Merge remote-tracking branch 'secondlife/release/26.4' into 26.4

1 files changed, 384 insertions, 127 deletions

diff --git a/indra/newview/llsyntaxid.cpp b/indra/newview/llsyntaxid.cpp
index f89ae00c5b..58d1287979 100644
--- a/indra/newview/llsyntaxid.cpp
+++ b/indra/newview/llsyntaxid.cpp
@@ -35,39 +35,59 @@
 #include "llviewerregion.h"
 #include "llcorehttputil.h"
 
+
 //-----------------------------------------------------------------------------
 // LLSyntaxIdLSL
 //-----------------------------------------------------------------------------
-const std::string SYNTAX_ID_CAPABILITY_NAME = "LSLSyntax";
-const std::string SYNTAX_ID_SIMULATOR_FEATURE = "LSLSyntaxId";
-const std::string FILENAME_DEFAULT = "keywords_lsl_default.xml";
+namespace
+{
+    const std::string SYNTAX_ID_CAPABILITY_NAME   = "LSLSyntax";
+    const std::string SYNTAX_DEF_CAPABILITY_NAME  = "ScriptDefinitions";
+    const std::string SYNTAX_ID_SIMULATOR_FEATURE = "LSLSyntaxId";
+    const std::string FILENAME_INTERNAL_LSL        = "lsl_keywords.xml";
+    const std::string FILENAME_INTERNAL_LUA        = "lua_keywords.xml";
+    const std::string FILENAME_DEFAULT_LSL         = "keywords_lsl_default.xml";
+    const std::string FILENAME_DEFAULT_LUA         = "keywords_lua_default.xml";
 
-/**
- * @brief LLSyntaxIdLSL constructor
- */
-LLSyntaxIdLSL::LLSyntaxIdLSL()
-:   mKeywordsXml(LLSD())
-,   mCapabilityURL(std::string())
-,   mFilePath(LL_PATH_APP_SETTINGS)
-,   mSyntaxId(LLUUID())
-,   mInitialized(false)
+    constexpr U32     LLSD_SYNTAX_LSL_VERSION_EXPECTED = 2;
+    const std::string LLSD_SYNTAX_LSL_VERSION_KEY("llsd-lsl-syntax-version");
+
+    const std::unordered_set<std::string> MEMCACHED_LLSD = {
+        FILENAME_INTERNAL_LSL,
+        FILENAME_INTERNAL_LUA
+    };
+} // namespace
+
+//========================================================================
+void LLSyntaxDefCache::initSingleton()
 {
-    loadDefaultKeywordsIntoLLSD();
-    mRegionChangedCallback = gAgent.addRegionChangedCallback(boost::bind(&LLSyntaxIdLSL::handleRegionChanged, this));
+    buildDefaultCache();
+    loadKeywordsIntoLLSD();
+    mRegionChangedCallback = gAgent.addRegionChangedCallback(boost::bind(&LLSyntaxDefCache::handleRegionChanged, this));
     handleRegionChanged(); // Kick off an initial caps query and fetch
 }
 
-void LLSyntaxIdLSL::buildFullFileSpec()
+void LLSyntaxDefCache::cleanupSingleton()
 {
-    ELLPath path = mSyntaxId.isNull() ? LL_PATH_APP_SETTINGS : LL_PATH_CACHE;
-    const std::string filename = mSyntaxId.isNull() ? FILENAME_DEFAULT : "keywords_lsl_" + mSyntaxId.asString() + ".llsd.xml";
-    mFullFileSpec = gDirUtilp->getExpandedFilename(path, filename);
+    gAgent.removeRegionChangedCallback(mRegionChangedCallback);
+    mLSLKeywords   = LLSD();
+    mLuaKeywords = LLSD();
+    mCapabilityURL = std::string();
+    mSyntaxId = LLUUID();
+    mFileCachePaths.clear();
 }
 
-//-----------------------------------------------------------------------------
-// syntaxIdChange()
-//-----------------------------------------------------------------------------
-bool LLSyntaxIdLSL::syntaxIdChanged()
+boost::signals2::connection LLSyntaxDefCache::addSyntaxIDCallback(const syntax_id_changed_signal_t::slot_type& cb)
+{
+    return mSyntaxIDChangedSignal.connect(cb);
+}
+
+//========================================================================
+// checkSyntaxId()
+// Checks the current region for the LSLSyntaxId feature and capability, and
+// if found checks the syntax ID against the one we have. If they differ,
+// updates the syntax ID and returns true. Otherwise returns false.
+bool LLSyntaxDefCache::updateSyntaxId()
 {
     LLViewerRegion* region = gAgent.getRegion();
 
@@ -82,51 +102,97 @@ bool LLSyntaxIdLSL::syntaxIdChanged()
             {
                 // get and check the hash
                 LLUUID new_syntax_id = sim_features[SYNTAX_ID_SIMULATOR_FEATURE].asUUID();
-                mCapabilityURL = region->getCapability(SYNTAX_ID_CAPABILITY_NAME);
+
+                // *Note* the syntax ID may not have changed, but the region almost certainly has.
+                // update the cap URL
+                mCapabilityURL = region->getCapability(SYNTAX_DEF_CAPABILITY_NAME);
+                mUseDefsCap    = !mCapabilityURL.empty();
+                if (!mUseDefsCap)
+                {
+                    mCapabilityURL = region->getCapability(SYNTAX_ID_CAPABILITY_NAME);
+                }
                 LL_DEBUGS("SyntaxLSL") << SYNTAX_ID_SIMULATOR_FEATURE << " capability URL: " << mCapabilityURL << LL_ENDL;
+
                 if (new_syntax_id != mSyntaxId)
                 {
                     LL_DEBUGS("SyntaxLSL") << "New SyntaxID '" << new_syntax_id << "' found." << LL_ENDL;
                     mSyntaxId = new_syntax_id;
                     return true;
                 }
-                else
-                    LL_DEBUGS("SyntaxLSL") << "SyntaxID matches what we have." << LL_ENDL;
+
+                LL_DEBUGS("SyntaxLSL") << "SyntaxID has not changed. Still " << mSyntaxId << LL_ENDL;
             }
         }
         else
         {
-            region->setCapabilitiesReceivedCallback(boost::bind(&LLSyntaxIdLSL::handleCapsReceived, this, _1));
+            region->setCapabilitiesReceivedCallback(boost::bind(&LLSyntaxDefCache::handleCapsReceived, this, _1));
             LL_DEBUGS("SyntaxLSL") << "Region has not received capabilities. Waiting for caps..." << LL_ENDL;
         }
     }
     return false;
 }
 
+void LLSyntaxDefCache::handleRegionChanged()
+{
+    if (updateSyntaxId())
+    {
+        if (!checkCacheAndLoad(mSyntaxId))
+        {
+            fetchKeywords();
+        }
+    }
+}
+
+void LLSyntaxDefCache::handleCapsReceived(const LLUUID& region_uuid)
+{
+    LLViewerRegion* current_region = gAgent.getRegion();
+
+    if (region_uuid.notNull() && current_region->getRegionID() == region_uuid)
+    {
+        updateSyntaxId();
+        if (!checkCacheAndLoad(mSyntaxId))
+        {
+            fetchKeywords();
+        }
+    }
+}
+
 //-----------------------------------------------------------------------------
-// fetchKeywordsFile
-//-----------------------------------------------------------------------------
-void LLSyntaxIdLSL::fetchKeywordsFile(const std::string& filespec)
+// fetchKeywords
+// Initiates a fetch of the current language definitions from the region caps.
+void LLSyntaxDefCache::fetchKeywords()
 {
-    LLCoros::instance().launch("LLSyntaxIdLSL::fetchKeywordsFileCoro",
-        boost::bind(&LLSyntaxIdLSL::fetchKeywordsFileCoro, this, mCapabilityURL, filespec));
-    LL_DEBUGS("SyntaxLSL") << "LSLSyntaxId capability URL is: " << mCapabilityURL << ". Filename to use is: '" << filespec << "'." << LL_ENDL;
+    if (mCapabilityURL.empty())
+    {
+        LL_WARNS("SyntaxLSL") << "No capability URL for fetching syntax definitions." << LL_ENDL;
+        return;
+    }
+    if (mUseDefsCap)
+    {
+        LLCoros::instance().launch("LLSyntaxDefCache::fetchKeywordsDefsCoro",
+            boost::bind(&LLSyntaxDefCache::fetchKeywordsDefsCoro, this, mCapabilityURL, mSyntaxId));
+    }
+    else
+    {
+        LLCoros::instance().launch("LLSyntaxDefCache::fetchKeywordsFileCoro",
+            boost::bind(&LLSyntaxDefCache::fetchKeywordsFileCoro, this, mCapabilityURL, mSyntaxId));
+    }
 }
 
 //-----------------------------------------------------------------------------
 // fetchKeywordsFileCoro
-//-----------------------------------------------------------------------------
-void LLSyntaxIdLSL::fetchKeywordsFileCoro(std::string url, std::string fileSpec)
+// This uses the legacy language cap which only sends the LSL keywords file.
+void LLSyntaxDefCache::fetchKeywordsFileCoro(std::string url, LLUUID syntax_id)
 {
     LLCore::HttpRequest::policy_t httpPolicy(LLCore::HttpRequest::DEFAULT_POLICY_ID);
     LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t
         httpAdapter = std::make_shared<LLCoreHttpUtil::HttpCoroutineAdapter>("fetchKeywordsFileCoro", httpPolicy);
     LLCore::HttpRequest::ptr_t httpRequest = std::make_shared<LLCore::HttpRequest>();
 
-    std::pair<std::set<std::string>::iterator, bool> insrt = mInflightFetches.insert(fileSpec);
+    auto insrt = mInflightFetches.insert(syntax_id);
     if (!insrt.second)
     {
-        LL_WARNS("SyntaxLSL") << "Already downloading keyword file called \"" << fileSpec << "\"." << LL_ENDL;
+        LL_WARNS("SyntaxLSL") << "Already downloading keyword file for syntax ID \"" << syntax_id << "\"." << LL_ENDL;
         return;
     }
 
@@ -135,11 +201,11 @@ void LLSyntaxIdLSL::fetchKeywordsFileCoro(std::string url, std::string fileSpec)
     LLSD httpResults = result[LLCoreHttpUtil::HttpCoroutineAdapter::HTTP_RESULTS];
     LLCore::HttpStatus status = LLCoreHttpUtil::HttpCoroutineAdapter::getStatusFromLLSD(httpResults);
 
-    mInflightFetches.erase(fileSpec);
+    mInflightFetches.erase(syntax_id);
 
     if (!status)
     {
-        LL_WARNS("SyntaxLSL") << "Failed to fetch syntax file \"" << fileSpec << "\"" << LL_ENDL;
+        LL_WARNS("SyntaxLSL") << "Failed to fetch syntax file for syntax ID \"" << syntax_id << "\"" << LL_ENDL;
         return;
     }
 
@@ -147,9 +213,39 @@ void LLSyntaxIdLSL::fetchKeywordsFileCoro(std::string url, std::string fileSpec)
 
     if (isSupportedVersion(result))
     {
-        setKeywordsXml(result);
-        cacheFile(fileSpec, result);
-        loadKeywordsIntoLLSD();
+        std::string path = buildCacheDirectoryName(syntax_id);
+
+        if (!LLFile::exists(path))
+        {
+            LL_DEBUGS("SyntaxLSL") << "Cache directory '" << path << "' does not exist. Attempting to create." << LL_ENDL;
+            if (LLFile::mkdir(path))
+            {
+                LL_WARNS("SyntaxLSL") << "Failed to create cache directory '" << path << "'. Cannot cache syntax defs file." << LL_ENDL;
+                return;
+            }
+        }
+
+        // Note that after this call the file cache will have all well known files pointing
+        // to the default versions, so below, where we get the path to the lua keywords
+        // well be loading the default version.
+        buildDefaultCache();
+
+        // The LSL keywords we just received
+        std::string full_path = gDirUtilp->add(path, FILENAME_INTERNAL_LSL);
+        if (writeCacheFile(full_path, result))
+        {
+            mFileCachePaths.addNamePath(FILENAME_INTERNAL_LSL, full_path);
+        }
+        // We need to manually load the Lua keywords
+        full_path     = mFileCachePaths.getPath(FILENAME_INTERNAL_LUA);
+        LLSD lua_defs = loadDeserializedCacheFile(full_path);
+
+        setKeywords(result, lua_defs);
+
+        // Shuttle this task to the main coro/worker.
+        LLAppViewer::instance()->postToMainCoro([this]() {
+                mSyntaxIDChangedSignal();
+            });
     }
     else
     {
@@ -158,73 +254,212 @@ void LLSyntaxIdLSL::fetchKeywordsFileCoro(std::string url, std::string fileSpec)
 
 }
 
-//-----------------------------------------------------------------------------
-// cacheFile
-//-----------------------------------------------------------------------------
-void LLSyntaxIdLSL::cacheFile(const std::string &fileSpec, const LLSD& content_ref)
+void LLSyntaxDefCache::fetchKeywordsDefsCoro(std::string url, LLUUID syntax_id)
 {
-    std::stringstream str;
-    LLSDSerialize::toXML(content_ref, str);
-    const std::string xml = str.str();
+    LLCore::HttpRequest::policy_t               httpPolicy(LLCore::HttpRequest::DEFAULT_POLICY_ID);
+    LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t httpAdapter =
+        std::make_shared<LLCoreHttpUtil::HttpCoroutineAdapter>("fetchKeywordsDefsCoro", httpPolicy);
+    LLCore::HttpRequest::ptr_t httpRequest = std::make_shared<LLCore::HttpRequest>();
 
-    // save the str to disk, usually to the cache.
-    llofstream file(fileSpec.c_str(), std::ios_base::out);
-    file.write(xml.c_str(), str.str().size());
-    file.close();
+    static std::set<LLUUID> inflightDefsFetches;
+    auto insrt = inflightDefsFetches.insert(syntax_id);
+    //auto insrt = mInflightFetches.insert(syntax_id);
+    if (!insrt.second)
+    {
+        LL_WARNS("SyntaxLSL") << "Already downloading keyword defs for \"" << syntax_id << "\"." << LL_ENDL;
+        return;
+    }
 
-    LL_DEBUGS("SyntaxLSL") << "Syntax file received, saving as: '" << fileSpec << "'" << LL_ENDL;
-}
+    LLSD result = httpAdapter->getAndSuspend(httpRequest, url);
 
-//-----------------------------------------------------------------------------
-// initialize
-//-----------------------------------------------------------------------------
-void LLSyntaxIdLSL::initialize()
-{
-    if(mInitialized) return;
-    if (mSyntaxId.isNull())
+    LLSD               httpResults = result[LLCoreHttpUtil::HttpCoroutineAdapter::HTTP_RESULTS];
+    LLCore::HttpStatus status      = LLCoreHttpUtil::HttpCoroutineAdapter::getStatusFromLLSD(httpResults);
+
+    inflightDefsFetches.erase(syntax_id);
+
+    if (!status)
     {
-        loadDefaultKeywordsIntoLLSD();
+        LL_WARNS("SyntaxLSL") << "Failed to fetch syntax file \"" << syntax_id << "\"" << LL_ENDL;
+        result.erase(LLCoreHttpUtil::HttpCoroutineAdapter::HTTP_RESULTS);
+        return;
     }
-    else if (!mCapabilityURL.empty())
+
+    // Now we need to walk through the returned LLSD.  It consists of a map keyed on the file name containing a binary
+    // blob of the actual file contents.
+    LLSD files = result["files"];
+    // A region may omit definitions for languages it does not support. Keep
+    // the defaults/current definitions for any omitted file.
+    LLSD lsl_keywords = mLSLKeywords;
+    LLSD lua_keywords = mLuaKeywords;
+    if (files.isMap())
     {
-        LL_DEBUGS("SyntaxLSL") << "LSL version has changed, getting appropriate file." << LL_ENDL;
+        std::string path = buildCacheDirectoryName(syntax_id);
 
-        // Need a full spec regardless of file source, so build it now.
-        buildFullFileSpec();
-        if (mSyntaxId.notNull())
+        if (!LLFile::exists(path))
         {
-            if (!gDirUtilp->fileExists(mFullFileSpec))
-            { // Does not exist, so fetch it from the capability
-                LL_DEBUGS("SyntaxLSL") << "LSL syntax not cached, attempting download." << LL_ENDL;
-                fetchKeywordsFile(mFullFileSpec);
-            }
-            else
+            LL_DEBUGS("SyntaxLSL") << "Cache directory '" << path << "' does not exist. Attempting to create." << LL_ENDL;
+            if (LLFile::mkdir(path))
             {
-                LL_DEBUGS("SyntaxLSL") << "Found cached Syntax file: " << mFullFileSpec << " Loading keywords." << LL_ENDL;
-                loadKeywordsIntoLLSD();
+                LL_WARNS("SyntaxLSL") << "Failed to create cache directory '" << path << "'. Cannot cache syntax defs file." << LL_ENDL;
+                return;
             }
         }
-        else
+
+        buildDefaultCache();
+
+        for (const auto &[filename, contents] : llsd::inMap(files))
         {
-            LL_DEBUGS("SyntaxLSL") << "LSLSyntaxId is null. Loading default values" << LL_ENDL;
-            loadDefaultKeywordsIntoLLSD();
+            std::string full_path = gDirUtilp->add(path, filename);
+
+            if (filename == FILENAME_INTERNAL_LSL)
+            {
+                lsl_keywords = contents;
+            }
+            else if (filename == FILENAME_INTERNAL_LUA)
+            {
+                lua_keywords = contents;
+            }
+
+            if (writeCacheFile(full_path, contents))
+            {
+                mFileCachePaths.addNamePath(filename, full_path);
+            }
         }
     }
     else
     {
-        LL_DEBUGS("SyntaxLSL") << "LSLSyntaxId capability URL is empty." << LL_ENDL;
-        loadDefaultKeywordsIntoLLSD();
+        LL_WARNS("SyntaxLSL") << "Malformed syntax defs response, missing 'files' map." << LL_ENDL;
     }
-    mInitialized = true;
+
+    result.erase(LLCoreHttpUtil::HttpCoroutineAdapter::HTTP_RESULTS);
+
+    setKeywords(lsl_keywords, lua_keywords);
+    LLAppViewer::instance()->postToMainCoro(
+        [this]()
+        {
+            mSyntaxIDChangedSignal();
+        });
+}
+
+//-----------------------------------------------------------------------------
+// buildCache
+// Constructs the cache file paths for the given syntax ID. If the syntax ID is null,
+// constructs the default cache file paths.
+void LLSyntaxDefCache::buildCachePaths(const LLUUID &syntax_id)
+{
+    if (syntax_id.notNull())
+    {   // Initialize the cache files to point to the default files
+        buildCachePaths(LLUUID::null);
+    }
+    else
+    {
+        mFileCachePaths.clear();
+        mFileCachePaths.addNamePath(
+            FILENAME_INTERNAL_LSL,
+            gDirUtilp->getExpandedFilename(LL_PATH_APP_SETTINGS, FILENAME_DEFAULT_LSL));
+        mFileCachePaths.addNamePath(
+            FILENAME_INTERNAL_LUA,
+            gDirUtilp->getExpandedFilename(LL_PATH_APP_SETTINGS, FILENAME_DEFAULT_LUA));
+        return;
+    }
+
+    std::string cache_dir = buildCacheDirectoryName(syntax_id);
+    if (!LLFile::exists(cache_dir))
+    {
+        LL_DEBUGS("SyntaxLSL") << "Cache directory '" << cache_dir << "' does not exist." << LL_ENDL;
+        return;
+    }
+
+    auto files =  gDirUtilp->getFilesInDir(cache_dir);
+    for (const auto &file : files)
+    {
+        mFileCachePaths.addNamePath(file, gDirUtilp->add(cache_dir, file));
+    }
+}
+
+bool LLSyntaxDefCache::writeCacheFile(const std::string &fileSpec, const LLSD& content_ref)
+{
+    bool                    binary(content_ref.isBinary());
+    std::ios_base::openmode mode(binary ? (std::ios_base::out | std::ios_base::binary)
+                                        : std::ios_base::out);
+    std::ofstream           file(fileSpec.c_str(), mode);
+
+    if (!file.is_open())
+    {
+        LL_WARNS("SyntaxLSL") << "Failed to open file for writing: '" << fileSpec << "'" << LL_ENDL;
+        return false;
+    }
+
+    if (binary)
+    {
+        LL_DEBUGS("SyntaxLSL") << "Caching raw content to '" << fileSpec << "'" << LL_ENDL;
+        file.write((const char*)content_ref.asBinary().data(), content_ref.asBinary().size());
+    }
+    else
+    {
+        LL_DEBUGS("SyntaxLSL") << "Caching XML content to '" << fileSpec << "'" << LL_ENDL;
+        LLSDSerialize::serialize(content_ref, file, LLSDSerialize::LLSD_XML, LLSDFormatter::OPTIONS_PRETTY);
+    }
+    file.close();
+
+    if (!file.good())
+    {
+        LL_WARNS("SyntaxLSL") << "Failed to write content to file: '" << fileSpec << "'" << LL_ENDL;
+        return false;
+    }
+    return true;
+}
+
+//-----------------------------------------------------------------------------
+// checkCacheAndLoad
+// Tests the local cache for the given syntax ID. If found it loads the keywords
+// from the cache into LLSD and returns true. Otherwise returns false.
+bool LLSyntaxDefCache::checkCacheAndLoad(const LLUUID& syntax_id)
+{
+    if (checkLocalCache(syntax_id))
+    {
+        buildCachePaths(syntax_id);
+        loadKeywordsIntoLLSD();
+        return true;
+    }
+    return false;
+}
+
+std::string LLSyntaxDefCache::buildCacheDirectoryName(const LLUUID& syntax_id)
+{
+    if (syntax_id.isNull())
+    {
+        LL_DEBUGS("SyntaxLSL") << "No SyntaxID, using app settings directory." << LL_ENDL;
+        return gDirUtilp->getExpandedFilename(LL_PATH_APP_SETTINGS, "syntax_default");
+    }
+    else
+    {
+        LL_DEBUGS("SyntaxLSL") << "Using cache directory for SyntaxID '" << syntax_id << "'." << LL_ENDL;
+        std::string cache_dir_name = "syntax_" + syntax_id.asString();
+
+        return gDirUtilp->getExpandedFilename(LL_PATH_CACHE, cache_dir_name);
+    }
+}
+
+bool LLSyntaxDefCache::checkLocalCache(const LLUUID& syntax_id) const
+{
+    if (syntax_id.isNull())
+    { // Cache check will always fail if we don't have a valid SyntaxID, so skip it in that case.
+        LL_DEBUGS("SyntaxLSL") << "No SyntaxID, skipping local cache check." << LL_ENDL;
+        return false;
+    }
+
+    // Check for the existence of the cache directory for this syntax ID. If it doesn't exist, then we don't have a cached file.
+    std::string cache_dir = buildCacheDirectoryName(syntax_id);
+    return gDirUtilp->fileExists(cache_dir);
 }
 
+
 //-----------------------------------------------------------------------------
 // isSupportedVersion
 //-----------------------------------------------------------------------------
-const U32         LLSD_SYNTAX_LSL_VERSION_EXPECTED = 2;
-const std::string LLSD_SYNTAX_LSL_VERSION_KEY("llsd-lsl-syntax-version");
 
-bool LLSyntaxIdLSL::isSupportedVersion(const LLSD& content)
+bool LLSyntaxDefCache::isSupportedVersion(const LLSD& content)
 {
     bool is_valid = false;
     /*
@@ -250,78 +485,100 @@ bool LLSyntaxIdLSL::isSupportedVersion(const LLSD& content)
 }
 
 //-----------------------------------------------------------------------------
-// loadDefaultKeywordsIntoLLSD()
-//-----------------------------------------------------------------------------
-void LLSyntaxIdLSL::loadDefaultKeywordsIntoLLSD()
-{
-    mSyntaxId.setNull();
-    buildFullFileSpec();
-    loadKeywordsIntoLLSD();
-}
-
-//-----------------------------------------------------------------------------
-// loadKeywordsFileIntoLLSD
+// loadKeywordsIntoLLSD
 //-----------------------------------------------------------------------------
 /**
  * @brief   Load xml serialized LLSD
- * @desc    Opens the specified filespec and attempts to deserializes the
- *          contained data to the specified LLSD object. indicate success/failure with
- *          sLoaded/sLoadFailed members.
+ * @desc    Open the internal lsl keywords files and deserialize them into the correct
+ *          members.
  */
-void LLSyntaxIdLSL::loadKeywordsIntoLLSD()
+void LLSyntaxDefCache::loadKeywordsIntoLLSD()
 {
-    LLSD content;
-    llifstream file;
-    file.open(mFullFileSpec.c_str());
-    if (file.is_open())
+    for (auto& filename : MEMCACHED_LLSD)
     {
-        if (LLSDSerialize::fromXML(content, file) != LLSDParser::PARSE_FAILURE)
+        // Note, in the case of the legacy language cap (it only delivers the LSL keywords file)
+        // The mFileCachePaths will have been initialized in such a way that the Lua keywords
+        // point to the default file.
+        std::string full_path = mFileCachePaths.getPath(filename);
+        if (!full_path.empty())
         {
-            if (isSupportedVersion(content))
+            LLSD content = loadDeserializedCacheFile(full_path);
+            if (!content.isUndefined() && isSupportedVersion(content))
             {
-                LL_DEBUGS("SyntaxLSL") << "Deserialized: " << mFullFileSpec << LL_ENDL;
+                LL_DEBUGS("SyntaxLSL") << "Deserialized cached file: " << full_path << LL_ENDL;
+                if (filename == FILENAME_INTERNAL_LSL)
+                {
+                    mLSLKeywords = content;
+                }
+                else if (filename == FILENAME_INTERNAL_LUA)
+                {
+                    mLuaKeywords = content;
+                }
             }
             else
             {
-                LL_WARNS("SyntaxLSL") << "Unknown or unsupported version of syntax file." << LL_ENDL;
+                LL_WARNS("SyntaxLSL") << "Unknown or unsupported version of syntax file " << full_path << "." << LL_ENDL;
             }
         }
     }
-    else
-    {
-        LL_WARNS("SyntaxLSL") << "Failed to open: " << mFullFileSpec << LL_ENDL;
-    }
-    mKeywordsXml = content;
+
     mSyntaxIDChangedSignal();
 }
 
-bool LLSyntaxIdLSL::keywordFetchInProgress()
+std::vector<std::string> LLSyntaxDefCache::getCacheFileNames() const
 {
-    return !mInflightFetches.empty();
+    std::vector<std::string> names;
+    for (const auto& [name, path] : mFileCachePaths)
+    {
+        names.push_back(name);
+    }
+    return names;
 }
 
-void LLSyntaxIdLSL::handleRegionChanged()
+LLSD LLSyntaxDefCache::loadDeserializedCacheFile(const std::string& file_path)
 {
-    if (syntaxIdChanged())
+    std::ifstream file(file_path.c_str());
+    if (file.good())
+    {
+        LLSD content;
+        if (LLSDSerialize::deserialize(content, file, -1))
+        {
+            return content;
+        }
+    }
+    else
     {
-        buildFullFileSpec();
-        fetchKeywordsFile(mFullFileSpec);
-        mInitialized = false;
+        LL_WARNS("SyntaxLSL") << "Failed to open cached file: " << file_path << LL_ENDL;
     }
+    return LLSD();
 }
 
-void LLSyntaxIdLSL::handleCapsReceived(const LLUUID& region_uuid)
+std::string LLSyntaxDefCache::loadCacheFile(const std::string& name) const
 {
-    LLViewerRegion* current_region = gAgent.getRegion();
-
-    if (region_uuid.notNull()
-        && current_region->getRegionID() == region_uuid)
+    std::string full_path = mFileCachePaths.getPath(name);
+    if (!full_path.empty())
     {
-        syntaxIdChanged();
+        std::ifstream file(full_path.c_str());
+        if (file.good())
+        {
+            std::ostringstream ss;
+            ss << file.rdbuf();
+            return (file.good()) ? ss.str() : std::string();
+        }
+        else
+        {
+            LL_WARNS("SyntaxLSL") << "Failed to open cached file: " << full_path << LL_ENDL;
+        }
     }
+    return std::string();
 }
 
-boost::signals2::connection LLSyntaxIdLSL::addSyntaxIDCallback(const syntax_id_changed_signal_t::slot_type& cb)
+LLSD LLSyntaxDefCache::loadCacheFileAsLLSD(const std::string& name) const
 {
-    return mSyntaxIDChangedSignal.connect(cb);
+    std::string full_path = mFileCachePaths.getPath(name);
+    if (!full_path.empty())
+    {
+        return loadDeserializedCacheFile(full_path);
+    }
+    return LLSD();
 }