chrome网络栈 develop tools 查看缓存

所有chrome内部使用协议查看：

chrome://chrome-urls/

chrome缓存查看器：

http://www.nirsoft.net/utils/chrome_cache_view.html

Chrome DevTools Frontend 运行原理浅析

深入理解 Chrome DevTools

D:develectron7srcurlurl_constants.cc 放着http https file等协议定义。

获取缓存（基于chrome 66）

loop异步获取所有cache：src eturl_requestview_cache_helper.cc

int ViewCacheHelper::DoLoop(int result) {
  DCHECK(next_state_ != STATE_NONE);

  int rv = result;
  do {
    State state = next_state_;
    next_state_ = STATE_NONE;
    switch (state) {
      case STATE_GET_BACKEND:
        DCHECK_EQ(OK, rv);
        rv = DoGetBackend();
        break;
      case STATE_GET_BACKEND_COMPLETE:
        rv = DoGetBackendComplete(rv);
        break;
      case STATE_OPEN_NEXT_ENTRY:
        DCHECK_EQ(OK, rv);
        rv = DoOpenNextEntry();
        break;
      case STATE_OPEN_NEXT_ENTRY_COMPLETE:
        rv = DoOpenNextEntryComplete(rv);
        break;
      case STATE_OPEN_ENTRY:
        DCHECK_EQ(OK, rv);
        rv = DoOpenEntry();
        break;
      case STATE_OPEN_ENTRY_COMPLETE:
        rv = DoOpenEntryComplete(rv);
        break;
      case STATE_READ_RESPONSE:
        DCHECK_EQ(OK, rv);
        rv = DoReadResponse();
        break;
      case STATE_READ_RESPONSE_COMPLETE:
        rv = DoReadResponseComplete(rv);
        break;
      case STATE_READ_DATA:
        DCHECK_EQ(OK, rv);
        rv = DoReadData();
        break;
      case STATE_READ_DATA_COMPLETE:
        rv = DoReadDataComplete(rv);
        break;

      default:
        NOTREACHED() << "bad state";
        rv = ERR_FAILED;
        break;
    }
  } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);

  if (rv != ERR_IO_PENDING)
    HandleResult(rv);

  return rv;
}

int ViewCacheHelper::DoGetBackend() {
  next_state_ = STATE_GET_BACKEND_COMPLETE;

  if (!context_->http_transaction_factory())
    return ERR_FAILED;

  HttpCache* http_cache = context_->http_transaction_factory()->GetCache();
  if (!http_cache)
    return ERR_FAILED;

  return http_cache->GetBackend(
      &disk_cache_, base::Bind(&ViewCacheHelper::OnIOComplete,
                               base::Unretained(this)));
}

mem_backend_impl.cc从iter里面遍历出某项，里面包含url，对应的数据entry_iter->second;：

class MemBackendImpl::MemIterator final : public Backend::Iterator {
 public:
  explicit MemIterator(base::WeakPtr<MemBackendImpl> backend)
      : backend_(backend) {}

  int OpenNextEntry(Entry** next_entry,
                    const CompletionCallback& callback) override {
    if (!backend_)
      return net::ERR_FAILED;

    if (!backend_keys_) {
      backend_keys_ = std::make_unique<Strings>(backend_->entries_.size());
      for (const auto& iter : backend_->entries_)
        backend_keys_->push_back(iter.first);
      current_ = backend_keys_->begin();
    } else {
      current_++;
    }

    while (true) {
      if (current_ == backend_keys_->end()) {
        *next_entry = nullptr;
        backend_keys_.reset();
        return net::ERR_FAILED;
      }

      const auto& entry_iter = backend_->entries_.find(*current_);
      if (entry_iter == backend_->entries_.end()) {
        // The key is no longer in the cache, move on to the next key.
        current_++;
        continue;
      }

      entry_iter->second->Open();
      *next_entry = entry_iter->second;
      return net::OK;
    }
  }

 chrome 75：

chrome协议：D:develectron7srccontentpubliccommonurl_constants.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "build/build_config.h"
#include "content/public/common/url_constants.h"

namespace content {

// Before adding new chrome schemes please check with security@chromium.org.
// There are security implications associated with introducing new schemes.
const char kChromeDevToolsScheme[] = "devtools";
const char kChromeErrorScheme[] = "chrome-error";
const char kChromeUIScheme[] = "chrome";
const char kGuestScheme[] = "chrome-guest";
const char kViewSourceScheme[] = "view-source";
#if defined(OS_CHROMEOS)
const char kExternalFileScheme[] = "externalfile";
#endif
const char kGoogleChromeScheme[] = "googlechrome";

const char kChromeUIAppCacheInternalsHost[] = "appcache-internals";
const char kChromeUIIndexedDBInternalsHost[] = "indexeddb-internals";
const char kChromeUIBlobInternalsHost[] = "blob-internals";
const char kChromeUIBrowserCrashHost[] = "inducebrowsercrashforrealz";
const char kChromeUIDinoHost[] = "dino";
const char kChromeUIGpuHost[] = "gpu";
const char kChromeUIHistogramHost[] = "histograms";
const char kChromeUIMediaInternalsHost[] = "media-internals";
const char kChromeUIMemoryExhaustHost[] = "memory-exhaust";
const char kChromeUINetworkErrorHost[] = "network-error";
const char kChromeUINetworkErrorsListingHost[] = "network-errors";
const char kChromeUIProcessInternalsHost[] = "process-internals";
const char kChromeUIResourcesHost[] = "resources";
const char kChromeUIServiceWorkerInternalsHost[] = "serviceworker-internals";
const char kChromeUITracingHost[] = "tracing";
const char kChromeUIWebRTCInternalsHost[] = "webrtc-internals";

const char kChromeUIBadCastCrashURL[] = "chrome://badcastcrash/";
const char kChromeUICheckCrashURL[] = "chrome://checkcrash/";
const char kChromeUIBrowserCrashURL[] = "chrome://inducebrowsercrashforrealz/";
const char kChromeUIBrowserUIHang[] = "chrome://uithreadhang/";
const char kChromeUICrashURL[] = "chrome://crash/";
const char kChromeUIDelayedBrowserUIHang[] = "chrome://delayeduithreadhang/";
const char kChromeUIDumpURL[] = "chrome://crashdump/";
const char kChromeUIGpuCleanURL[] = "chrome://gpuclean/";
const char kChromeUIGpuCrashURL[] = "chrome://gpucrash/";
const char kChromeUIGpuHangURL[] = "chrome://gpuhang/";
const char kChromeUIHangURL[] = "chrome://hang/";
const char kChromeUIKillURL[] = "chrome://kill/";
const char kChromeUIMemoryExhaustURL[] = "chrome://memory-exhaust/";
const char kChromeUINetworkErrorURL[] = "chrome://network-error/";
const char kChromeUINetworkErrorsListingURL[] = "chrome://network-errors/";
const char kChromeUIPpapiFlashCrashURL[] = "chrome://ppapiflashcrash/";
const char kChromeUIPpapiFlashHangURL[] = "chrome://ppapiflashhang/";
const char kChromeUIProcessInternalsURL[] = "chrome://process-internals";
#if defined(OS_ANDROID)
const char kChromeUIGpuJavaCrashURL[] = "chrome://gpu-java-crash/";
#endif
#if defined(OS_WIN)
const char kChromeUIBrowserHeapCorruptionURL[] =
    "chrome://inducebrowserheapcorruption/";
const char kChromeUIHeapCorruptionCrashURL[] = "chrome://heapcorruptioncrash/";
#endif
#if defined(ADDRESS_SANITIZER)
const char kChromeUICrashHeapOverflowURL[] = "chrome://crash/heap-overflow";
const char kChromeUICrashHeapUnderflowURL[] = "chrome://crash/heap-underflow";
const char kChromeUICrashUseAfterFreeURL[] = "chrome://crash/use-after-free";

#if defined(OS_WIN)
const char kChromeUICrashCorruptHeapBlockURL[] =
    "chrome://crash/corrupt-heap-block";
const char kChromeUICrashCorruptHeapURL[] = "chrome://crash/corrupt-heap";
#endif  // OS_WIN
#endif  // ADDRESS_SANITIZER

#if DCHECK_IS_ON()
const char kChromeUICrashDcheckURL[] = "chrome://crash/dcheck";
#endif

// This error URL is loaded in normal web renderer processes, so it should not
// have a chrome:// scheme that might let it be confused with a WebUI page.
const char kUnreachableWebDataURL[] = "chrome-error://chromewebdata/";

const char kBlockedURL[] = "about:blank#blocked";

const char kChromeUIResourcesURL[] = "chrome://resources/";
const char kChromeUIShorthangURL[] = "chrome://shorthang/";

}  // namespace content

chrome://view-http-cache/ 支持看缓存