[lldb] [llvm] Added settings for DEBUGINFOD cache location and timeout (PR #78605)

[Kevin Frei via llvm-commits]

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@@ -112,31 +142,49 @@ SymbolLocator *SymbolLocatorDebuginfod::CreateInstance() {
   return new SymbolLocatorDebuginfod();
 }
 
-static std::optional<FileSpec> GetFileForModule(
-    const ModuleSpec &module_spec,
-    std::function<llvm::Expected<std::string>(llvm::object::BuildIDRef)>
-        PullFromServer) {
-  if (!ModuleList::GetGlobalModuleListProperties().GetEnableExternalLookup())
-    return {};
++ static std::optional<FileSpec> +
+    GetFileForModule(
+        const ModuleSpec &module_spec,
+        std::function<std::string(llvm::object::BuildID)> UrlBuilder) {
   const UUID &module_uuid = module_spec.GetUUID();
-  if (module_uuid.IsValid() && llvm::canUseDebuginfod()) {
-    llvm::object::BuildID build_id(module_uuid.GetBytes());
-    llvm::Expected<std::string> result = PullFromServer(build_id);
-    if (result)
-      return FileSpec(*result);
-    // An error here should be logged as a failure in the Debuginfod library,
-    // so just consume it here
-    consumeError(result.takeError());
-  }
+  // Don't bother if we don't have a valid UUID, Debuginfod isn't available,
+  // or if the 'symbols.enable-external-lookup' setting is false
+  if (!module_uuid.IsValid() || !llvm::canUseDebuginfod() ||
+      !ModuleList::GetGlobalModuleListProperties().GetEnableExternalLookup())
+    return {};
+
+  // Grab the settings values we need
+  PluginProperties &plugin_props = GetGlobalPluginProperties();
+  llvm::Expected<llvm::StringRef> CacheDirectoryPathOrErr =
+      plugin_props.GetCachePath();
+  // A cache location is *required*
+  if (!CacheDirectoryPathOrErr)
+    return {};
+  llvm::StringRef CacheDirectoryPath = *CacheDirectoryPathOrErr;
+  llvm::SmallVector<llvm::StringRef> DebuginfodUrls =
+      llvm::getDefaultDebuginfodUrls();
+  std::chrono::milliseconds Timeout = plugin_props.GetTimeout();
+
+  // We're ready to ask the Debuginfod library to find our file
+  llvm::object::BuildID build_id(module_uuid.GetBytes());
+  std::string UrlPath = UrlBuilder(build_id);
+  std::string CacheKey = llvm::getDebuginfodCacheKey(UrlPath);
+  llvm::Expected<std::string> result = llvm::getCachedOrDownloadArtifact(
+      CacheKey, UrlPath, CacheDirectoryPath, DebuginfodUrls, Timeout);
+  if (result)
+    return FileSpec(*result);
+  // An error here should be logged as a failure in the Debuginfod library,
+  // just consume it here
+  consumeError(result.takeError());
----------------
kevinfrei wrote:

LLDB_LOGV (LLDBLog::Symbols context) seems like the right choice, given how noisy it will be.

https://github.com/llvm/llvm-project/pull/78605