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snapshot-building
Define statsengine.Accumulator (Ingest + Reset) to represent the
event-accumulation responsibility separately from runtime.SnapshotSource
(Snapshot), which handles the read side. This reduces the SRP violation in
Engine: callers that only push events now hold an Accumulator; callers that only
read statistics hold a SnapshotSource.
- Add Accumulator interface and compile-time assertion in statsengine/engine.go
- Add EventIngester type alias (= statsengine.Accumulator) in runtime/runtime.go
with a compile-time assertion, so callers in the runtime layer can reference
the ingestion contract without importing statsengine directly
- Split tuiRuntime.engine field into accumulator + snapSource so the event-loop
callback holds Accumulator and wireRuntimeBindings passes SnapshotSource to
SetDashboardSnapshotSource — making each consumer's dependency explicit
- Simplify resetDashboardSnapshotSource in tui.go to cast for interface{ Reset() }
independently of Snapshot(), removing the combined ad-hoc interface check
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Replace sync.WaitGroup with errgroup.Group in buildSubSnapshots so errors from
sub-builders (buildSyscallSnapshots, buildFileSnapshots, buildProcessSnapshots,
buildHistogramSnapshot) are captured and propagated rather than silently dropped.
Change Engine.Snapshot() to return (*Snapshot, error), update runtime.SnapshotSource
and dashboard.SnapshotSource interfaces accordingly, and adjust all callers in
tui.go, dashboard/model.go, and the test helpers.
Each sub-builder now returns (result, error); the error return is currently
always nil but establishes the contract for future validation. The per-type
Snapshot() convenience methods (histogram, syscall, file, process) panic on
error since they are internal helpers where failure would be a programming bug.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Run gofmt -w on 9 files that had minor alignment/whitespace drift
(pair.go, filter.go, ior_mode_registry.go, ior_mode_test.go,
runtime.go, engine.go, dashboard/model.go, flamegraph/model.go,
flamegraph/renderer.go).
Add two new Mage targets to Magefile.go:
- `mage fmt` – rewrites all .go files in-place via go/format
- `mage fmtCheck` – dry-run check; fails with a list of offending
files, suitable as a CI gate
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Add var _ Interface = (*ConcreteType)(nil) assertions for:
- *flamegraph.LiveTrie → runtime.{Snapshotter,Configurator,LiveTrieSource}
and tui/flamegraph.{Snapshotter,Configurator,LiveTrieSource}
- *probemanager.Manager → runtime.ProbeManager
- *statsengine.Engine → runtime.SnapshotSource
- *streamrow.RingBuffer → runtime.EventSink
- *runtimeBindings (tui) → runtime.TraceRuntimeBindings
- *lateBoundDashboardSource → dashboard.SnapshotSource
- libbpfTracepointProgram/Module → probemanager.{Program,Attacher}
Assertions are grouped close to their interface definitions to avoid
introducing new import cycles (runtime already imports all affected
packages; tui/flamegraph already imports coreflamegraph).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Applies the Interface Segregation Principle to LiveTrieSource in both
internal/runtime and internal/tui/flamegraph. The monolithic interface is
replaced by two focused sub-interfaces — Snapshotter (read-only: Version,
SnapshotJSON, SnapshotTree) and Configurator (mutating: Fields, CountField,
Reconfigure, SetCountField, Reset) — which LiveTrieSource then embeds so all
existing consumers continue to compile unchanged. The buildSnapshotMsg helper
is narrowed to Snapshotter since it only reads snapshot data, preventing
accidental mutation from the background goroutine.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Introduce internal/runtime as a neutral contract package that both the
core engine (internal) and the TUI layer (internal/tui) depend on.
- internal/runtime: defines TraceStarter, StreamSource, EventSink,
LiveTrieSource, SnapshotSource, ProbeManager, RuntimePublisher,
RuntimeState, TraceRuntimeBindings, and all context key/helper
functions (RuntimeBindingsFromContext, RuntimePublisherFromContext,
ContextWithRuntimeBindings, ContextWithTraceFilters,
TraceFiltersFromContext). These were previously defined in
internal/tui, forcing the core package to import the TUI layer.
- internal/streamrow: add RingBuffer (moved from internal/tui/eventstream)
so the core tracing engine can use the ring buffer without importing
the TUI layer.
- internal/tui/eventstream/ringbuffer.go: change to a thin re-export of
streamrow.RingBuffer via a type alias, preserving the existing API for
all callers within the TUI layer.
- internal/tui/tui.go: replace locally-defined interface declarations
(TraceStarter, SnapshotSource, ProbeManager, RuntimePublisher,
RuntimeState, TraceRuntimeBindings) with type aliases from
internal/runtime. Delegate all context helper functions to runtime.
- internal/ior.go, internal/ior_bpfsetup.go: remove imports of
internal/tui and internal/tui/eventstream; use internal/runtime and
internal/streamrow instead. Add SetTUIRunners injection point so the
concrete TUI runner functions are wired in by cmd/ior/main.go.
- cmd/ior/main.go: call internal.SetTUIRunners with the concrete TUI
runner functions before internal.Run, completing the wiring without
creating a cycle.
- Test files (internal/ior_mode_test.go, internal/bench_pipeline_test.go):
updated to use runtime.* and streamrow.* types in place of tui.* and
eventstream.* types.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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