| | |
| | | #include "proto.h" |
| | | #include "shm.h" |
| | | #include <atomic> |
| | | #include <boost/interprocess/offset_ptr.hpp> |
| | | #include <functional> |
| | | #include <stdint.h> |
| | | |
| | | class ShmSocket; |
| | |
| | | // ShmMsg is safe to be stored in shared memory, so POD data or offset_ptr is required. |
| | | // message content layout: (meta) / header_size + header + data_size + data |
| | | |
| | | class ShmMsg : private StaticDataRef<SharedMemory, ShmMsg> |
| | | class ShmMsg |
| | | { |
| | | public: |
| | | static inline SharedMemory &shm() { return GetData(); } |
| | | |
| | | private: |
| | | static ShmSocket &Sender(); |
| | | |
| | | // store ref count, msgs shareing the same data should also hold a pointer of the same RefCount object. |
| | | class RefCount : private boost::noncopyable |
| | | { |
| | |
| | | |
| | | public: |
| | | RefCount() : |
| | | num_(1) { static_assert(std::is_pod<decltype(num_)>::value); } |
| | | num_(1) { } |
| | | // num_(1) { static_assert(std::is_pod<decltype(num_)>::value); } |
| | | int Inc() { return ++num_; } |
| | | int Dec() { return --num_; } |
| | | int Get() { return num_.load(); } |
| | |
| | | typedef int64_t OffsetType; |
| | | static OffsetType Addr(void *ptr) { return reinterpret_cast<OffsetType>(ptr); } |
| | | static void *Ptr(const OffsetType offset) { return reinterpret_cast<void *>(offset); } |
| | | static inline OffsetType BaseAddr() |
| | | { |
| | | static const OffsetType base = Addr(shm().get_address()); // cache value. |
| | | return base; |
| | | } |
| | | OffsetType BaseAddr() const { return Addr(shm().get_address()); } |
| | | |
| | | static const uint32_t kMsgTag = 0xf1e2d3c4; |
| | | struct Meta { |
| | |
| | | |
| | | RefCount count_; |
| | | const uint32_t tag_ = kMsgTag; |
| | | const uint32_t size_ = 0; |
| | | const uint32_t capacity_ = 0; |
| | | const int64_t id_ = 0; |
| | | std::atomic<int64_t> timestamp_; |
| | | bool managed_ = false; |
| | | uint32_t size_ = 0; |
| | | Meta(uint32_t size) : |
| | | size_(size), id_(NewId()), timestamp_(NowSec()) {} |
| | | capacity_(size), id_(NewId()), timestamp_(NowSec()) {} |
| | | }; |
| | | OffsetType offset_; |
| | | static void *Alloc(const size_t size) |
| | | SharedMemory *pshm_; |
| | | |
| | | void *Alloc(const size_t size, const void *src = nullptr) |
| | | { |
| | | void *p = shm().Alloc(sizeof(Meta) + size); |
| | | if (p) { |
| | | auto pmeta = new (p) Meta(size); |
| | | p = pmeta + 1; |
| | | if (src) { |
| | | memcpy(p, src, size); |
| | | } |
| | | } |
| | | return p; |
| | | } |
| | | |
| | | private: |
| | | Meta *meta() const { return get<Meta>() - 1; } |
| | | |
| | | typedef std::function<void(void *p, int len)> ToArray; |
| | | |
| | | template <class Body> |
| | | void *Pack(const BHMsgHead &head, const uint32_t head_len, const Body &body, const uint32_t body_len) |
| | |
| | | }; |
| | | Pack1(head_len, [&](void *p, int len) { head.SerializeToArray(p, len); }); |
| | | Pack1(body_len, [&](void *p, int len) { body.SerializeToArray(p, len); }); |
| | | meta()->size_ = 4 + head_len + 4 + body_len; |
| | | } |
| | | return addr; |
| | | } |
| | | void *Pack(const BHMsgHead &head, const uint32_t head_len, const std::string &body_content) |
| | | { |
| | | void *addr = get(); |
| | | if (addr) { |
| | | auto p = static_cast<char *>(addr); |
| | | auto Pack1 = [&p](uint32_t len, auto &&writer) { |
| | | Put32(p, len); |
| | | p += sizeof(len); |
| | | writer(p, len); |
| | | p += len; |
| | | }; |
| | | Pack1(head_len, [&](void *p, int len) { head.SerializeToArray(p, len); }); |
| | | Pack1(body_content.size(), [&](void *p, int len) { memcpy(p, body_content.data(), len); }); |
| | | meta()->size_ = 4 + head_len + 4 + body_content.size(); |
| | | } |
| | | return addr; |
| | | } |
| | | |
| | | void *Pack(const std::string &content) |
| | | void *Pack(const void *src, const size_t size) |
| | | { |
| | | void *addr = get(); |
| | | if (addr) { |
| | | memcpy(addr, content.data(), content.size()); |
| | | if (addr && src) { |
| | | memcpy(addr, src, size); |
| | | meta()->size_ = size; |
| | | } |
| | | return addr; |
| | | } |
| | | |
| | | void *Pack(const std::string &content) { return Pack(content.data(), content.size()); } |
| | | |
| | | bool Make(void *addr) |
| | | { |
| | | if (!addr) { |
| | | return false; |
| | | } |
| | | ShmMsg(addr).swap(*this); |
| | | offset_ = Addr(addr) - BaseAddr(); |
| | | return true; |
| | | } |
| | | ShmMsg(void *p) : |
| | | offset_(p ? (Addr(p) - BaseAddr()) : 0) {} |
| | | |
| | | template <class T = void> |
| | | T *get() const { return offset_ != 0 ? static_cast<T *>(Ptr(offset_ + BaseAddr())) : nullptr; } |
| | | |
| | | public: |
| | | static bool BindShm(SharedMemory &shm) { return SetData(shm); } |
| | | ShmMsg() : |
| | | offset_(0) {} |
| | | explicit ShmMsg(const OffsetType offset) : |
| | | offset_(offset) {} |
| | | explicit ShmMsg(SharedMemory &shm) : |
| | | offset_(0), pshm_(&shm) {} |
| | | ShmMsg(const OffsetType offset, SharedMemory &shm) : |
| | | offset_(offset), pshm_(&shm) {} |
| | | OffsetType Offset() const { return offset_; } |
| | | OffsetType &OffsetRef() { return offset_; } |
| | | void swap(ShmMsg &a) { std::swap(offset_, a.offset_); } |
| | | SharedMemory &shm() const { return *pshm_; } |
| | | |
| | | void swap(ShmMsg &a) |
| | | { |
| | | std::swap(offset_, a.offset_); |
| | | std::swap(pshm_, a.pshm_); |
| | | } |
| | | bool valid() const { return offset_ != 0 && meta()->tag_ == kMsgTag; } |
| | | int64_t id() const { return valid() ? meta()->id_ : 0; } |
| | | int64_t timestamp() const { return valid() ? meta()->timestamp_.load() : 0; } |
| | |
| | | uint32_t size = sizeof(head_len) + head_len + sizeof(body_len) + body_len; |
| | | return Make(size) && Pack(head, head_len, body, body_len); |
| | | } |
| | | inline bool Make(const BHMsgHead &head, const std::string &body_content) |
| | | { |
| | | uint32_t head_len = head.ByteSizeLong(); |
| | | uint32_t size = sizeof(head_len) + head_len + sizeof(uint32_t) + body_content.size(); |
| | | return Make(size) && Pack(head, head_len, body_content); |
| | | } |
| | | |
| | | template <class Body> |
| | | inline bool Fill(const BHMsgHead &head, const Body &body) |
| | | { |
| | | uint32_t head_len = head.ByteSizeLong(); |
| | | uint32_t body_len = body.ByteSizeLong(); |
| | | uint32_t size = sizeof(head_len) + head_len + sizeof(body_len) + body_len; |
| | | return valid() && (meta()->size_ >= size) && Pack(head, head_len, body, body_len); |
| | | return valid() && (meta()->capacity_ >= size) && Pack(head, head_len, body, body_len); |
| | | } |
| | | |
| | | inline bool Make(const std::string &content) { return Make(content.size()) && Pack(content); } |
| | | inline bool Fill(const std::string &content) { return valid() && (meta()->size_ >= content.size()) && Pack(content); } |
| | | inline bool Make(const void *src, const size_t size) { return Make(Alloc(size, src)); } |
| | | inline bool Fill(const void *src, const size_t size) { return valid() && (meta()->capacity_ >= size) && Pack(src, size); } |
| | | |
| | | inline bool Make(const std::string &content) { return Make(content.data(), content.size()); } |
| | | inline bool Fill(const std::string &content) { return Fill(content.data(), content.size()); } |
| | | |
| | | inline bool Make(const size_t size) { return Make(Alloc(size)); } |
| | | |
| | |
| | | p += 4; |
| | | return head.ParseFromArray(p, msg_size); |
| | | } |
| | | std::string content() const |
| | | { |
| | | auto p = get<char>(); |
| | | return p ? std::string(p, meta()->size_) : std::string(); |
| | | } |
| | | std::string body() const |
| | | { |
| | | auto p = get<char>(); |