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perf(gpui): parse each agent activity record once when it arrives - #138
Stack: 2 of 2. Base: brandon/dev-3012-activity-bubbles-cache, the layer 1 PR.
Linear: DEV-3013
Why
Agent activity records are stored as JSON text and parsed again on every read. On the selection path, a read goes string → parse (raw_records) → to_string_pretty for each batch child → parse again (request_activity). Layer 1 stops this from running on every frame. This layer makes each run that remains cheap.
What changes
Record::new, used by admit for both live and history records, parses the record once. It reuses the JSON that receive / show_history_page already parsed, and stores the result as record.events: one request::Event per batch child, or one for the envelope itself.
Each Event holds the channel, kind, a valid turn id, the seq (kept only within 0..2^53), the timestamp, and the trigger ids. Trigger ids are kept only on turn_started events.
request_activity reads record.events and does no JSON parsing or serialization. Its selection rules are unchanged: admission at received_at + 5000, uncertain detection, seq checks, and the first admitted terminal event.
requested() in mod.rs re-parsed every live record on each publish. It now reads events too.
plaintext and raw_records are unchanged, so the Raw view shows the same output.
Behaviour change:request_activity with an empty channel now returns an empty selection. No caller passes an empty channel. request_work only passes channels taken from channel_ids, and those are never empty.
Not converted:current::working_details, activity_preview and external_plugins/observed.rs still parse plaintext. They aren't on the per-frame path that caused the lag. They can follow if a profile shows them.
The 4 failing tests are the same environment-dependent tests that fail on main; see the layer 1 PR.
New tests:
selection_matches_reading_the_json_on_every_edge compares the new selection with the old JSON-based logic on 2 agents × 2 channels × 9 id sets. The inputs cover invalid JSON, bad batches, turn ids of 0, 256 and 257 bytes, seq at −1, 2^53−1, 2^53 and 1.5, timestamps exactly at the 5000 ms admission limit and 1 ms past it, and duplicate starts.
selection_reads_batch_children_in_their_own_channel checks batch children in two channels.
Each of these mutations made a new test fail: moving the admission limit, dropping the channel filter, and keeping trigger ids on every kind.
Summary by CodeRabbit
Bug Fixes
Agent activity now selects matching events by agent and channel, including events contained in batched requests.
Activity selection handles missing channels, unusable turn IDs, malformed input, and timestamp boundaries more consistently.
Removed agents are stopped after servers with no active entries or previews are unregistered.
Agent activity records were kept as JSON text and parsed again on every
read. Selecting the turns a message started (request_activity) asked
raw_records for the channel's entries, which parsed each record and
pretty-printed each batch child, then parsed that output again for the
turn id, seq, kind, timestamp and triggers. The turn-start index built
on each publish also re-parsed every live record. With layer 1 the
bubble answers are remembered per snapshot, but each new snapshot still
paid string -> parse -> pretty-print -> parse for every record.
A record now keeps the few fields selection needs, read from the JSON it
was already parsed into on arrival: for the envelope, or each batch
child, its channel, kind, usable turn id, bounded seq, timestamp and (for
turn starts only) its string trigger ids. Events naming no channel, or
with no usable turn id that are not turn starts, are not kept, as no
selection can read them. request_activity and the turn-start index read
these fields with no JSON parsing or serialization. The plaintext and
the Raw view's output are unchanged.
Selections are unchanged: a test compares request_activity against the
previous parse-based reading over batches, other channels, invalid or
non-object JSON, missing and oversized turn ids, seq and timestamp
bounds, and duplicate starts. An empty channel, which no caller asks
for, now selects nothing instead of reading unscoped records.
Refs: DEV-3013
Signed-off-by: blu@blu.cx <38222767+thebrandonlucas@users.noreply.github.com>
Records now cache parsed request events, and agent activity selection uses those events. Codex runtime synchronization now stops removed agents after unregistering idle servers.
Changes: Agent Activity Event Selection
Layer / File(s)
Summary
Parse and cache record events apps/buzz-gpui/crates/app/src/agent_activity/mod.rs, apps/buzz-gpui/crates/app/src/agent_activity/request.rs, apps/buzz-gpui/crates/app/src/agent_activity/current.rs, apps/buzz-gpui/crates/app/src/agent_activity/transcript_model.rs, apps/buzz-gpui/crates/app/src/mission_control/tests.rs
Record now stores parsed request events. Record construction derives event and channel data from raw JSON. Test helpers initialize the new field. The text validation rule is unchanged.
Select activity from cached events apps/buzz-gpui/crates/app/src/agent_activity/request.rs, apps/buzz-gpui/crates/app/src/agent_activity/mod.rs, apps/buzz-gpui/crates/app/src/agent_activity/request/tests.rs
request_activity filters cached events by agent and channel. Requested-ID selection uses cached turn-start events and their triggers. Tests compare selection against results reread from raw records.
Codex Agent Shutdown Ordering
Layer / File(s)
Summary
Unregister idle servers before stopping agents apps/buzz-gpui/crates/app/src/agent_plugins/codex/runtime.rs
sync collects removed agents, unregisters idle servers, then stops the collected agents.
This change makes agent activity selection cheaper by parsing each record once when it arrives, with selection rules reported as unchanged. It also reorders Codex agent shutdown so idle servers are unregistered first. No concrete regression was identified, so the change looks safe to merge.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
Check name
Status
Explanation
Resolution
Docstring Coverage
Docstring coverage is 77.78% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Title check
The title clearly describes the main change: parsing agent activity records once when they arrive.
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Full details: Docstring Coverage
Explanation
Docstring coverage is 77.78% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 9 functions across 7 files.
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Stack: 2 of 2. Base:
brandon/dev-3012-activity-bubbles-cache, the layer 1 PR.Linear: DEV-3013
Why
Agent activity records are stored as JSON text and parsed again on every read. On the selection path, a read goes string → parse (
raw_records) →to_string_prettyfor each batch child → parse again (request_activity). Layer 1 stops this from running on every frame. This layer makes each run that remains cheap.What changes
Record::new, used byadmitfor both live and history records, parses the record once. It reuses the JSON thatreceive/show_history_pagealready parsed, and stores the result asrecord.events: onerequest::Eventper batch child, or one for the envelope itself.Eventholds the channel, kind, a valid turn id, the seq (kept only within0..2^53), the timestamp, and the trigger ids. Trigger ids are kept only onturn_startedevents.request_activityreadsrecord.eventsand does no JSON parsing or serialization. Its selection rules are unchanged: admission atreceived_at + 5000, uncertain detection, seq checks, and the first admitted terminal event.requested()inmod.rsre-parsed every live record on each publish. It now readseventstoo.plaintextandraw_recordsare unchanged, so the Raw view shows the same output.Behaviour change:
request_activitywith an empty channel now returns an empty selection. No caller passes an empty channel.request_workonly passes channels taken fromchannel_ids, and those are never empty.Not converted:
current::working_details,activity_previewandexternal_plugins/observed.rsstill parseplaintext. They aren't on the per-frame path that caused the lag. They can follow if a profile shows them.Validation
All run in
nix developfromapps/buzz-gpui:cargo fmt --all --checkcargo clippy --workspace --all-targets --locked -- -D warningscargo clippy -p buzz-gpui --all-targets --locked --features voltage-sandbox -- -D warningscargo test -p buzz-gpui agent_activitycargo test -p buzz-gpui --lockedThe 4 failing tests are the same environment-dependent tests that fail on
main; see the layer 1 PR.New tests:
selection_matches_reading_the_json_on_every_edgecompares the new selection with the old JSON-based logic on 2 agents × 2 channels × 9 id sets. The inputs cover invalid JSON, bad batches, turn ids of 0, 256 and 257 bytes, seq at −1, 2^53−1, 2^53 and 1.5, timestamps exactly at the 5000 ms admission limit and 1 ms past it, and duplicate starts.selection_reads_batch_children_in_their_own_channelchecks batch children in two channels.Each of these mutations made a new test fail: moving the admission limit, dropping the channel filter, and keeping trigger ids on every kind.
Summary by CodeRabbit