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SingularityViewer/indra/llmessage/llavatarnamecache.cpp

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/**
* @file llavatarnamecache.cpp
* @brief Provides lookup of avatar SLIDs ("bobsmith123") and display names
* ("James Cook") from avatar UUIDs.
*
* $LicenseInfo:firstyear=2010&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "llavatarnamecache.h"
#include "llcachename.h" // we wrap this system
#include "llcontrol.h" // For LLCachedControl
#include "llframetimer.h"
#include "llhttpclient.h"
#include "llsd.h"
#include "llsdserialize.h"
#include <boost/tokenizer.hpp>
#include <map>
#include <set>
namespace LLAvatarNameCache
{
use_display_name_signal_t mUseDisplayNamesSignal;
// [RLVa:KB] - Checked: 2010-12-08 (RLVa-1.4.0a) | Added: RLVa-1.2.2c
// RLVa override for display names
bool sForceDisplayNames = false;
// [/RLVa:KB]
// Cache starts in a paused state until we can determine if the
// current region supports display names.
bool sRunning = false;
// Use the People API (modern) for fetching name if true. Use the old legacy protocol if false.
// For testing, there's a UsePeopleAPI setting that can be flipped (must restart viewer).
bool sUsePeopleAPI = true;
// Base lookup URL for name service.
// On simulator, loaded from indra.xml
// On viewer, usually a simulator capability (at People API team's request)
// Includes the trailing slash, like "http://pdp60.lindenlab.com:8000/agents/"
std::string sNameLookupURL;
// Accumulated agent IDs for next query against service
typedef uuid_set_t ask_queue_t;
ask_queue_t sAskQueue;
// Agent IDs that have been requested, but with no reply.
// Maps agent ID to frame time request was made.
typedef std::map<LLUUID, F64> pending_queue_t;
pending_queue_t sPendingQueue;
// Callbacks to fire when we received a name.
// May have multiple callbacks for a single ID, which are
// represented as multiple slots bound to the signal.
// Avoid copying signals via pointers.
typedef std::map<LLUUID, callback_signal_t*> signal_map_t;
signal_map_t sSignalMap;
// The cache at last, i.e. avatar names we know about.
typedef std::map<LLUUID, LLAvatarName> cache_t;
cache_t sCache;
// Send bulk lookup requests a few times a second at most.
// Only need per-frame timing resolution.
LLFrameTimer sRequestTimer;
// Maximum time an unrefreshed cache entry is allowed.
const F64 MAX_UNREFRESHED_TIME = 20.0 * 60.0;
// Time when unrefreshed cached names were checked last.
static F64 sLastExpireCheck;
// Time-to-live for a temp cache entry.
const F64 TEMP_CACHE_ENTRY_LIFETIME = 60.0;
//-----------------------------------------------------------------------
// Internal methods
//-----------------------------------------------------------------------
// Handle name response off network.
void processName(const LLUUID& agent_id,
const LLAvatarName& av_name);
void requestNamesViaCapability();
// Legacy name system callbacks
void legacyNameCallback(const LLUUID& agent_id,
const std::string& full_name,
bool is_group);
void legacyNameFetch(const LLUUID& agent_id,
const std::string& full_name,
bool is_group);
void requestNamesViaLegacy();
// Do a single callback to a given slot
void fireSignal(const LLUUID& agent_id,
const callback_slot_t& slot,
const LLAvatarName& av_name);
// Is a request in-flight over the network?
bool isRequestPending(const LLUUID& agent_id);
// Erase expired names from cache
void eraseUnrefreshed();
bool expirationFromCacheControl(AIHTTPReceivedHeaders const& headers, F64* expires);
}
/* Sample response:
<?xml version="1.0"?>
<llsd>
<map>
<key>agents</key>
<array>
<map>
<key>display_name_next_update</key>
<date>2010-04-16T21:34:02+00:00Z</date>
<key>display_name_expires</key>
<date>2010-04-16T21:32:26.142178+00:00Z</date>
<key>display_name</key>
<string>MickBot390 LLQABot</string>
<key>sl_id</key>
<string>mickbot390.llqabot</string>
<key>id</key>
<string>0012809d-7d2d-4c24-9609-af1230a37715</string>
<key>is_display_name_default</key>
<boolean>false</boolean>
</map>
<map>
<key>display_name_next_update</key>
<date>2010-04-16T21:34:02+00:00Z</date>
<key>display_name_expires</key>
<date>2010-04-16T21:32:26.142178+00:00Z</date>
<key>display_name</key>
<string>Bjork Gudmundsdottir</string>
<key>sl_id</key>
<string>sardonyx.linden</string>
<key>id</key>
<string>3941037e-78ab-45f0-b421-bd6e77c1804d</string>
<key>is_display_name_default</key>
<boolean>true</boolean>
</map>
</array>
</map>
</llsd>
*/
class LLAvatarNameResponder : public LLHTTPClient::ResponderWithResult
{
LOG_CLASS(LLAvatarNameResponder);
private:
// need to store agent ids that are part of this request in case of
// an error, so we can flag them as unavailable
uuid_vec_t mAgentIDs;
// Need the headers to look up Expires: and Retry-After:
/*virtual*/ bool needsHeaders() const { return true; }
/*virtual*/ char const* getName() const { return "LLAvatarNameResponder"; }
public:
LLAvatarNameResponder(const uuid_vec_t& agent_ids)
: mAgentIDs(agent_ids)
{ }
protected:
/*virtual*/ void httpSuccess()
{
const LLSD& content = getContent();
if (!content.isMap())
{
failureResult(HTTP_INTERNAL_ERROR_OTHER, "Malformed response contents", content);
return;
}
// Pull expiration out of headers if available
F64 expires = LLAvatarNameCache::nameExpirationFromHeaders(getResponseHeaders());
F64 now = LLFrameTimer::getTotalSeconds();
const LLSD& agents = content["agents"];
LLSD::array_const_iterator it = agents.beginArray();
for ( ; it != agents.endArray(); ++it)
{
const LLSD& row = *it;
LLUUID agent_id = row["id"].asUUID();
LLAvatarName av_name;
av_name.fromLLSD(row);
// Use expiration time from header
av_name.mExpires = expires;
LL_DEBUGS("AvNameCache") << "LLAvatarNameResponder::result for " << agent_id << LL_ENDL;
av_name.dump();
// cache it and fire signals
LLAvatarNameCache::processName(agent_id, av_name);
}
// Same logic as error response case
const LLSD& unresolved_agents = content["bad_ids"];
S32 num_unresolved = unresolved_agents.size();
if (num_unresolved > 0)
{
LL_WARNS("AvNameCache") << "LLAvatarNameResponder::result " << num_unresolved << " unresolved ids; "
<< "expires in " << expires - now << " seconds"
<< LL_ENDL;
it = unresolved_agents.beginArray();
for ( ; it != unresolved_agents.endArray(); ++it)
{
const LLUUID& agent_id = *it;
LL_WARNS("AvNameCache") << "LLAvatarNameResponder::result "
<< "failed id " << agent_id
<< LL_ENDL;
LLAvatarNameCache::handleAgentError(agent_id);
}
}
LL_DEBUGS("AvNameCache") << "LLAvatarNameResponder::result "
<< LLAvatarNameCache::sCache.size() << " cached names"
<< LL_ENDL;
}
/*virtual*/ void httpFailure()
{
// If there's an error, it might be caused by PeopleApi,
// or when loading textures on startup and using a very slow
// network, this query may time out.
// What we should do depends on whether or not we have a cached name
LL_WARNS("AvNameCache") << dumpResponse() << LL_ENDL;
// Add dummy records for any agent IDs in this request that we do not have cached already
auto it = mAgentIDs.begin();
for ( ; it != mAgentIDs.end(); ++it)
{
const LLUUID& agent_id = *it;
LLAvatarNameCache::handleAgentError(agent_id);
}
}
};
// Provide some fallback for agents that return errors
void LLAvatarNameCache::handleAgentError(const LLUUID& agent_id)
{
std::map<LLUUID,LLAvatarName>::iterator existing = sCache.find(agent_id);
if (existing == sCache.end())
{
// there is no existing cache entry, so make a temporary name from legacy
LL_WARNS("AvNameCache") << "LLAvatarNameCache get legacy for agent "
<< agent_id << LL_ENDL;
gCacheName->get(agent_id, false, // legacy compatibility
boost::bind(&LLAvatarNameCache::legacyNameFetch, _1, _2, _3));
}
else
{
// we have a cached (but probably expired) entry - since that would have
// been returned by the get method, there is no need to signal anyone
// Clear this agent from the pending list
LLAvatarNameCache::sPendingQueue.erase(agent_id);
LLAvatarName& av_name = existing->second;
LL_DEBUGS("AvNameCache") << "LLAvatarNameCache use cache for agent " << agent_id << LL_ENDL;
av_name.dump();
// Reset expiry time so we don't constantly rerequest.
av_name.setExpires(TEMP_CACHE_ENTRY_LIFETIME);
}
}
void LLAvatarNameCache::processName(const LLUUID& agent_id, const LLAvatarName& av_name)
{
// Add to the cache
sCache[agent_id] = av_name;
// Suppress request from the queue
sPendingQueue.erase(agent_id);
// Signal everyone waiting on this name
signal_map_t::iterator sig_it = sSignalMap.find(agent_id);
if (sig_it != sSignalMap.end())
{
callback_signal_t* signal = sig_it->second;
(*signal)(agent_id, av_name);
sSignalMap.erase(agent_id);
delete signal;
signal = NULL;
}
}
void LLAvatarNameCache::requestNamesViaCapability()
{
F64 now = LLFrameTimer::getTotalSeconds();
// URL format is like:
// http://pdp60.lindenlab.com:8000/agents/?ids=3941037e-78ab-45f0-b421-bd6e77c1804d&ids=0012809d-7d2d-4c24-9609-af1230a37715&ids=0019aaba-24af-4f0a-aa72-6457953cf7f0
//
// Apache can handle URLs of 4096 chars, but let's be conservative
static const U32 NAME_URL_MAX = 4096;
static const U32 NAME_URL_SEND_THRESHOLD = 3500;
std::string url;
url.reserve(NAME_URL_MAX);
uuid_vec_t agent_ids;
agent_ids.reserve(128);
U32 ids = 0;
ask_queue_t::const_iterator it;
while(!sAskQueue.empty())
{
it = sAskQueue.begin();
const LLUUID agent_id = *it;
sAskQueue.erase(it);
if (url.empty())
{
// ...starting new request
url += sNameLookupURL;
url += "?ids=";
ids = 1;
}
else
{
// ...continuing existing request
url += "&ids=";
ids++;
}
url += agent_id.asString();
agent_ids.push_back(agent_id);
// mark request as pending
sPendingQueue[agent_id] = now;
if (url.size() > NAME_URL_SEND_THRESHOLD)
{
break;
}
}
if (!url.empty())
{
LL_INFOS("AvNameCache") << "LLAvatarNameCache::requestNamesViaCapability getting " << ids << " ids" << LL_ENDL;
LLHTTPClient::get(url, new LLAvatarNameResponder(agent_ids));
}
}
void LLAvatarNameCache::legacyNameCallback(const LLUUID& agent_id,
const std::string& full_name,
bool is_group)
{
// Put the received data in the cache
legacyNameFetch(agent_id, full_name, is_group);
// Retrieve the name and set it to never (or almost never...) expire: when we are using the legacy
// protocol, we do not get an expiration date for each name and there's no reason to ask the
// data again and again so we set the expiration time to the largest value admissible.
std::map<LLUUID,LLAvatarName>::iterator av_record = sCache.find(agent_id);
LLAvatarName& av_name = av_record->second;
av_name.setExpires(MAX_UNREFRESHED_TIME);
}
void LLAvatarNameCache::legacyNameFetch(const LLUUID& agent_id,
const std::string& full_name,
bool is_group)
{
LL_DEBUGS("AvNameCache") << "LLAvatarNameCache agent " << agent_id << " "
<< "full name '" << full_name << "'"
<< ( is_group ? " [group]" : "" )
<< LL_ENDL;
// Construct an av_name record from this name.
LLAvatarName av_name;
av_name.fromString(full_name);
// Add to cache: we're still using the new cache even if we're using the old (legacy) protocol.
processName(agent_id, av_name);
}
void LLAvatarNameCache::requestNamesViaLegacy()
{
static const S32 MAX_REQUESTS = 100;
F64 now = LLFrameTimer::getTotalSeconds();
std::string full_name;
ask_queue_t::const_iterator it;
for (S32 requests = 0; !sAskQueue.empty() && requests < MAX_REQUESTS; ++requests)
{
it = sAskQueue.begin();
const LLUUID& agent_id = *it;
sAskQueue.erase(it);
// Mark as pending first, just in case the callback is immediately
// invoked below. This should never happen in practice.
sPendingQueue[agent_id] = now;
LL_DEBUGS("AvNameCache") << "LLAvatarNameCache::requestNamesViaLegacy agent " << agent_id << LL_ENDL;
gCacheName->get(agent_id, false, // legacy compatibility
boost::bind(&LLAvatarNameCache::legacyNameCallback, _1, _2, _3));
}
}
void LLAvatarNameCache::initClass(bool running, bool usePeopleAPI)
{
sRunning = running;
sUsePeopleAPI = usePeopleAPI;
}
void LLAvatarNameCache::cleanupClass()
{
sCache.clear();
}
bool LLAvatarNameCache::importFile(std::istream& istr)
{
LLSD data;
if (LLSDParser::PARSE_FAILURE == LLSDSerialize::fromXMLDocument(data, istr))
{
LL_WARNS("AvNameCache") << "avatar name cache data xml parse failed" << LL_ENDL;
return false;
}
// by convention LLSD storage is a map
// we only store one entry in the map
LLSD agents = data["agents"];
LLUUID agent_id;
LLAvatarName av_name;
LLSD::map_const_iterator it = agents.beginMap();
for ( ; it != agents.endMap(); ++it)
{
agent_id.set(it->first);
av_name.fromLLSD( it->second );
sCache[agent_id] = av_name;
}
LL_INFOS("AvNameCache") << "LLAvatarNameCache loaded " << sCache.size() << LL_ENDL;
// Some entries may have expired since the cache was stored,
// but they will be flushed in the first call to eraseUnrefreshed
// from LLAvatarNameResponder::idle
return true;
}
void LLAvatarNameCache::exportFile(std::ostream& ostr)
{
LLSD agents;
F64 max_unrefreshed = LLFrameTimer::getTotalSeconds() - MAX_UNREFRESHED_TIME;
LL_INFOS("AvNameCache") << "LLAvatarNameCache at exit cache has " << sCache.size() << LL_ENDL;
cache_t::const_iterator it = sCache.begin();
for ( ; it != sCache.end(); ++it)
{
const LLUUID& agent_id = it->first;
const LLAvatarName& av_name = it->second;
// Do not write temporary or expired entries to the stored cache
if (av_name.isValidName(max_unrefreshed))
{
// key must be a string
agents[agent_id.asString()] = av_name.asLLSD();
}
}
LL_INFOS("AvNameCache") << "LLAvatarNameCache returning " << agents.size() << LL_ENDL;
LLSD data;
data["agents"] = agents;
LLSDSerialize::toPrettyXML(data, ostr);
}
void LLAvatarNameCache::setNameLookupURL(const std::string& name_lookup_url)
{
sNameLookupURL = name_lookup_url;
}
bool LLAvatarNameCache::hasNameLookupURL()
{
return !sNameLookupURL.empty();
}
bool LLAvatarNameCache::usePeopleAPI()
{
return hasNameLookupURL() && sUsePeopleAPI;
}
void LLAvatarNameCache::idle()
{
// By convention, start running at first idle() call
sRunning = true;
// *TODO: Possibly re-enabled this based on People API load measurements
// 100 ms is the threshold for "user speed" operations, so we can
// stall for about that long to batch up requests.
const F32 SECS_BETWEEN_REQUESTS = 0.1f;
if (!sRequestTimer.hasExpired())
{
return;
}
if (!sAskQueue.empty())
{
if (usePeopleAPI())
{
requestNamesViaCapability();
}
else
{
LL_WARNS_ONCE("AvNameCache") << "LLAvatarNameCache still using legacy api" << LL_ENDL;
requestNamesViaLegacy();
}
}
if (sAskQueue.empty())
{
// cleared the list, reset the request timer.
sRequestTimer.resetWithExpiry(SECS_BETWEEN_REQUESTS);
}
// erase anything that has not been refreshed for more than MAX_UNREFRESHED_TIME
eraseUnrefreshed();
}
bool LLAvatarNameCache::isRequestPending(const LLUUID& agent_id)
{
bool isPending = false;
const F64 PENDING_TIMEOUT_SECS = 5.0 * 60.0;
pending_queue_t::const_iterator it = sPendingQueue.find(agent_id);
if (it != sPendingQueue.end())
{
// in the list of requests in flight, retry if too old
F64 expire_time = LLFrameTimer::getTotalSeconds() - PENDING_TIMEOUT_SECS;
isPending = (it->second > expire_time);
}
return isPending;
}
void LLAvatarNameCache::eraseUnrefreshed()
{
F64 now = LLFrameTimer::getTotalSeconds();
F64 max_unrefreshed = now - MAX_UNREFRESHED_TIME;
if (!sLastExpireCheck || sLastExpireCheck < max_unrefreshed)
{
sLastExpireCheck = now;
S32 expired = 0;
for (cache_t::iterator it = sCache.begin(); it != sCache.end();)
{
const LLAvatarName& av_name = it->second;
if (av_name.mExpires < max_unrefreshed)
{
LL_DEBUGS("AvNameCacheExpired") << "LLAvatarNameCache " << it->first
<< " user '" << av_name.getAccountName() << "' "
<< "expired " << now - av_name.mExpires << " secs ago"
<< LL_ENDL;
sCache.erase(it++);
expired++;
}
else
{
++it;
}
}
LL_INFOS("AvNameCache") << "LLAvatarNameCache expired " << expired << " cached avatar names, "
<< sCache.size() << " remaining" << LL_ENDL;
}
}
// fills in av_name if it has it in the cache, even if expired (can check expiry time)
// returns bool specifying if av_name was filled, false otherwise
bool LLAvatarNameCache::get(const LLUUID& agent_id, LLAvatarName *av_name)
{
if (sRunning)
{
// ...only do immediate lookups when cache is running
std::map<LLUUID,LLAvatarName>::iterator it = sCache.find(agent_id);
if (it != sCache.end())
{
*av_name = it->second;
// re-request name if entry is expired
if (av_name->mExpires < LLFrameTimer::getTotalSeconds())
{
if (!isRequestPending(agent_id))
{
LL_DEBUGS("AvNameCache") << "LLAvatarNameCache refresh agent " << agent_id
<< LL_ENDL;
sAskQueue.insert(agent_id);
}
}
return true;
}
else if (!usePeopleAPI())
{
std::string full_name;
if (gCacheName->getFullName(agent_id, full_name))
{
av_name->fromString(full_name);
sCache[agent_id] = *av_name;
return true;
}
}
}
if (!isRequestPending(agent_id))
{
LL_DEBUGS("AvNameCache") << "LLAvatarNameCache queue request for agent " << agent_id << LL_ENDL;
sAskQueue.insert(agent_id);
}
return false;
}
const S32& main_name_system()
{
static const LLCachedControl<S32> name_system("PhoenixNameSystem", 0);
return name_system;
}
// Return true when name has been set to Name System Name, if not return false.
bool LLAvatarNameCache::getNSName(const LLUUID& agent_id, std::string& name, const S32& name_system)
{
LLAvatarName avatar_name;
if (get(agent_id, &avatar_name))
name = avatar_name.getNSName(name_system);
else return false;
return true;
}
void LLAvatarNameCache::fireSignal(const LLUUID& agent_id,
const callback_slot_t& slot,
const LLAvatarName& av_name)
{
callback_signal_t signal;
signal.connect(slot);
signal(agent_id, av_name);
}
LLAvatarNameCache::callback_connection_t LLAvatarNameCache::get(const LLUUID& agent_id, callback_slot_t slot)
{
callback_connection_t connection;
if (sRunning)
{
// ...only do immediate lookups when cache is running
std::map<LLUUID,LLAvatarName>::iterator it = sCache.find(agent_id);
if (it != sCache.end())
{
const LLAvatarName& av_name = it->second;
if (av_name.mExpires > LLFrameTimer::getTotalSeconds())
{
// ...name already exists in cache, fire callback now
fireSignal(agent_id, slot, av_name);
return connection;
}
}
}
// schedule a request
if (!isRequestPending(agent_id))
{
sAskQueue.insert(agent_id);
}
// always store additional callback, even if request is pending
signal_map_t::iterator sig_it = sSignalMap.find(agent_id);
if (sig_it == sSignalMap.end())
{
// ...new callback for this id
callback_signal_t* signal = new callback_signal_t();
connection = signal->connect(slot);
sSignalMap[agent_id] = signal;
}
else
{
// ...existing callback, bind additional slot
callback_signal_t* signal = sig_it->second;
connection = signal->connect(slot);
}
return connection;
}
// [RLVa:KB] - Checked: 2010-12-08 (RLVa-1.4.0a) | Added: RLVa-1.2.2c
bool LLAvatarNameCache::getForceDisplayNames()
{
return sForceDisplayNames;
}
void LLAvatarNameCache::setForceDisplayNames(bool force)
{
sForceDisplayNames = force;
if ( (!LLAvatarName::useDisplayNames()) && (force) )
{
setUseDisplayNames(true);
}
}
// [/RLVa:KB]
void LLAvatarNameCache::setUseDisplayNames(bool use)
{
// [RLVa:KB] - Checked: 2010-12-08 (RLVa-1.4.0a) | Added: RLVa-1.2.2c
// We need to force the use of the "display names" cache when @shownames=n restricted (and disallow toggling it)
use |= getForceDisplayNames();
// [/RLVa:KB]
if (use != LLAvatarName::useDisplayNames())
{
LLAvatarName::setUseDisplayNames(use);
mUseDisplayNamesSignal();
}
}
void LLAvatarNameCache::setUseUsernames(bool use)
{
if (use != LLAvatarName::useUsernames())
{
LLAvatarName::setUseUsernames(use);
mUseDisplayNamesSignal();
}
}
void LLAvatarNameCache::erase(const LLUUID& agent_id)
{
sCache.erase(agent_id);
}
void LLAvatarNameCache::insert(const LLUUID& agent_id, const LLAvatarName& av_name)
{
// *TODO: update timestamp if zero?
sCache[agent_id] = av_name;
}
F64 LLAvatarNameCache::nameExpirationFromHeaders(AIHTTPReceivedHeaders const& headers)
{
F64 expires = 0.0;
if (expirationFromCacheControl(headers, &expires))
{
return expires;
}
else
{
// With no expiration info, default to an hour
const F64 DEFAULT_EXPIRES = 60.0 * 60.0;
F64 now = LLFrameTimer::getTotalSeconds();
return now + DEFAULT_EXPIRES;
}
}
bool LLAvatarNameCache::expirationFromCacheControl(AIHTTPReceivedHeaders const& headers, F64* expires)
{
bool fromCacheControl = false;
F64 now = LLFrameTimer::getTotalSeconds();
// Allow the header to override the default
std::string cache_control;
if (headers.getFirstValue("cache-control", cache_control))
{
S32 max_age = 0;
if (max_age_from_cache_control(cache_control, &max_age))
{
*expires = now + (F64)max_age;
fromCacheControl = true;
}
}
LL_DEBUGS("AvNameCache") << "LLAvatarNameCache "
<< ( fromCacheControl ? "expires based on cache control " : "default expiration " )
<< "in " << *expires - now << " seconds"
<< LL_ENDL;
return fromCacheControl;
}
void LLAvatarNameCache::addUseDisplayNamesCallback(const use_display_name_signal_t::slot_type& cb)
{
mUseDisplayNamesSignal.connect(cb);
}
static const std::string MAX_AGE("max-age");
static const boost::char_separator<char> EQUALS_SEPARATOR("=");
static const boost::char_separator<char> COMMA_SEPARATOR(",");
bool max_age_from_cache_control(const std::string& cache_control, S32 *max_age)
{
// Split the string on "," to get a list of directives
typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
tokenizer directives(cache_control, COMMA_SEPARATOR);
tokenizer::iterator token_it = directives.begin();
for ( ; token_it != directives.end(); ++token_it)
{
// Tokens may have leading or trailing whitespace
std::string token = *token_it;
LLStringUtil::trim(token);
if (token.compare(0, MAX_AGE.size(), MAX_AGE) == 0)
{
// ...this token starts with max-age, so let's chop it up by "="
tokenizer subtokens(token, EQUALS_SEPARATOR);
tokenizer::iterator subtoken_it = subtokens.begin();
// Must have a token
if (subtoken_it == subtokens.end()) return false;
std::string subtoken = *subtoken_it;
// Must exactly equal "max-age"
LLStringUtil::trim(subtoken);
if (subtoken != MAX_AGE) return false;
// Must have another token
++subtoken_it;
if (subtoken_it == subtokens.end()) return false;
subtoken = *subtoken_it;
// Must be a valid integer
// *NOTE: atoi() returns 0 for invalid values, so we have to
// check the string first.
// *TODO: Do servers ever send "0000" for zero? We don't handle it
LLStringUtil::trim(subtoken);
if (subtoken == "0")
{
*max_age = 0;
return true;
}
S32 val = atoi( subtoken.c_str() );
if (val > 0 && val < S32_MAX)
{
*max_age = val;
return true;
}
return false;
}
}
return false;
}
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