3c0c5ed4e0
godep restore pushd $GOPATH/src/github.com/appc/spec git co master popd go get go4.org/errorutil rm -rf Godeps godep save ./... git add vendor git add -f $(git ls-files --other vendor/) git co -- Godeps/LICENSES Godeps/.license_file_state Godeps/OWNERS
66 lines
2.0 KiB
Go
66 lines
2.0 KiB
Go
package main
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import (
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"github.com/emicklei/go-restful"
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"io"
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"log"
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"os"
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"runtime/pprof"
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)
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// ProfilingService is a WebService that can start/stop a CPU profile and write results to a file
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// GET /{rootPath}/start will activate CPU profiling
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// GET /{rootPath}/stop will stop profiling
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//
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// NewProfileService("/profiler", "ace.prof").AddWebServiceTo(restful.DefaultContainer)
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//
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type ProfilingService struct {
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rootPath string // the base (root) of the service, e.g. /profiler
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cpuprofile string // the output filename to write profile results, e.g. myservice.prof
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cpufile *os.File // if not nil, then profiling is active
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}
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func NewProfileService(rootPath string, outputFilename string) *ProfilingService {
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ps := new(ProfilingService)
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ps.rootPath = rootPath
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ps.cpuprofile = outputFilename
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return ps
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}
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// Add this ProfileService to a restful Container
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func (p ProfilingService) AddWebServiceTo(container *restful.Container) {
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ws := new(restful.WebService)
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ws.Path(p.rootPath).Consumes("*/*").Produces(restful.MIME_JSON)
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ws.Route(ws.GET("/start").To(p.startProfiler))
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ws.Route(ws.GET("/stop").To(p.stopProfiler))
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container.Add(ws)
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}
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func (p *ProfilingService) startProfiler(req *restful.Request, resp *restful.Response) {
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if p.cpufile != nil {
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io.WriteString(resp.ResponseWriter, "[restful] CPU profiling already running")
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return // error?
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}
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cpufile, err := os.Create(p.cpuprofile)
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if err != nil {
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log.Fatal(err)
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}
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// remember for close
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p.cpufile = cpufile
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pprof.StartCPUProfile(cpufile)
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io.WriteString(resp.ResponseWriter, "[restful] CPU profiling started, writing on:"+p.cpuprofile)
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}
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func (p *ProfilingService) stopProfiler(req *restful.Request, resp *restful.Response) {
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if p.cpufile == nil {
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io.WriteString(resp.ResponseWriter, "[restful] CPU profiling not active")
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return // error?
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}
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pprof.StopCPUProfile()
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p.cpufile.Close()
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p.cpufile = nil
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io.WriteString(resp.ResponseWriter, "[restful] CPU profiling stopped, closing:"+p.cpuprofile)
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}
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func main() {} // exists for example compilation only
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