Cut redundant work and duplication from the preset cache paths

The schema fingerprint, filament library version and cache blob are no longer recomputed, re-read or copied once per vendor on the startup path, and the setup wizard's completeness check now sees vendors shipped as caches alone. Duplicated reset/join/slurp blocks are folded into helpers.
2026-09-14 12:37:46 +00:00 · 2026-07-29 21:56:17 +08:00
parent e5aa9a8cfc
commit ba5ecdfea9
9 changed files with 145 additions and 115 deletions
--- a/src/dev-utils/generate_system_cache.cpp
+++ b/src/dev-utils/generate_system_cache.cpp
@@ -6,7 +6,6 @@
 #include <boost/filesystem.hpp>
 #include <boost/log/trivial.hpp>
 #include <boost/program_options.hpp>
-#include <boost/system/error_code.hpp>
 #include <iostream>

 using namespace Slic3r;
--- a/src/libslic3r/Config.hpp
+++ b/src/libslic3r/Config.hpp
@@ -27,6 +27,9 @@

 #include <cereal/access.hpp>
 #include <cereal/types/base_class.hpp>
+// The serialize() members below archive ConfigOption hierarchies through
+// cereal::base_class, whose registration machinery lives in polymorphic.hpp.
+#include <cereal/types/polymorphic.hpp>

 namespace Slic3r {
    struct FloatOrPercent
--- a/src/libslic3r/Preset.hpp
+++ b/src/libslic3r/Preset.hpp
@@ -16,13 +16,7 @@
 #include "Semver.hpp"
 #include "ProjectTask.hpp"

-#include <cereal/archives/binary.hpp>
-#include <cereal/cereal.hpp>
-#include <cereal/types/map.hpp>
-#include <cereal/types/polymorphic.hpp>
-#include <cereal/types/set.hpp>
-#include <cereal/types/string.hpp>
-#include <cereal/types/vector.hpp>
+#include <cereal/access.hpp>

 //BBS: change system directories
 #define PRESET_SYSTEM_DIR      "system"
--- a/src/libslic3r/PresetBundle.cpp
+++ b/src/libslic3r/PresetBundle.cpp
@@ -6,8 +6,11 @@
 #include "PresetBundle.hpp"

 #include <boost/crc.hpp>
+#include <boost/iostreams/device/array.hpp>
+#include <boost/iostreams/stream.hpp>
 #include <cereal/archives/binary.hpp>
 #include <cereal/types/map.hpp>
+#include <cereal/types/set.hpp>
 #include <cereal/types/string.hpp>
 #include <cereal/types/vector.hpp>
 #include "PrintConfig.hpp"
@@ -2281,6 +2284,15 @@ Semver installed_vendor_version(const std::string& vendor)
    return ver ? *ver : Semver();
 }

+void remove_installed_vendor(const std::string& vendor)
+{
+    const boost::filesystem::path dir = boost::filesystem::path(data_dir()) / PRESET_SYSTEM_DIR;
+    boost::filesystem::remove(dir / (vendor + ".json"));
+    boost::filesystem::remove(dir / (vendor + ".opc"));
+    if (boost::filesystem::exists(dir / vendor))
+        boost::filesystem::remove_all(dir / vendor);
+}
+
 std::set<std::string> vendor_names_in(const boost::filesystem::path& dir)
 {
    std::set<std::string> names;
@@ -2298,21 +2310,21 @@ std::set<std::string> vendor_names_in(const boost::filesystem::path& dir)
 // generated before that profile was bumped is out of date, and a cache that cannot
 // be read is no installation at all — and the vendor is installed the way it was
 // before caches existed, as its profile and the preset JSONs it points at. Returns
-// the version the cache is stamped with, or nothing when it is not the form to install.
-static std::string installable_cache_version(const boost::filesystem::path& dir, const std::string& vendor)
+// the version the cache is stamped with, invalid when it is not the form to install.
+static Semver installable_cache_version(const boost::filesystem::path& dir, const std::string& vendor)
 {
    const auto cache_ver = Semver::parse(PresetBundle::peek_vendor_cache_version((dir / (vendor + ".opc")).string(), vendor));
    if (! cache_ver)
-        return {};
+        return Semver::invalid();
    const Semver profile_ver = get_version_from_json((dir / (vendor + ".json")).string());
-    return profile_ver.valid() && *cache_ver < profile_ver ? std::string() : cache_ver->to_string();
+    return profile_ver.valid() && *cache_ver < profile_ver ? Semver::invalid() : *cache_ver;
 }

 Semver resource_vendor_version(const std::string& vendor)
 {
    const boost::filesystem::path dir = boost::filesystem::path(resources_dir()) / "profiles";
-    const auto ver = Semver::parse(installable_cache_version(dir, vendor));
-    return ver ? *ver : get_version_from_json((dir / (vendor + ".json")).string());
+    const Semver ver = installable_cache_version(dir, vendor);
+    return ver.valid() ? ver : get_version_from_json((dir / (vendor + ".json")).string());
 }

 bool install_vendor_bundles_from_resources(
@@ -2347,7 +2359,7 @@ bool install_vendor_bundles_from_resources(

            std::string error_message;
            bool installed_cache = false;
-            if (! installable_cache_version(rsrc_path, bundle).empty()) {
+            if (installable_cache_version(rsrc_path, bundle).valid()) {
                installed_cache = copy_file(cache_in_rsrc.string(), cache_in_vendors.string(), error_message, false) == CopyFileResult::SUCCESS;
                if (! installed_cache)
                    BOOST_LOG_TRIVIAL(warning) << "Failed to copy " << bundle << ".opc: " << error_message;
@@ -2405,6 +2417,17 @@ bool install_vendor_bundles_from_resources(
    return true;
 }

+// m_printer_hold_alias survives reset() (and a cache body that failed partway
+// in), so every full-bundle rebuild clears all five collections' maps by hand.
+void PresetBundle::clear_printer_hold_aliases()
+{
+    this->prints.m_printer_hold_alias.clear();
+    this->sla_prints.m_printer_hold_alias.clear();
+    this->filaments.m_printer_hold_alias.clear();
+    this->sla_materials.m_printer_hold_alias.clear();
+    this->printers.m_printer_hold_alias.clear();
+}
+
 //BBS: add json related logic, load system presets from json
 std::pair<PresetsConfigSubstitutions, std::string> PresetBundle::load_system_presets_from_json(ForwardCompatibilitySubstitutionRule compatibility_rule)
 {
@@ -2456,11 +2479,7 @@ std::pair<PresetsConfigSubstitutions, std::string> PresetBundle::load_system_pre
            // Match a fresh launch before parsing: hold aliases and the error
            // counter survive reset(), and would otherwise leak prior-cycle
            // state into the library cache the load below writes.
-            this->prints.m_printer_hold_alias.clear();
-            this->sla_prints.m_printer_hold_alias.clear();
-            this->filaments.m_printer_hold_alias.clear();
-            this->sla_materials.m_printer_hold_alias.clear();
-            this->printers.m_printer_hold_alias.clear();
+            this->clear_printer_hold_aliases();
            this->m_errors = 0;
            append(substitutions, this->load_vendor_configs_from_json(dir.string(), orca_lib_vendor, PresetBundle::LoadSystem, compatibility_rule).first);
            first = false;
@@ -2479,6 +2498,11 @@ std::pair<PresetsConfigSubstitutions, std::string> PresetBundle::load_system_pre
    std::vector<PresetsConfigSubstitutions>         parallel_substitutions(other_vendors.size());
    std::vector<std::string>                        parallel_errors(other_vendors.size());

+    // The filament library version every vendor below is judged against. Fixed
+    // from here on — step 1 was the last thing that could touch the library on
+    // disk — so resolve it once instead of once per vendor.
+    const std::string lib_version = effective_lib_version(dir);
+
    tbb::parallel_for(tbb::blocked_range<size_t>(0, other_vendors.size()),
        [&](const tbb::blocked_range<size_t>& range) {
            for (size_t i = range.begin(); i < range.end(); ++i) {
@@ -2487,7 +2511,7 @@ std::pair<PresetsConfigSubstitutions, std::string> PresetBundle::load_system_pre
                bundle->set_generate_vendor_caches(m_generate_vendor_caches);
                try {
                    auto result = bundle->load_vendor_configs_from_json(
-                        dir.string(), other_vendors[i], PresetBundle::LoadSystem, compatibility_rule, this);
+                        dir.string(), other_vendors[i], PresetBundle::LoadSystem, compatibility_rule, this, lib_version);
                    parallel_substitutions[i] = std::move(result.first);
                    parallel_bundles[i] = std::move(bundle);
                } catch (const std::runtime_error &err) {
@@ -4953,7 +4977,8 @@ void PresetBundle::load_config_file_config(const std::string &name_or_path, bool

 //BBS: Load a config bundle file from json
 std::pair<PresetsConfigSubstitutions, size_t> PresetBundle::load_vendor_configs_from_json(
-    const std::string &dir, const std::string &vendor_name, LoadConfigBundleAttributes flags, ForwardCompatibilitySubstitutionRule compatibility_rule, const PresetBundle* base_bundle)
+    const std::string &dir, const std::string &vendor_name, LoadConfigBundleAttributes flags, ForwardCompatibilitySubstitutionRule compatibility_rule, const PresetBundle* base_bundle,
+    const std::string &lib_version_hint)
 {
    // Enable substitutions for user config bundle, throw an exception when loading a system profile.
    ConfigSubstitutionContext  substitution_context { compatibility_rule };
@@ -4969,7 +4994,7 @@ std::pair<PresetsConfigSubstitutions, size_t> PresetBundle::load_vendor_configs_
    // scans want a slice of one. Validation reads the JSONs whatever is cached.
    const boost::filesystem::path dir_path(dir);
    const bool cacheable = flags.has(LoadConfigBundleAttribute::LoadSystem) && ! flags.has(LoadConfigBundleAttribute::LoadFilamentOnly);
-    if (cacheable && ! validation_mode && this->load_vendor_cache(dir_path, vendor_name)) {
+    if (cacheable && ! validation_mode && this->load_vendor_cache(dir_path, vendor_name, lib_version_hint)) {
        size_t presets_loaded = 0;
        for (const PresetCollection* coll : std::initializer_list<const PresetCollection*>{
                 &this->prints, &this->sla_prints, &this->filaments, &this->sla_materials, &this->printers })
@@ -5550,7 +5575,8 @@ std::pair<PresetsConfigSubstitutions, size_t> PresetBundle::load_vendor_configs_
        const std::string version = vendor_profile.config_version.to_string();
        // The library is its own reference point; every other vendor's cache holds
        // filaments resolved against it, and is stamped with the version in effect.
-        const std::string lib_version = vendor_name == ORCA_FILAMENT_LIBRARY ? version : effective_lib_version(dir_path);
+        const std::string lib_version = vendor_name == ORCA_FILAMENT_LIBRARY ? version
+            : ! lib_version_hint.empty() ? lib_version_hint : effective_lib_version(dir_path);
        if (! lib_version.empty() &&
            ! this->save_vendor_cache((dir_path / (vendor_name + ".opc")).string(), vendor_name, version, lib_version))
            BOOST_LOG_TRIVIAL(warning) << "PresetBundle: failed to save vendor cache for " << vendor_name;
@@ -6218,21 +6244,26 @@ static bool cache_covers_version(const std::string& cached, const std::string& o
 // values — serialization_key_ordinal IS the config wire format). Any mismatch
 // means bytes written by another build could deserialize into the wrong
 // fields, so the cache is rejected wholesale before its body is read.
-std::string compute_cache_schema_fingerprint()
+const std::string& compute_cache_schema_fingerprint()
 {
-    std::string schema;
-    schema += SLIC3R_VERSION;
-    schema += ';';
-    for (const auto& [key, def] : print_config_def.options) {   // std::map => stable order
-        schema += key;
-        schema += '#'; schema += std::to_string(int(def.type));
-        schema += '@'; schema += std::to_string(def.serialization_key_ordinal);
-        for (const std::string& ev : def.enum_values) { schema += ','; schema += ev; }
+    // Constant for the lifetime of the process (print_config_def is immutable
+    // after static initialization), and asked for once per cache load and save.
+    static const std::string fingerprint = [] {
+        std::string schema;
+        schema += SLIC3R_VERSION;
        schema += ';';
-    }
-    boost::crc_32_type crc;
-    crc.process_bytes(schema.data(), schema.size());
-    return std::to_string(crc.checksum());
+        for (const auto& [key, def] : print_config_def.options) {   // std::map => stable order
+            schema += key;
+            schema += '#'; schema += std::to_string(int(def.type));
+            schema += '@'; schema += std::to_string(def.serialization_key_ordinal);
+            for (const std::string& ev : def.enum_values) { schema += ','; schema += ev; }
+            schema += ';';
+        }
+        boost::crc_32_type crc;
+        crc.process_bytes(schema.data(), schema.size());
+        return std::to_string(crc.checksum());
+    }();
+    return fingerprint;
 }

 } // anonymous namespace
@@ -6268,7 +6299,7 @@ bool PresetBundle::read_cache_blob(const std::string& path, std::string& out_blo
 }

 // static
-void PresetBundle::write_cache_blob(const std::string& path, const std::string& blob)
+bool PresetBundle::write_cache_blob(const std::string& path, const std::string& blob)
 {
    boost::crc_32_type crc;
    crc.process_bytes(blob.data(), blob.size());
@@ -6277,7 +6308,7 @@ void PresetBundle::write_cache_blob(const std::string& path, const std::string&
        boost::nowide::ofstream ofs(path, std::ios::binary | std::ios::trunc);
        if (!ofs.is_open()) {
            BOOST_LOG_TRIVIAL(warning) << "SystemPresetsCache: cannot open for writing: " << path;
-            return;
+            return false;
        }
        CacheFileHeader fhdr;
        fhdr.magic     = CACHE_MAGIC;
@@ -6286,8 +6317,13 @@ void PresetBundle::write_cache_blob(const std::string& path, const std::string&
        fhdr.crc32     = crc.checksum();
        ofs.write(reinterpret_cast<const char*>(&fhdr), sizeof(fhdr));
        ofs.write(blob.data(), static_cast<std::streamsize>(blob.size()));
+        ofs.close();   // flush; close() raises failbit on error
+        if (! ofs.good())
+            BOOST_LOG_TRIVIAL(warning) << "SystemPresetsCache: write failed (" << path << ")";
+        return ofs.good();
    } catch (const std::exception& e) {
        BOOST_LOG_TRIVIAL(warning) << "SystemPresetsCache: write failed (" << path << "): " << e.what();
+        return false;
    }
 }

@@ -6373,9 +6409,7 @@ bool PresetBundle::save_vendor_cache(const std::string& cache_path, const std::s
               this->obsolete_presets.printers);
            ar(this->m_errors);
        }
-        write_cache_blob(cache_path, body.str());
-        std::string verify;
-        return read_cache_blob(cache_path, verify);   // magic + size + CRC
+        return write_cache_blob(cache_path, body.str());
    } catch (const std::exception& e) {
        BOOST_LOG_TRIVIAL(warning) << "PresetBundle: failed to save vendor cache " << cache_path << ": " << e.what();
        return false;
@@ -6415,7 +6449,7 @@ std::string PresetBundle::peek_vendor_cache_version(const std::string& cache_pat
    }
 }

-bool PresetBundle::load_vendor_cache(const boost::filesystem::path& dir, const std::string& vendor_name)
+bool PresetBundle::load_vendor_cache(const boost::filesystem::path& dir, const std::string& vendor_name, const std::string& lib_version_hint)
 {
    // Whichever cache answers is judged against the vendor as installed in `dir`:
    // the profile there, or — with none, as when the cache is the whole of the
@@ -6425,7 +6459,7 @@ bool PresetBundle::load_vendor_cache(const boost::filesystem::path& dir, const s
    const boost::filesystem::path profile = dir / (vendor_name + ".json");
    const std::string version = boost::filesystem::exists(profile) ? get_vendor_cache_version(profile.string())
                                                                   : std::string(CACHE_ANY_VERSION);
-    const std::string lib_version = effective_lib_version(dir);
+    const std::string lib_version = ! lib_version_hint.empty() ? lib_version_hint : effective_lib_version(dir);
    const boost::filesystem::path rsrc = boost::filesystem::path(resources_dir()) / "profiles";
    return this->load_vendor_cache((dir / (vendor_name + ".opc")).string(), vendor_name, version, lib_version)
        || (dir != rsrc && this->load_vendor_cache((rsrc / (vendor_name + ".opc")).string(), vendor_name, version, lib_version));
@@ -6438,7 +6472,9 @@ bool PresetBundle::load_vendor_cache(const std::string& cache_path, const std::s
    if (! read_cache_blob(cache_path, blob))
        return false;
    try {
-        std::istringstream body(blob, std::ios::binary);
+        // Read in place: an istringstream would copy the blob (tens of MB for
+        // the largest vendors) once more just to stream over it.
+        boost::iostreams::stream<boost::iostreams::array_source> body(blob.data(), blob.size());
        cereal::BinaryInputArchive ar(body);
        uint32_t cache_version = 0;
        ar(cache_version);
@@ -6474,14 +6510,10 @@ bool PresetBundle::load_vendor_cache(const std::string& cache_path, const std::s
        this->m_config_maps.clear();
        this->m_filament_id_maps.clear();
        this->m_errors = 0;
-        // reset() does not clear m_printer_hold_alias, and a mid-body failure may
-        // have left collections it never reached (each load_collection clears its
-        // own collection's map only when it runs) with stale aliases.
-        this->prints.m_printer_hold_alias.clear();
-        this->sla_prints.m_printer_hold_alias.clear();
-        this->filaments.m_printer_hold_alias.clear();
-        this->sla_materials.m_printer_hold_alias.clear();
-        this->printers.m_printer_hold_alias.clear();
+        // A mid-body failure may have left collections the deserialization never
+        // reached (each load_collection clears its own collection's map only when
+        // it runs) with stale aliases.
+        this->clear_printer_hold_aliases();
        return false;
    }
 }
--- a/src/libslic3r/PresetBundle.hpp
+++ b/src/libslic3r/PresetBundle.hpp
@@ -14,6 +14,10 @@
 #include <boost/filesystem/path.hpp>
 #include <unordered_set>

+namespace cereal {
+	class BinaryInputArchive;
+	class BinaryOutputArchive;
+}

 #define DEFAULT_USER_FOLDER_NAME "default"
 #define BUNDLE_STRUCTURE_JSON_NAME "bundle_structure.json"
@@ -488,8 +492,11 @@ public:
    // not the profile JSONs are still there. A whole-vendor load comes from the
    // vendor's preset cache whenever one covers the profile on disk, and is parsed
    // from the JSONs (falling back to the ones in resources) only when none does.
+    // `lib_version_hint` is the filament library version in effect, when the caller
+    // loads many vendors and has already resolved it once; empty resolves it here.
    std::pair<PresetsConfigSubstitutions, size_t> load_vendor_configs_from_json(
-        const std::string &dir, const std::string &vendor_name, LoadConfigBundleAttributes flags, ForwardCompatibilitySubstitutionRule compatibility_rule, const PresetBundle* base_bundle = nullptr);
+        const std::string &dir, const std::string &vendor_name, LoadConfigBundleAttributes flags, ForwardCompatibilitySubstitutionRule compatibility_rule, const PresetBundle* base_bundle = nullptr,
+        const std::string &lib_version_hint = {});

    // Export a config bundle file containing all the presets and the names of the active presets.
    //void                        export_configbundle(const std::string &path, bool export_system_settings = false, bool export_physical_printers = false);
@@ -573,15 +580,17 @@ public:
 private:
    // Load one vendor from its preset cache: the one in `dir`, or — when that is
    // missing or stale — the one shipped in resources/profiles, both judged against
-    // the vendor as installed in `dir` and against the filament library in effect.
+    // the vendor as installed in `dir` and against the filament library in effect
+    // (resolved here unless the caller passes the already-resolved version).
    // False, with this bundle left clean, when neither is usable and the vendor has
    // to be parsed. This is how load_vendor_configs_from_json reads a cache.
-    bool load_vendor_cache(const boost::filesystem::path& dir, const std::string& vendor_name);
+    bool load_vendor_cache(const boost::filesystem::path& dir, const std::string& vendor_name, const std::string& lib_version_hint = {});

    // Read raw cache blob: verify magic, size, CRC.
    static bool read_cache_blob(const std::string& path, std::string& out_blob);
-    // Write a cache blob with the standard 20-byte file header.
-    static void write_cache_blob(const std::string& path, const std::string& blob);
+    // Write a cache blob with the standard 20-byte file header. False when the
+    // file could not be opened or written whole.
+    static bool write_cache_blob(const std::string& path, const std::string& blob);

    // (De)serialization of one collection's slice for the per-vendor cache:
    // every non-default, non-external preset (system or user) plus
@@ -589,6 +598,9 @@ private:
    static void save_collection(cereal::BinaryOutputArchive& ar, const PresetCollection& coll);
    static void load_collection(cereal::BinaryInputArchive& ar, PresetCollection& coll, const VendorMap& vendors);

+    // Clear every collection's m_printer_hold_alias, which reset() leaves alone.
+    void clear_printer_hold_aliases();
+
    // Whether to (re)write a per-vendor cache after a JSON parse.
    bool m_generate_vendor_caches { false };

@@ -642,6 +654,10 @@ extern bool is_vendor_installed(const std::string& vendor);
 // was stamped with where only the cache is installed. Invalid Semver if neither is.
 extern Semver installed_vendor_version(const std::string& vendor);

+// Remove every form `vendor` can be installed as from data_dir()/system: its
+// profile, its preset cache, and its preset directory.
+extern void remove_installed_vendor(const std::string& vendor);
+
 // The vendors `dir` holds, sorted: one is named by its profile or, in a build that
 // ships preset caches instead of the raw profile JSONs, by its cache alone.
 extern std::set<std::string> vendor_names_in(const boost::filesystem::path& dir);
--- a/src/slic3r/GUI/WebGuideDialog.cpp
+++ b/src/slic3r/GUI/WebGuideDialog.cpp
@@ -1,6 +1,7 @@
 #include "WebGuideDialog.hpp"
 #include "ConfigWizard.hpp"

+#include <boost/algorithm/string/join.hpp>
 #include <boost/filesystem/operations.hpp>
 #include <boost/nowide/fstream.hpp>
 #include <boost/filesystem/path.hpp>
@@ -190,8 +191,7 @@ GuideFrame::GuideFrame(GUI_App *pGUI, long style)

 GuideFrame::~GuideFrame()
 {
-    m_destroy = true;
-    *m_cancel_token = true; // signal any queued CallAfter lambdas before join
+    *m_cancel_token = true; // stop the loading thread and any queued CallAfter lambdas before join
    if (m_load_task && m_load_task->joinable())
        m_load_task->join();
    m_load_task.reset();
@@ -300,13 +300,19 @@ void GuideFrame::OnNavigationRequest(wxWebViewEvent &evt)
 /**
 * Callback invoked when a navigation request was accepted
 */
-void GuideFrame::init_guide_paths()
+// The empty shape every profile-loading path starts from or falls back to.
+void GuideFrame::reset_profile_json()
 {
-    m_ProfileJson             = json::parse("{}");
    m_ProfileJson["model"]    = json::array();
    m_ProfileJson["machine"]  = json::object();
    m_ProfileJson["filament"] = json::object();
    m_ProfileJson["process"]  = json::array();
+}
+
+void GuideFrame::init_guide_paths()
+{
+    m_ProfileJson = json::parse("{}");
+    reset_profile_json();

    vendor_dir      = (boost::filesystem::path(Slic3r::data_dir()) / PRESET_SYSTEM_DIR).make_preferred();
    rsrc_vendor_dir = (boost::filesystem::path(resources_dir()) / "profiles").make_preferred();
@@ -349,7 +355,7 @@ void GuideFrame::OnNavigationComplete(wxWebViewEvent &evt)
        try {
            init_guide_paths();
            if (BuildProfileDataFromPresetBundle()) {
-                if (!m_destroy)
+                if (!*m_cancel_token)
                    on_profile_loaded();
            } else {
                // Presets not yet in memory — delegate to background thread.
@@ -1184,11 +1190,7 @@ bool GuideFrame::BuildProfileJson(const PresetBundle& bundle, bool require_all_r
                    if (!nozzle_str.empty()) nozzle_str += ";";
                    nozzle_str += v.name;
                }
-                std::string materials_str;
-                for (const auto& m : model.default_materials) {
-                    if (!materials_str.empty()) materials_str += ";";
-                    materials_str += m;
-                }
+                const std::string materials_str = boost::algorithm::join(model.default_materials, ";");
                boost::filesystem::path cover_path =
                    (boost::filesystem::path(resources_dir()) / "profiles" / vp.id / (model.id + "_cover.png"))
                        .make_preferred();
@@ -1224,6 +1226,7 @@ bool GuideFrame::BuildProfileJson(const PresetBundle& bundle, bool require_all_r
        }

        // Filament map from system filament presets (vendor/type already resolved in config)
+        const json& machines = m_ProfileJson["machine"];
        for (const Preset& p : bundle.filaments()) {
            if (!p.is_system || !p.vendor) continue;
            const auto* fila_vendor     = p.config.option<ConfigOptionStrings>("filament_vendor");
@@ -1236,9 +1239,10 @@ bool GuideFrame::BuildProfileJson(const PresetBundle& bundle, bool require_all_r
            std::string model_list;
            if (compat_printers) {
                for (const std::string& pname : compat_printers->values) {
-                    if (m_ProfileJson["machine"].contains(pname)) {
-                        std::string m = m_ProfileJson["machine"][pname]["model"];
-                        std::string n = m_ProfileJson["machine"][pname]["nozzle"];
+                    auto it = machines.find(pname);
+                    if (it != machines.end()) {
+                        const std::string m = (*it)["model"];
+                        const std::string n = (*it)["nozzle"];
                        model_list += "[" + m + "++" + n + "]";
                    }
                }
@@ -1264,20 +1268,16 @@ bool GuideFrame::BuildProfileJson(const PresetBundle& bundle, bool require_all_r
        }

        if (require_all_resource_vendors) {
-            // If rsrc_vendor_dir has vendor JSONs not covered by the current bundle, the
+            // If rsrc_vendor_dir has vendors (profile JSONs, or the preset caches a
+            // packaged build ships instead) not covered by the current bundle, the
            // bundle is incomplete (e.g. dev env where data_dir/system only has
-            // OrcaFilamentLibrary+Custom). Fall back so LoadProfileFamily reads both dirs.
+            // OrcaFilamentLibrary+Custom). Fall back so the slow path reads both dirs.
            try {
-                for (const auto& e : boost::filesystem::directory_iterator(rsrc_vendor_dir)) {
-                    if (e.path().extension().string() != ".json") continue;
-                    const std::string stem = e.path().stem().string();
-                    if (bundle.vendors.find(stem) == bundle.vendors.end()) {
-                        BOOST_LOG_TRIVIAL(info) << "GuideFrame: vendor '" << stem
+                for (const std::string& name : vendor_names_in(rsrc_vendor_dir)) {
+                    if (bundle.vendors.find(name) == bundle.vendors.end()) {
+                        BOOST_LOG_TRIVIAL(info) << "GuideFrame: vendor '" << name
                            << "' in resources but not in preset_bundle — falling back to JSON loading";
-                        m_ProfileJson["model"]    = json::array();
-                        m_ProfileJson["machine"]  = json::object();
-                        m_ProfileJson["filament"] = json::object();
-                        m_ProfileJson["process"]  = json::array();
+                        reset_profile_json();
                        return false;
                    }
                }
@@ -1292,10 +1292,7 @@ bool GuideFrame::BuildProfileJson(const PresetBundle& bundle, bool require_all_r
    } catch (const std::exception& e) {
        BOOST_LOG_TRIVIAL(warning) << "GuideFrame::BuildProfileJson failed: " << e.what()
                                   << " — falling back to JSON loading";
-        m_ProfileJson["model"]    = json::array();
-        m_ProfileJson["machine"]  = json::object();
-        m_ProfileJson["filament"] = json::object();
-        m_ProfileJson["process"]  = json::array();
+        reset_profile_json();
        return false;
    }
 }
@@ -1340,7 +1337,7 @@ bool GuideFrame::BuildProfileDataFromVendors()
        if (vendor_files.count(filament_library))
            load_vendor(bundle, filament_library, nullptr);
        for (const auto& entry : vendor_files) {
-            if (m_destroy)
+            if (*m_cancel_token)
                return false;   // as in the scan below: a vendor without a cache is parsed, and that takes time
            const std::string& vendor = entry.first;
            // A cache is only ever written for a versioned vendor; a JSON has to be
@@ -1358,10 +1355,7 @@ bool GuideFrame::BuildProfileDataFromVendors()
        return BuildProfileJson(bundle, /*require_all_resource_vendors=*/false);
    } catch (const std::exception& e) {
        BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << " failed: " << e.what();
-        m_ProfileJson["model"]    = json::array();
-        m_ProfileJson["machine"]  = json::object();
-        m_ProfileJson["filament"] = json::object();
-        m_ProfileJson["process"]  = json::array();
+        reset_profile_json();
        return false;
    }
 }
@@ -1395,7 +1389,7 @@ int GuideFrame::LoadProfileData()
                    LoadProfileFamily(w2s(strVendor), iter->path().string());
                    loaded_vendors.insert(w2s(strVendor));
                }
-                if (m_destroy) return 0;
+                if (*m_cancel_token) return 0;
            }

            boost::filesystem::directory_iterator others_endIter;
@@ -1410,7 +1404,7 @@ int GuideFrame::LoadProfileData()
                    LoadProfileFamily(w2s(strVendor), iter->path().string());
                    loaded_vendors.insert(w2s(strVendor));
                }
-                if (m_destroy) return 0;
+                if (*m_cancel_token) return 0;
            }
        }

--- a/src/slic3r/GUI/WebGuideDialog.hpp
+++ b/src/slic3r/GUI/WebGuideDialog.hpp
@@ -87,6 +87,7 @@ public:
    bool BuildProfileJson(const PresetBundle& bundle, bool require_all_resource_vendors);
    bool BuildProfileDataFromPresetBundle();
    bool BuildProfileDataFromVendors();
+    void reset_profile_json();
    int SaveProfile();
    int GetFilamentInfo( std::string VendorDirectory,json & pFilaList, std::string filepath, std::string &sVendor, std::string &sType);

@@ -121,9 +122,9 @@ private:

    //First Load
    bool bFirstComplete{false};
-    std::atomic<bool> m_destroy{false};
-    // Shared cancel token captured by CallAfter lambdas so they don't touch
-    // `this` after the destructor has run and the object is freed.
+    // Set once in the destructor. Read through `this` by the loading thread
+    // (joined before `this` dies) and captured as the shared_ptr by CallAfter
+    // lambdas so they don't touch `this` after the object is freed.
    std::shared_ptr<std::atomic<bool>> m_cancel_token{std::make_shared<std::atomic<bool>>(false)};
    std::unique_ptr<boost::thread> m_load_task;

--- a/src/slic3r/Utils/PresetUpdater.cpp
+++ b/src/slic3r/Utils/PresetUpdater.cpp
@@ -1069,12 +1069,7 @@ void PresetUpdater::priv::check_installed_vendor_profiles() const
                }
                else {
                    //need to be removed because not installed
-                    const auto path_in_vendor = vendor_path / (vendor_name + ".json");
-                    fs::remove(path_in_vendor);
-                    fs::remove(vendor_path / (vendor_name + ".opc"));
-                    const auto path_of_vendor = vendor_path / vendor_name;
-                    if (fs::exists(path_of_vendor))
-                        fs::remove_all(path_of_vendor);
+                    remove_installed_vendor(vendor_name);
                }
            }
            else if (is_vendor_enabled) {
--- a/tests/libslic3r/test_vendor_cache.cpp
+++ b/tests/libslic3r/test_vendor_cache.cpp
@@ -54,6 +54,14 @@ std::string write_versionless_vendor_json(const fs::path& dir, const std::string
    return p.string();
 }

+// Whole file as bytes, for the byte-identity comparisons below.
+std::string slurp(const fs::path& p)
+{
+    std::string s;
+    load_string_file(p, s);
+    return s;
+}
+
 void corrupt_blob_byte(const std::string& path)
 {
    std::fstream f(path, std::ios::in | std::ios::out | std::ios::binary);
@@ -907,10 +915,6 @@ TEST_CASE("printer hold aliases survive a cache round-trip", "[VendorCache]")
    REQUIRE(loaded.load_vendor_cache(cache1.string(), vid, "1.0.0","1.0.0"));
    REQUIRE(save_one_vendor(loaded, cache2.string(), vid, "1.0.0"));

-    auto slurp = [](const fs::path& p) {
-        std::ifstream ifs(p.string(), std::ios::binary);
-        return std::string(std::istreambuf_iterator<char>(ifs), {});
-    };
    REQUIRE(slurp(cache1) == slurp(cache2));
 }

@@ -964,10 +968,6 @@ TEST_CASE("a loaded cache re-serializes to byte-identical output", "[VendorCache
    PresetBundle loaded;
    REQUIRE(loaded.load_vendor_cache(cache1.string(), "Acme", "1.0.0", "1.0.0"));
    REQUIRE(loaded.save_vendor_cache(cache2.string(), "Acme", "1.0.0", "1.0.0"));
-    auto slurp = [](const fs::path& p) {
-        std::ifstream ifs(p.string(), std::ios::binary);
-        return std::string(std::istreambuf_iterator<char>(ifs), {});
-    };
    REQUIRE(slurp(cache1) == slurp(cache2));
 }

@@ -1023,11 +1023,7 @@ TEST_CASE("a cache that fails mid-body deserialization is rejected and leaves th
    PresetBundle   clean;
    REQUIRE(out.save_vendor_cache(out_after.string(), vid, "1.0.0","1.0.0"));
    REQUIRE(clean.save_vendor_cache(clean_ref.string(), vid, "1.0.0","1.0.0"));
-    auto slurp2 = [](const fs::path& p) {
-        std::ifstream ifs(p.string(), std::ios::binary);
-        return std::string(std::istreambuf_iterator<char>(ifs), {});
-    };
-    CHECK(slurp2(out_after) == slurp2(clean_ref));
+    CHECK(slurp(out_after) == slurp(clean_ref));

    // The recovery must leave a bundle a caller can still load a good cache into.
    REQUIRE(out.load_vendor_cache(valid_cache.string(), vid, "1.0.0","1.0.0"));