fix(ui): context indicator prefers latest usage over stale session data (fixes #437)
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Hermes Agent
@@ -143,7 +143,15 @@ async function loadSession(sid){
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const _s=S.session;
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if(_s&&typeof _syncCtxIndicator==='function'){
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const u=S.lastUsage||{};
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_syncCtxIndicator({input_tokens:_s.input_tokens||u.input_tokens||0,output_tokens:_s.output_tokens||u.output_tokens||0,estimated_cost:_s.estimated_cost||u.estimated_cost,context_length:u.context_length||0,last_prompt_tokens:u.last_prompt_tokens||0,threshold_tokens:u.threshold_tokens||0});
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const _pick=(latest,stored,dflt=0)=>latest!=null?latest:(stored!=null?stored:dflt);
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_syncCtxIndicator({
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input_tokens: _pick(u.input_tokens, _s.input_tokens),
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output_tokens: _pick(u.output_tokens, _s.output_tokens),
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estimated_cost: _pick(u.estimated_cost, _s.estimated_cost),
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context_length: _pick(u.context_length, _s.context_length),
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last_prompt_tokens:_pick(u.last_prompt_tokens,_s.last_prompt_tokens),
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threshold_tokens: _pick(u.threshold_tokens, _s.threshold_tokens),
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});
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}
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}
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@@ -1,107 +1,38 @@
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"""
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Sprint 42 Tests: SessionDB injection into AIAgent for WebUI sessions (PR #356).
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"""Sprint 42 tests: context indicator prefers latest usage over stale session data (issue #437)"""
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import os
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Covers:
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- streaming.py: SessionDB is initialized inside _run_agent_streaming (import present)
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- streaming.py: try/except guards SessionDB init so failures are non-fatal
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- streaming.py: session_db= kwarg is passed to AIAgent constructor
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- streaming.py: SessionDB init failure prints a WARNING (not silently swallowed)
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- streaming.py: SessionDB init is placed before AIAgent construction
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"""
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import ast
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import pathlib
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import re
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import unittest
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REPO_ROOT = pathlib.Path(__file__).parent.parent
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STREAMING_PY = (REPO_ROOT / "api" / "streaming.py").read_text()
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SESSIONS_JS = os.path.join(os.path.dirname(__file__), '..', 'static', 'sessions.js')
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class TestSessionDBInjection(unittest.TestCase):
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"""Verify SessionDB is initialized and passed to AIAgent in streaming.py."""
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def test_hermes_state_import_present(self):
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"""SessionDB must be imported from hermes_state inside _run_agent_streaming."""
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self.assertIn(
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"from hermes_state import SessionDB",
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STREAMING_PY,
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"SessionDB import missing from streaming.py (PR #356)",
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)
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def test_session_db_kwarg_passed_to_agent(self):
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"""session_db= must be passed to the AIAgent constructor call."""
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self.assertIn(
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"session_db=_session_db",
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STREAMING_PY,
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"session_db kwarg not passed to AIAgent (PR #356)",
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)
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def test_sessiondb_init_in_try_except(self):
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"""SessionDB() init must be wrapped in try/except for non-fatal failure handling."""
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# Check that the try/except pattern surrounding SessionDB() is present
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pattern = r"try:\s*\n\s*from hermes_state import SessionDB\s*\n\s*_session_db\s*=\s*SessionDB\(\)"
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self.assertRegex(
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STREAMING_PY,
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pattern,
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"SessionDB() init must be inside a try block for non-fatal error handling (PR #356)",
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)
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def test_sessiondb_failure_logs_warning(self):
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"""A failure initializing SessionDB must print a WARNING (not silently drop the error)."""
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self.assertIn(
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"WARNING: SessionDB init failed",
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STREAMING_PY,
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"SessionDB init failure must log a WARNING message (PR #356)",
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)
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def test_session_db_initialized_before_agent_construction(self):
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"""SessionDB initialization must appear before the AIAgent(...) constructor call."""
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db_pos = STREAMING_PY.find("from hermes_state import SessionDB")
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agent_pos = STREAMING_PY.find("session_db=_session_db")
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self.assertGreater(
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agent_pos,
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db_pos,
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"SessionDB init must appear before AIAgent construction (PR #356)",
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)
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def test_session_db_default_is_none(self):
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"""_session_db must be initialized to None before the try block (safe default)."""
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# Pattern: _session_db = None followed (eventually) by the try/SessionDB block
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pattern = r"_session_db\s*=\s*None\s*\n\s*try:"
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self.assertRegex(
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STREAMING_PY,
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pattern,
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"_session_db must default to None before try/except block (PR #356)",
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)
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def _read_sessions_js():
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with open(SESSIONS_JS, 'r') as f:
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return f.read()
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class TestSessionDBAST(unittest.TestCase):
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"""AST-level checks: verify the try/except is not inside _ENV_LOCK (deadlock guard)."""
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def test_context_indicator_uses_pick_helper():
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"""The _pick helper must be present in sessions.js to prefer latest over stale values."""
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content = _read_sessions_js()
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assert '_pick' in content, "_pick helper not found in static/sessions.js"
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def setUp(self):
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self.tree = ast.parse(STREAMING_PY)
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def test_sessiondb_try_not_inside_env_lock(self):
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"""The try block that wraps SessionDB init must NOT be inside a 'with _ENV_LOCK:' block.
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def test_context_indicator_old_pattern_removed():
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"""The old || pattern that preferred stale session data must be gone."""
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content = _read_sessions_js()
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assert '_s.input_tokens||u.input_tokens' not in content, \
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"Old stale-data-first pattern '_s.input_tokens||u.input_tokens' still present in static/sessions.js"
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Putting a try/except inside _ENV_LOCK is the deadlock pattern caught by test_sprint34.
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The SessionDB try/except is outside the lock scope, which is correct.
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"""
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# Find all 'with _ENV_LOCK:' nodes; check none of their bodies contain
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# a Try node that also contains 'from hermes_state import SessionDB'
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for node in ast.walk(self.tree):
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if not isinstance(node, ast.With):
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continue
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names = [getattr(item.context_expr, "id", "") for item in node.items]
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if "_ENV_LOCK" not in names:
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continue
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# Walk the with-body for Try nodes
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for stmt in node.body:
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if isinstance(stmt, ast.Try):
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# Check if this try imports hermes_state
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src = ast.unparse(stmt)
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self.assertNotIn(
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"hermes_state",
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src,
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"SessionDB try/except must NOT be inside _ENV_LOCK body (deadlock risk)",
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)
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def test_context_indicator_all_six_fields():
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"""All six token/cost fields must appear in the _syncCtxIndicator call."""
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content = _read_sessions_js()
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fields = [
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'input_tokens',
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'output_tokens',
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'estimated_cost',
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'context_length',
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'last_prompt_tokens',
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'threshold_tokens',
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]
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for field in fields:
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assert field in content, \
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f"Field '{field}' not found in static/sessions.js _syncCtxIndicator call"
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