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src/config/httpConfigClient.ts
HTTP-based ConfigClient that fetches flag state from the remote service.
// HTTP config client — fetches feature flag state from the remote config service.
import type { ConfigClient } from "../middleware/featureFlag";
 
const CONFIG_SERVICE_URL = process.env.CONFIG_SERVICE_URL ?? "http://config-service/flags";
 
// Parameters: none — URL is read from CONFIG_SERVICE_URL env var at construction.
// Returns: ConfigClient instance backed by the remote config service.
export function createHttpConfigClient(): ConfigClient {
  return {
    async getFlag(name: string): Promise<boolean> {
      const response = await fetch(`${CONFIG_SERVICE_URL}/${name}`);
      if (!response.ok) {
        throw new Error(`Config service returned ${response.status} for flag ${name}`);
      }
      const data = await response.json() as { enabled: boolean };
      return data.enabled;
    },
  };
}