feat: migrate audit server runtime to gnet v2

AGENTS.md

@@ -0,0 +1,163 @@
+# AGENTS.md
+
+Repository-specific guidance for agentic coding assistants working in `vault-audit-filter`.
+
+## Scope and intent
+
+- This is a Go CLI/service that receives Vault audit logs over UDP, applies rule expressions, writes matching events, and optionally forwards/messages side effects.
+- Keep changes minimal and local; preserve existing architecture (`cmd/`, `pkg/`, integration tests with `//go:build integration`).
+- Prefer correctness and debuggability over clever optimizations.
+
+## Repository map
+
+- `main.go`: binary entrypoint.
+- `cmd/`: Cobra command wiring and configuration bootstrap.
+- `pkg/auditserver/`: core filtering and async side-effect pipeline.
+- `pkg/forwarder/`: UDP forwarding implementation.
+- `pkg/messaging/`: Slack and Slack webhook integrations.
+- `pkg/vault/`: Vault API client helpers/auth flows.
+- `integration_test.go`: integration suite guarded by build tag.
+
+## Toolchain and environment
+
+- Go version: `1.25.x` (see `go.mod` and GitHub Actions workflows).
+- CI forces toolchain via: `go env -w GOTOOLCHAIN=go1.25.0+auto`.
+- Integration tests expect a running Vault dev server.
+- Default local integration env values:
+  - `VAULT_ADDR=http://127.0.0.1:8200`
+  - `VAULT_TOKEN=root-token`
+
+## Build, lint, and test commands
+
+### Primary commands (from `Makefile`)
+
+- Build: `make build`
+- Unit tests: `make test-unit`
+- Integration tests: `make test-integration`
+- Coverage: `make test-coverage`
+- Lint+format gate: `make lint`
+- Full local gate: `make lint test build`
+
+### Direct Go equivalents
+
+- Build binary: `go build -o vault-audit-filter .`
+- Build all packages: `go build -v ./...`
+- Unit tests with race: `go test -v -race ./...`
+- Integration tests: `go test -tags=integration -v -race ./...`
+- Coverage profile:
+  - `go test -coverpkg=./... ./... -race -coverprofile=coverage.out -covermode=atomic`
+  - `go tool cover -func=coverage.out`
+- Vet: `go vet ./...`
+- Format: `go fmt ./...`
+
+### Run a single test (important)
+
+- Single test by name in one package:
+  - `go test -v ./pkg/forwarder -run '^TestUDPForwarder_ConcurrentForwarding$'`
+- Single subtest pattern:
+  - `go test -v ./pkg/auditserver -run 'TestReact_Branches/logger_print_branch_returns_None'`
+- Multiple tests by regex in one package:
+  - `go test -v ./pkg/auditserver -run 'TestNew_Async.*|TestEnqueueSide_.*'`
+- Integration single test:
+  - `VAULT_ADDR=http://127.0.0.1:8200 VAULT_TOKEN=root-token go test -tags=integration -v . -run '^TestIntegration_VaultConnection$'`
+
+### Helpful local infra commands
+
+- Start Vault for integration tests: `make docker-up`
+- Stop Vault: `make docker-down`
+- One-shot integration flow: `make integration`
+
+## CI behavior to mirror locally
+
+- Unit/coverage job runs race-enabled tests across all packages.
+- Integration job starts Vault service and runs `-tags=integration` tests.
+- Keep local checks aligned with CI to avoid drift.
+
+## Code style guidelines
+
+### Formatting and file structure
+
+- Always run `go fmt ./...` on touched packages/files.
+- Keep files gofmt-compliant; do not manually align whitespace.
+- Preserve package layout and current directory boundaries.
+- Prefer small focused functions; avoid large monolithic handlers.
+
+### Imports
+
+- Rely on gofmt import grouping/sorting.
+- Standard library imports first, third-party next, local module imports last.
+- Use import aliases only when required (name collisions or established convention, e.g., `json "github.com/bytedance/sonic"`).
+- Remove unused imports immediately.
+
+### Types and interfaces
+
+- Prefer concrete types unless an interface improves testability or boundary design.
+- Keep interfaces small and behavior-oriented (see `Messenger`, `Forwarder`).
+- Define interfaces at consumption boundaries when possible.
+- Use typed structs for configuration payloads rather than `map[string]any`, except where external APIs require maps.
+- Respect existing zero-value-safe behavior patterns.
+
+### Naming conventions
+
+- Exported identifiers: `PascalCase`; unexported: `camelCase`.
+- Keep names explicit and domain-based (`RuleGroupConfig`, `asyncEnqueueTimeout`).
+- Acronyms follow Go norms (`URL`, `ID`, `API`, `UDP`).
+- Test names: `Test<Subject>_<Scenario>` where practical.
+
+### Error handling
+
+- Never ignore meaningful errors; handle or return them.
+- Wrap returned errors with context using `%w` (e.g., `fmt.Errorf("failed to create UDP forwarder: %w", err)`).
+- Log errors with structured fields (`"error", err`) using `slog`.
+- Avoid `panic` in application paths; return errors upward.
+- In tests, use `require.NoError` for setup preconditions and `assert.*` for behavioral checks.
+
+### Logging and observability
+
+- Use structured logging (`log/slog`) in runtime code.
+- Keep log messages concise and stable; include key dimensions (rule group, config key, error).
+- Do not log secrets/tokens/webhook URLs.
+
+### Concurrency and performance
+
+- Prefer explicit synchronization (`sync.Mutex`, channels, atomics) over implicit assumptions.
+- Respect existing async queue/drop/wait/durable semantics in `pkg/auditserver`.
+- Avoid unnecessary allocations in hot paths; maintain current pooling/copy semantics unless changing behavior intentionally.
+- When changing async behavior, ensure drop metrics and retries remain coherent.
+
+### Configuration and defaults
+
+- Use `viper.SetDefault` for new config keys.
+- Validate and normalize user-provided config values with safe fallbacks.
+- Keep backward compatibility for existing config fields.
+
+## Testing guidelines
+
+- Prefer table-driven tests for branching logic.
+- Keep unit tests deterministic and isolated; avoid external network dependencies unless explicitly integration-tagged.
+- For integration coverage, keep `//go:build integration` guard.
+- Use `t.TempDir()` for filesystem tests.
+- Validate concurrent behavior with synchronization primitives, not long arbitrary sleeps (except where unavoidable).
+- When fixing a bug, add or update the smallest regression test that fails before the fix.
+
+## Safety and change boundaries
+
+- Do not introduce new dependencies unless clearly justified.
+- Do not mix broad refactors with behavior changes in one patch.
+- Preserve existing public behavior unless task explicitly asks for a behavior change.
+- Keep secrets out of code, logs, and tests.
+
+## Cursor/Copilot instructions audit
+
+- `.cursor/rules/`: not present in this repository.
+- `.cursorrules`: not present in this repository.
+- `.github/copilot-instructions.md`: not present in this repository.
+- No additional agent rule files were found beyond this `AGENTS.md`.
+
+## Quick pre-PR checklist for agents
+
+- Run: `go fmt ./...`
+- Run: `go vet ./...`
+- Run: `go test -v -race ./...`
+- If integration-related code changed, run: `go test -tags=integration -v -race ./...`
+- Summarize what changed, why, and exact verification commands executed.

cmd/auditServer.go

@@ -19,7 +19,7 @@ import (
 	"fmt"
 
 	"github.com/ncode/vault-audit-filter/pkg/auditserver"
-	"github.com/panjf2000/gnet"
+	"github.com/panjf2000/gnet/v2"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 )
@@ -35,7 +35,7 @@ var auditServerCmd = &cobra.Command{
 		if err != nil {
 			return fmt.Errorf("failed to create audit server: %w", err)
 		}
-		return gnet.Serve(server, addr, gnet.WithMulticore(true))
+		return gnet.Run(server, addr, gnet.WithMulticore(true))
 	},
 }
 

cmd/auditServer_test.go

@@ -54,3 +54,12 @@ func TestAuditServerCmd_ValidConfig(t *testing.T) {
 	assert.Equal(t, "auditServer", auditServerCmd.Use)
 	assert.NotNil(t, auditServerCmd.RunE)
 }
+
+func TestAuditServerCmd_RunE_InvokesGnetRun(t *testing.T) {
+	viper.Reset()
+	viper.Set("vault.audit_address", "bad host")
+	viper.Set("rule_groups", []map[string]interface{}{})
+
+	err := auditServerCmd.RunE(auditServerCmd, []string{})
+	assert.Error(t, err)
+}

go.mod

@@ -6,7 +6,6 @@ require (
 	github.com/bytedance/sonic v1.15.0
 	github.com/expr-lang/expr v1.17.7
 	github.com/hashicorp/vault/api v1.22.0
-	github.com/panjf2000/gnet v1.6.7
 	github.com/panjf2000/gnet/v2 v2.9.7
 	github.com/slack-go/slack v0.17.3
 	github.com/spf13/cobra v1.10.2
@@ -38,6 +37,7 @@ require (
 	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/panjf2000/ants/v2 v2.11.3 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/ryanuber/go-glob v1.0.0 // indirect
@@ -54,6 +54,7 @@ require (
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	golang.org/x/arch v0.23.0 // indirect
 	golang.org/x/net v0.48.0 // indirect
+	golang.org/x/sync v0.19.0 // indirect
 	golang.org/x/sys v0.39.0 // indirect
 	golang.org/x/text v0.32.0 // indirect
 	golang.org/x/time v0.14.0 // indirect

go.sum

@@ -1,13 +1,7 @@
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/bytedance/gopkg v0.1.3 h1:TPBSwH8RsouGCBcMBktLt1AymVo2TVsBVCY4b6TnZ/M=
 github.com/bytedance/gopkg v0.1.3/go.mod h1:576VvJ+eJgyCzdjS+c4+77QF3p7ubbtiKARP3TxducM=
-github.com/bytedance/sonic v1.14.2 h1:k1twIoe97C1DtYUo+fZQy865IuHia4PR5RPiuGPPIIE=
-github.com/bytedance/sonic v1.14.2/go.mod h1:T80iDELeHiHKSc0C9tubFygiuXoGzrkjKzX2quAx980=
 github.com/bytedance/sonic v1.15.0 h1:/PXeWFaR5ElNcVE84U0dOHjiMHQOwNIx3K4ymzh/uSE=
 github.com/bytedance/sonic v1.15.0/go.mod h1:tFkWrPz0/CUCLEF4ri4UkHekCIcdnkqXw9VduqpJh0k=
-github.com/bytedance/sonic/loader v0.4.0 h1:olZ7lEqcxtZygCK9EKYKADnpQoYkRQxaeY2NYzevs+o=
-github.com/bytedance/sonic/loader v0.4.0/go.mod h1:AR4NYCk5DdzZizZ5djGqQ92eEhCCcdf5x77udYiSJRo=
 github.com/bytedance/sonic/loader v0.5.0 h1:gXH3KVnatgY7loH5/TkeVyXPfESoqSBSBEiDd5VjlgE=
 github.com/bytedance/sonic/loader v0.5.0/go.mod h1:AR4NYCk5DdzZizZ5djGqQ92eEhCCcdf5x77udYiSJRo=
 github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
@@ -64,11 +58,8 @@ github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/klauspost/cpuid/v2 v2.3.0 h1:S4CRMLnYUhGeDFDqkGriYKdfoFlDnMtqTiI/sFzhA9Y=
 github.com/klauspost/cpuid/v2 v2.3.0/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
-github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/mattn/go-colorable v0.1.14 h1:9A9LHSqF/7dyVVX6g0U9cwm9pG3kP9gSzcuIPHPsaIE=
@@ -79,14 +70,12 @@ github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
-github.com/panjf2000/ants/v2 v2.4.7 h1:MZnw2JRyTJxFwtaMtUJcwE618wKD04POWk2gwwP4E2M=
-github.com/panjf2000/ants/v2 v2.4.7/go.mod h1:f6F0NZVFsGCp5A7QW/Zj/m92atWwOkY0OIhFxRNFr4A=
-github.com/panjf2000/gnet v1.6.7 h1:zv1k6kw80sG5ZQrLpbbFDheNCm50zm3z2e3ck5GwMOM=
-github.com/panjf2000/gnet v1.6.7/go.mod h1:KcOU7QsCaCBjeD5kyshBIamG3d9kAQtlob4Y0v0E+sc=
+github.com/panjf2000/ants/v2 v2.11.3 h1:AfI0ngBoXJmYOpDh9m516vjqoUu2sLrIVgppI9TZVpg=
+github.com/panjf2000/ants/v2 v2.11.3/go.mod h1:8u92CYMUc6gyvTIw8Ru7Mt7+/ESnJahz5EVtqfrilek=
+github.com/panjf2000/gnet/v2 v2.9.7 h1:6zW7Jl3oAfXwSuh1PxHLndoL2MQRWx0AJR6aaQjxUgA=
 github.com/panjf2000/gnet/v2 v2.9.7/go.mod h1:WQTxDWYuQ/hz3eccH0FN32IVuvZ19HewEWx0l62fx7E=
 github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
 github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
-github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
@@ -115,9 +104,6 @@ github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSS
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
 github.com/stretchr/objx v0.5.2 h1:xuMeJ0Sdp5ZMRXx/aWO6RZxdr3beISkG5/G/aIRr3pY=
 github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
-github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
@@ -130,68 +116,31 @@ github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS
 github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2+aY1QWCk3Cedj/Gdt08=
 github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
-github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
-go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
-go.uber.org/atomic v1.9.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
-go.uber.org/goleak v1.1.11-0.20210813005559-691160354723/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
-go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
-go.uber.org/multierr v1.7.0/go.mod h1:7EAYxJLBy9rStEaz58O2t4Uvip6FSURkq8/ppBp95ak=
 go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
 go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
-go.uber.org/zap v1.19.1/go.mod h1:j3DNczoxDZroyBnOT1L/Q79cfUMGZxlv/9dzN7SM1rI=
 go.uber.org/zap v1.27.1 h1:08RqriUEv8+ArZRYSTXy1LeBScaMpVSTBhCeaZYfMYc=
 go.uber.org/zap v1.27.1/go.mod h1:GB2qFLM7cTU87MWRP2mPIjqfIDnGu+VIO4V/SdhGo2E=
 go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
 golang.org/x/arch v0.23.0 h1:lKF64A2jF6Zd8L0knGltUnegD62JMFBiCPBmQpToHhg=
 golang.org/x/arch v0.23.0/go.mod h1:dNHoOeKiyja7GTvF9NJS1l3Z2yntpQNzgrjh1cU103A=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
-golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.48.0 h1:zyQRTTrjc33Lhh0fBgT/H3oZq9WuvRR5gPC70xpDiQU=
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openspec/changes/archive/2026-02-11-migrate-gnet-v2/.openspec.yaml

@@ -0,0 +1,2 @@
+schema: spec-driven
+created: 2026-02-10