105 lines
2.5 KiB
Go
105 lines
2.5 KiB
Go
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// Copyright 2020 Coinbase, Inc.
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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 utils
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import (
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"context"
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"runtime"
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"time"
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sdkUtils "github.com/coinbase/rosetta-sdk-go/utils"
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"github.com/grpc-ecosystem/go-grpc-middleware/logging/zap/ctxzap"
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"go.uber.org/zap"
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)
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const (
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// monitorMemorySleep is how long we should sleep
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// between checking memory stats.
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monitorMemorySleep = 50 * time.Millisecond
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)
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// ExtractLogger returns a sugared logger with the origin
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// tag added.
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func ExtractLogger(ctx context.Context, origin string) *zap.SugaredLogger {
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logger := ctxzap.Extract(ctx)
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if len(origin) > 0 {
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logger = logger.Named(origin)
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}
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return logger.Sugar()
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}
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// ContextSleep sleeps for the provided duration and returns
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// an error if context is canceled.
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func ContextSleep(ctx context.Context, duration time.Duration) error {
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timer := time.NewTimer(duration)
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defer timer.Stop()
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for {
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-timer.C:
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return nil
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}
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}
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}
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// MonitorMemoryUsage periodically logs memory usage
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// stats and triggers garbage collection when heap allocations
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// surpass maxHeapUsage.
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func MonitorMemoryUsage(
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ctx context.Context,
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maxHeapUsage int,
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) error {
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logger := ExtractLogger(ctx, "memory")
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maxHeap := float64(0)
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garbageCollections := uint32(0)
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for ctx.Err() == nil {
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var m runtime.MemStats
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runtime.ReadMemStats(&m)
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heapAlloc := float64(m.HeapAlloc)
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if heapAlloc > maxHeap {
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maxHeap = heapAlloc
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}
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heapAllocMB := sdkUtils.BtoMb(heapAlloc)
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if heapAllocMB > float64(maxHeapUsage) {
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runtime.GC()
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}
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if m.NumGC > garbageCollections {
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garbageCollections = m.NumGC
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logger.Debugw(
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"stats",
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"heap (MB)", heapAllocMB,
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"max heap (MB)", sdkUtils.BtoMb(maxHeap),
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"stack (MB)", sdkUtils.BtoMb(float64(m.StackInuse)),
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"system (MB)", sdkUtils.BtoMb(float64(m.Sys)),
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"garbage collections", m.NumGC,
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)
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}
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if err := ContextSleep(ctx, monitorMemorySleep); err != nil {
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return err
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}
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}
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return ctx.Err()
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}
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