126 lines
2.9 KiB
Go
126 lines
2.9 KiB
Go
// Copyright 2015 The Prometheus Authors
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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 main
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import (
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"bytes"
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"fmt"
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"net/http"
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"os"
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"github.com/google/pprof/profile"
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)
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type debugWriterConfig struct {
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serverURL string
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tarballName string
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pathToFileName map[string]string
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postProcess func(b []byte) ([]byte, error)
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}
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type debugWriter struct {
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archiver
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httpClient
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requestToFile map[*http.Request]string
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postProcess func(b []byte) ([]byte, error)
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}
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func newDebugWriter(cfg debugWriterConfig) (*debugWriter, error) {
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client, err := newPrometheusHTTPClient(cfg.serverURL)
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if err != nil {
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return nil, err
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}
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archiver, err := newTarGzFileWriter(cfg.tarballName)
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if err != nil {
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return nil, err
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}
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reqs := make(map[*http.Request]string)
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for path, filename := range cfg.pathToFileName {
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req, err := http.NewRequest(http.MethodGet, client.urlJoin(path), nil)
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if err != nil {
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return nil, err
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}
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reqs[req] = filename
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}
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return &debugWriter{
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archiver,
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client,
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reqs,
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cfg.postProcess,
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}, nil
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}
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func (w *debugWriter) Write() int {
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for req, filename := range w.requestToFile {
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_, body, err := w.do(req)
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if err != nil {
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fmt.Fprintln(os.Stderr, "error executing HTTP request:", err)
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return 1
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}
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buf, err := w.postProcess(body)
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if err != nil {
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fmt.Fprintln(os.Stderr, "error post-processing HTTP response body:", err)
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return 1
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}
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if err := w.archiver.write(filename, buf); err != nil {
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fmt.Fprintln(os.Stderr, "error writing into archive:", err)
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return 1
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}
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}
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if err := w.close(); err != nil {
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fmt.Fprintln(os.Stderr, "error closing archiver:", err)
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return 1
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}
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fmt.Printf("Compiling debug information complete, all files written in %q.\n", w.filename())
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return 0
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}
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func validate(b []byte) (*profile.Profile, error) {
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p, err := profile.Parse(bytes.NewReader(b))
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if err != nil {
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return nil, err
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}
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return p, nil
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}
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var pprofPostProcess = func(b []byte) ([]byte, error) {
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p, err := validate(b)
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if err != nil {
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return nil, err
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}
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var buf bytes.Buffer
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if err := p.WriteUncompressed(&buf); err != nil {
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return nil, err
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}
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fmt.Println(p.String())
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return buf.Bytes(), nil
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}
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var metricsPostProcess = func(b []byte) ([]byte, error) {
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fmt.Println(string(b))
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return b, nil
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}
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var allPostProcess = func(b []byte) ([]byte, error) {
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_, err := validate(b)
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if err != nil {
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return metricsPostProcess(b)
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}
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return pprofPostProcess(b)
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}
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