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b7b6879f0b
Rather than early-include sys/socket.h, let's allow the includer to tell cody no networking. libcody/ * cody.hh: Allow user to set CODY_NETWORKING. gcc/cp/ * mapper-resolver.cc: Remove early include of sys/socket.h. Specify no CODY_NETWORKING instead. * module.cc: Specify no CODY_NETWORKING.
805 lines
22 KiB
C++
805 lines
22 KiB
C++
// CODYlib -*- mode:c++ -*-
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// Copyright (C) 2020 Nathan Sidwell, nathan@acm.org
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// License: Apache v2.0
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#ifndef CODY_HH
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#define CODY_HH 1
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// If the user specifies this as non-zero, it must be what we expect,
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// generally only good for requesting no networking
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#if !defined (CODY_NETWORKING)
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// Have a known-good list of networking systems
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#if defined (__unix__) || defined (__MACH__)
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#define CODY_NETWORKING 1
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#else
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#define CODY_NETWORKING 0
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#endif
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#if 0 // For testing
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#undef CODY_NETWORKING
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#define CODY_NETWORKING 0
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#endif
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#endif
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// C++
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#include <memory>
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#include <string>
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#include <vector>
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// C
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#include <cstddef>
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// OS
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#include <errno.h>
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#include <sys/types.h>
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#if CODY_NETWORKING
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#include <sys/socket.h>
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#endif
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namespace Cody {
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// Set version to 1, as this is completely incompatible with 0.
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// Fortunately both versions 0 and 1 will recognize each other's HELLO
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// messages sufficiently to error out
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constexpr unsigned Version = 1;
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// FIXME: I guess we need a file-handle abstraction here
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// Is windows DWORDPTR still?, or should it be FILE *? (ew).
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namespace Detail {
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// C++11 doesn't have utf8 character literals :(
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template<unsigned I>
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constexpr char S2C (char const (&s)[I])
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{
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static_assert (I == 2, "only single octet strings may be converted");
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return s[0];
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}
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/// Internal buffering class. Used to concatenate outgoing messages
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/// and Lex incoming ones.
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class MessageBuffer
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{
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std::vector<char> buffer; ///< buffer holding the message
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size_t lastBol = 0; ///< location of the most recent Beginning Of
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///< Line, or position we've readed when writing
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public:
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MessageBuffer () = default;
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~MessageBuffer () = default;
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MessageBuffer (MessageBuffer &&) = default;
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MessageBuffer &operator= (MessageBuffer &&) = default;
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public:
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///
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/// Finalize a buffer to be written. No more lines can be added to
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/// the buffer. Use before a sequence of Write calls.
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void PrepareToWrite ()
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{
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buffer.push_back (u8"\n"[0]);
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lastBol = 0;
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}
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///
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/// Prepare a buffer for reading. Use before a sequence of Read calls.
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void PrepareToRead ()
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{
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buffer.clear ();
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lastBol = 0;
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}
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public:
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/// Begin a message line. Use before a sequence of Append and
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/// related calls.
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void BeginLine ();
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/// End a message line. Use after a sequence of Append and related calls.
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void EndLine () {}
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public:
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/// Append a string to the current line. No whitespace is prepended
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/// or appended.
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///
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/// @param str the string to be written
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/// @param maybe_quote indicate if there's a possibility the string
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/// contains characters that need quoting. Defaults to false.
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/// It is always safe to set
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/// this true, but that causes an additional scan of the string.
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/// @param len The length of the string. If not specified, strlen
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/// is used to find the length.
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void Append (char const *str, bool maybe_quote = false,
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size_t len = ~size_t (0));
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///
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/// Add whitespace word separator. Multiple adjacent whitespace is fine.
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void Space ()
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{
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Append (Detail::S2C(u8" "));
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}
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public:
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/// Add a word as with Append, but prefixing whitespace to make a
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/// separate word
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void AppendWord (char const *str, bool maybe_quote = false,
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size_t len = ~size_t (0))
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{
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if (buffer.size () != lastBol)
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Space ();
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Append (str, maybe_quote, len);
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}
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/// Add a word as with AppendWord
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/// @param str the string to append
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/// @param maybe_quote string might need quoting, as for Append
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void AppendWord (std::string const &str, bool maybe_quote = false)
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{
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AppendWord (str.data (), maybe_quote, str.size ());
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}
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///
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/// Add an integral value, prepending a space.
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void AppendInteger (unsigned u);
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private:
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/// Append a literal character.
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/// @param c character to append
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void Append (char c);
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public:
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/// Lex the next input line into a vector of words.
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/// @param words filled with a vector of lexed strings
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/// @result 0 if no errors, an errno value on lexxing error such as
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/// there being no next line (ENOENT), or malformed quoting (EINVAL)
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int Lex (std::vector<std::string> &words);
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public:
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/// Append the most-recently lexxed line to a string. May be useful
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/// in error messages. The unparsed line is appended -- before any
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/// unquoting.
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/// If we had c++17 string_view, we'd simply return a view of the
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/// line, and leave it to the caller to do any concatenation.
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/// @param l string to-which the lexxed line is appended.
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void LexedLine (std::string &l);
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public:
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/// Detect if we have reached the end of the input buffer.
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/// I.e. there are no more lines to Lex
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/// @result True if at end
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bool IsAtEnd () const
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{
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return lastBol == buffer.size ();
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}
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public:
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/// Read from end point into a read buffer, as with read(2). This will
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/// not block , unless FD is blocking, and there is nothing
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/// immediately available.
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/// @param fd file descriptor to read from. This may be a regular
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/// file, pipe or socket.
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/// @result on error returns errno. If end of file occurs, returns
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/// -1. At end of message returns 0. If there is more needed
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/// returns EAGAIN (or possibly EINTR). If the message is
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/// malformed, returns EINVAL.
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int Read (int fd) noexcept;
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public:
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/// Write to an end point from a write buffer, as with write(2). As
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/// with Read, this will not usually block.
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/// @param fd file descriptor to write to. This may be a regular
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/// file, pipe or socket.
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/// @result on error returns errno.
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/// At end of message returns 0. If there is more to write
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/// returns EAGAIN (or possibly EINTR).
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int Write (int fd) noexcept;
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};
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///
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/// Request codes. Perhaps this should be exposed? These are likely
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/// useful to servers that queue requests.
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enum RequestCode
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{
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RC_CONNECT,
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RC_MODULE_REPO,
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RC_MODULE_EXPORT,
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RC_MODULE_IMPORT,
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RC_MODULE_COMPILED,
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RC_INCLUDE_TRANSLATE,
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RC_HWM
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};
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/// Internal file descriptor tuple. It's used as an anonymous union member.
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struct FD
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{
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int from; ///< Read from this FD
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int to; ///< Write to this FD
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};
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}
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// Flags for various requests
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enum class Flags : unsigned
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{
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None,
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NameOnly = 1<<0, // Only querying for CMI names, not contents
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};
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inline Flags operator& (Flags a, Flags b)
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{
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return Flags (unsigned (a) & unsigned (b));
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}
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inline Flags operator| (Flags a, Flags b)
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{
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return Flags (unsigned (a) | unsigned (b));
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}
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///
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/// Response data for a request. Returned by Client's request calls,
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/// which return a single Packet. When the connection is Corked, the
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/// Uncork call will return a vector of Packets.
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class Packet
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{
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public:
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///
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/// Packet is a variant structure. These are the possible content types.
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enum Category { INTEGER, STRING, VECTOR};
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private:
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// std:variant is a C++17 thing, so we're doing this ourselves.
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union
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{
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size_t integer; ///< Integral value
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std::string string; ///< String value
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std::vector<std::string> vector; ///< Vector of string value
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};
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Category cat : 2; ///< Discriminator
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private:
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unsigned short code = 0; ///< Packet type
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unsigned short request = 0;
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public:
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Packet (unsigned c, size_t i = 0)
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: integer (i), cat (INTEGER), code (c)
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{
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}
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Packet (unsigned c, std::string &&s)
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: string (std::move (s)), cat (STRING), code (c)
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{
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}
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Packet (unsigned c, std::string const &s)
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: string (s), cat (STRING), code (c)
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{
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}
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Packet (unsigned c, std::vector<std::string> &&v)
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: vector (std::move (v)), cat (VECTOR), code (c)
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{
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}
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// No non-move constructor from a vector. You should not be doing
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// that.
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// Only move constructor and move assignment
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Packet (Packet &&t)
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{
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Create (std::move (t));
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}
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Packet &operator= (Packet &&t)
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{
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Destroy ();
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Create (std::move (t));
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return *this;
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}
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~Packet ()
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{
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Destroy ();
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}
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private:
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///
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/// Variant move creation from another packet
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void Create (Packet &&t);
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///
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/// Variant destruction
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void Destroy ();
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public:
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///
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/// Return the packet type
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unsigned GetCode () const
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{
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return code;
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}
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///
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/// Return the packet type
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unsigned GetRequest () const
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{
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return request;
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}
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void SetRequest (unsigned r)
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{
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request = r;
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}
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///
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/// Return the category of the packet's payload
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Category GetCategory () const
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{
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return cat;
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}
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public:
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///
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/// Return an integral payload. Undefined if the category is not INTEGER
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size_t GetInteger () const
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{
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return integer;
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}
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///
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/// Return (a reference to) a string payload. Undefined if the
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/// category is not STRING
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std::string const &GetString () const
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{
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return string;
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}
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std::string &GetString ()
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{
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return string;
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}
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///
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/// Return (a reference to) a constant vector of strings payload.
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/// Undefined if the category is not VECTOR
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std::vector<std::string> const &GetVector () const
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{
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return vector;
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}
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///
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/// Return (a reference to) a non-conatant vector of strings payload.
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/// Undefined if the category is not VECTOR
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std::vector<std::string> &GetVector ()
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{
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return vector;
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}
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};
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class Server;
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///
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/// Client-side (compiler) object.
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class Client
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{
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public:
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/// Response packet codes
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enum PacketCode
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{
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PC_CORKED, ///< Messages are corked
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PC_CONNECT, ///< Packet is integer version
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PC_ERROR, ///< Packet is error string
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PC_OK,
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PC_BOOL,
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PC_PATHNAME
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};
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private:
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Detail::MessageBuffer write; ///< Outgoing write buffer
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Detail::MessageBuffer read; ///< Incoming read buffer
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std::string corked; ///< Queued request tags
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union
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{
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Detail::FD fd; ///< FDs connecting to server
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Server *server; ///< Directly connected server
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};
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bool is_direct = false; ///< Discriminator
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bool is_connected = false; /// Connection handshake succesful
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private:
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Client ();
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public:
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/// Direct connection constructor.
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/// @param s Server to directly connect
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Client (Server *s)
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: Client ()
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{
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is_direct = true;
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server = s;
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}
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/// Communication connection constructor
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/// @param from file descriptor to read from
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/// @param to file descriptor to write to, defaults to from
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Client (int from, int to = -1)
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: Client ()
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{
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fd.from = from;
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fd.to = to < 0 ? from : to;
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}
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~Client ();
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// We have to provide our own move variants, because of the variant member.
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Client (Client &&);
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Client &operator= (Client &&);
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public:
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///
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/// Direct connection predicate
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bool IsDirect () const
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{
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return is_direct;
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}
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///
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/// Successful handshake predicate
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bool IsConnected () const
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{
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return is_connected;
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}
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public:
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///
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/// Get the read FD
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/// @result the FD to read from, -1 if a direct connection
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int GetFDRead () const
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{
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return is_direct ? -1 : fd.from;
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}
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///
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/// Get the write FD
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/// @result the FD to write to, -1 if a direct connection
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int GetFDWrite () const
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{
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return is_direct ? -1 : fd.to;
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}
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///
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/// Get the directly-connected server
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/// @result the server, or nullptr if a communication connection
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Server *GetServer () const
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{
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return is_direct ? server : nullptr;
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}
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public:
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///
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/// Perform connection handshake. All othe requests will result in
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/// errors, until handshake is succesful.
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/// @param agent compiler identification
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/// @param ident compilation identifiation (maybe nullptr)
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/// @param alen length of agent string, if known
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/// @param ilen length of ident string, if known
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/// @result packet indicating success (or deferrment) of the
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/// connection, payload is optional flags
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Packet Connect (char const *agent, char const *ident,
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size_t alen = ~size_t (0), size_t ilen = ~size_t (0));
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/// std::string wrapper for connection
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/// @param agent compiler identification
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/// @param ident compilation identification
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Packet Connect (std::string const &agent, std::string const &ident)
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{
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return Connect (agent.c_str (), ident.c_str (),
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agent.size (), ident.size ());
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}
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public:
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/// Request compiler module repository
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/// @result packet indicating repo
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Packet ModuleRepo ();
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public:
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/// Inform of compilation of a named module interface or partition,
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/// or a header unit
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/// @param str module or header-unit
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/// @param len name length, if known
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/// @result CMI name (or deferrment/error)
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Packet ModuleExport (char const *str, Flags flags, size_t len = ~size_t (0));
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Packet ModuleExport (char const *str)
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{
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return ModuleExport (str, Flags::None, ~size_t (0));
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}
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Packet ModuleExport (std::string const &s, Flags flags = Flags::None)
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{
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return ModuleExport (s.c_str (), flags, s.size ());
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}
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public:
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/// Importation of a module, partition or header-unit
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/// @param str module or header-unit
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/// @param len name length, if known
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/// @result CMI name (or deferrment/error)
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Packet ModuleImport (char const *str, Flags flags, size_t len = ~size_t (0));
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Packet ModuleImport (char const *str)
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{
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return ModuleImport (str, Flags::None, ~size_t (0));
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}
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Packet ModuleImport (std::string const &s, Flags flags = Flags::None)
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{
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return ModuleImport (s.c_str (), flags, s.size ());
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}
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public:
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/// Successful compilation of a module interface, partition or
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/// header-unit. Must have been preceeded by a ModuleExport
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/// request.
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/// @param str module or header-unit
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/// @param len name length, if known
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/// @result OK (or deferment/error)
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Packet ModuleCompiled (char const *str, Flags flags, size_t len = ~size_t (0));
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Packet ModuleCompiled (char const *str)
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{
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return ModuleCompiled (str, Flags::None, ~size_t (0));
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}
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Packet ModuleCompiled (std::string const &s, Flags flags = Flags::None)
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{
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return ModuleCompiled (s.c_str (), flags, s.size ());
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}
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/// Include translation query.
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/// @param str header unit name
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/// @param len name length, if known
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/// @result Packet indicating include translation boolean, or CMI
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/// name (or deferment/error)
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Packet IncludeTranslate (char const *str, Flags flags,
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size_t len = ~size_t (0));
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Packet IncludeTranslate (char const *str)
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{
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return IncludeTranslate (str, Flags::None, ~size_t (0));
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}
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Packet IncludeTranslate (std::string const &s, Flags flags = Flags::None)
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{
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return IncludeTranslate (s.c_str (), flags, s.size ());
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}
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public:
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/// Cork the connection. All requests are queued up. Each request
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/// call will return a PC_CORKED packet.
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void Cork ();
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/// Uncork the connection. All queued requests are sent to the
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/// server, and a block of responses waited for.
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/// @result A vector of packets, containing the in-order responses to the
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/// queued requests.
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std::vector<Packet> Uncork ();
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///
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/// Indicate corkedness of connection
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bool IsCorked () const
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{
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return !corked.empty ();
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}
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private:
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Packet ProcessResponse (std::vector<std::string> &, unsigned code,
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bool isLast);
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Packet MaybeRequest (unsigned code);
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int CommunicateWithServer ();
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};
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/// This server-side class is used to resolve requests from one or
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/// more clients. You are expected to derive from it and override the
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/// virtual functions it provides. The connection resolver may return
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/// a different resolved object to service the remainder of the
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/// connection -- for instance depending on the compiler that is
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/// making the requests.
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class Resolver
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{
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public:
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Resolver () = default;
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virtual ~Resolver ();
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protected:
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/// Mapping from a module or header-unit name to a CMI file name.
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/// @param module module name
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/// @result CMI name
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virtual std::string GetCMIName (std::string const &module);
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/// Return the CMI file suffix to use
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/// @result CMI suffix, a statically allocated string
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virtual char const *GetCMISuffix ();
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|
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public:
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/// When the requests of a directly-connected server are processed,
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/// we may want to wait for the requests to complete (for instance a
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/// set of subjobs).
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/// @param s directly connected server.
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virtual void WaitUntilReady (Server *s);
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|
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public:
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/// Provide an error response.
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/// @param s the server to provide the response to.
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/// @param msg the error message
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virtual void ErrorResponse (Server *s, std::string &&msg);
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|
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public:
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/// Connection handshake. Provide response to server and return new
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/// (or current) resolver, or nullptr.
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/// @param s server to provide response to
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/// @param version the client's version number
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/// @param agent the client agent (compiler identification)
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/// @param ident the compilation identification (may be empty)
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/// @result nullptr in the case of an error. An error response will
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/// be sent. If handing off to another resolver, return that,
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/// otherwise this
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virtual Resolver *ConnectRequest (Server *s, unsigned version,
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std::string &agent, std::string &ident);
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|
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public:
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// return 0 on ok, ERRNO on failure, -1 on unspecific error
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virtual int ModuleRepoRequest (Server *s);
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|
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|
virtual int ModuleExportRequest (Server *s, Flags flags,
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|
std::string &module);
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|
virtual int ModuleImportRequest (Server *s, Flags flags,
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|
std::string &module);
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|
virtual int ModuleCompiledRequest (Server *s, Flags flags,
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|
std::string &module);
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virtual int IncludeTranslateRequest (Server *s, Flags flags,
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std::string &include);
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|
};
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|
|
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/// This server-side (build system) class handles a single connection
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/// to a client. It has 3 states, READING:accumulating a message
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/// block froma client, WRITING:writing a message block to a client
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/// and PROCESSING:resolving requests. If the server does not spawn
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/// jobs to build needed artifacts, the PROCESSING state will be brief.
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class Server
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|
{
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public:
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|
enum Direction
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|
{
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READING, // Server is waiting for completion of a (set of)
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// requests from client. The next state will be PROCESSING.
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WRITING, // Server is writing a (set of) responses to client.
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// The next state will be READING.
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PROCESSING // Server is processing client request(s). The next
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// state will be WRITING.
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};
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private:
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Detail::MessageBuffer write;
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|
Detail::MessageBuffer read;
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|
Resolver *resolver;
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|
Detail::FD fd;
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|
bool is_connected = false;
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Direction direction : 2;
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|
|
|
public:
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|
Server (Resolver *r);
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Server (Resolver *r, int from, int to = -1)
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: Server (r)
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|
{
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fd.from = from;
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fd.to = to >= 0 ? to : from;
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}
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|
~Server ();
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|
Server (Server &&);
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|
Server &operator= (Server &&);
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|
|
|
public:
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|
bool IsConnected () const
|
|
{
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|
return is_connected;
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|
}
|
|
|
|
public:
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|
void SetDirection (Direction d)
|
|
{
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|
direction = d;
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|
}
|
|
|
|
public:
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|
Direction GetDirection () const
|
|
{
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|
return direction;
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|
}
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|
int GetFDRead () const
|
|
{
|
|
return fd.from;
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|
}
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|
int GetFDWrite () const
|
|
{
|
|
return fd.to;
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|
}
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|
Resolver *GetResolver () const
|
|
{
|
|
return resolver;
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|
}
|
|
|
|
public:
|
|
/// Process requests from a directly-connected client. This is a
|
|
/// small wrapper around ProcessRequests, with some buffer swapping
|
|
/// for communication. It is expected that such processessing is
|
|
/// immediate.
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|
/// @param from message block from client
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|
/// @param to message block to client
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|
void DirectProcess (Detail::MessageBuffer &from, Detail::MessageBuffer &to);
|
|
|
|
public:
|
|
/// Process the messages queued in the read buffer. We enter the
|
|
/// PROCESSING state, and each message line causes various resolver
|
|
/// methods to be called. Once processed, the server may need to
|
|
/// wait for all the requests to be ready, or it may be able to
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|
/// immediately write responses back.
|
|
void ProcessRequests ();
|
|
|
|
public:
|
|
/// Accumulate an error response.
|
|
/// @param error the error message to encode
|
|
/// @param elen length of error, if known
|
|
void ErrorResponse (char const *error, size_t elen = ~size_t (0));
|
|
void ErrorResponse (std::string const &error)
|
|
{
|
|
ErrorResponse (error.data (), error.size ());
|
|
}
|
|
|
|
/// Accumulate an OK response
|
|
void OKResponse ();
|
|
|
|
/// Accumulate a boolean response
|
|
void BoolResponse (bool);
|
|
|
|
/// Accumulate a pathname response
|
|
/// @param path (may be nullptr, or empty)
|
|
/// @param rlen length, if known
|
|
void PathnameResponse (char const *path, size_t plen = ~size_t (0));
|
|
void PathnameResponse (std::string const &path)
|
|
{
|
|
PathnameResponse (path.data (), path.size ());
|
|
}
|
|
|
|
public:
|
|
/// Accumulate a (successful) connection response
|
|
/// @param agent the server-side agent
|
|
/// @param alen agent length, if known
|
|
void ConnectResponse (char const *agent, size_t alen = ~size_t (0));
|
|
void ConnectResponse (std::string const &agent)
|
|
{
|
|
ConnectResponse (agent.data (), agent.size ());
|
|
}
|
|
|
|
public:
|
|
/// Write message block to client. Semantics as for
|
|
/// MessageBuffer::Write.
|
|
/// @result errno or completion (0).
|
|
int Write ()
|
|
{
|
|
return write.Write (fd.to);
|
|
}
|
|
/// Initialize for writing a message block. All responses to the
|
|
/// incomping message block must be complete Enters WRITING state.
|
|
void PrepareToWrite ()
|
|
{
|
|
write.PrepareToWrite ();
|
|
direction = WRITING;
|
|
}
|
|
|
|
public:
|
|
/// Read message block from client. Semantics as for
|
|
/// MessageBuffer::Read.
|
|
/// @result errno, eof (-1) or completion (0)
|
|
int Read ()
|
|
{
|
|
return read.Read (fd.from);
|
|
}
|
|
/// Initialize for reading a message block. Enters READING state.
|
|
void PrepareToRead ()
|
|
{
|
|
read.PrepareToRead ();
|
|
direction = READING;
|
|
}
|
|
};
|
|
|
|
// Helper network stuff
|
|
|
|
#if CODY_NETWORKING
|
|
// Socket with specific address
|
|
int OpenSocket (char const **, sockaddr const *sock, socklen_t len);
|
|
int ListenSocket (char const **, sockaddr const *sock, socklen_t len,
|
|
unsigned backlog);
|
|
|
|
// Local domain socket (eg AF_UNIX)
|
|
int OpenLocal (char const **, char const *name);
|
|
int ListenLocal (char const **, char const *name, unsigned backlog = 0);
|
|
|
|
// ipv6 socket
|
|
int OpenInet6 (char const **e, char const *name, int port);
|
|
int ListenInet6 (char const **, char const *name, int port,
|
|
unsigned backlog = 0);
|
|
#endif
|
|
|
|
// FIXME: Mapping file utilities?
|
|
|
|
}
|
|
|
|
#endif // CODY_HH
|