Service** sends market data to the **Analytics Service** via gRPC, providing a low-latency communication path for real-time updates.

***

## 1.4 Service Discovery and Load Balancing

To ensure that services can dynamically locate and communicate with each other, CapsureLabs employs a **service discovery** mechanism. This mechanism uses a registry where services register themselves upon startup, and other services can query this registry to locate the necessary endpoints. This registry enables load balancing and supports scaling up instances of high-demand services.

{% tabs %}
{% tab title="Consul or etcd" %}
For service discovery and health checks.
{% endtab %}

{% tab title="Load Balancers" %}
NGINX or AWS Elastic Load Balancer (ELB) routes requests to appropriate service instances.
{% endtab %}
{% endtabs %}

***

## 1.5 Data Management and Persistence

Each microservice is responsible for managing its own data and database. This design follows the database-per-service pattern, which isolates each service’s data to reduce dependencies. For shared data, each service either directly queries or requests access from the data-owning service.

***

## 1.6 Error Handling and Resilience

To ensure that the system remains stable, CapsureLabs implements

{% tabs %}
{% tab title="Circuit Breakers" %}
Circuit breaker patterns prevent cascading failures by monitoring service health and disabling calls to failing services.
{% endtab %}

{% tab title="Retries and Timeouts" %}
Network calls include retries with exponential backoff and timeouts to prevent long wait times.
{% endtab %}

{% tab title="Centralized Logging" %}
Logs from each service are centrally collected to facilitate monitoring and troubleshooting.
{% endtab %}
{% endtabs %}


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