18ebb2318a
In conjunction with soong/build changes, this materialized runtime metrics for various soong_build events. Test: Manually verified materialized protos for bp2build, mixed builds, and legacy build. Change-Id: Ia92403605e3063028dbf6a1ded8449c190b9e63e
104 lines
3.6 KiB
Go
104 lines
3.6 KiB
Go
// Copyright 2022 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package metrics
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import (
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"fmt"
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"strings"
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"time"
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)
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// EventHandler tracks nested events and their start/stop times in a single
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// thread.
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type EventHandler struct {
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completedEvents []Event
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// These fields handle event scoping. When starting a new event, a new entry
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// is pushed onto these fields. When ending an event, these fields are popped.
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scopeIds []string
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scopeStartTimes []time.Time
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}
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// _now wraps the time.Now() function. _now is declared for unit testing purpose.
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var _now = func() time.Time {
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return time.Now()
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}
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// Event holds the performance metrics data of a single build event.
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type Event struct {
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// A unique human-readable identifier / "name" for the build event. Event
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// names use period-delimited scoping. For example, if an event alpha starts,
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// then an event bravo starts, then an event charlie starts and ends, the
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// unique identifier for charlie will be 'alpha.bravo.charlie'.
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Id string
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Start time.Time
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end time.Time
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}
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// RuntimeNanoseconds returns the number of nanoseconds between the start
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// and end times of the event.
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func (e Event) RuntimeNanoseconds() uint64 {
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return uint64(e.end.Sub(e.Start).Nanoseconds())
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}
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// Begin logs the start of an event. This must be followed by a corresponding
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// call to End (though other events may begin and end before this event ends).
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// Events within the same scope must have unique names.
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func (h *EventHandler) Begin(name string) {
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h.scopeIds = append(h.scopeIds, name)
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h.scopeStartTimes = append(h.scopeStartTimes, _now())
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}
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// End logs the end of an event. All events nested within this event must have
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// themselves been marked completed.
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func (h *EventHandler) End(name string) {
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if len(h.scopeIds) == 0 || name != h.scopeIds[len(h.scopeIds)-1] {
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panic(fmt.Errorf("Unexpected scope end '%s'. Current scope: (%s)",
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name, h.scopeIds))
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}
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event := Event{
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// The event Id is formed from the period-delimited scope names of all
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// active events (e.g. `alpha.beta.charlie`). See Event.Id documentation
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// for more detail.
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Id: strings.Join(h.scopeIds, "."),
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Start: h.scopeStartTimes[len(h.scopeStartTimes)-1],
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end: _now(),
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}
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h.completedEvents = append(h.completedEvents, event)
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h.scopeIds = h.scopeIds[:len(h.scopeIds)-1]
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h.scopeStartTimes = h.scopeStartTimes[:len(h.scopeStartTimes)-1]
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}
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// CompletedEvents returns all events which have been completed, after
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// validation.
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// It is an error to call this method if there are still ongoing events, or
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// if two events were completed with the same scope and name.
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func (h *EventHandler) CompletedEvents() []Event {
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if len(h.scopeIds) > 0 {
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panic(fmt.Errorf(
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"Retrieving events before all events have been closed. Current scope: (%s)",
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h.scopeIds))
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}
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// Validate no two events have the same full id.
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ids := map[string]bool{}
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for _, event := range h.completedEvents {
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if _, containsId := ids[event.Id]; containsId {
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panic(fmt.Errorf("Duplicate event registered: %s", event.Id))
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}
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ids[event.Id] = true
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}
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return h.completedEvents
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}
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