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SingularityViewer/indra/llmessage/llexperiencecache.cpp
Liru Færs b08b597397 Merge branch 'master' of git://github.com/Shyotl/SingularityViewer 
# Conflicts:
#	indra/llcommon/llsd.cpp
#	indra/llcommon/llsdserialize.cpp
#	indra/newview/llspeakers.cpp
#	indra/newview/llviewermessage.cpp
2020-02-25 06:51:41 -05:00

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27 KiB
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/**
* @file llexperiencecache.cpp
* @brief llexperiencecache and related class definitions
*
* $LicenseInfo:firstyear=2012&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2012, 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 "llexperiencecache.h"
#include "llavatarname.h"
#include "llcororesponder.h"
#include "llsdserialize.h"
#include "lleventfilter.h"
#include "lldir.h"
#include <set>
#include <map>
#include <boost/tokenizer.hpp>
#include <boost/concept_check.hpp>
#include <boost/smart_ptr/make_shared.hpp>
//=========================================================================
namespace LLExperienceCacheImpl
{
void mapKeys(const LLSD& legacyKeys);
F64 getErrorRetryDeltaTime(S32 status, const AIHTTPReceivedHeaders& headers);
bool maxAgeFromCacheControl(const std::string& cache_control, S32 *max_age);
static const std::string PRIVATE_KEY = "private_id";
static const std::string EXPERIENCE_ID = "public_id";
static const std::string MAX_AGE("max-age");
static const boost::char_separator<char> EQUALS_SEPARATOR("=");
static const boost::char_separator<char> COMMA_SEPARATOR(",");
// *TODO$: this seems to be tied to mapKeys which is used by bootstrap.... but I don't think that bootstrap is used.
typedef std::map<LLUUID, LLUUID> KeyMap;
KeyMap privateToPublicKeyMap;
}
//=========================================================================
const std::string LLExperienceCache::PRIVATE_KEY = "private_id";
const std::string LLExperienceCache::MISSING = "DoesNotExist";
const std::string LLExperienceCache::AGENT_ID = "agent_id";
const std::string LLExperienceCache::GROUP_ID = "group_id";
const std::string LLExperienceCache::EXPERIENCE_ID = "public_id";
const std::string LLExperienceCache::NAME = "name";
const std::string LLExperienceCache::PROPERTIES = "properties";
const std::string LLExperienceCache::EXPIRES = "expiration";
const std::string LLExperienceCache::DESCRIPTION = "description";
const std::string LLExperienceCache::QUOTA = "quota";
const std::string LLExperienceCache::MATURITY = "maturity";
const std::string LLExperienceCache::METADATA = "extended_metadata";
const std::string LLExperienceCache::SLURL = "slurl";
// should be in sync with experience-api/experiences/models.py
const int LLExperienceCache::PROPERTY_INVALID = 1 << 0;
const int LLExperienceCache::PROPERTY_PRIVILEGED = 1 << 3;
const int LLExperienceCache::PROPERTY_GRID = 1 << 4;
const int LLExperienceCache::PROPERTY_PRIVATE = 1 << 5;
const int LLExperienceCache::PROPERTY_DISABLED = 1 << 6;
const int LLExperienceCache::PROPERTY_SUSPENDED = 1 << 7;
// default values
const F64 LLExperienceCache::DEFAULT_EXPIRATION = 600.0;
const S32 LLExperienceCache::DEFAULT_QUOTA = 128; // this is megabytes
const int LLExperienceCache::SEARCH_PAGE_SIZE = 30;
//=========================================================================
LLExperienceCache::LLExperienceCache():
mShutdown(false)
{
}
LLExperienceCache::~LLExperienceCache()
{
}
void LLExperienceCache::initSingleton()
{
mCacheFileName = gDirUtilp->getExpandedFilename(LL_PATH_CACHE, "experience_cache.xml");
LL_INFOS("ExperienceCache") << "Loading " << mCacheFileName << LL_ENDL;
llifstream cache_stream(mCacheFileName.c_str());
if (cache_stream.is_open())
{
cache_stream >> (*this);
}
}
void LLExperienceCache::cleanup()
{
LL_INFOS("ExperienceCache") << "Saving " << mCacheFileName << LL_ENDL;
llofstream cache_stream(mCacheFileName.c_str());
if (cache_stream.is_open())
{
cache_stream << (*this);
}
mShutdown = true;
}
//-------------------------------------------------------------------------
void LLExperienceCache::importFile(std::istream& istr)
{
LLSD data;
S32 parse_count = LLSDSerialize::fromXMLDocument(data, istr);
if (parse_count < 1) return;
LLSD experiences = data["experiences"];
LLUUID public_key;
for (const auto& it : experiences.map())
{
public_key.set(it.first);
mCache[public_key] = it.second;
}
LL_DEBUGS("ExperienceCache") << "importFile() loaded " << mCache.size() << LL_ENDL;
}
void LLExperienceCache::exportFile(std::ostream& ostr) const
{
LLSD experiences;
cache_t::const_iterator it = mCache.begin();
for (; it != mCache.end(); ++it)
{
if (!it->second.has(EXPERIENCE_ID) || it->second[EXPERIENCE_ID].asUUID().isNull() ||
it->second.has("DoesNotExist") || (it->second.has(PROPERTIES) && it->second[PROPERTIES].asInteger() & PROPERTY_INVALID))
continue;
experiences[it->first.asString()] = it->second;
}
LLSD data;
data["experiences"] = experiences;
LLSDSerialize::toPrettyXML(data, ostr);
}
// *TODO$: Rider: This method does not seem to be used... it may be useful in testing.
void LLExperienceCache::bootstrap(const LLSD& legacyKeys, int initialExpiration)
{
LLExperienceCacheImpl::mapKeys(legacyKeys);
for (auto experience : legacyKeys.array())
{
if (experience.has(EXPERIENCE_ID))
{
if (!experience.has(EXPIRES))
{
experience[EXPIRES] = initialExpiration;
}
processExperience(experience[EXPERIENCE_ID].asUUID(), experience);
}
else
{
LL_WARNS("ExperienceCache")
<< "Skipping bootstrap entry which is missing " << EXPERIENCE_ID
<< LL_ENDL;
}
}
}
LLUUID LLExperienceCache::getExperienceId(const LLUUID& private_key, bool null_if_not_found)
{
if (private_key.isNull())
return LLUUID::null;
LLExperienceCacheImpl::KeyMap::const_iterator it = LLExperienceCacheImpl::privateToPublicKeyMap.find(private_key);
if (it == LLExperienceCacheImpl::privateToPublicKeyMap.end())
{
if (null_if_not_found)
{
return LLUUID::null;
}
return private_key;
}
LL_WARNS("LLExperience") << "converted private key " << private_key << " to experience_id " << it->second << LL_ENDL;
return it->second;
}
//=========================================================================
void LLExperienceCache::processExperience(const LLUUID& public_key, const LLSD& experience)
{
LL_INFOS("ExperienceCache") << "Processing experience \"" << experience[NAME] << "\" with key " << public_key.asString() << LL_ENDL;
mCache[public_key]=experience;
LLSD & row = mCache[public_key];
if(row.has(EXPIRES))
{
row[EXPIRES] = row[EXPIRES].asReal() + LLFrameTimer::getTotalSeconds();
}
if(row.has(EXPERIENCE_ID))
{
mPendingQueue.erase(row[EXPERIENCE_ID].asUUID());
}
//signal
signal_map_t::iterator sig_it = mSignalMap.find(public_key);
if (sig_it != mSignalMap.end())
{
signal_ptr signal = sig_it->second;
(*signal)(experience);
mSignalMap.erase(public_key);
}
}
const LLExperienceCache::cache_t& LLExperienceCache::getCached()
{
return mCache;
}
void LLExperienceCache::requestExperiencesCoro(const LLCoroResponder& responder, RequestQueue_t requests)
{
//LL_INFOS("requestExperiencesCoro") << "url: " << url << LL_ENDL;
LLSD result = responder.getContent();
auto status = responder.getStatus();
if (!responder.isGoodStatus(status))
{
F64 now = LLFrameTimer::getTotalSeconds();
auto headers = responder.getHeaders();
// build dummy entries for the failed requests
for (auto request : requests)
{
LLSD exp = get(request);
//leave the properties alone if we already have a cache entry for this xp
if (exp.isUndefined())
{
exp[PROPERTIES] = PROPERTY_INVALID;
}
exp[EXPIRES] = now + LLExperienceCacheImpl::getErrorRetryDeltaTime(status, headers);
exp[EXPERIENCE_ID] = request;
exp["key_type"] = EXPERIENCE_ID;
exp["uuid"] = request;
exp["error"] = status;
exp[QUOTA] = DEFAULT_QUOTA;
processExperience(request, exp);
}
return;
}
LLSD experiences = result["experience_keys"];
for (const auto& row : experiences.array())
{
LLUUID public_key = row[EXPERIENCE_ID].asUUID();
LL_DEBUGS("ExperienceCache") << "Received result for " << public_key
<< " display '" << row[LLExperienceCache::NAME].asString() << "'" << LL_ENDL;
processExperience(public_key, row);
}
LLSD error_ids = result["error_ids"];
for (const auto& err : error_ids.array())
{
LLUUID id = err.asUUID();
LLSD exp;
exp[EXPIRES] = DEFAULT_EXPIRATION;
exp[EXPERIENCE_ID] = id;
exp[PROPERTIES] = PROPERTY_INVALID;
exp[MISSING] = true;
exp[QUOTA] = DEFAULT_QUOTA;
processExperience(id, exp);
LL_WARNS("ExperienceCache") << "LLExperienceResponder::result() error result for " << id << LL_ENDL;
}
}
void LLExperienceCache::requestExperiences()
{
if (mCapability == nullptr)
{
LL_WARNS("ExperienceCache") << "Capability query method not set." << LL_ENDL;
return;
}
std::string urlBase = mCapability("GetExperienceInfo");
if (urlBase.empty())
{
LL_DEBUGS("ExperienceCache") << "No Experience capability." << LL_ENDL;
return;
}
if (*urlBase.rbegin() != '/')
{
urlBase += "/";
}
urlBase += "id/";
F64 now = LLFrameTimer::getTotalSeconds();
const U32 EXP_URL_SEND_THRESHOLD = 3000;
constexpr U32 EXP_PAGE_SIZE = EXP_URL_SEND_THRESHOLD / UUID_STR_LENGTH;
std::ostringstream ostr;
ostr << urlBase << "?page_size=" << EXP_PAGE_SIZE;
RequestQueue_t requests;
while (!mRequestQueue.empty())
{
RequestQueue_t::iterator it = mRequestQueue.begin();
LLUUID key = (*it);
mRequestQueue.erase(it);
requests.insert(key);
ostr << "&" << EXPERIENCE_ID << "=" << key.asString();
mPendingQueue[key] = now;
if (mRequestQueue.empty() || (ostr.tellp() > EXP_URL_SEND_THRESHOLD))
{ // request is placed in the coprocedure pool for the ExpCache cache. Throttling is done by the pool itself.
LLHTTPClient::get(ostr.str(), new LLCoroResponder(
boost::bind(&LLExperienceCache::requestExperiencesCoro, this, _1, requests) ));
ostr.str(std::string());
ostr << urlBase << "?page_size=" << EXP_PAGE_SIZE;
requests.clear();
}
}
}
bool LLExperienceCache::isRequestPending(const LLUUID& public_key)
{
bool isPending = false;
const F64 PENDING_TIMEOUT_SECS = 5.0 * 60.0;
PendingQueue_t::const_iterator it = mPendingQueue.find(public_key);
if(it != mPendingQueue.end())
{
F64 expire_time = LLFrameTimer::getTotalSeconds() - PENDING_TIMEOUT_SECS;
isPending = (it->second > expire_time);
}
return isPending;
}
void LLExperienceCache::setCapabilityQuery(LLExperienceCache::CapabilityQuery_t queryfn)
{
mCapability = queryfn;
}
void LLExperienceCache::idleCoro()
{
const F32 SECS_BETWEEN_REQUESTS = 0.5f;
const F32 ERASE_EXPIRED_TIMEOUT = 60.f; // seconds
{
static LLFrameTimer sRequestTimer;
if (!sRequestTimer.checkExpirationAndReset(SECS_BETWEEN_REQUESTS)) return;
if (mEraseExpiredTimer.checkExpirationAndReset(ERASE_EXPIRED_TIMEOUT))
{
eraseExpired();
}
if (!mRequestQueue.empty())
{
requestExperiences();
}
}
// The coroutine system will likely be shut down by the time we get to this point
// (or at least no further cycling will occur on it since the user has decided to quit.)
}
void LLExperienceCache::erase(const LLUUID& key)
{
cache_t::iterator it = mCache.find(key);
if(it != mCache.end())
{
mCache.erase(it);
}
}
void LLExperienceCache::eraseExpired()
{
F64 now = LLFrameTimer::getTotalSeconds();
cache_t::iterator it = mCache.begin();
while (it != mCache.end())
{
cache_t::iterator cur = it;
LLSD& exp = cur->second;
++it;
//LL_INFOS("ExperienceCache") << "Testing experience \"" << exp[NAME] << "\" with exp time " << exp[EXPIRES].asReal() << "(now = " << now << ")" << LL_ENDL;
if(exp.has(EXPIRES) && exp[EXPIRES].asReal() < now)
{
if(!exp.has(EXPERIENCE_ID))
{
LL_WARNS("ExperienceCache") << "Removing experience with no id " << LL_ENDL ;
mCache.erase(cur);
}
else
{
LLUUID id = exp[EXPERIENCE_ID].asUUID();
LLUUID private_key = exp.has(LLExperienceCache::PRIVATE_KEY) ? exp[LLExperienceCache::PRIVATE_KEY].asUUID():LLUUID::null;
if(private_key.notNull() || !exp.has("DoesNotExist"))
{
fetch(id, true);
}
else
{
LL_WARNS("ExperienceCache") << "Removing invalid experience " << id << LL_ENDL ;
mCache.erase(cur);
}
}
}
}
}
bool LLExperienceCache::fetch(const LLUUID& key, bool refresh/* = true*/)
{
if(!key.isNull() && !isRequestPending(key) && (refresh || mCache.find(key)==mCache.end()))
{
LL_DEBUGS("ExperienceCache") << " queue request for " << EXPERIENCE_ID << " " << key << LL_ENDL;
mRequestQueue.insert(key);
return true;
}
return false;
}
void LLExperienceCache::insert(const LLSD& experience_data)
{
if(experience_data.has(EXPERIENCE_ID))
{
processExperience(experience_data[EXPERIENCE_ID].asUUID(), experience_data);
}
else
{
LL_WARNS("ExperienceCache") << ": Ignoring cache insert of experience which is missing " << EXPERIENCE_ID << LL_ENDL;
}
}
const LLSD& LLExperienceCache::get(const LLUUID& key)
{
static const LLSD empty;
if(key.isNull())
return empty;
cache_t::const_iterator it = mCache.find(key);
if (it != mCache.end())
{
return it->second;
}
fetch(key);
return empty;
}
void LLExperienceCache::get(const LLUUID& key, LLExperienceCache::ExperienceGetFn_t slot)
{
if(key.isNull())
return;
cache_t::const_iterator it = mCache.find(key);
if (it != mCache.end())
{
// ...name already exists in cache, fire callback now
callback_signal_t signal;
signal.connect(slot);
signal(it->second);
return;
}
fetch(key);
signal_ptr signal = boost::make_shared<callback_signal_t>();
std::pair<signal_map_t::iterator, bool> result = mSignalMap.insert(signal_map_t::value_type(key, signal));
if (!result.second)
signal = (*result.first).second;
signal->connect(slot);
}
//=========================================================================
void LLExperienceCache::fetchAssociatedExperience(const LLUUID& objectId, const LLUUID& itemId, std::string url, ExperienceGetFn_t fn)
{
if (mCapability == nullptr)
{
LL_WARNS("ExperienceCache") << "Capability query method not set." << LL_ENDL;
return;
}
if (url.empty())
{
url = mCapability("GetMetadata");
if (url.empty())
{
LL_WARNS("ExperienceCache") << "No Metadata capability." << LL_ENDL;
return;
}
}
LLSD fields;
fields.append("experience");
LLSD data;
data["object-id"] = objectId;
data["item-id"] = itemId;
data["fields"] = fields;
LLHTTPClient::post(url, data, new LLCoroResponder(
boost::bind(&LLExperienceCache::fetchAssociatedExperienceCoro, this, _1, fn)));
}
void LLExperienceCache::fetchAssociatedExperienceCoro(const LLCoroResponder& responder, ExperienceGetFn_t fn)
{
LLSD result = responder.getContent();
auto status = responder.getStatus();
if (!responder.isGoodStatus(status) || !result.has("experience"))
{
LLSD failure;
if (!status)
{
failure["error"] = status;
failure["message"] = responder.getReason();
}
else
{
failure["error"] = -1;
failure["message"] = "no experience";
}
if (fn != nullptr)
fn(failure);
return;
}
LLUUID expId = result["experience"].asUUID();
get(expId, fn);
}
//-------------------------------------------------------------------------
void LLExperienceCache::findExperienceByName(const std::string text, int page, ExperienceGetFn_t fn)
{
if (mCapability == nullptr)
{
LL_WARNS("ExperienceCache") << "Capability query method not set." << LL_ENDL;
return;
}
std::ostringstream url;
url << mCapability("FindExperienceByName") << "?page=" << page << "&page_size=" << SEARCH_PAGE_SIZE << "&query=" << LLURI::escape(text);
LLHTTPClient::get(url.str(), new LLCoroResponder(
boost::bind(&LLExperienceCache::findExperienceByNameCoro, this, _1, fn)));
}
void LLExperienceCache::findExperienceByNameCoro(const LLCoroResponder& responder, ExperienceGetFn_t fn)
{
LLSD result = responder.getContent();
if (!responder.isGoodStatus(responder.getStatus()))
{
fn(LLSD());
return;
}
const LLSD& experiences = result["experience_keys"];
for (const auto& it : experiences.array())
{
insert(it);
}
fn(result);
}
//-------------------------------------------------------------------------
void LLExperienceCache::getGroupExperiences(const LLUUID &groupId, ExperienceGetFn_t fn)
{
if (mCapability == nullptr)
{
LL_WARNS("ExperienceCache") << "Capability query method not set." << LL_ENDL;
return;
}
// search for experiences owned by the current group
std::string url = mCapability("GroupExperiences");
if (url.empty())
{
LL_WARNS("ExperienceCache") << "No Group Experiences capability" << LL_ENDL;
return;
}
url += "?" + groupId.asString();
LLHTTPClient::get(url, new LLCoroResponder(
boost::bind(&LLExperienceCache::getGroupExperiencesCoro, this, _1, fn)));
}
void LLExperienceCache::getGroupExperiencesCoro(const LLCoroResponder& responder, ExperienceGetFn_t fn)
{
LLSD result = responder.getContent();
if (!responder.isGoodStatus(responder.getStatus()))
{
fn(LLSD());
return;
}
const LLSD& experienceIds = result["experience_ids"];
fn(experienceIds);
}
//-------------------------------------------------------------------------
void LLExperienceCache::getRegionExperiences(CapabilityQuery_t regioncaps, ExperienceGetFn_t fn)
{
regionExperiences(regioncaps, LLSD(), false, fn);
}
void LLExperienceCache::setRegionExperiences(CapabilityQuery_t regioncaps, const LLSD &experiences, ExperienceGetFn_t fn)
{
regionExperiences(regioncaps, experiences, true, fn);
}
void LLExperienceCache::regionExperiences(CapabilityQuery_t regioncaps, const LLSD &experiences, bool update, ExperienceGetFn_t fn)
{
// search for experiences owned by the current group
std::string url = regioncaps("RegionExperiences");
if (url.empty())
{
LL_WARNS("ExperienceCache") << "No Region Experiences capability" << LL_ENDL;
return;
}
auto httpRequest = new LLCoroResponder(
boost::bind(&LLExperienceCache::regionExperiencesCoro, this, _1, fn));
LLSD result;
if (update)
LLHTTPClient::post(url, experiences, httpRequest);
else
LLHTTPClient::get(url, httpRequest);
}
void LLExperienceCache::regionExperiencesCoro(const LLCoroResponder& responder, ExperienceGetFn_t fn)
{
LLSD result = responder.getContent();
if (!responder.isGoodStatus(responder.getStatus()))
{
// fn(LLSD());
return;
}
fn(result);
}
//-------------------------------------------------------------------------
void LLExperienceCache::getExperiencePermission(const LLUUID &experienceId, ExperienceGetFn_t fn)
{
if (mCapability == nullptr)
{
LL_WARNS("ExperienceCache") << "Capability query method not set." << LL_ENDL;
return;
}
std::string url = mCapability("ExperiencePreferences") + "?" + experienceId.asString();
LLHTTPClient::get(url, new LLCoroResponder(
boost::bind(&LLExperienceCache::experiencePermissionCoro, this, _1, fn)));
}
void LLExperienceCache::setExperiencePermission(const LLUUID &experienceId, const std::string &permission, ExperienceGetFn_t fn)
{
if (mCapability == nullptr)
{
LL_WARNS("ExperienceCache") << "Capability query method not set." << LL_ENDL;
return;
}
std::string url = mCapability("ExperiencePreferences");
if (url.empty())
return;
LLSD permData;
LLSD data;
permData["permission"] = permission;
data[experienceId.asString()] = permData;
LLHTTPClient::put(url, data, new LLCoroResponder(
boost::bind(&LLExperienceCache::experiencePermissionCoro, this, _1, fn)));
}
void LLExperienceCache::forgetExperiencePermission(const LLUUID &experienceId, ExperienceGetFn_t fn)
{
if (mCapability == nullptr)
{
LL_WARNS("ExperienceCache") << "Capability query method not set." << LL_ENDL;
return;
}
std::string url = mCapability("ExperiencePreferences") + "?" + experienceId.asString();
LLHTTPClient::del(url, new LLCoroResponder(
boost::bind(&LLExperienceCache::experiencePermissionCoro, this, _1, fn)));
}
void LLExperienceCache::experiencePermissionCoro(const LLCoroResponder& responder, ExperienceGetFn_t fn)
{
// search for experiences owned by the current group
LLSD result = responder.getContent();
if (responder.isGoodStatus(responder.getStatus()))
{
fn(result);
}
}
//-------------------------------------------------------------------------
void LLExperienceCache::getExperienceAdmin(const LLUUID &experienceId, ExperienceGetFn_t fn)
{
if (mCapability == nullptr)
{
LL_WARNS("ExperienceCache") << "Capability query method not set." << LL_ENDL;
return;
}
std::string url = mCapability("IsExperienceAdmin");
if (url.empty())
{
LL_WARNS("ExperienceCache") << "No Region Experiences capability" << LL_ENDL;
return;
}
url += "?experience_id=" + experienceId.asString();
LLHTTPClient::get(url, new LLCoroResponder(
boost::bind(fn, boost::bind(&LLCoroResponder::getContent, _1))));
}
//-------------------------------------------------------------------------
void LLExperienceCache::updateExperience(LLSD updateData, ExperienceGetFn_t fn)
{
if (mCapability == nullptr)
{
LL_WARNS("ExperienceCache") << "Capability query method not set." << LL_ENDL;
return;
}
std::string url = mCapability("UpdateExperience");
if (url.empty())
{
LL_WARNS("ExperienceCache") << "No Region Experiences capability" << LL_ENDL;
return;
}
updateData.erase(LLExperienceCache::QUOTA);
updateData.erase(LLExperienceCache::EXPIRES);
updateData.erase(LLExperienceCache::AGENT_ID);
LLHTTPClient::post(url, updateData, new LLCoroResponder(
boost::bind(fn, boost::bind(&LLCoroResponder::getContent, _1))));
}
//=========================================================================
void LLExperienceCacheImpl::mapKeys(const LLSD& legacyKeys)
{
for (const auto& exp : legacyKeys.array())
{
if (exp.has(LLExperienceCacheImpl::EXPERIENCE_ID) && exp.has(LLExperienceCacheImpl::PRIVATE_KEY))
{
LLExperienceCacheImpl::privateToPublicKeyMap[exp[LLExperienceCacheImpl::PRIVATE_KEY].asUUID()] =
exp[LLExperienceCacheImpl::EXPERIENCE_ID].asUUID();
}
}
}
// Return time to retry a request that generated an error, based on
// error type and headers. Return value is seconds-since-epoch.
F64 LLExperienceCacheImpl::getErrorRetryDeltaTime(S32 status, const AIHTTPReceivedHeaders& headers)
{
// Retry-After takes priority
std::string retry_afters;
if (headers.getFirstValue("retry-after", retry_afters))
{
LLSD retry_after(retry_afters);
// We only support the delta-seconds type
S32 delta_seconds = retry_after.asInteger();
if (delta_seconds > 0)
{
// ...valid delta-seconds
return F64(delta_seconds);
}
}
// If no Retry-After, look for Cache-Control max-age
// Allow the header to override the default
std::string cache_control;
if (headers.getFirstValue("cache-control", cache_control))
{
S32 max_age = 0;
if (LLExperienceCacheImpl::maxAgeFromCacheControl(cache_control, &max_age))
{
LL_WARNS("ExperienceCache")
<< "got EXPIRES from headers, max_age " << max_age
<< LL_ENDL;
return (F64)max_age;
}
}
// No information in header, make a guess
if (status == 503)
{
// ...service unavailable, retry soon
const F64 SERVICE_UNAVAILABLE_DELAY = 600.0; // 10 min
return SERVICE_UNAVAILABLE_DELAY;
}
else if (status == 499)
{
// ...we were probably too busy, retry quickly
const F64 BUSY_DELAY = 10.0; // 10 seconds
return BUSY_DELAY;
}
else
{
// ...other unexpected error
const F64 DEFAULT_DELAY = 3600.0; // 1 hour
return DEFAULT_DELAY;
}
}
bool LLExperienceCacheImpl::maxAgeFromCacheControl(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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