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// 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 "net/tools/quic/quic_in_memory_cache.h"
#include "base/file_util.h"
#include "base/files/file_enumerator.h"
#include "base/stl_util.h"
#include "base/strings/string_number_conversions.h"
#include "net/tools/balsa/balsa_headers.h"
using base::FilePath;
using base::StringPiece;
using std::string;
// Specifies the directory used during QuicInMemoryCache
// construction to seed the cache. Cache directory can be
// generated using `wget -p --save-headers <url>
namespace net {
namespace tools {
std::string FLAGS_quic_in_memory_cache_dir = "";
namespace {
// BalsaVisitor implementation (glue) which caches response bodies.
class CachingBalsaVisitor : public NoOpBalsaVisitor {
public:
CachingBalsaVisitor() : done_framing_(false) {}
virtual void ProcessBodyData(const char* input, size_t size) OVERRIDE {
AppendToBody(input, size);
}
virtual void MessageDone() OVERRIDE {
done_framing_ = true;
}
virtual void HandleHeaderError(BalsaFrame* framer) OVERRIDE {
UnhandledError();
}
virtual void HandleHeaderWarning(BalsaFrame* framer) OVERRIDE {
UnhandledError();
}
virtual void HandleChunkingError(BalsaFrame* framer) OVERRIDE {
UnhandledError();
}
virtual void HandleBodyError(BalsaFrame* framer) OVERRIDE {
UnhandledError();
}
void UnhandledError() {
LOG(DFATAL) << "Unhandled error framing HTTP.";
}
void AppendToBody(const char* input, size_t size) {
body_.append(input, size);
}
bool done_framing() const { return done_framing_; }
const string& body() const { return body_; }
private:
bool done_framing_;
string body_;
};
} // namespace
// static
QuicInMemoryCache* QuicInMemoryCache::GetInstance() {
return Singleton<QuicInMemoryCache>::get();
}
const QuicInMemoryCache::Response* QuicInMemoryCache::GetResponse(
const BalsaHeaders& request_headers) const {
ResponseMap::const_iterator it = responses_.find(GetKey(request_headers));
if (it == responses_.end()) {
return NULL;
}
return it->second;
}
void QuicInMemoryCache::AddSimpleResponse(StringPiece method,
StringPiece path,
StringPiece version,
StringPiece response_code,
StringPiece response_detail,
StringPiece body) {
BalsaHeaders request_headers, response_headers;
request_headers.SetRequestFirstlineFromStringPieces(method,
path,
version);
response_headers.SetRequestFirstlineFromStringPieces(version,
response_code,
response_detail);
response_headers.AppendHeader("content-length",
base::IntToString(body.length()));
AddResponse(request_headers, response_headers, body);
}
void QuicInMemoryCache::AddResponse(const BalsaHeaders& request_headers,
const BalsaHeaders& response_headers,
StringPiece response_body) {
VLOG(1) << "Adding response for: " << GetKey(request_headers);
if (ContainsKey(responses_, GetKey(request_headers))) {
LOG(DFATAL) << "Response for given request already exists!";
return;
}
Response* new_response = new Response();
new_response->set_headers(response_headers);
new_response->set_body(response_body);
responses_[GetKey(request_headers)] = new_response;
}
void QuicInMemoryCache::AddSpecialResponse(StringPiece method,
StringPiece path,
StringPiece version,
SpecialResponseType response_type) {
BalsaHeaders request_headers, response_headers;
request_headers.SetRequestFirstlineFromStringPieces(method,
path,
version);
AddResponse(request_headers, response_headers, "");
responses_[GetKey(request_headers)]->response_type_ = response_type;
}
QuicInMemoryCache::QuicInMemoryCache() {
Initialize();
}
void QuicInMemoryCache::ResetForTests() {
STLDeleteValues(&responses_);
Initialize();
}
void QuicInMemoryCache::Initialize() {
// If there's no defined cache dir, we have no initialization to do.
if (FLAGS_quic_in_memory_cache_dir.empty()) {
VLOG(1) << "No cache directory found. Skipping initialization.";
return;
}
VLOG(1) << "Attempting to initialize QuicInMemoryCache from directory: "
<< FLAGS_quic_in_memory_cache_dir;
FilePath directory(FLAGS_quic_in_memory_cache_dir);
base::FileEnumerator file_list(directory,
true,
base::FileEnumerator::FILES);
FilePath file = file_list.Next();
while (!file.empty()) {
// Need to skip files in .svn directories
if (file.value().find("/.svn/") != std::string::npos) {
file = file_list.Next();
continue;
}
BalsaHeaders request_headers, response_headers;
string file_contents;
base::ReadFileToString(file, &file_contents);
// Frame HTTP.
CachingBalsaVisitor caching_visitor;
BalsaFrame framer;
framer.set_balsa_headers(&response_headers);
framer.set_balsa_visitor(&caching_visitor);
size_t processed = 0;
while (processed < file_contents.length() &&
!caching_visitor.done_framing()) {
processed += framer.ProcessInput(file_contents.c_str() + processed,
file_contents.length() - processed);
}
string response_headers_str;
response_headers.DumpToString(&response_headers_str);
if (!caching_visitor.done_framing()) {
LOG(DFATAL) << "Did not frame entire message from file: " << file.value()
<< " (" << processed << " of " << file_contents.length()
<< " bytes).";
}
if (processed < file_contents.length()) {
// Didn't frame whole file. Assume remainder is body.
// This sometimes happens as a result of incompatibilities between
// BalsaFramer and wget's serialization of HTTP sans content-length.
caching_visitor.AppendToBody(file_contents.c_str() + processed,
file_contents.length() - processed);
processed += file_contents.length();
}
StringPiece base = file.value();
if (response_headers.HasHeader("X-Original-Url")) {
base = response_headers.GetHeader("X-Original-Url");
response_headers.RemoveAllOfHeader("X-Original-Url");
// Remove the protocol so that the string is of the form host + path,
// which is parsed properly below.
if (StringPieceUtils::StartsWithIgnoreCase(base, "https://")) {
base.remove_prefix(8);
} else if (StringPieceUtils::StartsWithIgnoreCase(base, "http://")) {
base.remove_prefix(7);
}
}
int path_start = base.find_first_of('/');
DCHECK_LT(0, path_start);
StringPiece host(base.substr(0, path_start));
StringPiece path(base.substr(path_start));
if (path[path.length() - 1] == ',') {
path.remove_suffix(1);
}
// Set up request headers. Assume method is GET and protocol is HTTP/1.1.
request_headers.SetRequestFirstlineFromStringPieces("GET",
path,
"HTTP/1.1");
request_headers.ReplaceOrAppendHeader("host", host);
VLOG(1) << "Inserting 'http://" << GetKey(request_headers)
<< "' into QuicInMemoryCache.";
AddResponse(request_headers, response_headers, caching_visitor.body());
file = file_list.Next();
}
}
QuicInMemoryCache::~QuicInMemoryCache() {
STLDeleteValues(&responses_);
}
string QuicInMemoryCache::GetKey(const BalsaHeaders& request_headers) const {
StringPiece uri = request_headers.request_uri();
if (uri.size() == 0) {
return "";
}
StringPiece host;
if (uri[0] == '/') {
host = request_headers.GetHeader("host");
} else if (StringPieceUtils::StartsWithIgnoreCase(uri, "https://")) {
uri.remove_prefix(8);
} else if (StringPieceUtils::StartsWithIgnoreCase(uri, "http://")) {
uri.remove_prefix(7);
}
return host.as_string() + uri.as_string();
}
} // namespace tools
} // namespace net
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