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node_http2.h
1297 lines (1086 loc) · 47.9 KB
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node_http2.h
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#ifndef SRC_NODE_HTTP2_H_
#define SRC_NODE_HTTP2_H_
#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
// FIXME(joyeecheung): nghttp2.h needs stdint.h to compile on Windows
#include <cstdint>
#include "nghttp2/nghttp2.h"
#include "node_http2_state.h"
#include "node_perf.h"
#include "stream_base-inl.h"
#include "string_bytes.h"
#include <algorithm>
#include <queue>
namespace node {
namespace http2 {
using v8::Array;
using v8::Context;
using v8::Isolate;
using v8::MaybeLocal;
using performance::PerformanceEntry;
// We strictly limit the number of outstanding unacknowledged PINGS a user
// may send in order to prevent abuse. The current default cap is 10. The
// user may set a different limit using a per Http2Session configuration
// option.
#define DEFAULT_MAX_PINGS 10
// Also strictly limit the number of outstanding SETTINGS frames a user sends
#define DEFAULT_MAX_SETTINGS 10
// Default maximum total memory cap for Http2Session.
#define DEFAULT_MAX_SESSION_MEMORY 1e7
// These are the standard HTTP/2 defaults as specified by the RFC
#define DEFAULT_SETTINGS_HEADER_TABLE_SIZE 4096
#define DEFAULT_SETTINGS_ENABLE_PUSH 1
#define DEFAULT_SETTINGS_MAX_CONCURRENT_STREAMS 0xffffffffu
#define DEFAULT_SETTINGS_INITIAL_WINDOW_SIZE 65535
#define DEFAULT_SETTINGS_MAX_FRAME_SIZE 16384
#define DEFAULT_SETTINGS_MAX_HEADER_LIST_SIZE 65535
#define MAX_MAX_FRAME_SIZE 16777215
#define MIN_MAX_FRAME_SIZE DEFAULT_SETTINGS_MAX_FRAME_SIZE
#define MAX_INITIAL_WINDOW_SIZE 2147483647
#define MAX_MAX_HEADER_LIST_SIZE 16777215u
#define DEFAULT_MAX_HEADER_LIST_PAIRS 128u
enum nghttp2_session_type {
NGHTTP2_SESSION_SERVER,
NGHTTP2_SESSION_CLIENT
};
enum nghttp2_stream_flags {
NGHTTP2_STREAM_FLAG_NONE = 0x0,
// Writable side has ended
NGHTTP2_STREAM_FLAG_SHUT = 0x1,
// Reading has started
NGHTTP2_STREAM_FLAG_READ_START = 0x2,
// Reading is paused
NGHTTP2_STREAM_FLAG_READ_PAUSED = 0x4,
// Stream is closed
NGHTTP2_STREAM_FLAG_CLOSED = 0x8,
// Stream is destroyed
NGHTTP2_STREAM_FLAG_DESTROYED = 0x10,
// Stream has trailers
NGHTTP2_STREAM_FLAG_TRAILERS = 0x20,
// Stream has received all the data it can
NGHTTP2_STREAM_FLAG_EOS = 0x40
};
enum nghttp2_stream_options {
// Stream is not going to have any DATA frames
STREAM_OPTION_EMPTY_PAYLOAD = 0x1,
// Stream might have trailing headers
STREAM_OPTION_GET_TRAILERS = 0x2,
};
struct nghttp2_stream_write : public MemoryRetainer {
WriteWrap* req_wrap = nullptr;
uv_buf_t buf;
inline explicit nghttp2_stream_write(uv_buf_t buf_) : buf(buf_) {}
inline nghttp2_stream_write(WriteWrap* req, uv_buf_t buf_) :
req_wrap(req), buf(buf_) {}
void MemoryInfo(MemoryTracker* tracker) const override;
SET_MEMORY_INFO_NAME(nghttp2_stream_write)
SET_SELF_SIZE(nghttp2_stream_write)
};
struct nghttp2_header : public MemoryRetainer {
nghttp2_rcbuf* name = nullptr;
nghttp2_rcbuf* value = nullptr;
uint8_t flags = 0;
void MemoryInfo(MemoryTracker* tracker) const override;
SET_MEMORY_INFO_NAME(nghttp2_header)
SET_SELF_SIZE(nghttp2_header)
};
// Unlike the HTTP/1 implementation, the HTTP/2 implementation is not limited
// to a fixed number of known supported HTTP methods. These constants, therefore
// are provided strictly as a convenience to users and are exposed via the
// require('http2').constants object.
#define HTTP_KNOWN_METHODS(V) \
V(ACL, "ACL") \
V(BASELINE_CONTROL, "BASELINE-CONTROL") \
V(BIND, "BIND") \
V(CHECKIN, "CHECKIN") \
V(CHECKOUT, "CHECKOUT") \
V(CONNECT, "CONNECT") \
V(COPY, "COPY") \
V(DELETE, "DELETE") \
V(GET, "GET") \
V(HEAD, "HEAD") \
V(LABEL, "LABEL") \
V(LINK, "LINK") \
V(LOCK, "LOCK") \
V(MERGE, "MERGE") \
V(MKACTIVITY, "MKACTIVITY") \
V(MKCALENDAR, "MKCALENDAR") \
V(MKCOL, "MKCOL") \
V(MKREDIRECTREF, "MKREDIRECTREF") \
V(MKWORKSPACE, "MKWORKSPACE") \
V(MOVE, "MOVE") \
V(OPTIONS, "OPTIONS") \
V(ORDERPATCH, "ORDERPATCH") \
V(PATCH, "PATCH") \
V(POST, "POST") \
V(PRI, "PRI") \
V(PROPFIND, "PROPFIND") \
V(PROPPATCH, "PROPPATCH") \
V(PUT, "PUT") \
V(REBIND, "REBIND") \
V(REPORT, "REPORT") \
V(SEARCH, "SEARCH") \
V(TRACE, "TRACE") \
V(UNBIND, "UNBIND") \
V(UNCHECKOUT, "UNCHECKOUT") \
V(UNLINK, "UNLINK") \
V(UNLOCK, "UNLOCK") \
V(UPDATE, "UPDATE") \
V(UPDATEREDIRECTREF, "UPDATEREDIRECTREF") \
V(VERSION_CONTROL, "VERSION-CONTROL")
// These are provided strictly as a convenience to users and are exposed via the
// require('http2').constants objects
#define HTTP_KNOWN_HEADERS(V) \
V(STATUS, ":status") \
V(METHOD, ":method") \
V(AUTHORITY, ":authority") \
V(SCHEME, ":scheme") \
V(PATH, ":path") \
V(PROTOCOL, ":protocol") \
V(ACCEPT_CHARSET, "accept-charset") \
V(ACCEPT_ENCODING, "accept-encoding") \
V(ACCEPT_LANGUAGE, "accept-language") \
V(ACCEPT_RANGES, "accept-ranges") \
V(ACCEPT, "accept") \
V(ACCESS_CONTROL_ALLOW_CREDENTIALS, "access-control-allow-credentials") \
V(ACCESS_CONTROL_ALLOW_HEADERS, "access-control-allow-headers") \
V(ACCESS_CONTROL_ALLOW_METHODS, "access-control-allow-methods") \
V(ACCESS_CONTROL_ALLOW_ORIGIN, "access-control-allow-origin") \
V(ACCESS_CONTROL_EXPOSE_HEADERS, "access-control-expose-headers") \
V(ACCESS_CONTROL_MAX_AGE, "access-control-max-age") \
V(ACCESS_CONTROL_REQUEST_HEADERS, "access-control-request-headers") \
V(ACCESS_CONTROL_REQUEST_METHOD, "access-control-request-method") \
V(AGE, "age") \
V(ALLOW, "allow") \
V(AUTHORIZATION, "authorization") \
V(CACHE_CONTROL, "cache-control") \
V(CONNECTION, "connection") \
V(CONTENT_DISPOSITION, "content-disposition") \
V(CONTENT_ENCODING, "content-encoding") \
V(CONTENT_LANGUAGE, "content-language") \
V(CONTENT_LENGTH, "content-length") \
V(CONTENT_LOCATION, "content-location") \
V(CONTENT_MD5, "content-md5") \
V(CONTENT_RANGE, "content-range") \
V(CONTENT_TYPE, "content-type") \
V(COOKIE, "cookie") \
V(DATE, "date") \
V(DNT, "dnt") \
V(ETAG, "etag") \
V(EXPECT, "expect") \
V(EXPIRES, "expires") \
V(FORWARDED, "forwarded") \
V(FROM, "from") \
V(HOST, "host") \
V(IF_MATCH, "if-match") \
V(IF_MODIFIED_SINCE, "if-modified-since") \
V(IF_NONE_MATCH, "if-none-match") \
V(IF_RANGE, "if-range") \
V(IF_UNMODIFIED_SINCE, "if-unmodified-since") \
V(LAST_MODIFIED, "last-modified") \
V(LINK, "link") \
V(LOCATION, "location") \
V(MAX_FORWARDS, "max-forwards") \
V(PREFER, "prefer") \
V(PROXY_AUTHENTICATE, "proxy-authenticate") \
V(PROXY_AUTHORIZATION, "proxy-authorization") \
V(RANGE, "range") \
V(REFERER, "referer") \
V(REFRESH, "refresh") \
V(RETRY_AFTER, "retry-after") \
V(SERVER, "server") \
V(SET_COOKIE, "set-cookie") \
V(STRICT_TRANSPORT_SECURITY, "strict-transport-security") \
V(TRAILER, "trailer") \
V(TRANSFER_ENCODING, "transfer-encoding") \
V(TE, "te") \
V(TK, "tk") \
V(UPGRADE_INSECURE_REQUESTS, "upgrade-insecure-requests") \
V(UPGRADE, "upgrade") \
V(USER_AGENT, "user-agent") \
V(VARY, "vary") \
V(VIA, "via") \
V(WARNING, "warning") \
V(WWW_AUTHENTICATE, "www-authenticate") \
V(X_CONTENT_TYPE_OPTIONS, "x-content-type-options") \
V(X_FRAME_OPTIONS, "x-frame-options") \
V(HTTP2_SETTINGS, "http2-settings") \
V(KEEP_ALIVE, "keep-alive") \
V(PROXY_CONNECTION, "proxy-connection")
enum http_known_headers {
HTTP_KNOWN_HEADER_MIN,
#define V(name, value) HTTP_HEADER_##name,
HTTP_KNOWN_HEADERS(V)
#undef V
HTTP_KNOWN_HEADER_MAX
};
// While some of these codes are used within the HTTP/2 implementation in
// core, they are provided strictly as a convenience to users and are exposed
// via the require('http2').constants object.
#define HTTP_STATUS_CODES(V) \
V(CONTINUE, 100) \
V(SWITCHING_PROTOCOLS, 101) \
V(PROCESSING, 102) \
V(EARLY_HINTS, 103) \
V(OK, 200) \
V(CREATED, 201) \
V(ACCEPTED, 202) \
V(NON_AUTHORITATIVE_INFORMATION, 203) \
V(NO_CONTENT, 204) \
V(RESET_CONTENT, 205) \
V(PARTIAL_CONTENT, 206) \
V(MULTI_STATUS, 207) \
V(ALREADY_REPORTED, 208) \
V(IM_USED, 226) \
V(MULTIPLE_CHOICES, 300) \
V(MOVED_PERMANENTLY, 301) \
V(FOUND, 302) \
V(SEE_OTHER, 303) \
V(NOT_MODIFIED, 304) \
V(USE_PROXY, 305) \
V(TEMPORARY_REDIRECT, 307) \
V(PERMANENT_REDIRECT, 308) \
V(BAD_REQUEST, 400) \
V(UNAUTHORIZED, 401) \
V(PAYMENT_REQUIRED, 402) \
V(FORBIDDEN, 403) \
V(NOT_FOUND, 404) \
V(METHOD_NOT_ALLOWED, 405) \
V(NOT_ACCEPTABLE, 406) \
V(PROXY_AUTHENTICATION_REQUIRED, 407) \
V(REQUEST_TIMEOUT, 408) \
V(CONFLICT, 409) \
V(GONE, 410) \
V(LENGTH_REQUIRED, 411) \
V(PRECONDITION_FAILED, 412) \
V(PAYLOAD_TOO_LARGE, 413) \
V(URI_TOO_LONG, 414) \
V(UNSUPPORTED_MEDIA_TYPE, 415) \
V(RANGE_NOT_SATISFIABLE, 416) \
V(EXPECTATION_FAILED, 417) \
V(TEAPOT, 418) \
V(MISDIRECTED_REQUEST, 421) \
V(UNPROCESSABLE_ENTITY, 422) \
V(LOCKED, 423) \
V(FAILED_DEPENDENCY, 424) \
V(TOO_EARLY, 425) \
V(UPGRADE_REQUIRED, 426) \
V(PRECONDITION_REQUIRED, 428) \
V(TOO_MANY_REQUESTS, 429) \
V(REQUEST_HEADER_FIELDS_TOO_LARGE, 431) \
V(UNAVAILABLE_FOR_LEGAL_REASONS, 451) \
V(INTERNAL_SERVER_ERROR, 500) \
V(NOT_IMPLEMENTED, 501) \
V(BAD_GATEWAY, 502) \
V(SERVICE_UNAVAILABLE, 503) \
V(GATEWAY_TIMEOUT, 504) \
V(HTTP_VERSION_NOT_SUPPORTED, 505) \
V(VARIANT_ALSO_NEGOTIATES, 506) \
V(INSUFFICIENT_STORAGE, 507) \
V(LOOP_DETECTED, 508) \
V(BANDWIDTH_LIMIT_EXCEEDED, 509) \
V(NOT_EXTENDED, 510) \
V(NETWORK_AUTHENTICATION_REQUIRED, 511)
enum http_status_codes {
#define V(name, code) HTTP_STATUS_##name = code,
HTTP_STATUS_CODES(V)
#undef V
};
// The Padding Strategy determines the method by which extra padding is
// selected for HEADERS and DATA frames. These are configurable via the
// options passed in to a Http2Session object.
enum padding_strategy_type {
// No padding strategy. This is the default.
PADDING_STRATEGY_NONE,
// Attempts to ensure that the frame is 8-byte aligned
PADDING_STRATEGY_ALIGNED,
// Padding will ensure all data frames are maxFrameSize
PADDING_STRATEGY_MAX,
// Removed and turned into an alias because it is unreasonably expensive for
// very little benefit.
PADDING_STRATEGY_CALLBACK = PADDING_STRATEGY_ALIGNED
};
enum session_state_flags {
SESSION_STATE_NONE = 0x0,
SESSION_STATE_HAS_SCOPE = 0x1,
SESSION_STATE_WRITE_SCHEDULED = 0x2,
SESSION_STATE_CLOSED = 0x4,
SESSION_STATE_CLOSING = 0x8,
SESSION_STATE_SENDING = 0x10,
SESSION_STATE_WRITE_IN_PROGRESS = 0x20,
SESSION_STATE_READING_STOPPED = 0x40,
SESSION_STATE_NGHTTP2_RECV_PAUSED = 0x80
};
typedef uint32_t(*get_setting)(nghttp2_session* session,
nghttp2_settings_id id);
class Http2Session;
class Http2Stream;
// This scope should be present when any call into nghttp2 that may schedule
// data to be written to the underlying transport is made, and schedules
// such a write automatically once the scope is exited.
class Http2Scope {
public:
explicit Http2Scope(Http2Stream* stream);
explicit Http2Scope(Http2Session* session);
~Http2Scope();
private:
Http2Session* session_ = nullptr;
Local<Object> session_handle_;
};
// The Http2Options class is used to parse the options object passed in to
// a Http2Session object and convert those into an appropriate nghttp2_option
// struct. This is the primary mechanism by which the Http2Session object is
// configured.
class Http2Options {
public:
Http2Options(Environment* env, nghttp2_session_type type);
~Http2Options() {
nghttp2_option_del(options_);
}
nghttp2_option* operator*() const {
return options_;
}
void SetMaxHeaderPairs(uint32_t max) {
max_header_pairs_ = max;
}
uint32_t GetMaxHeaderPairs() const {
return max_header_pairs_;
}
void SetPaddingStrategy(padding_strategy_type val) {
padding_strategy_ = val;
}
padding_strategy_type GetPaddingStrategy() const {
return padding_strategy_;
}
void SetMaxOutstandingPings(size_t max) {
max_outstanding_pings_ = max;
}
size_t GetMaxOutstandingPings() {
return max_outstanding_pings_;
}
void SetMaxOutstandingSettings(size_t max) {
max_outstanding_settings_ = max;
}
size_t GetMaxOutstandingSettings() {
return max_outstanding_settings_;
}
void SetMaxSessionMemory(uint64_t max) {
max_session_memory_ = max;
}
uint64_t GetMaxSessionMemory() {
return max_session_memory_;
}
private:
nghttp2_option* options_;
uint64_t max_session_memory_ = DEFAULT_MAX_SESSION_MEMORY;
uint32_t max_header_pairs_ = DEFAULT_MAX_HEADER_LIST_PAIRS;
padding_strategy_type padding_strategy_ = PADDING_STRATEGY_NONE;
size_t max_outstanding_pings_ = DEFAULT_MAX_PINGS;
size_t max_outstanding_settings_ = DEFAULT_MAX_SETTINGS;
};
class Http2Priority {
public:
Http2Priority(Environment* env,
Local<Value> parent,
Local<Value> weight,
Local<Value> exclusive);
nghttp2_priority_spec* operator*() {
return &spec;
}
private:
nghttp2_priority_spec spec;
};
class Http2StreamListener : public StreamListener {
public:
uv_buf_t OnStreamAlloc(size_t suggested_size) override;
void OnStreamRead(ssize_t nread, const uv_buf_t& buf) override;
};
class Http2Stream : public AsyncWrap,
public StreamBase {
public:
static Http2Stream* New(
Http2Session* session,
int32_t id,
nghttp2_headers_category category = NGHTTP2_HCAT_HEADERS,
int options = 0);
~Http2Stream() override;
nghttp2_stream* operator*();
Http2Session* session() { return session_.get(); }
const Http2Session* session() const { return session_.get(); }
void EmitStatistics();
// Required for StreamBase
int ReadStart() override;
// Required for StreamBase
int ReadStop() override;
// Required for StreamBase
int DoShutdown(ShutdownWrap* req_wrap) override;
bool HasWantsWrite() const override { return true; }
// Initiate a response on this stream.
int SubmitResponse(nghttp2_nv* nva, size_t len, int options);
// Submit informational headers for this stream
int SubmitInfo(nghttp2_nv* nva, size_t len);
// Submit trailing headers for this stream
int SubmitTrailers(nghttp2_nv* nva, size_t len);
void OnTrailers();
// Submit a PRIORITY frame for this stream
int SubmitPriority(nghttp2_priority_spec* prispec, bool silent = false);
// Submits an RST_STREAM frame using the given code
void SubmitRstStream(const uint32_t code);
void FlushRstStream();
// Submits a PUSH_PROMISE frame with this stream as the parent.
Http2Stream* SubmitPushPromise(
nghttp2_nv* nva,
size_t len,
int32_t* ret,
int options = 0);
void Close(int32_t code);
// Destroy this stream instance and free all held memory.
void Destroy();
inline bool IsDestroyed() const {
return flags_ & NGHTTP2_STREAM_FLAG_DESTROYED;
}
inline bool IsWritable() const {
return !(flags_ & NGHTTP2_STREAM_FLAG_SHUT);
}
inline bool IsPaused() const {
return flags_ & NGHTTP2_STREAM_FLAG_READ_PAUSED;
}
inline bool IsClosed() const {
return flags_ & NGHTTP2_STREAM_FLAG_CLOSED;
}
inline bool HasTrailers() const {
return flags_ & NGHTTP2_STREAM_FLAG_TRAILERS;
}
// Returns true if this stream is in the reading state, which occurs when
// the NGHTTP2_STREAM_FLAG_READ_START flag has been set and the
// NGHTTP2_STREAM_FLAG_READ_PAUSED flag is *not* set.
inline bool IsReading() const {
return flags_ & NGHTTP2_STREAM_FLAG_READ_START &&
!(flags_ & NGHTTP2_STREAM_FLAG_READ_PAUSED);
}
// Returns the RST_STREAM code used to close this stream
inline int32_t code() const { return code_; }
// Returns the stream identifier for this stream
inline int32_t id() const { return id_; }
inline void IncrementAvailableOutboundLength(size_t amount);
inline void DecrementAvailableOutboundLength(size_t amount);
bool AddHeader(nghttp2_rcbuf* name, nghttp2_rcbuf* value, uint8_t flags);
inline std::vector<nghttp2_header> move_headers() {
return std::move(current_headers_);
}
inline nghttp2_headers_category headers_category() const {
return current_headers_category_;
}
void StartHeaders(nghttp2_headers_category category);
// Required for StreamBase
bool IsAlive() override {
return true;
}
// Required for StreamBase
bool IsClosing() override {
return false;
}
AsyncWrap* GetAsyncWrap() override { return this; }
int DoWrite(WriteWrap* w, uv_buf_t* bufs, size_t count,
uv_stream_t* send_handle) override;
void MemoryInfo(MemoryTracker* tracker) const override {
tracker->TrackField("current_headers", current_headers_);
tracker->TrackField("queue", queue_);
}
SET_MEMORY_INFO_NAME(Http2Stream)
SET_SELF_SIZE(Http2Stream)
std::string diagnostic_name() const override;
// JavaScript API
static void GetID(const FunctionCallbackInfo<Value>& args);
static void Destroy(const FunctionCallbackInfo<Value>& args);
static void Priority(const FunctionCallbackInfo<Value>& args);
static void PushPromise(const FunctionCallbackInfo<Value>& args);
static void RefreshState(const FunctionCallbackInfo<Value>& args);
static void Info(const FunctionCallbackInfo<Value>& args);
static void Trailers(const FunctionCallbackInfo<Value>& args);
static void Respond(const FunctionCallbackInfo<Value>& args);
static void RstStream(const FunctionCallbackInfo<Value>& args);
class Provider;
struct Statistics {
uint64_t start_time;
uint64_t end_time;
uint64_t first_header; // Time first header was received
uint64_t first_byte; // Time first DATA frame byte was received
uint64_t first_byte_sent; // Time first DATA frame byte was sent
uint64_t sent_bytes;
uint64_t received_bytes;
};
Statistics statistics_ = {};
private:
Http2Stream(Http2Session* session,
v8::Local<v8::Object> obj,
int32_t id,
nghttp2_headers_category category,
int options);
BaseObjectWeakPtr<Http2Session> session_; // The Parent HTTP/2 Session
int32_t id_ = 0; // The Stream Identifier
int32_t code_ = NGHTTP2_NO_ERROR; // The RST_STREAM code (if any)
int flags_ = NGHTTP2_STREAM_FLAG_NONE; // Internal state flags
uint32_t max_header_pairs_ = DEFAULT_MAX_HEADER_LIST_PAIRS;
uint32_t max_header_length_ = DEFAULT_SETTINGS_MAX_HEADER_LIST_SIZE;
// The Current Headers block... As headers are received for this stream,
// they are temporarily stored here until the OnFrameReceived is called
// signalling the end of the HEADERS frame
nghttp2_headers_category current_headers_category_ = NGHTTP2_HCAT_HEADERS;
uint32_t current_headers_length_ = 0; // total number of octets
std::vector<nghttp2_header> current_headers_;
// This keeps track of the amount of data read from the socket while the
// socket was in paused mode. When `ReadStart()` is called (and not before
// then), we tell nghttp2 that we consumed that data to get proper
// backpressure handling.
size_t inbound_consumed_data_while_paused_ = 0;
// Outbound Data... This is the data written by the JS layer that is
// waiting to be written out to the socket.
std::queue<nghttp2_stream_write> queue_;
size_t available_outbound_length_ = 0;
Http2StreamListener stream_listener_;
friend class Http2Session;
};
class Http2Stream::Provider {
public:
Provider(Http2Stream* stream, int options);
explicit Provider(int options);
virtual ~Provider();
nghttp2_data_provider* operator*() {
return !empty_ ? &provider_ : nullptr;
}
class FD;
class Stream;
protected:
nghttp2_data_provider provider_;
private:
bool empty_ = false;
};
class Http2Stream::Provider::Stream : public Http2Stream::Provider {
public:
Stream(Http2Stream* stream, int options);
explicit Stream(int options);
static ssize_t OnRead(nghttp2_session* session,
int32_t id,
uint8_t* buf,
size_t length,
uint32_t* flags,
nghttp2_data_source* source,
void* user_data);
};
typedef struct {
uint8_t bitfield;
uint8_t priority_listener_count;
uint8_t frame_error_listener_count;
uint32_t max_invalid_frames = 1000;
uint32_t max_rejected_streams = 100;
} SessionJSFields;
// Indices for js_fields_, which serves as a way to communicate data with JS
// land fast. In particular, we store information about the number/presence
// of certain event listeners in JS, and skip calls from C++ into JS if they
// are missing.
enum SessionUint8Fields {
kBitfield = offsetof(SessionJSFields, bitfield), // See below
kSessionPriorityListenerCount =
offsetof(SessionJSFields, priority_listener_count),
kSessionFrameErrorListenerCount =
offsetof(SessionJSFields, frame_error_listener_count),
kSessionMaxInvalidFrames = offsetof(SessionJSFields, max_invalid_frames),
kSessionMaxRejectedStreams = offsetof(SessionJSFields, max_rejected_streams),
kSessionUint8FieldCount = sizeof(SessionJSFields)
};
enum SessionBitfieldFlags {
kSessionHasRemoteSettingsListeners,
kSessionRemoteSettingsIsUpToDate,
kSessionHasPingListeners,
kSessionHasAltsvcListeners
};
class Http2Session : public AsyncWrap, public StreamListener {
public:
Http2Session(Environment* env,
Local<Object> wrap,
nghttp2_session_type type = NGHTTP2_SESSION_SERVER);
~Http2Session() override;
class Http2Ping;
class Http2Settings;
class MemoryAllocatorInfo;
void EmitStatistics();
inline StreamBase* underlying_stream() {
return static_cast<StreamBase*>(stream_);
}
void Close(uint32_t code = NGHTTP2_NO_ERROR,
bool socket_closed = false);
void Consume(Local<Object> stream);
void Goaway(uint32_t code, int32_t lastStreamID,
const uint8_t* data, size_t len);
void AltSvc(int32_t id,
uint8_t* origin,
size_t origin_len,
uint8_t* value,
size_t value_len);
void Origin(nghttp2_origin_entry* ov, size_t count);
uint8_t SendPendingData();
// Submits a new request. If the request is a success, assigned
// will be a pointer to the Http2Stream instance assigned.
// This only works if the session is a client session.
Http2Stream* SubmitRequest(
nghttp2_priority_spec* prispec,
nghttp2_nv* nva,
size_t len,
int32_t* ret,
int options = 0);
inline nghttp2_session_type type() const { return session_type_; }
inline nghttp2_session* session() const { return session_; }
inline nghttp2_session* operator*() { return session_; }
inline uint32_t GetMaxHeaderPairs() const { return max_header_pairs_; }
inline const char* TypeName() const;
inline bool IsDestroyed() {
return (flags_ & SESSION_STATE_CLOSED) || session_ == nullptr;
}
// Schedule a write if nghttp2 indicates it wants to write to the socket.
void MaybeScheduleWrite();
// Stop reading if nghttp2 doesn't want to anymore.
void MaybeStopReading();
// Returns pointer to the stream, or nullptr if stream does not exist
inline Http2Stream* FindStream(int32_t id);
inline bool CanAddStream();
// Adds a stream instance to this session
inline void AddStream(Http2Stream* stream);
// Removes a stream instance from this session
inline void RemoveStream(Http2Stream* stream);
// Indicates whether there currently exist outgoing buffers for this stream.
bool HasWritesOnSocketForStream(Http2Stream* stream);
// Write data from stream_buf_ to the session
ssize_t ConsumeHTTP2Data();
void MemoryInfo(MemoryTracker* tracker) const override {
tracker->TrackField("streams", streams_);
tracker->TrackField("outstanding_pings", outstanding_pings_);
tracker->TrackField("outstanding_settings", outstanding_settings_);
tracker->TrackField("outgoing_buffers", outgoing_buffers_);
tracker->TrackFieldWithSize("stream_buf", stream_buf_.len);
tracker->TrackFieldWithSize("outgoing_storage", outgoing_storage_.size());
tracker->TrackFieldWithSize("pending_rst_streams",
pending_rst_streams_.size() * sizeof(int32_t));
}
SET_MEMORY_INFO_NAME(Http2Session)
SET_SELF_SIZE(Http2Session)
std::string diagnostic_name() const override;
// Schedule an RstStream for after the current write finishes.
inline void AddPendingRstStream(int32_t stream_id) {
pending_rst_streams_.emplace_back(stream_id);
}
inline bool HasPendingRstStream(int32_t stream_id) {
return pending_rst_streams_.end() != std::find(pending_rst_streams_.begin(),
pending_rst_streams_.end(),
stream_id);
}
// Handle reads/writes from the underlying network transport.
uv_buf_t OnStreamAlloc(size_t suggested_size) override;
void OnStreamRead(ssize_t nread, const uv_buf_t& buf) override;
void OnStreamAfterWrite(WriteWrap* w, int status) override;
// The JavaScript API
static void New(const FunctionCallbackInfo<Value>& args);
static void Consume(const FunctionCallbackInfo<Value>& args);
static void Destroy(const FunctionCallbackInfo<Value>& args);
static void Settings(const FunctionCallbackInfo<Value>& args);
static void Request(const FunctionCallbackInfo<Value>& args);
static void SetNextStreamID(const FunctionCallbackInfo<Value>& args);
static void Goaway(const FunctionCallbackInfo<Value>& args);
static void UpdateChunksSent(const FunctionCallbackInfo<Value>& args);
static void RefreshState(const FunctionCallbackInfo<Value>& args);
static void Ping(const FunctionCallbackInfo<Value>& args);
static void AltSvc(const FunctionCallbackInfo<Value>& args);
static void Origin(const FunctionCallbackInfo<Value>& args);
template <get_setting fn>
static void RefreshSettings(const FunctionCallbackInfo<Value>& args);
uv_loop_t* event_loop() const {
return env()->event_loop();
}
BaseObjectPtr<Http2Ping> PopPing();
Http2Ping* AddPing(BaseObjectPtr<Http2Ping> ping);
BaseObjectPtr<Http2Settings> PopSettings();
Http2Settings* AddSettings(BaseObjectPtr<Http2Settings> settings);
void IncrementCurrentSessionMemory(uint64_t amount) {
current_session_memory_ += amount;
}
void DecrementCurrentSessionMemory(uint64_t amount) {
DCHECK_LE(amount, current_session_memory_);
current_session_memory_ -= amount;
}
// Tell our custom memory allocator that this rcbuf is independent of
// this session now, and may outlive it.
void StopTrackingRcbuf(nghttp2_rcbuf* buf);
// Returns the current session memory including memory allocated by nghttp2,
// the current outbound storage queue, and pending writes.
uint64_t GetCurrentSessionMemory() {
uint64_t total = current_session_memory_ + sizeof(Http2Session);
total += current_nghttp2_memory_;
total += outgoing_storage_.size();
return total;
}
// Return true if current_session_memory + amount is less than the max
bool IsAvailableSessionMemory(uint64_t amount) {
return GetCurrentSessionMemory() + amount <= max_session_memory_;
}
struct Statistics {
uint64_t start_time;
uint64_t end_time;
uint64_t ping_rtt;
uint64_t data_sent;
uint64_t data_received;
uint32_t frame_count;
uint32_t frame_sent;
int32_t stream_count;
size_t max_concurrent_streams;
double stream_average_duration;
};
Statistics statistics_ = {};
private:
// Frame Padding Strategies
ssize_t OnDWordAlignedPadding(size_t frameLength,
size_t maxPayloadLen);
ssize_t OnMaxFrameSizePadding(size_t frameLength,
size_t maxPayloadLen);
// Frame Handler
int HandleDataFrame(const nghttp2_frame* frame);
void HandleGoawayFrame(const nghttp2_frame* frame);
void HandleHeadersFrame(const nghttp2_frame* frame);
void HandlePriorityFrame(const nghttp2_frame* frame);
void HandleSettingsFrame(const nghttp2_frame* frame);
void HandlePingFrame(const nghttp2_frame* frame);
void HandleAltSvcFrame(const nghttp2_frame* frame);
void HandleOriginFrame(const nghttp2_frame* frame);
// nghttp2 callbacks
static int OnBeginHeadersCallback(
nghttp2_session* session,
const nghttp2_frame* frame,
void* user_data);
static int OnHeaderCallback(
nghttp2_session* session,
const nghttp2_frame* frame,
nghttp2_rcbuf* name,
nghttp2_rcbuf* value,
uint8_t flags,
void* user_data);
static int OnFrameReceive(
nghttp2_session* session,
const nghttp2_frame* frame,
void* user_data);
static int OnFrameNotSent(
nghttp2_session* session,
const nghttp2_frame* frame,
int error_code,
void* user_data);
static int OnFrameSent(
nghttp2_session* session,
const nghttp2_frame* frame,
void* user_data);
static int OnStreamClose(
nghttp2_session* session,
int32_t id,
uint32_t code,
void* user_data);
static int OnInvalidHeader(
nghttp2_session* session,
const nghttp2_frame* frame,
nghttp2_rcbuf* name,
nghttp2_rcbuf* value,
uint8_t flags,
void* user_data);
static int OnDataChunkReceived(
nghttp2_session* session,
uint8_t flags,
int32_t id,
const uint8_t* data,
size_t len,
void* user_data);
static ssize_t OnSelectPadding(
nghttp2_session* session,
const nghttp2_frame* frame,
size_t maxPayloadLen,
void* user_data);
static int OnNghttpError(
nghttp2_session* session,
const char* message,
size_t len,
void* user_data);
static int OnSendData(
nghttp2_session* session,
nghttp2_frame* frame,
const uint8_t* framehd,
size_t length,
nghttp2_data_source* source,
void* user_data);
static int OnInvalidFrame(
nghttp2_session* session,
const nghttp2_frame* frame,
int lib_error_code,
void* user_data);
struct Callbacks {
inline explicit Callbacks(bool kHasGetPaddingCallback);
inline ~Callbacks();
nghttp2_session_callbacks* callbacks;
};
/* Use callback_struct_saved[kHasGetPaddingCallback ? 1 : 0] */
static const Callbacks callback_struct_saved[2];
// The underlying nghttp2_session handle
nghttp2_session* session_;
// JS-accessible numeric fields, as indexed by SessionUint8Fields.
SessionJSFields js_fields_ = {};
// The session type: client or server
nghttp2_session_type session_type_;
// The maximum number of header pairs permitted for streams on this session
uint32_t max_header_pairs_ = DEFAULT_MAX_HEADER_LIST_PAIRS;
// The maximum amount of memory allocated for this session
uint64_t max_session_memory_ = DEFAULT_MAX_SESSION_MEMORY;
uint64_t current_session_memory_ = 0;
// The amount of memory allocated by nghttp2 internals
uint64_t current_nghttp2_memory_ = 0;
// The collection of active Http2Streams associated with this session
std::unordered_map<int32_t, Http2Stream*> streams_;
int flags_ = SESSION_STATE_NONE;