Context as Code Implementation Examples Across Popular Languages and Frameworks
The Evolution of Context Implementation
Remember when we used to rely solely on comments and documentation? Those days are gone. Modern context implementation is structured, machine-readable, and act
## The Evolution of Context Implementation
Remember when we used to rely solely on comments and documentation? Those days are gone. Modern context implementation is structured, machine-readable, and actionable. Let's explore how different languages and frameworks handle this evolution.
## Python Implementation
### FastAPI Example
from fastapi import FastAPI
from contextlib import contextmanager
@context(
domain="payment_processing",
security_level="high",
compliance=["PCI-DSS", "GDPR"],
team="financial_services"
)
class PaymentService(FastAPI):
def __init__(self):
super().__init__(
title="Payment API",
description="Handles secure payment processing"
)
self.context = self.load_operational_context()
@context_aware
async def process_payment(self, payment: Payment):
"""
Context-aware payment processing with automated security checks
"""
with self.audit_context():
return await self._process_secure_payment(payment)
### Django Implementation
from django.db import models
from django_context import ContextMixin
class Order(models.Model, ContextMixin):
context_config = {
"business_impact": "high",
"data_retention": "7_years",
"audit_required": True,
"owner": "sales_team"
}
@context_aware_transaction
def process(self):
with self.get_context() as ctx:
ctx.log_business_event("order_processing_started")
# Processing logic here
## JavaScript/TypeScript Examples
### Next.js Implementation
import { withContext } from 'next-context-wrapper';
interface PageContext {
securityLevel: 'high' | 'medium' | 'low';
dataHandling: string[];
userAccess: string[];
}
const DashboardPage = withContext<PageContext>()({
context: {
securityLevel: 'high',
dataHandling: ['PII', 'financial'],
userAccess: ['admin', 'manager']
},
component: ({ context, data }) => {
useEffect(() => {
context.audit.log('dashboard_access');
}, []);
return (
// Component implementation
);
}
});
### Express.js with Context
const express = require('express');
const { contextMiddleware } = require('./context');
const app = express();
// Global context middleware
app.use(contextMiddleware({
application: 'customer_portal',
monitoring: {
level: 'detailed',
metrics: ['performance', 'security', 'business']
}
}));
// Route-specific context
app.post('/api/users',
context({
operation: 'user_creation',
validation: ['email', 'identity'],
compliance: ['GDPR', 'CCPA']
}),
async (req, res) => {
// Handler implementation
}
);
## Java Implementation
### Spring Boot Example
@Service
@ContextConfiguration(
domain = "customer_management",
team = "crm",
sla = "99.99",
critical = true
)
public class CustomerService {
@ContextAware
@Transactional
public Customer updateProfile(ProfileUpdate update) {
try (var ctx = ContextScope.current()) {
ctx.audit("profile_update_initiated");
// Implementation
}
}
}
## Go Implementation
### Gin Framework Example
package main
import (
"github.com/gin-gonic/gin"
"context"
)
// Context definition
type ServiceContext struct {
Domain string
Team string
Importance string
Metrics []string
}
// Middleware implementation
func contextMiddleware() gin.HandlerFunc {
return func(c *gin.Context) {
ctx := ServiceContext{
Domain: "user_management",
Team: "identity",
Importance: "critical",
Metrics: []string{"latency", "error_rate"},
}
c.Set("context", ctx)
c.Next()
}
}
// Handler with context
func handleUserCreation(c *gin.Context) {
svcContext, _ := c.Get("context")
// Implementation using context
}
## Ruby on Rails Implementation
### Active Record with Context
class Order < ApplicationRecord
include ContextAware
context_config do
domain "e_commerce"
critical true
compliance %w[PCI SOX]
monitoring :high_priority
end
def process_payment
with_context do |ctx|
ctx.audit_trail.log("payment_initiated")
# Implementation
end
end
end
### Rails Controller Context
class PaymentsController < ApplicationController
include ContextualController
context_aware :process_payment,
domain: :financial,
security: :high,
audit: true
def process_payment
@payment = Payment.new(payment_params)
context.with_audit do
if @payment.save
context.log_business_event("payment_successful")
end
end
end
end
## Rust Implementation
### Actix Web Example
use actix_web::{web, App, HttpServer};
use context_aware::{Context, ContextAware};
#[derive(Context)]
struct ServiceContext {
domain: String,
security_level: SecurityLevel,
metrics: Vec<String>,
}
#[context_aware]
async fn handle_request(
data: web::Json<Request>,
context: ServiceContext,
) -> Result<HttpResponse> {
context.audit_log("request_received");
// Implementation
}
#[actix_web::main]
async fn main() -> std::io::Result<()> {
HttpServer::new(|| {
App::new()
.wrap(ContextMiddleware::new(ServiceContext {
domain: "api_gateway".to_string(),
security_level: SecurityLevel::High,
metrics: vec!["latency".to_string(), "errors".to_string()],
}))
.service(web::resource("/api").to(handle_request))
})
.bind("127.0.0.1:8080")?
.run()
.await
}
## Kubernetes Native Context
### Custom Resource Definition
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
name: servicecontexts.context.company.io
spec:
group: context.company.io
versions:
- name: v1
served: true
storage: true
schema:
openAPIV3Schema:
type: object
properties:
spec:
type: object
properties:
domain:
type: string
team:
type: string
sla:
type: string
security:
type: string
## GraphQL Context Implementation
### Apollo Server Example
import { ApolloServer } from 'apollo-server';
interface ContextType {
domain: string;
security: SecurityLevel;
metrics: MetricsCollector;
audit: AuditLogger;
}
const server = new ApolloServer({
typeDefs,
resolvers,
context: async ({ req }): Promise<ContextType> => {
return {
domain: 'user_management',
security: await SecurityLevel.fromRequest(req),
metrics: new MetricsCollector('user_ops'),
audit: new AuditLogger({
service: 'user-api',
level: 'detailed'
})
};
}
});
// Resolver using context
const resolvers = {
Mutation: {
updateUser: async (_, { input }, context: ContextType) => {
context.audit.log('user_update_initiated');
context.metrics.startOperation('user_update');
try {
// Implementation
} finally {
context.metrics.endOperation();
}
}
}
};
## Vue.js Implementation
### Composition API with Context
// context.ts
import { reactive, provide, inject } from 'vue';
export const contextKey = Symbol('context');
export function createContext() {
const context = reactive({
domain: 'front_end',
features: ['dark_mode', 'accessibility'],
analytics: {
enabled: true,
level: 'detailed'
},
security: {
csrf: true,
contentPolicy: 'strict'
}
});
return {
context,
provideContext() {
provide(contextKey, context);
}
};
}
// Component usage
export default {
setup() {
const context = inject(contextKey);
return {
async submitForm(data) {
context.analytics.logEvent('form_submission');
// Implementation
}
};
}
};
## Laravel PHP Implementation
### Context Middleware
namespace App\Http\Middleware;
use Closure;
use Illuminate\Http\Request;
class ContextMiddleware
{
public function handle(Request $request, Closure $next)
{
$context = new ServiceContext([
'domain' => 'web_application',
'monitoring' => [
'enabled' => true,
'level' => 'detailed'
],
'security' => [
'csrf' => true,
'rateLimit' => true
]
]);
$request->merge(['context' => $context]);
return $next($request);
}
}
// Controller usage
class UserController extends Controller
{
public function store(Request $request)
{
$context = $request->get('context');
$context->audit()->log('user_creation_started');
try {
// Implementation
} catch (Exception $e) {
$context->error()->log($e);
throw $e;
}
}
}
## Best Practices Across Frameworks
1. **Consistency in Implementation**
- Use similar patterns across services
- Maintain consistent naming conventions
- Share context interfaces
2. **Context Propagation**
- Ensure context flows through service calls
- Maintain audit trails
- Preserve security context
3. **Performance Considerations**
- Keep context lightweight
- Cache where appropriate
- Monitor context overheadBy Eduarda Ferreira