#830 Implement a socket wrapper API for use with LSP connections

4 files changed, 174 insertions, 11 deletions

diff --git a/test/dumb_tcp_client.py b/test/dumb_tcp_client.py
new file mode 100644
index 00000000..3a728b02
--- /dev/null
+++ b/test/dumb_tcp_client.py
@@ -0,0 +1,33 @@
+"""
+This is just a script for testing that the dumb TCP server actually works
+correctly, for verifying that problems with tests are in Vim. Pass the
+same port number given to the test server to check that it's working.
+"""
+import socket
+import sys
+
+
+def main():
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    result = sock.connect_ex(('127.0.0.1', int(sys.argv[1])))
+
+    if result:
+        sock.close()
+        sys.exit("Couldn't connect to the socket!")
+
+    data_sent = 'x' * 1024
+
+    sock.send(data_sent)
+    data_received = sock.recv(1024)
+
+    if data_sent != data_received:
+        sock.close()
+        sys.exit("Data sent didn't match data received.")
+
+    sock.close()
+
+    print("Everything was just fine.")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/test/dumb_tcp_server.py b/test/dumb_tcp_server.py
new file mode 100644
index 00000000..c15db65e
--- /dev/null
+++ b/test/dumb_tcp_server.py
@@ -0,0 +1,40 @@
+"""
+This Python script creates a TCP server that does nothing but send its input
+back to the client that connects to it. Only one argument must be given, a port
+to bind to.
+"""
+import os
+import socket
+import sys
+
+
+def main():
+    if len(sys.argv) < 2 or not sys.argv[1].isdigit():
+        sys.exit('You must specify a port number')
+
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    sock.bind(('127.0.0.1', int(sys.argv[1])))
+    sock.listen(0)
+
+    pid = os.fork()
+
+    if pid:
+        print(pid)
+        sys.exit()
+
+    while True:
+        connection = sock.accept()[0]
+        connection.settimeout(5)
+
+        while True:
+            try:
+                connection.send(connection.recv(1024))
+            except socket.timeout:
+                break
+
+        connection.close()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/test/test_line_join.vader b/test/test_line_join.vader
index 25cefbcf..9356a2b7 100644
--- a/test/test_line_join.vader
+++ b/test/test_line_join.vader
@@ -18,67 +18,67 @@ After:
   delfunction RawCallback
 
 Execute (ALE should handle empty Lists for the lines):
-  let g:last_line = ale#job#JoinNeovimOutput(1, '', [], 'nl', function('LineCallback'))
+  let g:last_line = ale#util#JoinNeovimOutput(1, '', [], 'nl', function('LineCallback'))
 
   AssertEqual [], g:lines
   AssertEqual '', g:last_line
 
 Execute (ALE should pass on full lines for NeoVim):
-  let g:last_line = ale#job#JoinNeovimOutput(1, '', ['x', 'y', ''], 'nl', function('LineCallback'))
+  let g:last_line = ale#util#JoinNeovimOutput(1, '', ['x', 'y', ''], 'nl', function('LineCallback'))
 
   AssertEqual ['x', 'y'], g:lines
   AssertEqual '', g:last_line
 
 Execute (ALE should pass on a single long line):
-  let g:last_line = ale#job#JoinNeovimOutput(1, '', ['x'], 'nl', function('LineCallback'))
+  let g:last_line = ale#util#JoinNeovimOutput(1, '', ['x'], 'nl', function('LineCallback'))
 
   AssertEqual [], g:lines
   AssertEqual 'x', g:last_line
 
 Execute (ALE should handle just a single line of output):
-  let g:last_line = ale#job#JoinNeovimOutput(1, '', ['x', ''], 'nl', function('LineCallback'))
+  let g:last_line = ale#util#JoinNeovimOutput(1, '', ['x', ''], 'nl', function('LineCallback'))
 
   AssertEqual ['x'], g:lines
   AssertEqual '', g:last_line
 
 Execute (ALE should join two incomplete pieces of large lines together):
-  let g:last_line = ale#job#JoinNeovimOutput(1, 'x', ['y'], 'nl', function('LineCallback'))
+  let g:last_line = ale#util#JoinNeovimOutput(1, 'x', ['y'], 'nl', function('LineCallback'))
 
   AssertEqual [], g:lines
   AssertEqual 'xy', g:last_line
 
 Execute (ALE join incomplete lines, and set new ones):
-  let g:last_line = ale#job#JoinNeovimOutput(1, 'x', ['y', 'z', 'a'], 'nl', function('LineCallback'))
+  let g:last_line = ale#util#JoinNeovimOutput(1, 'x', ['y', 'z', 'a'], 'nl', function('LineCallback'))
 
   AssertEqual ['xy', 'z'], g:lines
   AssertEqual 'a', g:last_line
 
 Execute (ALE join incomplete lines, and set new ones, with two elements):
-  let g:last_line = ale#job#JoinNeovimOutput(1, 'x', ['y', 'z'], 'nl', function('LineCallback'))
+  let g:last_line = ale#util#JoinNeovimOutput(1, 'x', ['y', 'z'], 'nl', function('LineCallback'))
 
   AssertEqual ['xy'], g:lines
   AssertEqual 'z', g:last_line
 
 Execute (ALE should pass on full lines for NeoVim for raw data):
-  let g:last_line = ale#job#JoinNeovimOutput(1, '', ['x', 'y', ''], 'raw', function('RawCallback'))
+  let g:last_line = ale#util#JoinNeovimOutput(1, '', ['x', 'y', ''], 'raw', function('RawCallback'))
 
   AssertEqual "x\ny\n", g:data
   AssertEqual '', g:last_line
 
 Execute (ALE should pass on a single long line):
-  let g:last_line = ale#job#JoinNeovimOutput(1, '', ['x'], 'raw', function('RawCallback'))
+  let g:last_line = ale#util#JoinNeovimOutput(1, '', ['x'], 'raw', function('RawCallback'))
 
   AssertEqual 'x', g:data
   AssertEqual '', g:last_line
 
 Execute (ALE should handle just a single line of output):
-  let g:last_line = ale#job#JoinNeovimOutput(1, '', ['x', ''], 'raw', function('RawCallback'))
+  let g:last_line = ale#util#JoinNeovimOutput(1, '', ['x', ''], 'raw', function('RawCallback'))
 
   AssertEqual "x\n", g:data
   AssertEqual '', g:last_line
 
 Execute (ALE should pass on two lines and one incomplete one):
-  let g:last_line = ale#job#JoinNeovimOutput(1, '', ['y', 'z', 'a'], 'raw', function('RawCallback'))
+  let g:last_line = ale#util#JoinNeovimOutput(1, '', ['y', 'z', 'a'], 'raw', function('RawCallback'))
 
   AssertEqual "y\nz\na", g:data
   AssertEqual '', g:last_line
diff --git a/test/test_socket_connections.vader b/test/test_socket_connections.vader
new file mode 100644
index 00000000..71a1728b
--- /dev/null
+++ b/test/test_socket_connections.vader
@@ -0,0 +1,90 @@
+Before:
+  let g:can_run_socket_tests = !has('win32')
+  \ && (exists('*ch_close') || exists('*chanclose'))
+
+  if g:can_run_socket_tests
+    call ale#test#SetDirectory('/testplugin/test')
+
+    let g:channel_id_received = 0
+    let g:data_received = ''
+
+    function! WaitForData(expected_data, timeout) abort
+      let l:ticks = 0
+
+      while l:ticks < a:timeout
+        " Sleep first, so we can switch to the callback.
+        let l:ticks += 10
+        sleep 10ms
+
+        if g:data_received is# a:expected_data
+          break
+        endif
+      endwhile
+    endfunction
+
+    function! TestCallback(channel_id, data) abort
+      let g:channel_id_received = a:channel_id
+      let g:data_received .= a:data
+    endfunction
+
+    let g:port = 10347
+    let g:pid = str2nr(system(
+    \ 'python'
+    \ . ' ' . ale#Escape(g:dir . '/dumb_tcp_server.py')
+    \ . ' ' . g:port
+    \))
+  endif
+
+After:
+  if g:can_run_socket_tests
+    call ale#test#RestoreDirectory()
+
+    unlet! g:channel_id_received
+    unlet! g:data_received
+    unlet! g:channel_id
+
+    delfunction WaitForData
+    delfunction TestCallback
+
+    if has_key(g:, 'pid')
+      call system('kill ' . g:pid)
+    endif
+
+    unlet! g:pid
+    unlet! g:port
+  endif
+
+  unlet! g:can_run_socket_tests
+
+Execute(Sending and receiving connections to sockets should work):
+  if g:can_run_socket_tests
+    let g:channel_id = ale#socket#Open(
+    \ '127.0.0.1:' . g:port,
+    \ {'callback': function('TestCallback')}
+    \)
+
+    Assert g:channel_id >= 0, 'The socket was not opened!'
+
+    call ale#socket#Send(g:channel_id, 'hello')
+    call ale#socket#Send(g:channel_id, ' world')
+
+    AssertEqual 1, ale#socket#IsOpen(g:channel_id)
+
+    " Wait up to 1 second for the expected data to arrive.
+    call WaitForData('hello world', 1000)
+
+    AssertEqual g:channel_id, g:channel_id_received
+    AssertEqual 'hello world', g:data_received
+
+    call ale#socket#Close(g:channel_id)
+
+    AssertEqual 0, ale#socket#IsOpen(g:channel_id)
+  endif
+
+  " NeoVim versions which can't connect to sockets should just fail.
+  if has('nvim') && !exists('*chanclose')
+    AssertEqual -1, ale#socket#Open(
+    \ '127.0.0.1:1111',
+    \ {'callback': function('function')}
+    \)
+  endif