content/browser/service_worker/service_worker_process_manager.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/service_worker/service_worker_process_manager.h"
   6
   7 #include "content/browser/renderer_host/render_process_host_impl.h"
   8 #include "content/browser/service_worker/service_worker_context_wrapper.h"
   9 #include "content/public/browser/browser_thread.h"
  10 #include "content/public/browser/site_instance.h"
  11 #include "url/gurl.h"
  12
  13 namespace content {
  14
  15 namespace {
  16
  17 // Functor to sort by the .second element of a struct.
  18 struct SecondGreater {
  19   template <typename Value>
  20   bool operator()(const Value& lhs, const Value& rhs) {
  21     return lhs.second > rhs.second;
  22   }
  23 };
  24
  25 }  // namespace
  26
  27 static bool IncrementWorkerRefCountByPid(int process_id) {
  28   RenderProcessHost* rph = RenderProcessHost::FromID(process_id);
  29   if (!rph || rph->FastShutdownStarted())
  30     return false;
  31
  32   static_cast<RenderProcessHostImpl*>(rph)->IncrementWorkerRefCount();
  33   return true;
  34 }
  35
  36 ServiceWorkerProcessManager::ProcessInfo::ProcessInfo(
  37     const scoped_refptr<SiteInstance>& site_instance)
  38     : site_instance(site_instance),
  39       process_id(site_instance->GetProcess()->GetID()) {
  40 }
  41
  42 ServiceWorkerProcessManager::ProcessInfo::ProcessInfo(int process_id)
  43     : process_id(process_id) {
  44 }
  45
  46 ServiceWorkerProcessManager::ProcessInfo::~ProcessInfo() {
  47 }
  48
  49 ServiceWorkerProcessManager::ServiceWorkerProcessManager(
  50     BrowserContext* browser_context)
  51     : browser_context_(browser_context),
  52       process_id_for_test_(-1),
  53       weak_this_factory_(this) {
  54   weak_this_ = weak_this_factory_.GetWeakPtr();
  55 }
  56
  57 ServiceWorkerProcessManager::~ServiceWorkerProcessManager() {
  58   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  59   DCHECK(browser_context_ == NULL)
  60       << "Call Shutdown() before destroying |this|, so that racing method "
  61       << "invocations don't use a destroyed BrowserContext.";
  62 }
  63
  64 void ServiceWorkerProcessManager::Shutdown() {
  65   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  66   browser_context_ = NULL;
  67   for (std::map<int, ProcessInfo>::const_iterator it = instance_info_.begin();
  68        it != instance_info_.end();
  69        ++it) {
  70     RenderProcessHost* rph = RenderProcessHost::FromID(it->second.process_id);
  71     DCHECK(rph);
  72     static_cast<RenderProcessHostImpl*>(rph)->DecrementWorkerRefCount();
  73   }
  74   instance_info_.clear();
  75 }
  76
  77 void ServiceWorkerProcessManager::AddProcessReferenceToPattern(
  78     const GURL& pattern, int process_id) {
  79   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
  80     BrowserThread::PostTask(
  81         BrowserThread::UI,
  82         FROM_HERE,
  83         base::Bind(&ServiceWorkerProcessManager::AddProcessReferenceToPattern,
  84                    weak_this_,
  85                    pattern,
  86                    process_id));
  87     return;
  88   }
  89
  90   ProcessRefMap& process_refs = pattern_processes_[pattern];
  91   ++process_refs[process_id];
  92 }
  93
  94 void ServiceWorkerProcessManager::RemoveProcessReferenceFromPattern(
  95     const GURL& pattern, int process_id) {
  96   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
  97     BrowserThread::PostTask(
  98         BrowserThread::UI,
  99         FROM_HERE,
 100         base::Bind(
 101           &ServiceWorkerProcessManager::RemoveProcessReferenceFromPattern,
 102           weak_this_,
 103           pattern,
 104           process_id));
 105     return;
 106   }
 107
 108   PatternProcessRefMap::iterator it = pattern_processes_.find(pattern);
 109   if (it == pattern_processes_.end()) {
 110     NOTREACHED() << "process refrences not found for pattern: " << pattern;
 111     return;
 112   }
 113   ProcessRefMap& process_refs = it->second;
 114   ProcessRefMap::iterator found = process_refs.find(process_id);
 115   if (found == process_refs.end()) {
 116     NOTREACHED() << "Releasing unknown process ref " << process_id;
 117     return;
 118   }
 119   if (--found->second == 0) {
 120     process_refs.erase(found);
 121     if (process_refs.empty())
 122       pattern_processes_.erase(it);
 123   }
 124 }
 125
 126 bool ServiceWorkerProcessManager::PatternHasProcessToRun(
 127     const GURL& pattern) const {
 128   PatternProcessRefMap::const_iterator it = pattern_processes_.find(pattern);
 129   if (it == pattern_processes_.end())
 130     return false;
 131   return !it->second.empty();
 132 }
 133
 134 void ServiceWorkerProcessManager::AllocateWorkerProcess(
 135     int embedded_worker_id,
 136     const GURL& pattern,
 137     const GURL& script_url,
 138     const base::Callback<void(ServiceWorkerStatusCode, int process_id)>&
 139         callback) {
 140   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
 141     BrowserThread::PostTask(
 142         BrowserThread::UI,
 143         FROM_HERE,
 144         base::Bind(&ServiceWorkerProcessManager::AllocateWorkerProcess,
 145                    weak_this_,
 146                    embedded_worker_id,
 147                    pattern,
 148                    script_url,
 149                    callback));
 150     return;
 151   }
 152
 153   if (process_id_for_test_ != -1) {
 154     // Let tests specify the returned process ID. Note: We may need to be able
 155     // to specify the error code too.
 156     BrowserThread::PostTask(
 157         BrowserThread::IO,
 158         FROM_HERE,
 159         base::Bind(callback, SERVICE_WORKER_OK, process_id_for_test_));
 160     return;
 161   }
 162
 163   DCHECK(!ContainsKey(instance_info_, embedded_worker_id))
 164       << embedded_worker_id << " already has a process allocated";
 165
 166   std::vector<int> sorted_candidates = SortProcessesForPattern(pattern);
 167   for (std::vector<int>::const_iterator it = sorted_candidates.begin();
 168        it != sorted_candidates.end();
 169        ++it) {
 170     if (!IncrementWorkerRefCountByPid(*it))
 171       continue;
 172     instance_info_.insert(
 173         std::make_pair(embedded_worker_id, ProcessInfo(*it)));
 174     BrowserThread::PostTask(BrowserThread::IO,
 175                             FROM_HERE,
 176                             base::Bind(callback, SERVICE_WORKER_OK, *it));
 177     return;
 178   }
 179
 180   if (!browser_context_) {
 181     // Shutdown has started.
 182     BrowserThread::PostTask(
 183         BrowserThread::IO,
 184         FROM_HERE,
 185         base::Bind(callback, SERVICE_WORKER_ERROR_START_WORKER_FAILED, -1));
 186     return;
 187   }
 188   // No existing processes available; start a new one.
 189   scoped_refptr<SiteInstance> site_instance =
 190       SiteInstance::CreateForURL(browser_context_, script_url);
 191   RenderProcessHost* rph = site_instance->GetProcess();
 192   // This Init() call posts a task to the IO thread that adds the RPH's
 193   // ServiceWorkerDispatcherHost to the
 194   // EmbeddedWorkerRegistry::process_sender_map_.
 195   if (!rph->Init()) {
 196     LOG(ERROR) << "Couldn't start a new process!";
 197     BrowserThread::PostTask(
 198         BrowserThread::IO,
 199         FROM_HERE,
 200         base::Bind(callback, SERVICE_WORKER_ERROR_START_WORKER_FAILED, -1));
 201     return;
 202   }
 203
 204   instance_info_.insert(
 205       std::make_pair(embedded_worker_id, ProcessInfo(site_instance)));
 206
 207   static_cast<RenderProcessHostImpl*>(rph)->IncrementWorkerRefCount();
 208   BrowserThread::PostTask(
 209       BrowserThread::IO,
 210       FROM_HERE,
 211       base::Bind(callback, SERVICE_WORKER_OK, rph->GetID()));
 212 }
 213
 214 void ServiceWorkerProcessManager::ReleaseWorkerProcess(int embedded_worker_id) {
 215   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
 216     BrowserThread::PostTask(
 217         BrowserThread::UI,
 218         FROM_HERE,
 219         base::Bind(&ServiceWorkerProcessManager::ReleaseWorkerProcess,
 220                    weak_this_,
 221                    embedded_worker_id));
 222     return;
 223   }
 224   if (process_id_for_test_ != -1) {
 225     // Unittests don't increment or decrement the worker refcount of a
 226     // RenderProcessHost.
 227     return;
 228   }
 229   if (browser_context_ == NULL) {
 230     // Shutdown already released all instances.
 231     DCHECK(instance_info_.empty());
 232     return;
 233   }
 234   std::map<int, ProcessInfo>::iterator info =
 235       instance_info_.find(embedded_worker_id);
 236   DCHECK(info != instance_info_.end());
 237   RenderProcessHost* rph = NULL;
 238   if (info->second.site_instance.get()) {
 239     rph = info->second.site_instance->GetProcess();
 240     DCHECK_EQ(info->second.process_id, rph->GetID())
 241         << "A SiteInstance's process shouldn't get destroyed while we're "
 242            "holding a reference to it. Was the reference actually held?";
 243   } else {
 244     rph = RenderProcessHost::FromID(info->second.process_id);
 245     DCHECK(rph)
 246         << "Process " << info->second.process_id
 247         << " was destroyed unexpectedly. Did we actually hold a reference?";
 248   }
 249   static_cast<RenderProcessHostImpl*>(rph)->DecrementWorkerRefCount();
 250   instance_info_.erase(info);
 251 }
 252
 253 std::vector<int> ServiceWorkerProcessManager::SortProcessesForPattern(
 254     const GURL& pattern) const {
 255   PatternProcessRefMap::const_iterator it = pattern_processes_.find(pattern);
 256   if (it == pattern_processes_.end())
 257     return std::vector<int>();
 258
 259   std::vector<std::pair<int, int> > counted(
 260       it->second.begin(), it->second.end());
 261   std::sort(counted.begin(), counted.end(), SecondGreater());
 262
 263   std::vector<int> result(counted.size());
 264   for (size_t i = 0; i < counted.size(); ++i)
 265     result[i] = counted[i].first;
 266   return result;
 267 }
 268
 269 }  // namespace content
 270
 271 namespace base {
 272 // Destroying ServiceWorkerProcessManagers only on the UI thread allows the
 273 // member WeakPtr to safely guard the object's lifetime when used on that
 274 // thread.
 275 void DefaultDeleter<content::ServiceWorkerProcessManager>::operator()(
 276     content::ServiceWorkerProcessManager* ptr) const {
 277   content::BrowserThread::DeleteSoon(
 278       content::BrowserThread::UI, FROM_HERE, ptr);
 279 }
 280 }  // namespace base