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Public Member Functions | Public Attributes | List of all members
golos::application::detail::application_impl Class Reference
Inheritance diagram for golos::application::detail::application_impl:

Public Member Functions

uint8_t get_current_block_interval_in_seconds () const override
void reset_p2p_node (const fc::path &data_dir)
std::vector< fc::ip::endpoint > resolve_string_to_ip_endpoints (const std::string &endpoint_string)
void reset_websocket_server ()
void reset_websocket_tls_server ()
void on_connection (const fc::http::websocket_connection_ptr &c)
 application_impl (application *self)
 ~application_impl ()
void register_builtin_apis ()
void startup ()
optional< api_access_infoget_api_access_info (const string &username) const
void set_api_access_info (const string &username, api_access_info &&permissions)
void register_api_factory (const string &name, std::function< fc::api_ptr(const api_context &)> factory)
fc::api_ptr create_api_by_name (const api_context &ctx)
virtual bool has_item (const network::item_id &id) override
virtual bool handle_block (const network::block_message &blk_msg, bool sync_mode, std::vector< fc::uint160_t > &contained_transaction_message_ids) override
 allows the application to validate an item prior to broadcasting to peers. More...
virtual void handle_transaction (const network::trx_message &transaction_message) override
virtual void handle_message (const message &message_to_process) override
bool is_included_block (const block_id_type &block_id)
virtual std::vector< item_hash_t > get_block_ids (const std::vector< item_hash_t > &blockchain_synopsis, uint32_t &remaining_item_count, uint32_t limit) override
virtual message get_item (const item_id &id) override
virtual std::vector< item_hash_t > get_blockchain_synopsis (const item_hash_t &reference_point, uint32_t number_of_blocks_after_reference_point) override
virtual void sync_status (uint32_t item_type, uint32_t item_count) override
virtual void connection_count_changed (uint32_t c) override
virtual uint32_t get_block_number (const item_hash_t &block_id) override
virtual fc::time_point_sec get_block_time (const item_hash_t &block_id) override
virtual fc::time_point_sec get_blockchain_now () override
virtual item_hash_t get_head_block_id () const override
virtual uint32_t estimate_last_known_fork_from_git_revision_timestamp (uint32_t unix_timestamp) const override
virtual void error_encountered (const std::string &message, const fc::oexception &error) override
void get_max_block_age (int32_t &result)
void shutdown ()

Public Attributes

fc::optional< fc::temp_file > _lock_file
bool _is_block_producer = false
bool _force_validate = false
fc::path _data_dir
fc::path _shared_dir
const bpo::variables_map * _options = nullptr
api_access _apiaccess
std::shared_ptr< golos::chain::database_chain_db
std::shared_ptr< network::node > _p2p_network
std::shared_ptr< fc::http::websocket_server > _websocket_server
std::shared_ptr< fc::http::websocket_tls_server > _websocket_tls_server
std::map< string, std::shared_ptr< abstract_plugin > > _plugins_available
std::map< string, std::shared_ptr< abstract_plugin > > _plugins_enabled
flat_map< std::string, std::function< fc::api_ptr(const api_context &)> > _api_factories_by_name
std::vector< std::string > _public_apis
int32_t _max_block_age = -1
uint64_t _shared_file_size
bool _running
uint32_t allow_future_time = 5

Detailed Description

Definition at line 46 of file application.cpp.

Constructor & Destructor Documentation

◆ application_impl()

golos::application::detail::application_impl::application_impl ( application self)

Definition at line 193 of file application.cpp.

◆ ~application_impl()

golos::application::detail::application_impl::~application_impl ( )

Definition at line 199 of file application.cpp.

Member Function Documentation

◆ connection_count_changed()

virtual void golos::application::detail::application_impl::connection_count_changed ( uint32_t  c)

Call any time the number of connected peers changes.

Definition at line 753 of file application.cpp.

◆ create_api_by_name()

fc::api_ptr golos::application::detail::application_impl::create_api_by_name ( const api_context ctx)

Definition at line 352 of file application.cpp.

◆ error_encountered()

virtual void golos::application::detail::application_impl::error_encountered ( const std::string &  message,
const fc::oexception &  error 

Definition at line 790 of file application.cpp.

◆ estimate_last_known_fork_from_git_revision_timestamp()

virtual uint32_t golos::application::detail::application_impl::estimate_last_known_fork_from_git_revision_timestamp ( uint32_t  unix_timestamp) const

Definition at line 786 of file application.cpp.

◆ get_api_access_info()

optional<api_access_info> golos::application::detail::application_impl::get_api_access_info ( const string &  username) const

Definition at line 332 of file application.cpp.

◆ get_block_ids()

virtual std::vector<item_hash_t> golos::application::detail::application_impl::get_block_ids ( const std::vector< item_hash_t > &  blockchain_synopsis,
uint32_t &  remaining_item_count,
uint32_t  limit 

Assuming all data elements are ordered in some way, this method should return up to limit ids that occur after the last ID in synopsis that we recognize.

On return, remaining_item_count will be set to the number of items in our blockchain after the last item returned in the result, or 0 if the result contains the last item in the blockchain

Definition at line 486 of file application.cpp.

◆ get_block_number()

virtual uint32_t golos::application::detail::application_impl::get_block_number ( const item_hash_t &  block_id)

Definition at line 757 of file application.cpp.

◆ get_block_time()

virtual fc::time_point_sec golos::application::detail::application_impl::get_block_time ( const item_hash_t &  block_id)

Returns the time a block was produced (if block_id = 0, returns genesis time). If we don't know about the block, returns time_point_sec::min()

Definition at line 767 of file application.cpp.

◆ get_blockchain_now()

virtual fc::time_point_sec golos::application::detail::application_impl::get_blockchain_now ( )

returns fc::time_point::now()

Definition at line 778 of file application.cpp.

◆ get_blockchain_synopsis()

virtual std::vector<item_hash_t> golos::application::detail::application_impl::get_blockchain_synopsis ( const item_hash_t &  reference_point,
uint32_t  number_of_blocks_after_reference_point 

Returns a synopsis of the blockchain used for syncing. This consists of a list of block hashes at intervals exponentially increasing towards the genesis block. When syncing to a peer, the peer uses this data to determine if we're on the same fork as they are, and if not, what blocks they need to send us to get us on their fork.

In the over-simplified case, this is a straighforward synopsis of our current preferred blockchain; when we first connect up to a peer, this is what we will be sending. It looks like this: If the blockchain is empty, it will return the empty list. If the blockchain has one block, it will return a list containing just that block. If it contains more than one block: the first element in the list will be the hash of the highest numbered block that we cannot undo the second element will be the hash of an item at the half way point in the undoable segment of the blockchain the third will be ~3/4 of the way through the undoable segment of the block chain the fourth will be at ~7/8... &c. the last item in the list will be the hash of the most recent block on our preferred chain so if the blockchain had 26 blocks labeled a - z, the synopsis would be: a n u x z the idea being that by sending a small (<30) number of block ids, we can summarize a huge blockchain. The block ids are more dense near the end of the chain where because we are more likely to be almost in sync when we first connect, and forks are likely to be short. If the peer we're syncing with in our example is on a fork that started at block 'v', then they will reply to our synopsis with a list of all blocks starting from block 'u', the last block they know that we had in common.

In the real code, there are several complications.

First, as an optimization, we don't usually send a synopsis of the entire blockchain, we send a synopsis of only the segment of the blockchain that we have undo data for. If their fork doesn't build off of something in our undo history, we would be unable to switch, so there's no reason to fetch the blocks.

Second, when a peer replies to our initial synopsis and gives us a list of the blocks they think we are missing, they only send a chunk of a few thousand blocks at once. After we get those block ids, we need to request more blocks by sending another synopsis (we can't just say "send me the next 2000 ids" because they may have switched forks themselves and they don't track what they've sent us). For faster performance, we want to get a fairly long list of block ids first, then start downloading the blocks. The peer doesn't handle these follow-up block id requests any different from the initial request; it treats the synopsis we send as our blockchain and bases its response entirely off that. So to get the response we want (the next chunk of block ids following the last one they sent us, or, failing that, the shortest fork off of the last list of block ids they sent), we need to construct a synopsis as if our blockchain was made up of:

  1. the blocks in our block chain up to the fork point (if there is a fork) or the head block (if no fork)
  2. the blocks we've already pushed from their fork (if there's a fork)
  3. the block ids they've previously sent us Segment 3 is handled in the p2p code, it just tells us the number of blocks it has (in number_of_blocks_after_reference_point) so we can leave space in the synopsis for them. We're responsible for constructing the synopsis of Segments 1 and 2 from our active blockchain and fork database. The reference_point parameter is the last block from that peer that has been successfully pushed to the blockchain, so that tells us whether the peer is on a fork or on the main chain.

Definition at line 618 of file application.cpp.

◆ get_current_block_interval_in_seconds()

uint8_t golos::application::detail::application_impl::get_current_block_interval_in_seconds ( ) const

Definition at line 52 of file application.cpp.

◆ get_head_block_id()

virtual item_hash_t golos::application::detail::application_impl::get_head_block_id ( ) const

Definition at line 782 of file application.cpp.

◆ get_item()

virtual message golos::application::detail::application_impl::get_item ( const item_id &  id)

Given the hash of the requested data, fetch the body.

Definition at line 544 of file application.cpp.

◆ get_max_block_age()

void golos::application::detail::application_impl::get_max_block_age ( int32_t &  result)

Definition at line 794 of file application.cpp.

◆ handle_block()

virtual bool golos::application::detail::application_impl::handle_block ( const network::block_message &  blk_msg,
bool  sync_mode,
std::vector< fc::uint160_t > &  contained_transaction_message_ids 

allows the application to validate an item prior to broadcasting to peers.

sync_modetrue if the message was fetched through the sync process, false during normal operation
true if this message caused the blockchain to switch forks, false if it did not
exceptionif error validating the item, otherwise the item is safe to broadcast on.

Definition at line 388 of file application.cpp.

◆ handle_message()

virtual void golos::application::detail::application_impl::handle_message ( const message &  message_to_process)

Definition at line 466 of file application.cpp.

◆ handle_transaction()

virtual void golos::application::detail::application_impl::handle_transaction ( const network::trx_message &  transaction_message)

Definition at line 458 of file application.cpp.

◆ has_item()

virtual bool golos::application::detail::application_impl::has_item ( const network::item_id &  id)

If delegate has the item, the network has no need to fetch it.

Definition at line 364 of file application.cpp.

◆ is_included_block()

bool golos::application::detail::application_impl::is_included_block ( const block_id_type &  block_id)

Definition at line 471 of file application.cpp.

◆ on_connection()

void golos::application::detail::application_impl::on_connection ( const fc::http::websocket_connection_ptr &  c)

Definition at line 176 of file application.cpp.

◆ register_api_factory()

void golos::application::detail::application_impl::register_api_factory ( const string &  name,
std::function< fc::api_ptr(const api_context &)>  factory 

Definition at line 348 of file application.cpp.

◆ register_builtin_apis()

void golos::application::detail::application_impl::register_builtin_apis ( )

Definition at line 202 of file application.cpp.

◆ reset_p2p_node()

void golos::application::detail::application_impl::reset_p2p_node ( const fc::path &  data_dir)

Definition at line 56 of file application.cpp.

◆ reset_websocket_server()

void golos::application::detail::application_impl::reset_websocket_server ( )

Definition at line 132 of file application.cpp.

◆ reset_websocket_tls_server()

void golos::application::detail::application_impl::reset_websocket_tls_server ( )

Definition at line 151 of file application.cpp.

◆ resolve_string_to_ip_endpoints()

std::vector<fc::ip::endpoint> golos::application::detail::application_impl::resolve_string_to_ip_endpoints ( const std::string &  endpoint_string)

Definition at line 108 of file application.cpp.

◆ set_api_access_info()

void golos::application::detail::application_impl::set_api_access_info ( const string &  username,
api_access_info &&  permissions 

Definition at line 344 of file application.cpp.

◆ shutdown()

void golos::application::detail::application_impl::shutdown ( )

Definition at line 799 of file application.cpp.

◆ startup()

void golos::application::detail::application_impl::startup ( )

Definition at line 209 of file application.cpp.

◆ sync_status()

virtual void golos::application::detail::application_impl::sync_status ( uint32_t  item_type,
uint32_t  item_count 

Call this after the call to handle_message succeeds.

item_typethe type of the item we're synchronizing, will be the same as item passed to the sync_from() call
item_countthe number of items known to the node that haven't been sent to handle_item() yet. After item_count more calls to handle_item(), the node will be in sync

Definition at line 746 of file application.cpp.

Member Data Documentation

◆ _api_factories_by_name

flat_map<std::string, std::function<fc::api_ptr(const api_context &)> > golos::application::detail::application_impl::_api_factories_by_name

Definition at line 826 of file application.cpp.

◆ _apiaccess

api_access golos::application::detail::application_impl::_apiaccess

Definition at line 816 of file application.cpp.

◆ _chain_db

std::shared_ptr<golos::chain::database> golos::application::detail::application_impl::_chain_db

Definition at line 819 of file application.cpp.

◆ _data_dir

fc::path golos::application::detail::application_impl::_data_dir

Definition at line 813 of file application.cpp.

◆ _force_validate

bool golos::application::detail::application_impl::_force_validate = false

Definition at line 50 of file application.cpp.

◆ _is_block_producer

bool golos::application::detail::application_impl::_is_block_producer = false

Definition at line 49 of file application.cpp.

◆ _lock_file

fc::optional<fc::temp_file> golos::application::detail::application_impl::_lock_file

Definition at line 48 of file application.cpp.

◆ _max_block_age

int32_t golos::application::detail::application_impl::_max_block_age = -1

Definition at line 828 of file application.cpp.

◆ _options

const bpo::variables_map* golos::application::detail::application_impl::_options = nullptr

Definition at line 815 of file application.cpp.

◆ _p2p_network

std::shared_ptr<network::node> golos::application::detail::application_impl::_p2p_network

Definition at line 820 of file application.cpp.

◆ _plugins_available

std::map<string, std::shared_ptr<abstract_plugin> > golos::application::detail::application_impl::_plugins_available

Definition at line 824 of file application.cpp.

◆ _plugins_enabled

std::map<string, std::shared_ptr<abstract_plugin> > golos::application::detail::application_impl::_plugins_enabled

Definition at line 825 of file application.cpp.

◆ _public_apis

std::vector<std::string> golos::application::detail::application_impl::_public_apis

Definition at line 827 of file application.cpp.

◆ _running

bool golos::application::detail::application_impl::_running

Definition at line 831 of file application.cpp.

◆ _self

application* golos::application::detail::application_impl::_self

Definition at line 811 of file application.cpp.

◆ _shared_dir

fc::path golos::application::detail::application_impl::_shared_dir

Definition at line 814 of file application.cpp.

◆ _shared_file_size

uint64_t golos::application::detail::application_impl::_shared_file_size

Definition at line 829 of file application.cpp.

◆ _websocket_server

std::shared_ptr<fc::http::websocket_server> golos::application::detail::application_impl::_websocket_server

Definition at line 821 of file application.cpp.

◆ _websocket_tls_server

std::shared_ptr<fc::http::websocket_tls_server> golos::application::detail::application_impl::_websocket_tls_server

Definition at line 822 of file application.cpp.

◆ allow_future_time

uint32_t golos::application::detail::application_impl::allow_future_time = 5

Definition at line 833 of file application.cpp.

The documentation for this class was generated from the following file: