| package poller |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import ( |
| "errors" |
| "fmt" |
| "io/ioutil" |
| "net/http" |
| "time" |
| |
| "github.com/apache/trafficcontrol/lib/go-log" |
| "github.com/apache/trafficcontrol/traffic_monitor/config" |
| ) |
| |
| const PollerTypeHTTP = "http" |
| |
| func init() { |
| AddPollerType(PollerTypeHTTP, httpGlobalInit, httpInit, httpPoll) |
| } |
| |
| func httpGlobalInit(cfg config.Config, appData config.StaticAppData) interface{} { |
| sharedClient := &http.Client{ |
| Transport: &http.Transport{}, |
| Timeout: cfg.HTTPTimeout, |
| } |
| return &HTTPPollGlobalCtx{ |
| UserAgent: appData.UserAgent, |
| Client: sharedClient, |
| FormatAccept: cfg.HTTPPollingFormat, |
| } |
| } |
| |
| func httpInit(cfg PollerConfig, globalCtxI interface{}) interface{} { |
| gctx := (globalCtxI).(*HTTPPollGlobalCtx) |
| |
| if cfg.Timeout != 0 || cfg.NoKeepAlive { // if the timeout isn't explicitly set, use the template value. |
| clientCopy := *gctx.Client |
| gctx.Client = &clientCopy // copy the client, so it's reused by pollers who DO use the default timeout/keepalive |
| if cfg.Timeout != 0 { |
| gctx.Client.Timeout = cfg.Timeout |
| } |
| if cfg.NoKeepAlive { |
| transportI := http.DefaultTransport |
| transport, ok := transportI.(*http.Transport) |
| if !ok { |
| log.Errorf("failed to set NoKeepAlive for poller ID '%s': http.DefaultTransport expected type *http.Transport actual %T\n", cfg.PollerID, transportI) |
| } else { |
| transport.DisableKeepAlives = cfg.NoKeepAlive |
| gctx.Client.Transport = transport |
| log.Infof("Setting transport.DisableKeepAlives %t for %s\n", transport.DisableKeepAlives, cfg.PollerID) |
| } |
| } |
| } |
| |
| return &HTTPPollCtx{ |
| Client: gctx.Client, |
| UserAgent: gctx.UserAgent, |
| NoKeepAlive: cfg.NoKeepAlive, |
| PollerID: cfg.PollerID, |
| FormatAccept: gctx.FormatAccept, |
| } |
| } |
| |
| type HTTPPollGlobalCtx struct { |
| Client *http.Client |
| UserAgent string |
| FormatAccept string |
| } |
| |
| type HTTPPollCtx struct { |
| Client *http.Client |
| UserAgent string |
| NoKeepAlive bool |
| PollerID string |
| HTTPHeader http.Header |
| FormatAccept string |
| } |
| |
| func httpPoll(ctxI interface{}, url string, host string, pollID uint64) ([]byte, time.Time, time.Duration, error) { |
| ctx := (ctxI).(*HTTPPollCtx) |
| req, err := http.NewRequest("GET", url, nil) |
| if err != nil { |
| return nil, time.Now(), 0, errors.New("creating HTTP request: " + err.Error()) |
| } |
| req.Header.Set("User-Agent", ctx.UserAgent) |
| if !ctx.NoKeepAlive { |
| req.Header.Set("Connection", "keep-alive") |
| } |
| |
| req.Header.Set("Accept", ctx.FormatAccept) |
| req.Host = host |
| startReq := time.Now() |
| resp, err := ctx.Client.Do(req) |
| if err != nil { |
| reqEnd := time.Now() |
| reqTime := reqEnd.Sub(startReq) // note this is the time to transfer the entire body, not just the roundtrip |
| return nil, reqEnd, reqTime, fmt.Errorf("id %v url %v fetch error: %v", ctx.PollerID, url, err) |
| } |
| defer resp.Body.Close() |
| |
| if resp.StatusCode < 200 || resp.StatusCode > 299 { |
| reqEnd := time.Now() |
| reqTime := reqEnd.Sub(startReq) // note this is the time to transfer the entire body, not just the roundtrip |
| return nil, reqEnd, reqTime, fmt.Errorf("id %v url %v fetch error: bad HTTP status: %v", ctx.PollerID, url, resp.StatusCode) |
| } |
| |
| bts, err := ioutil.ReadAll(resp.Body) |
| if err != nil { |
| reqEnd := time.Now() |
| reqTime := reqEnd.Sub(startReq) // note this is the time to transfer the entire body, not just the roundtrip |
| return nil, reqEnd, reqTime, fmt.Errorf("id %v url %v fetch error: reading body: %v", ctx.PollerID, url, err) |
| } |
| reqEnd := time.Now() |
| reqTime := reqEnd.Sub(startReq) // note this is the time to transfer the entire body, not just the roundtrip |
| ctx.HTTPHeader = resp.Header.Clone() |
| return bts, reqEnd, reqTime, nil |
| } |