Better

src/Disks/ReadIndirectBufferFromWebServer.cpp

@@ -37,10 +37,10 @@ std::unique_ptr<ReadBuffer> ReadIndirectBufferFromWebServer::initialize()
 {
     Poco::URI uri(url);
 
-    ReadWriteBufferFromHTTP::HTTPHeaderEntries headers;
-    headers.emplace_back(std::make_pair("Range", fmt::format("bytes={}-", offset)));
-    const auto & settings = context->getSettingsRef();
+    read_settings.http_start_offset = offset;
     LOG_DEBUG(log, "Reading from offset: {}", offset);
+
+    const auto & settings = context->getSettingsRef();
     const auto & config = context->getConfigRef();
     Poco::Timespan http_keep_alive_timeout{config.getUInt("keep_alive_timeout", 20), 0};
 
@@ -56,8 +56,7 @@ std::unique_ptr<ReadBuffer> ReadIndirectBufferFromWebServer::initialize()
         0,
         Poco::Net::HTTPBasicCredentials{},
         buf_size,
-        read_settings,
-        headers);
+        read_settings);
 }
 
 

src/IO/ReadSettings.h

@@ -72,6 +72,7 @@ struct ReadSettings
     size_t http_max_tries = 1;
     size_t http_retry_initial_backoff_ms = 100;
     size_t http_retry_max_backoff_ms = 10000;
+    size_t http_start_offset = 0;
 
     ReadSettings adjustBufferSize(size_t file_size) const
     {

src/IO/ReadWriteBufferFromHTTP.h

@@ -20,7 +20,6 @@
 #include <Common/RemoteHostFilter.h>
 #include <base/logger_useful.h>
 #include <Poco/URIStreamFactory.h>
-#include <charconv>
 
 #if !defined(ARCADIA_BUILD)
 #    include <Common/config.h>
@@ -108,15 +107,16 @@ namespace detail
         std::function<void(size_t)> next_callback;
 
         size_t buffer_size;
-
         size_t bytes_read = 0;
+        /// Read from offset with range header if needed.
         size_t start_byte = 0;
 
-        bool with_partial_content = false;
+        /// Non-empty if content-length header was received.
         std::optional<size_t> total_bytes_to_read;
 
-        /// Delayed exception in case retries with partial content are not satisfiable
-        std::optional<Poco::Exception> exception;
+        /// Delayed exception in case retries with partial content are not satisfiable.
+        std::exception_ptr exception;
+
         ReadSettings settings;
         Poco::Logger * log;
 
@@ -137,7 +137,8 @@ namespace detail
                 request.set(std::get<0>(http_header_entry), std::get<1>(http_header_entry));
             }
 
-            if (bytes_read && with_partial_content)
+            bool with_partial_content = bytes_read && total_bytes_to_read;
+            if (with_partial_content)
                 request.set("Range", fmt::format("bytes={}-", start_byte + bytes_read));
 
             if (!credentials.getUsername().empty())
@@ -159,9 +160,9 @@ namespace detail
 
                 if (with_partial_content && response.getStatus() != Poco::Net::HTTPResponse::HTTPStatus::HTTP_PARTIAL_CONTENT)
                 {
-                    /// If we retries some request, throw error from that request.
+                    /// If we retried some request, throw error from that request.
                     if (exception)
-                        exception->rethrow();
+                        std::rethrow_exception(exception);
                     throw Exception(ErrorCodes::HTTP_RANGE_NOT_SATISFIABLE, "Cannot read with range: {}", request.get("Range"));
                 }
 
@@ -200,36 +201,15 @@ namespace detail
             , http_header_entries {http_header_entries_}
             , remote_host_filter {remote_host_filter_}
             , buffer_size {buffer_size_}
+            , start_byte {settings_.http_start_offset}
             , settings {settings_}
             , log(&Poco::Logger::get("ReadWriteBufferFromHTTP"))
         {
-            /**
-             *  Get first byte from `bytes=offset-`, `bytes=offset-end`.
-             *  Now there are two places, where it can be set: 1. in DiskWeb (offset), 2. via config as part of named-collection.
-             *  Other cases not supported.
-             */
-            auto range_header = std::find_if(http_header_entries_.begin(), http_header_entries_.end(),
-                [&](const HTTPHeaderEntry & header) { return std::get<0>(header) == "Range"; });
-            if (range_header != http_header_entries_.end())
-            {
-                if (method != Poco::Net::HTTPRequest::HTTP_GET)
-                    throw Exception(ErrorCodes::BAD_ARGUMENTS, "Headers are allowed only with GET request");
-                auto range = std::get<1>(*range_header).substr(std::strlen("bytes="));
-                UInt64 start;
-                auto parsed = tryParse<UInt64>(start, range);
-                if (parsed)
-                    start_byte = start;
-                else
-                    throw Exception(ErrorCodes::BAD_ARGUMENTS, "Cannot extract start byte");
-            }
-
-
             initialize();
         }
 
         void initialize()
         {
-
             Poco::Net::HTTPResponse response;
             istr = call(uri, response);
 
@@ -244,14 +224,8 @@ namespace detail
             }
 
             /// If it is the very first initialization.
-            if (!bytes_read && !total_bytes_to_read)
-            {
-                /// If we do not know total size, disable retries in the middle of reading.
-                if (response.hasContentLength())
-                    total_bytes_to_read = response.getContentLength();
-                else
-                    with_partial_content = false;
-            }
+            if (!bytes_read && !total_bytes_to_read && response.hasContentLength())
+                total_bytes_to_read = response.getContentLength();
 
             try
             {
@@ -298,15 +272,14 @@ namespace detail
                     }
                     catch (const Poco::Exception & e)
                     {
-                        if (bytes_read && !with_partial_content)
+                        bool can_retry_request = !bytes_read || total_bytes_to_read.has_value();
+                        if (!can_retry_request)
                             throw;
 
                         LOG_ERROR(&Poco::Logger::get("ReadBufferFromHTTP"), "Error: {}, code: {}", e.what(), e.code());
+
+                        exception = std::current_exception();
                         impl.reset();
-
-                        exception.reset();
-                        exception.emplace(e);
-
                         sleepForMilliseconds(milliseconds_to_wait);
                         milliseconds_to_wait *= 2;
                     }
@@ -315,7 +288,7 @@ namespace detail
             }
 
             if (!successful_read && exception)
-                exception->rethrow();
+                std::rethrow_exception(exception);
 
             if (!result)
                 return false;

src/Storages/StorageURL.cpp

@@ -450,6 +450,8 @@ void registerStorageURL(StorageFactory & factory)
         for (const auto & [header, value] : configuration.headers)
         {
             auto value_literal = value.safeGet<String>();
+            if (header == "Range")
+                throw Exception(ErrorCodes::BAD_ARGUMENTS, "Range headers are not allowed");
             headers.emplace_back(std::make_pair(header, value_literal));
         }