feat(egress): let a distribution police the connections core dials directly - #905
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SantiagoDePolonia wants to merge 4 commits into
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feat(egress): let a distribution police the connections core dials directly#905SantiagoDePolonia wants to merge 4 commits into
SantiagoDePolonia wants to merge 4 commits into
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…rectly HTTP clients follow the standard proxy variables, so a distribution that wants to see every outbound request only has to set HTTP_PROXY. The database, cache, and vector store clients speak their own protocols over raw TCP and read no such variable: they connect wherever their URL points, whatever policy the distribution believes it is enforcing. Add an egress package holding one process-wide dial hook, and route the PostgreSQL, MongoDB, Redis, and pgvector clients through it. Without a hook installed they dial exactly as before. With one, the hostname reaches it unresolved - pgx would otherwise resolve first and hand the hook addresses it had already chosen, leaving an allowlisted name unmatchable - so one place decides what a name may resolve to and dials the address that passed. GoModel Pro's air-gapped mode installs its egress guard here, which is what makes a Postgres or Redis address outside the air gap refused before it is dialled rather than audited once at startup and then trusted. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01J5JDPHb6ja5M1UFv12nwUf
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📝 WalkthroughWalkthroughThe PR adds a process-wide egress dial hook. Redis, PostgreSQL, pgvector, and MongoDB clients use the hook for outbound connections. Tests verify hook lifecycle, hostname handling, address routing, and default dialing. ChangesEgress routing
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to This change routes storage connections through a shared egress hook. The remaining risk is limited to test isolation: overlapping tests could clear another test's active hook and cause flaky or misleading test results; production behavior is otherwise covered by focused client-path tests. Sequence Diagram(s)sequenceDiagram
participant Client
participant StorageClient
participant Egress
participant Target
Client->>StorageClient: Create connection
StorageClient->>Egress: DialContext(network, address)
Egress->>Target: Invoke installed hook or default dialer
Target-->>Egress: Connection or error
Egress-->>StorageClient: Return connection or error
StorageClient-->>Client: Return client or connection error
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Inline comments:
In `@internal/responsecache/vecstore_pgvector.go`:
- Line 44: Add focused coverage for newPGVectorStore’s pgx connection path by
installing a refusing egress.DialContext hook, creating the store, and asserting
the hook receives the configured hostname. Follow the repository’s existing test
guidance and patterns without changing unrelated behavior.
In `@internal/storage/postgresql.go`:
- Around line 45-49: Update NewPostgreSQL so pool construction does not snapshot
egress.Installed(); configure hostname-preserving lookup behavior for every
connection, allowing a hook installed after pool creation to evaluate the
configured PostgreSQL host. Add a regression test covering late hook
installation and a replacement connection.
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egress/egress.goegress/egress_test.gointernal/cache/egress_hook_test.gointernal/cache/redis.gointernal/responsecache/vecstore_pgvector.gointernal/storage/egress_hook_test.gointernal/storage/mongodb.gointernal/storage/postgresql.go
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…wner Review follow-ups. pgx resolves a host before it dials, so a pool built while no hook was installed kept pgx's resolver and handed a later-installed hook addresses it had already chosen - which a hostname policy cannot judge. The lookup now goes through egress.Lookup on every connection: the name passes through while a hook is installed, and pgx's own resolver answers when none is, keeping its multi-address fallback intact. Install also no longer replaces an existing hook silently. The policy belongs to whatever composes the process, and there is one: a second Install is an error, and Uninstall removes the hook. That is what a nil dial used to mean, which read as "install nothing" rather than "remove". Adds the pgvector store's own hook coverage - it opens a pool separate from the storage backend - and a Lookup test for the late-installation case. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01J5JDPHb6ja5M1UFv12nwUf
…vel remove Install returns the handle that removes the hook, and only that handle can: a package that merely imports egress can no longer take the policy away from the clients running under it. A stale handle leaves a hook installed later alone, so removal cannot cross owners either. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01J5JDPHb6ja5M1UFv12nwUf
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Actionable comments posted: 1
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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
In `@egress/egress_test.go`:
- Line 16: Update the hook tests to retain every successful Install result and
register t.Cleanup(hook.Uninstall) for each hook, including the installation
near line 106. Remove direct installed.Store(nil) cleanup so each Hook.Uninstall
only removes the hook owned by that test.
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egress/egress.goegress/egress_test.gointernal/cache/egress_hook_test.gointernal/responsecache/egress_hook_test.gointernal/storage/egress_hook_test.go
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The tests cleaned up with installed.Store(nil), the package-internal shortcut the exported API deliberately does not offer: it clears whatever hook is installed, this test's or not. They hold the handles Install returned and uninstall those instead, which is also how a caller does it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01J5JDPHb6ja5M1UFv12nwUf
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Why
HTTP clients follow the standard proxy variables, so a distribution that wants to see every outbound request only has to set
HTTP_PROXY. The database, cache, and vector store clients speak their own protocols over raw TCP and read no such variable — they connect wherever their URL points, whatever policy the distribution believes it is enforcing.This came out of a review of GoModel Pro's air-gapped mode: its egress guard covers HTTP, so a Postgres, MongoDB, or Redis hostname that passes the startup audit can resolve publicly on a later connection, with no runtime check and no refusal evidence.
What
egresspackage: one process-wide dial hook (Install/DialContext, plus aDialer{}adapter for the MongoDB driver's interface). With no hook installed the defaultnet.Dialeris used, so core's behaviour is unchanged.internal/storage/postgresql.go(pgxDialFunc),internal/storage/mongodb.go(SetDialer),internal/cache/redis.go(opts.Dialer), andinternal/responsecache/vecstore_pgvector.go(now parses the pool config so it can setDialFunc).LookupFuncso the hook receives the configured hostname rather than addresses pgx already resolved — otherwise an allowlisted name can never match. The default path keeps pgx's own resolution and multi-address fallback.Tests
egress/egress_test.go: default dialer, hook interception, the Mongo adapter, andInstall(nil)restoring the default.internal/storage/egress_hook_test.goandinternal/cache/egress_hook_test.go: refuse the dial from a test hook and assert each client asked the hook for the address its URL names. The PostgreSQL one fails without theLookupFuncchange.Full
go test ./...passes.Downstream
GoModel Pro's air-gapped guard installs itself here (
Guard.DialContext), which is what turns "audited once at startup" into "refused before it is dialled, and recorded in/admin/pro/egress". The Pro side needs a release containing this package before it can pin it.🤖 Generated with Claude Code
https://claude.ai/code/session_01J5JDPHb6ja5M1UFv12nwUf
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