Class: Tep::Server

Inherits:
Object
  • Object
show all
Defined in:
lib/tep/server.rb,
lib/tep/server_scheduled.rb

Defined Under Namespace

Classes: Scheduled

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Server

Returns a new instance of Server.



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# File 'lib/tep/server.rb', line 23

def initialize(app)
  @app = app
end

Instance Attribute Details

#app ⇒ Object

Returns the value of attribute app.



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# File 'lib/tep/server.rb', line 21

def app
  @app
end

Instance Method Details

#build_head(req, res) ⇒ Object 



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# File 'lib/tep/server.rb', line 251

def build_head(req, res)
  reason = Tep.reason(res.status)
  head = req.http_version + " " + res.status.to_s + " " + reason + "\r\n"
  res.headers.each do |k, v|
    head = head + k + ": " + v + "\r\n"
  end
  # Set-Cookie can repeat; emit each on its own line.
  ci = 0
  while ci < res.set_cookies.length
    head = head + "Set-Cookie: " + res.set_cookies[ci] + "\r\n"
    ci += 1
  end
  head + "\r\n"
end

#handle_connection(client) ⇒ Object

Keep-alive loop on a single accepted connection.



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# File 'lib/tep/server.rb', line 135

def handle_connection(client)
  keep_going = true
  while keep_going
    n = Sock.sphttp_read_request(client)
    if n <= 0
      break
    end
    blob = Sock.sphttp_request_buf
    req = Parser.parse(blob)
    if req == nil
      send_simple(client, 400, "bad request")
      break
    end

    req.consume_body(client)

    res = Response.new
    @app.dispatch(req, res)

    keep_alive = req.keep_alive? && !res.halted_close?
    write_response(client, req, res, keep_alive)
    keep_going = keep_alive
  end
  Sock.sphttp_close(client)
end

#run(port, workers, quiet) ⇒ Object 



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# File 'lib/tep/server.rb', line 27

def run(port, workers, quiet)
  scheme = "http"
  if Tep::APP.tls_cert.length > 0
    scheme = "https"
  end
  if !quiet
    puts "[tep " + VERSION + "] listening on " + scheme + "://0.0.0.0:" + port.to_s +
         " (workers=" + workers.to_s + ")"
  end

  # Install SIGTERM/SIGINT handlers BEFORE fork so children inherit
  # them; on signal, sphttp_accept returns -1 and the worker loop
  # runs Tep.on_shutdown (flushes events.run_end + future hooks).
  Sock.sphttp_install_term_handlers

  # Inbound TLS (tep#148 phase 2): load the server cert/key once
  # before forking so every worker inherits the SSL_CTX. A bad
  # cert/key is fatal -- fail loud rather than serve plaintext on a
  # port the operator believes is TLS.
  if Tep::APP.tls_cert.length > 0 && Tep::APP.tls_key.length > 0
    if Sock.sphttp_tls_server_init(Tep::APP.tls_cert, Tep::APP.tls_key) < 0
      puts "tep: TLS init failed (cert=" + Tep::APP.tls_cert + ", key=" + Tep::APP.tls_key + ")"
      exit(1)
    end
  end

  if workers <= 1
    sfd = Sock.sphttp_listen(port, 0)
    if sfd < 0
      puts "tep: bind failed on :" + port.to_s
      exit(1)
    end
    worker_loop(sfd)
    # Single-process is its own "parent" -- emit run_end here.
    if Sock.sphttp_shutdown_requested != 0
      Tep.on_shutdown
    end
    return
  end

  # Pre-fork. Each child opens its own SO_REUSEPORT listener so
  # the kernel load-balances accept() across workers.
  i = 0
  while i < workers
    pid = Sock.sphttp_fork
    if pid == 0
      sfd = Sock.sphttp_listen(port, 1)
      if sfd < 0
        puts "tep: worker " + Sock.sphttp_getpid.to_s + " bind failed"
        exit(1)
      end
      worker_loop(sfd)
      exit(0)
    end
    i += 1
  end
  # Parent: reap children until none remain (wait returns -1).
  # On SIGTERM-to-the-pgroup, children break their accept loops and
  # exit; parent's wait_any reaps them in order. Once all workers
  # are gone, emit the single aggregated run_end (re-reading the
  # JSONL for cross-worker stats; see Tep::Events#run_end_aggregated).
  loop do
    gone = Sock.sphttp_wait_any
    if gone < 0
      break
    end
  end
  if Sock.sphttp_shutdown_requested != 0
    Tep.on_shutdown
  end
end

#send_simple(client, status, msg) ⇒ Object 



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# File 'lib/tep/server.rb', line 266

def send_simple(client, status, msg)
  reason = Tep.reason(status)
  body = "<h1>" + status.to_s + " " + reason + "</h1><p>" + msg + "</p>\n"
  head = "HTTP/1.0 " + status.to_s + " " + reason + "\r\n" +
         "Content-Type: text/html; charset=utf-8\r\n" +
         "Content-Length: " + body.length.to_s + "\r\n" +
         "Connection: close\r\n\r\n"
  Sock.sphttp_write_str(client, head + body)
end

#worker_loop(sfd) ⇒ Object 



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# File 'lib/tep/server.rb', line 99

def worker_loop(sfd)
  loop do
    client = Sock.sphttp_accept(sfd)
    if client < 0
      # accept returns -1 with the term flag set after the first
      # SIGTERM/SIGINT (sphttp_accept retries past unrelated
      # signals). Break here; the parent (or this same process for
      # workers=1) emits the aggregated run_end. Workers used to
      # call Tep.on_shutdown here too, which emitted N run_ends
      # in the JSONL for an N-worker deployment (#128).
      if Sock.sphttp_shutdown_requested != 0
        break
      end
      next
    end
    # Inbound TLS: complete the server-side handshake on the freshly
    # accepted fd before reading the request. Bound the handshake
    # with a recv timeout first -- otherwise a connection that opens
    # but never sends a ClientHello (a port probe, a slowloris, a
    # plain-HTTP client) blocks SSL_accept and wedges this worker.
    # Clear the timeout after a successful handshake so normal
    # (incl. keep-alive) request reads aren't bounded. On failure
    # drop the connection.
    if Tep::APP.tls_cert.length > 0
      Sock.sphttp_set_recv_timeout(client, 5000)
      if Sock.sphttp_accept_tls(client) < 0
        Sock.sphttp_close(client)
        next
      end
      Sock.sphttp_set_recv_timeout(client, 0)
    end
    handle_connection(client)
  end
end

#write_response(client, req, res, keep_alive) ⇒ Object 



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# File 'lib/tep/server.rb', line 161

def write_response(client, req, res, keep_alive)
  # WebSocket upgrade is only supported under Tep::Server::Scheduled
  # (the recv loop needs cooperative I/O via Tep::Scheduler.io_wait).
  # Under the prefork-blocking server, fail with 501 so the client
  # sees a clean refusal instead of a half-installed handshake.
  if res.upgrading_ws
    send_simple(client, 501, "WebSocket requires the scheduled server: set :scheduler, :scheduled")
    return
  end
  if res.streaming
    # Chunked-encoding stream. Send headers immediately, hand a
    # Stream writer to the user's Streamer.pump, emit terminator.
    # Connection is closed afterwards (keep-alive + chunked is
    # technically legal but we keep things simple).
    res.headers["Transfer-Encoding"] = "chunked"
    res.headers["Connection"] = "close"
    if !res.headers.key?("Content-Type")
      res.headers["Content-Type"] = "text/event-stream"
    end
    head = build_head(req, res)
    Sock.sphttp_write_str(client, head)
    out = Stream.new(client)
    res.streamer.pump(out)
    Sock.sphttp_write_chunk_end(client)
    return
  end

  if res.file_path.length > 0
    # send_file path -- compute size, emit headers, then stream.
    sz = Sock.sphttp_filesize(res.file_path)
    if sz < 0
      send_simple(client, 404, "file not found")
      return
    end
    # Cache validators for revalidation (#152): a size-mtime ETag +
    # Last-Modified, set before the conditional check.
    mt = Sock.sphttp_file_mtime(res.file_path)
    if mt >= 0
      res.etag(sz.to_s + "-" + mt.to_s)
      res.last_modified(mt)
    end
    if !res.headers.key?("Content-Type")
      res.headers["Content-Type"] = "application/octet-stream"
    end
    if keep_alive
      res.headers["Connection"] = "keep-alive"
    else
      res.headers["Connection"] = "close"
    end
    # Conditional GET: 304 + no body (no sendfile) when the client's
    # cached copy is still fresh.
    if Tep::Cache.not_modified?(req, res)
      res.set_status(304)
      res.headers["Content-Length"] = "0"
      Sock.sphttp_write_str(client, build_head(req, res))
      return
    end
    res.headers["Content-Length"] = sz.to_s
    head = build_head(req, res)
    Sock.sphttp_write_str(client, head)
    Sock.sphttp_sendfile(client, res.file_path)
    return
  end

  # Conditional GET: if the handler set a validator (ETag /
  # Last-Modified) that the request's precondition satisfies, drop to
  # 304 with no body. The validator + cache headers already on res
  # are still emitted; Content-Length becomes 0 below. (Issue #152.)
  if Tep::Cache.not_modified?(req, res)
    res.set_status(304)
    res.set_body("")
  end

  if res.body.length > 0 && !res.headers.key?("Content-Type")
    res.headers["Content-Type"] = "text/html; charset=utf-8"
  end
  res.headers["Content-Length"] = res.body.length.to_s
  if keep_alive
    res.headers["Connection"] = "keep-alive"
  else
    res.headers["Connection"] = "close"
  end

  head = build_head(req, res)
  Sock.sphttp_write_str(client, head)
  if res.body.length > 0
    Sock.sphttp_write_str(client, res.body)
  end
end