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sockets.h
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sockets.h
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////////////////////////////////////////////////////////////////////////////////
// MIT License //
// //
// Copyright (c) 2024 Erich Erstu //
// //
// Permission is hereby granted, free of charge, to any person obtaining a //
// copy of this software and associated documentation files (the "Software"), //
// to deal in the Software without restriction, including without limitation //
// the rights to use, copy, modify, merge, publish, distribute, sublicense, //
// and/or sell copies of the Software, and to permit persons to whom the //
// Software is furnished to do so, subject to the following conditions: //
// //
// The above copyright notice and this permission notice shall be included in //
// all copies or substantial portions of the Software. //
// //
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR //
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, //
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL //
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER //
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING //
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER //
// DEALINGS IN THE SOFTWARE. //
////////////////////////////////////////////////////////////////////////////////
#ifndef SOCKETS_H_05_01_2023
#define SOCKETS_H_05_01_2023
#include <algorithm>
#include <limits>
#include <csignal>
#include <cstring>
#include <cstdarg>
#include <cerrno>
#include <cstdio>
#include <cstdint>
#include <sys/epoll.h>
#include <netdb.h>
#include <unistd.h>
class SOCKETS final {
public:
static constexpr const char *const VERSION = "1.04";
enum class ERROR : uint8_t {
NONE = 0,
BAD_TIMING, // Try again later.
PENDING_ALERT, // Handle all the pending alerts and try again.
OUT_OF_MEMORY, // Free some memory and then try again.
RES_LIMIT_MET, // System lacks resources to complete a task.
LIBRARY, // There is a bug in this library.
BAD_REQUEST, // There is a bug in the caller's application.
SYSTEM, // Standard Library's system call failed with an error.
UNKNOWN // Standard Library call failed for an unknown reason.
};
static constexpr const ERROR
NO_ERROR = ERROR::NONE,
BAD_TIMING = ERROR::BAD_TIMING,
PENDING_ALERT = ERROR::PENDING_ALERT,
OUT_OF_MEMORY = ERROR::OUT_OF_MEMORY,
RES_LIMIT_MET = ERROR::RES_LIMIT_MET,
LIBRARY_ERROR = ERROR::LIBRARY,
BAD_REQUEST = ERROR::BAD_REQUEST,
SYSTEM_ERROR = ERROR::SYSTEM,
UNKNOWN_ERROR = ERROR::UNKNOWN;
static constexpr const char *to_string(ERROR) noexcept;
struct SESSION {
size_t id;
ERROR error;
bool valid:1;
};
enum class EVENT : uint8_t {
NONE = 0,
// Do not change the order of the events above this line.
READ,
WRITE,
ACCEPT,
CONNECTION,
DISCONNECTION,
CLOSE,
INCOMING,
// Do not change the order of the events below this line.
EPOLL,
MAX_EVENTS
};
static constexpr const EVENT
NO_EVENT = EVENT::NONE,
CONNECTION = EVENT::CONNECTION,
DISCONNECTION = EVENT::DISCONNECTION,
INCOMING = EVENT::INCOMING;
struct ALERT {
size_t session;
EVENT event;
bool valid:1;
};
struct RESULT{
int value;
int code;
const char *text;
const char *call;
const char *file;
int line;
ERROR error;
};
SOCKETS() noexcept;
~SOCKETS();
bool init() noexcept;
bool deinit() noexcept;
void set_logger(void (*callback)(SESSION, const char *) noexcept) noexcept;
void set_memcap(size_t bytes) noexcept;
ERROR set_intake(
size_t session_id, size_t bytes,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
size_t get_memcap() const noexcept;
size_t get_memtop() const noexcept;
SESSION listen(
const char *port, int family =AF_UNSPEC,
const std::initializer_list<int> options ={SO_REUSEADDR}, int flags =0
) noexcept;
SESSION connect(
const char *host, const char *port, int family =AF_UNSPEC
) noexcept;
[[nodiscard]] bool idle() const noexcept;
ERROR next_error(int timeout_milliseconds =-1) noexcept;
ERROR last_error() noexcept;
ALERT next_alert() noexcept;
[[nodiscard]] size_t get_incoming_size(size_t session_id) const noexcept;
[[nodiscard]] size_t get_outgoing_size(size_t session_id) const noexcept;
size_t read(size_t session_id, void *buf, size_t count) noexcept;
const char *read(size_t session_id) noexcept;
const char *peek(size_t session_id) noexcept;
ERROR write(size_t session_id, const void *buf, size_t count) noexcept;
ERROR write(size_t session_id, const char *text) noexcept;
ERROR writef(
size_t session_id, const char *fmt, ...
) noexcept __attribute__((format(printf, 3, 4)));
[[nodiscard]] bool is_listener(size_t session_id) const noexcept;
[[nodiscard]] bool is_frozen(size_t session_id) const noexcept;
[[nodiscard]] SESSION get_listener(size_t session_id) const noexcept;
[[nodiscard]] const char *get_host(size_t session_id) const noexcept;
[[nodiscard]] const char *get_port(size_t session_id) const noexcept;
[[nodiscard]] SESSION get_session(int descriptor) const noexcept;
void freeze(size_t session_id) noexcept;
void unfreeze(size_t session_id) noexcept;
void disconnect(size_t session_id) noexcept;
static constexpr const size_t BITS_PER_BYTE{
std::numeric_limits<unsigned char>::digits
};
private:
enum class BUFFER : uint8_t {
NEXT_ERROR,
// Do not change the order of items below this line.
MAX_BUFFERS
};
struct MEMORY {
size_t size;
void *data;
MEMORY *next;
MEMORY *prev;
bool indexed:1;
bool recycled:1;
};
struct KEY {
uintptr_t value;
};
struct PIPE {
enum class TYPE : uint8_t {
NONE = 0,
UINT8,
UINT64,
INT,
PTR,
JACK_PTR,
MEMORY_PTR,
KEY,
EPOLL_EVENT
};
struct ENTRY {
union {
uint8_t as_uint8;
uint64_t as_uint64;
int as_int;
void *as_ptr;
KEY as_key;
epoll_event as_epoll_event;
};
TYPE type;
};
size_t capacity;
size_t size;
void *data;
TYPE type;
MEMORY *memory;
};
struct INDEX {
enum class TYPE : uint8_t {
NONE = 0,
// Do not change the order of the types above this line.
EVENT_DESCRIPTOR,
DESCRIPTOR_JACK,
SESSION_JACK,
RESOURCE_MEMORY,
// Do not change the order of the types below this line.
MAX_TYPES
};
struct ENTRY {
PIPE *key_pipe;
PIPE *val_pipe;
size_t index;
ERROR error;
bool valid:1;
};
size_t buckets;
size_t entries;
struct TABLE {
PIPE key;
PIPE value;
} *table;
TYPE type;
bool multimap:1;
bool autogrow:1;
};
struct JACK {
size_t id;
size_t intake;
unsigned event_lookup[ static_cast<size_t>(EVENT::MAX_EVENTS) ];
PIPE epoll_ev;
PIPE children;
PIPE incoming;
PIPE outgoing;
PIPE host;
PIPE port;
int descriptor;
struct PARENT {
int descriptor;
int child_index;
} parent;
int ai_family;
int ai_flags;
struct addrinfo *blacklist;
struct BITSET {
bool frozen:1;
bool connecting:1;
bool may_shutdown:1;
bool reconnect:1;
bool listener:1;
} bitset;
};
struct QUERY {
enum class TYPE : uint8_t {
DESCRIPTOR,
SESSION,
EVENT
};
union {
int descriptor;
size_t session;
EVENT event;
};
TYPE type;
};
static constexpr KEY make_key(uintptr_t) noexcept;
static constexpr KEY make_key(EVENT) noexcept;
static constexpr struct JACK make_jack(
int descriptor, int parent =-1
) noexcept;
static constexpr struct ALERT make_alert(
size_t session, EVENT type, bool valid =true
) noexcept;
static constexpr struct SESSION make_session(ERROR) noexcept;
static constexpr struct SESSION make_session(
size_t id, ERROR error =ERROR::NONE, bool valid =true
) noexcept;
static constexpr struct INDEX::ENTRY make_index_entry(
PIPE &keys, PIPE &values, size_t index, ERROR, bool valid
) noexcept;
static constexpr struct INDEX::ENTRY make_index_entry(
PIPE &keys, PIPE &values, size_t index, ERROR
) noexcept;
static constexpr PIPE make_pipe(
const uint8_t *data, size_t size
) noexcept;
static constexpr PIPE make_pipe(PIPE::TYPE) noexcept;
static constexpr PIPE::ENTRY make_pipe_entry(PIPE::TYPE) noexcept;
static constexpr PIPE::ENTRY make_pipe_entry(uint64_t ) noexcept;
static constexpr PIPE::ENTRY make_pipe_entry(int ) noexcept;
static constexpr PIPE::ENTRY make_pipe_entry(KEY ) noexcept;
static constexpr PIPE::ENTRY make_pipe_entry(JACK * ) noexcept;
static constexpr PIPE::ENTRY make_pipe_entry(MEMORY * ) noexcept;
static constexpr epoll_data_t make_epoll_data(int fd) noexcept;
static constexpr epoll_event make_epoll_event(
int descriptor, uint32_t events
) noexcept;
static constexpr struct addrinfo make_addrinfo(
int ai_family, int ai_flags
) noexcept;
static constexpr QUERY make_descriptor_query(int) noexcept;
static constexpr QUERY make_session_query(size_t) noexcept;
static constexpr QUERY make_session_query(SESSION) noexcept;
static constexpr QUERY make_event_query(EVENT) noexcept;
static bool is_listed(
const addrinfo &info, const addrinfo *list
) noexcept;
static constexpr bool is_descriptor(int) noexcept;
static constexpr EVENT next(EVENT) noexcept;
static constexpr size_t size(PIPE::TYPE) noexcept;
static constexpr size_t align(PIPE::TYPE) noexcept;
static constexpr auto fmt_bytes(size_t) noexcept;
static constexpr const char *LEAF(const char *path) noexcept;
static constexpr const char *TAIL(const char *, char neck) noexcept;
static int clz(unsigned int) noexcept;
static int clz(unsigned long) noexcept;
static int clz(unsigned long long) noexcept;
static unsigned int next_pow2(unsigned int) noexcept;
static unsigned long next_pow2(unsigned long) noexcept;
static unsigned long long next_pow2(unsigned long long) noexcept;
ERROR handle_close (JACK &) noexcept;
ERROR handle_epoll (JACK &, int timeout) noexcept;
ERROR handle_read (JACK &) noexcept;
ERROR handle_write (JACK &) noexcept;
ERROR handle_accept(JACK &) noexcept;
SESSION connect(
const char *host, const char *port, int family, int flags,
JACK *predecessor =nullptr,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
SESSION listen(
const char *host, const char *port, int family, int flags,
const std::initializer_list<int> options, JACK *predecessor =nullptr,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
void terminate(
int descriptor,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
size_t next_connection() noexcept;
size_t next_disconnection() noexcept;
size_t next_incoming() noexcept;
SESSION create_epoll() noexcept;
ERROR operate_epoll(int operation, epoll_event event) noexcept;
ERROR bind_to_epoll(
int descriptor,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
ERROR modify_epoll(
int descriptor, uint32_t events,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
ERROR block_signals(sigset_t &sigset_orig) noexcept;
ERROR unblock_signals(sigset_t &sigset_orig) noexcept;
SESSION open_and_capture(
const char *host, const char *port, int family, int flags,
const std::initializer_list<int> options ={}, JACK *predecessor=nullptr,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
void close_and_release(
JACK&,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
void close_descriptor(int) noexcept;
[[nodiscard]] SESSION capture(const JACK ©) noexcept;
void release(JACK *) noexcept;
JACK *find_jack(const QUERY &) const noexcept;
JACK *find_epoll_jack() const noexcept;
JACK &get_jack(const QUERY &) const noexcept;
JACK &get_epoll_jack() const noexcept;
const PIPE *find_descriptors(EVENT) const noexcept;
void set_event(JACK &, EVENT, bool val =true) noexcept;
void rem_event(JACK &, EVENT) noexcept;
[[nodiscard]] bool has_event(const JACK &, EVENT) const noexcept;
void rem_child(JACK &, JACK &child) const noexcept;
[[nodiscard]] bool is_listener(const JACK &) const noexcept;
size_t count(INDEX::TYPE, KEY key) const noexcept;
INDEX::ENTRY find(
INDEX::TYPE, KEY key, PIPE::ENTRY value ={},
size_t start_i =std::numeric_limits<size_t>::max(),
size_t iterations =std::numeric_limits<size_t>::max()
) const noexcept;
size_t erase(
INDEX::TYPE, KEY key, PIPE::ENTRY value ={},
size_t start_i =std::numeric_limits<size_t>::max(),
size_t iterations =std::numeric_limits<size_t>::max()
) noexcept;
[[nodiscard]] ERROR reserve(INDEX::TYPE, KEY key, size_t capacity) noexcept;
[[nodiscard]] INDEX::ENTRY insert(
INDEX::TYPE, KEY key, PIPE::ENTRY value
) noexcept;
[[nodiscard]] ERROR reindex() noexcept;
void erase(PIPE &pipe, size_t index) const noexcept;
void destroy(PIPE &pipe) noexcept;
void set_value(INDEX::ENTRY, PIPE::ENTRY) noexcept;
PIPE::ENTRY get_value(INDEX::ENTRY) const noexcept;
PIPE::ENTRY get_entry(const PIPE &pipe, size_t index) const noexcept;
PIPE::ENTRY get_last(const PIPE &pipe) const noexcept;
PIPE::ENTRY pop_back(PIPE &pipe) const noexcept;
[[nodiscard]] ERROR reserve(PIPE&, size_t capacity) noexcept;
[[nodiscard]] ERROR insert(PIPE&, PIPE::ENTRY) noexcept;
[[nodiscard]] ERROR insert(PIPE&, size_t index, PIPE::ENTRY) noexcept;
[[nodiscard]] ERROR copy(const PIPE &src, PIPE &dst) noexcept;
[[nodiscard]] ERROR append(const PIPE &src, PIPE &dst) noexcept;
void replace(PIPE&, size_t index, PIPE::ENTRY) const noexcept;
bool swap_sessions(JACK *, JACK *) noexcept;
ERROR swap(PIPE &, PIPE &) noexcept;
PIPE &get_buffer(BUFFER) noexcept;
INDEX &get_index(INDEX::TYPE) noexcept;
KEY to_key (PIPE::ENTRY) const noexcept;
JACK *to_jack (PIPE::ENTRY) const noexcept;
MEMORY *to_memory(PIPE::ENTRY) const noexcept;
int to_int (PIPE::ENTRY) const noexcept;
uint64_t to_uint64(PIPE::ENTRY) const noexcept;
int *to_int (const PIPE &) const noexcept;
char *to_char (const PIPE &) const noexcept;
uint8_t *to_uint8 (const PIPE &) const noexcept;
uint64_t *to_uint64 (const PIPE &) const noexcept;
KEY *to_key (const PIPE &) const noexcept;
void **to_ptr (const PIPE &) const noexcept;
epoll_event *to_epoll_event(const PIPE &) const noexcept;
void *to_ptr(PIPE::ENTRY &) const noexcept;
void *to_ptr(PIPE &, size_t index) const noexcept;
const void *to_ptr(const PIPE &, size_t index) const noexcept;
void enlist(MEMORY &, MEMORY *&list) noexcept;
void unlist(MEMORY &, MEMORY *&list) noexcept;
const MEMORY *find_memory(const void *) const noexcept;
MEMORY *find_memory(const void *) noexcept;
const MEMORY &get_memory(const void *) const noexcept;
MEMORY &get_memory(const void *) noexcept;
[[nodiscard]] INDEX::TABLE *allocate_tables(size_t count) noexcept;
void destroy_and_delete(INDEX::TABLE *tables, size_t count) noexcept;
[[nodiscard]] MEMORY *allocate_and_index(
size_t byte_count, size_t alignment, const void *copy =nullptr
) noexcept;
[[nodiscard]] MEMORY *allocate(const size_t bytes, size_t align) noexcept;
void deallocate(MEMORY &) noexcept;
void recycle(MEMORY &) noexcept;
[[nodiscard]] JACK *new_jack(const JACK *copy =nullptr) noexcept;
ERROR report(
SESSION, const char *fmt, ...
) const noexcept __attribute__((format(printf, 3, 4)));
template<class... Args>
void log(const char *fmt, Args&&... args) const noexcept {
report(make_session(ERROR::NONE), fmt, std::forward<Args>(args)...);
}
ERROR report(
ERROR,
int line =__builtin_LINE(), const char *file =LEAF(__builtin_FILE()),
char const *function = __builtin_FUNCTION()
) const noexcept;
ERROR report(
ERROR, int code, char const *function, const char *message,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) const noexcept;
ERROR report_bug(
const char *comment =nullptr,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) const noexcept;
ERROR report_bad_request(
const char *comment =nullptr,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) const noexcept;
ERROR report_memory_exhaustion(
const char *comment =nullptr,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) const noexcept;
const RESULT &report(const RESULT &) noexcept;
const RESULT &report(size_t session_id, const RESULT &) noexcept;
const RESULT &report(const JACK *, const RESULT &) noexcept;
bool fuse(
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) const noexcept;
[[noreturn]] void die(
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) const noexcept;
static constexpr RESULT make_result(
int value, int, ERROR,
const char *comment, const char *function, const char *file, int line
) noexcept;
RESULT call_sigfillset(
sigset_t *set,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_sigemptyset(
sigset_t *set,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_epoll_create1(
int flags,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_epoll_pwait(
int epfd, struct epoll_event *events, int maxevents, int timeout,
const sigset_t *sigmask,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_getsockopt(
int sockfd, int level, int optname, void *optval, socklen_t *optlen,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_accept4(
int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_getnameinfo(
const struct sockaddr *addr, socklen_t addrlen, char *host,
socklen_t hostlen, char *serv, socklen_t servlen, int flags,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_shutdown(
int sockfd, int how,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_listen(
int sockfd, int backlog,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_getsockname(
int sockfd, struct sockaddr *addr, socklen_t *addrlen,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_epoll_ctl(
int epfd, int op, int fd, struct epoll_event *event,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_pthread_sigmask(
int how, const sigset_t *set, sigset_t *oldset,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) const noexcept;
RESULT call_getaddrinfo(
const char *node, const char *service, const struct addrinfo *hints,
struct addrinfo **res,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_socket(
int domain, int type, int protocol,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_setsockopt(
int sockfd, int level, int optname, const void *optval,
socklen_t optlen,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_bind(
int sockfd, const struct sockaddr *addr, socklen_t addrlen,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_connect(
int sockfd, const struct sockaddr *addr, socklen_t addrlen,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
RESULT call_close(
int fd,
const char *file =LEAF(__builtin_FILE()), int line =__builtin_LINE()
) noexcept;
void clear() noexcept;
ERROR err(ERROR) noexcept;
void (*log_callback)(SESSION, const char *text) noexcept;
INDEX indices[static_cast<size_t>(INDEX::TYPE::MAX_TYPES)];
PIPE buffers[static_cast<size_t>(BUFFER::MAX_BUFFERS)];
struct MEMPOOL {
MEMORY *free[sizeof(size_t) * BITS_PER_BYTE];
MEMORY *list;
size_t usage;
size_t top;
size_t cap;
bool oom:1;
} mempool;
static constexpr struct MEMPOOL make_mempool() noexcept;
EVENT handled;
ERROR errored;
size_t last_jack_id;
size_t jack_count;
struct BITSET {
bool alerted:1;
bool timeout:1;
bool reindex:1;
} bitset;
sigset_t sigset_all;
sigset_t sigset_none;
public:
mutable uint8_t fuses[768];
};
inline bool operator!(SOCKETS::ERROR error) noexcept {
return error == static_cast<SOCKETS::ERROR>(0);
}
inline bool operator!(SOCKETS::RESULT result) noexcept {
return result.error != SOCKETS::ERROR::NONE || result.code != 0;
}
inline bool operator!(SOCKETS::SESSION session) noexcept {
return session.valid == false;
}
inline SOCKETS::SOCKETS() noexcept :
log_callback(nullptr), indices{}, buffers{}, mempool{make_mempool()},
handled{}, errored{}, last_jack_id{}, jack_count{}, bitset{}, sigset_all{},
sigset_none{}, fuses{} {
}
inline SOCKETS::~SOCKETS() {
if (mempool.usage > sizeof(SOCKETS)) {
log(
"memory usage remains at %lu byte%s (leak?)",
mempool.usage, mempool.usage == 1 ? "" : "s"
);
}
for (INDEX &index : indices) {
if (index.type == INDEX::TYPE::NONE) {
continue;
}
log(
"%s\n", "destroying instance without having it deinitialized first"
);
break;
}
}
inline void SOCKETS::clear() noexcept {
errored = ERROR::NONE;
handled = EVENT::NONE;
for (PIPE &buffer : buffers) {
destroy(buffer);
}
for (INDEX &index : indices) {
if (index.table) {
destroy_and_delete(index.table, index.buckets);
index.table = nullptr;
}
index.buckets = 0;
index.entries = 0;
index.type = INDEX::TYPE::NONE;
}
if (mempool.list) {
report_bug(
// We should have already explicitly deallocated all memory.
);
while (mempool.list) {
deallocate(*mempool.list);
}
}
for (MEMORY *&free : mempool.free) {
while (free) {
deallocate(*free);
}
}
mempool.usage = sizeof(SOCKETS);
mempool.top = mempool.usage;
last_jack_id = 0;
jack_count = 0;
bitset = {};
std::fill(fuses, fuses+sizeof(fuses), 0);
}
inline bool SOCKETS::init() noexcept {
for (INDEX &index : indices) {
if (index.type != INDEX::TYPE::NONE) {
log("%s: already initialized", __FUNCTION__);
return false;
}
}
if (!report(call_sigfillset(&sigset_all))
|| !report(call_sigemptyset(&sigset_none))) {
return false;
}
clear();
for (INDEX &index : indices) {
index.type = static_cast<INDEX::TYPE>(&index - &indices[0]);
switch (index.type) {
default: {
index.buckets = 1;
index.multimap = false;
index.autogrow = true;
break;
}
case INDEX::TYPE::EVENT_DESCRIPTOR: {
index.buckets = static_cast<size_t>(EVENT::MAX_EVENTS);
index.multimap = true;
index.autogrow = false;
break;
}
}
switch (index.type) {
case INDEX::TYPE::NONE: continue;
case INDEX::TYPE::EVENT_DESCRIPTOR:
case INDEX::TYPE::DESCRIPTOR_JACK:
case INDEX::TYPE::SESSION_JACK:
case INDEX::TYPE::RESOURCE_MEMORY: {
index.table = allocate_tables(index.buckets);
break;
}
default: die();
}
if (index.table == nullptr) {
report_memory_exhaustion();
clear();
return false;
}
for (size_t j=0; j<index.buckets; ++j) {
INDEX::TABLE &table = index.table[j];
PIPE &key_pipe = table.key;
PIPE &val_pipe = table.value;
key_pipe.type = PIPE::TYPE::KEY;
switch (index.type) {
case INDEX::TYPE::SESSION_JACK:
case INDEX::TYPE::DESCRIPTOR_JACK: {
val_pipe.type = PIPE::TYPE::JACK_PTR;
break;
}
case INDEX::TYPE::RESOURCE_MEMORY: {
val_pipe.type = PIPE::TYPE::MEMORY_PTR;
break;
}
case INDEX::TYPE::EVENT_DESCRIPTOR: {
val_pipe.type = PIPE::TYPE::INT;
break;
}
default: die();
}
if (val_pipe.type == PIPE::TYPE::NONE) {
clear();
report_bug();
return false;
}
}
}
for (PIPE &pipe : buffers) {
switch (static_cast<BUFFER>(&pipe - &buffers[0])) {
case BUFFER::NEXT_ERROR: {
pipe.type = PIPE::TYPE::INT;
break;
}
case BUFFER::MAX_BUFFERS: die();
}
}
SESSION epoll_session{ create_epoll() };
if (!epoll_session.valid) {
log(
"%s: %s, %s (%s:%d)", __FUNCTION__,
"epoll jack could not be created", to_string(epoll_session.error),
LEAF(__FILE__), __LINE__
);
return false;
}
return true;
}
inline bool SOCKETS::deinit() noexcept {
if (!find_epoll_jack()) {
log("%s: already deinitialized", __FUNCTION__);
return false;
}
bool success = true;
INDEX &descriptor_jack = get_index(INDEX::TYPE::DESCRIPTOR_JACK);
for (size_t bucket=0; bucket<descriptor_jack.buckets; ++bucket) {
while (descriptor_jack.table[bucket].key.size) {
JACK *const jack{
to_jack(
get_last(descriptor_jack.table[bucket].value)
)
};
close_and_release(*jack);
}
}
clear();
return success;
}
inline void SOCKETS::set_logger(
void (*callback)(SOCKETS::SESSION, const char *) noexcept
) noexcept {
log_callback = callback;
}
inline void SOCKETS::set_memcap(size_t bytes) noexcept {
mempool.cap = bytes;
}
inline size_t SOCKETS::get_memcap() const noexcept {
return mempool.cap;
}
inline size_t SOCKETS::get_memtop() const noexcept {
return mempool.top;
}
inline SOCKETS::ERROR SOCKETS::set_intake(
size_t sid, size_t bytes, const char *file, int line
) noexcept {
JACK *jack = find_jack(make_session_query(sid));
if (jack) {
jack->intake = bytes;
return ERROR::NONE;
}
return fuse() ? report(
make_session(sid, ERROR::BAD_REQUEST),
"session not found (%s:%d)", file, line
) : ERROR::BAD_REQUEST;
}
inline SOCKETS::SESSION SOCKETS::listen(
const char *port, int family, const std::initializer_list<int> options,
int flags
) noexcept {
return listen(nullptr, port, family, AI_PASSIVE|flags, options);
}
inline struct SOCKETS::ALERT SOCKETS::next_alert() noexcept {
size_t session;
bitset.alerted = false;
while (( session = next_connection() ) != 0) {
return make_alert(session, EVENT::CONNECTION);
}
while (( session = next_incoming() ) != 0) {
return make_alert(session, EVENT::INCOMING);
}
while (( session = next_disconnection() ) != 0) {
return make_alert(session, EVENT::DISCONNECTION);
}
return make_alert(0, EVENT::NONE, false);
}
inline size_t SOCKETS::next_connection() noexcept {
JACK *const jack = find_jack(make_event_query(EVENT::CONNECTION));
if (jack) {
rem_event(*jack, EVENT::CONNECTION);
return jack->id;
}
return 0;
}
inline size_t SOCKETS::next_disconnection() noexcept {
if (find_jack(make_event_query(EVENT::CONNECTION))) {
// We postpone reporting any disconnections until the application
// has acknowledged all the new incoming connections. This prevents
// us from reporting a disconnection event before its respective
// connection event is reported.
return 0;
}
JACK *const jack = find_jack(make_event_query(EVENT::DISCONNECTION));
if (jack) {
set_event(*jack, EVENT::CLOSE);
rem_event(*jack, EVENT::DISCONNECTION);
return jack->id;
}
return 0;
}
inline size_t SOCKETS::next_incoming() noexcept {
JACK *const jack = find_jack(make_event_query(EVENT::INCOMING));
if (jack) {
rem_event(*jack, EVENT::INCOMING);
return jack->id;
}
return 0;
}
inline bool SOCKETS::is_listener(const JACK &jack) const noexcept {
return jack.bitset.listener;
}
inline bool SOCKETS::is_listener(size_t sid) const noexcept {
const JACK *const jack = find_jack(make_session_query(sid));
return jack ? is_listener(*jack) : false;
}
inline SOCKETS::SESSION SOCKETS::get_listener(size_t sid) const noexcept {
const JACK *const jack = find_jack(make_session_query(sid));
if (!jack) {
return make_session(ERROR::NONE);
}
const JACK *const parent{
find_jack(make_descriptor_query(jack->parent.descriptor))
};