Module dataplane 

In-process CloudFront data plane.

Mirrors the ELBv2 data plane (fakecloud-elbv2/src/dataplane.rs): a supervisor loop binds one TcpListener on 127.0.0.1:0 per enabled distribution, records the OS-allocated port back into distribution state as bound_port, and serves viewer requests via hyper. The AWS-shaped *.cloudfront.net domain stays cosmetic; clients discover the real address via /_fakecloud/cloudfront/distributions and connect to http://127.0.0.1:{bound_port}/....

handle_request selects a cache behavior by path pattern, resolves its origin, reverse-proxies to it, and applies CustomErrorResponses (e.g. the SPA 404 -> /index.html served as 200). There is no global edge network — this is a single local origin-serving node, matching the ALB/API Gateway precedent. Deferred (not implemented): in-path CloudFront Functions / Lambda@Edge, TTL caching / invalidation, and OAC/SigV4 to private S3.

Functions

dataplane_enabled

Whether the data plane should run. Disabled by setting FAKECLOUD_CLOUDFRONT_DISABLE_DATAPLANE to a truthy value (mirrors the ELBv2 flag), for environments that only exercise the control plane.

spawn_dataplane

Spawn the CloudFront data-plane supervisor. No-op (returns without spawning) when disabled via the env flag. server_port is fakecloud’s own listen port, used to reach S3-website origins served by this process.