Import benchmark-tools to main repository.

This has adapted for use with bazel from the original commit
a26e93769ebefd82593a43e22fb13a09717cfa6d.

In particular, the style has been made consistent with internal python style
guidelines, and the packages (including the main entrypoint) have been
refactored in order to allow bazel testing targets.

PiperOrigin-RevId: 283484433

1 files changed, 82 insertions, 0 deletions

diff --git a/benchmarks/harness/tunnel_dispatcher.py b/benchmarks/harness/tunnel_dispatcher.py
new file mode 100644
index 000000000..8dfe2862a
--- /dev/null
+++ b/benchmarks/harness/tunnel_dispatcher.py
@@ -0,0 +1,82 @@
+# python3
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Tunnel handles setting up connections to remote machines."""
+
+import os
+import tempfile
+import time
+
+import docker
+import pexpect
+
+SSH_TUNNEL_COMMAND = """ssh
+ -o GlobalKnownHostsFile=/dev/null
+ -o UserKnownHostsFile=/dev/null
+ -o StrictHostKeyChecking=no
+ -nNT -L {filename}:/var/run/docker.sock
+ -i {key_path}
+ {username}@{hostname}"""
+
+
+class Tunnel:
+  """The tunnel object represents the tunnel via ssh.
+
+  This connects a local unix domain socket with a remote socket.
+  """
+
+  def __init__(self, name, hostname: str, username: str, key_path: str,
+               **kwargs):
+    self._filename = tempfile.NamedTemporaryFile(prefix=name).name
+    self._hostname = hostname
+    self._username = username
+    self._key_path = key_path
+    self._kwargs = kwargs
+    self._process = None
+
+  def connect(self):
+    """Connects the SSH tunnel."""
+    cmd = SSH_TUNNEL_COMMAND.format(
+        filename=self._filename,
+        key_path=self._key_path,
+        username=self._username,
+        hostname=self._hostname)
+    self._process = pexpect.spawn(cmd, timeout=10)
+
+    # If given a password, assume we'll be asked for it.
+    if "key_password" in self._kwargs:
+      self._process.expect(["Enter passphrase for key .*: "])
+      self._process.sendline(self._kwargs["key_password"])
+
+    while True:
+      # Wait for the tunnel to appear.
+      if self._process.exitstatus is not None:
+        raise ConnectionError("Error in setting up ssh tunnel")
+      if os.path.exists(self._filename):
+        return
+      time.sleep(0.1)
+
+  def path(self):
+    """Return the socket file."""
+    return self._filename
+
+  def get_docker_client(self):
+    """Returns a docker client for this Tunne0l."""
+    return docker.DockerClient(base_url="unix:/" + self._filename)
+
+  def __del__(self):
+    """Closes the ssh connection process and deletes the socket file."""
+    if self._process:
+      self._process.close()
+    if os.path.exists(self._filename):
+      os.remove(self._filename)