Crate mz_balancerd

The balancerd service is a horizontally scalable, stateless, multi-tenant ingress router for pgwire and HTTPS connections.

It listens on pgwire and HTTPS ports. When a new pgwire connection starts, the requested user is authenticated with frontegg from which a tenant id is returned. From that a target internal hostname is resolved to an IP address, and the connection is proxied to that address which has a running environmentd’s pgwire port. When a new HTTPS connection starts, its SNI hostname is used to generate an internal hostname that is resolved to an IP address, which is similarly proxied.

Modules

• codec 🔒

Structs

• BalancerConfig
• BalancerMetrics
  Prometheus monitoring metrics.
• BalancerService
• CountingConn 🔒
• FronteggResolver
• GaugeGuard 🔒
  Wraps an IntGauge and automatically incs on init and drops on drop. Callers should not call inc().. Useful for handling multiple task exit points, for example in the case of a panic.
• HttpsBalancer 🔒
• InternalHttpServer 🔒
• PgwireBalancer 🔒
• ResolvedAddr 🔒
• ServerMetrics 🔒
• ServerMetricsConfig 🔒

Enums

• Resolver

Constants

• BUILD_INFO
  Balancer build information.

Traits

• ClientStream 🔒

Functions

• cancel_request 🔒
  Broadcasts cancellation to all matching environmentds. conn_id’s bits [31..20] are the lower 12 bits of a UUID for an environmentd/organization. Using that and the template in cancellation_resolver we generate a hostname. That hostname resolves to all IPs of envds that match the UUID (cloud k8s infrastructure maintains that mapping). This function creates a new task for each envd and relays the cancellation message to it, broadcasting it to any envd that might match the connection.
• handle_readiness_check 🔒
• lookup 🔒
  Returns the first IP address resolved from the provided hostname.