src/mgr/Inquirer.cc

   1 /*
   2  * Copyright (C) 1996-2017 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 /* DEBUG: section 16    Cache Manager API */
  10
  11 #include "squid.h"
  12 #include "base/TextException.h"
  13 #include "comm.h"
  14 #include "comm/Connection.h"
  15 #include "comm/Write.h"
  16 #include "CommCalls.h"
  17 #include "errorpage.h"
  18 #include "HttpReply.h"
  19 #include "HttpRequest.h"
  20 #include "ipc/UdsOp.h"
  21 #include "mgr/ActionWriter.h"
  22 #include "mgr/Command.h"
  23 #include "mgr/Inquirer.h"
  24 #include "mgr/IntParam.h"
  25 #include "mgr/Request.h"
  26 #include "mgr/Response.h"
  27 #include "SquidTime.h"
  28 #include <memory>
  29 #include <algorithm>
  30
  31 CBDATA_NAMESPACED_CLASS_INIT(Mgr, Inquirer);
  32
  33 Mgr::Inquirer::Inquirer(Action::Pointer anAction,
  34                         const Request &aCause, const Ipc::StrandCoords &coords):
  35     Ipc::Inquirer(aCause.clone(), applyQueryParams(coords, aCause.params.queryParams), anAction->atomic() ? 10 : 100),
  36     aggrAction(anAction)
  37 {
  38     conn = aCause.conn;
  39     Ipc::ImportFdIntoComm(conn, SOCK_STREAM, IPPROTO_TCP, Ipc::fdnHttpSocket);
  40
  41     debugs(16, 5, HERE << conn << " action: " << aggrAction);
  42
  43     closer = asyncCall(16, 5, "Mgr::Inquirer::noteCommClosed",
  44                        CommCbMemFunT<Inquirer, CommCloseCbParams>(this, &Inquirer::noteCommClosed));
  45     comm_add_close_handler(conn->fd, closer);
  46 }
  47
  48 /// closes our copy of the client HTTP connection socket
  49 void
  50 Mgr::Inquirer::cleanup()
  51 {
  52     if (Comm::IsConnOpen(conn)) {
  53         removeCloseHandler();
  54         conn->close();
  55     }
  56 }
  57
  58 void
  59 Mgr::Inquirer::removeCloseHandler()
  60 {
  61     if (closer != NULL) {
  62         comm_remove_close_handler(conn->fd, closer);
  63         closer = NULL;
  64     }
  65 }
  66
  67 void
  68 Mgr::Inquirer::start()
  69 {
  70     debugs(16, 5, HERE);
  71     Ipc::Inquirer::start();
  72     Must(Comm::IsConnOpen(conn));
  73     Must(aggrAction != NULL);
  74
  75     std::unique_ptr<MemBuf> replyBuf;
  76     if (strands.empty()) {
  77         LOCAL_ARRAY(char, url, MAX_URL);
  78         snprintf(url, MAX_URL, "%s", aggrAction->command().params.httpUri.termedBuf());
  79         const MasterXaction::Pointer mx = new MasterXaction(XactionInitiator::initIpc);
  80         HttpRequest *req = HttpRequest::FromUrl(url, mx);
  81         ErrorState err(ERR_INVALID_URL, Http::scNotFound, req);
  82         std::unique_ptr<HttpReply> reply(err.BuildHttpReply());
  83         replyBuf.reset(reply->pack());
  84     } else {
  85         std::unique_ptr<HttpReply> reply(new HttpReply);
  86         reply->setHeaders(Http::scOkay, NULL, "text/plain", -1, squid_curtime, squid_curtime);
  87         reply->header.putStr(Http::HdrType::CONNECTION, "close"); // until we chunk response
  88         replyBuf.reset(reply->pack());
  89     }
  90     writer = asyncCall(16, 5, "Mgr::Inquirer::noteWroteHeader",
  91                        CommCbMemFunT<Inquirer, CommIoCbParams>(this, &Inquirer::noteWroteHeader));
  92     Comm::Write(conn, replyBuf.get(), writer);
  93 }
  94
  95 /// called when we wrote the response header
  96 void
  97 Mgr::Inquirer::noteWroteHeader(const CommIoCbParams& params)
  98 {
  99     debugs(16, 5, HERE);
 100     writer = NULL;
 101     Must(params.flag == Comm::OK);
 102     Must(params.conn.getRaw() == conn.getRaw());
 103     Must(params.size != 0);
 104     // start inquiries at the initial pos
 105     inquire();
 106 }
 107
 108 /// called when the HTTP client or some external force closed our socket
 109 void
 110 Mgr::Inquirer::noteCommClosed(const CommCloseCbParams& params)
 111 {
 112     debugs(16, 5, HERE);
 113     Must(!Comm::IsConnOpen(conn) && params.conn.getRaw() == conn.getRaw());
 114     conn = NULL;
 115     mustStop("commClosed");
 116 }
 117
 118 bool
 119 Mgr::Inquirer::aggregate(Ipc::Response::Pointer aResponse)
 120 {
 121     Mgr::Response& response = static_cast<Response&>(*aResponse);
 122     if (response.hasAction())
 123         aggrAction->add(response.getAction());
 124     return true;
 125 }
 126
 127 void
 128 Mgr::Inquirer::sendResponse()
 129 {
 130     if (!strands.empty() && aggrAction->aggregatable()) {
 131         removeCloseHandler();
 132         AsyncJob::Start(new ActionWriter(aggrAction, conn));
 133         conn = NULL; // should not close because we passed it to ActionWriter
 134     }
 135 }
 136
 137 bool
 138 Mgr::Inquirer::doneAll() const
 139 {
 140     return !writer && Ipc::Inquirer::doneAll();
 141 }
 142
 143 Ipc::StrandCoords
 144 Mgr::Inquirer::applyQueryParams(const Ipc::StrandCoords& aStrands, const QueryParams& aParams)
 145 {
 146     Ipc::StrandCoords sc;
 147
 148     QueryParam::Pointer processesParam = aParams.get("processes");
 149     QueryParam::Pointer workersParam = aParams.get("workers");
 150
 151     if (processesParam == NULL || workersParam == NULL) {
 152         if (processesParam != NULL) {
 153             IntParam* param = dynamic_cast<IntParam*>(processesParam.getRaw());
 154             if (param != NULL && param->type == QueryParam::ptInt) {
 155                 const std::vector<int>& processes = param->value();
 156                 for (Ipc::StrandCoords::const_iterator iter = aStrands.begin();
 157                         iter != aStrands.end(); ++iter) {
 158                     if (std::find(processes.begin(), processes.end(), iter->kidId) != processes.end())
 159                         sc.push_back(*iter);
 160                 }
 161             }
 162         } else if (workersParam != NULL) {
 163             IntParam* param = dynamic_cast<IntParam*>(workersParam.getRaw());
 164             if (param != NULL && param->type == QueryParam::ptInt) {
 165                 const std::vector<int>& workers = param->value();
 166                 for (int i = 0; i < (int)aStrands.size(); ++i) {
 167                     if (std::find(workers.begin(), workers.end(), i + 1) != workers.end())
 168                         sc.push_back(aStrands[i]);
 169                 }
 170             }
 171         } else {
 172             sc = aStrands;
 173         }
 174     }
 175
 176     debugs(16, 4, HERE << "strands kid IDs = ");
 177     for (Ipc::StrandCoords::const_iterator iter = sc.begin(); iter != sc.end(); ++iter) {
 178         debugs(16, 4, HERE << iter->kidId);
 179     }
 180
 181     return sc;
 182 }
 183