From 2e9a34faa9fc8b0123375f220d785ebf2a10e716 Mon Sep 17 00:00:00 2001
From: Jessica Favin <j.favin@hotmail.fr>
Date: Thu, 1 Nov 2018 19:53:37 +0100
Subject: Display errors on sys.stderr

---
 mitmproxy/addons/dumper.py | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/mitmproxy/addons/dumper.py b/mitmproxy/addons/dumper.py
index 87f45976..4b2357f8 100644
--- a/mitmproxy/addons/dumper.py
+++ b/mitmproxy/addons/dumper.py
@@ -27,9 +27,10 @@ def colorful(line, styles):
 
 
 class Dumper:
-    def __init__(self, outfile=sys.stdout):
+    def __init__(self, outfile=sys.stdout, errfile=sys.stderr):
         self.filter: flowfilter.TFilter = None
         self.outfp: typing.io.TextIO = outfile
+        self.errfp: typing.io.TextIO = errfile
 
     def load(self, loader):
         loader.add_option(
@@ -70,6 +71,13 @@ class Dumper:
         if self.outfp:
             self.outfp.flush()
 
+    def echo_error(self, text, ident=None, **style):
+        if ident:
+            text = indent(ident, text)
+        click.secho(text, file=self.errfp, **style)
+        if self.errfp:
+            self.errfp.flush()
+
     def _echo_headers(self, headers):
         for k, v in headers.fields:
             k = strutils.bytes_to_escaped_str(k)
@@ -243,7 +251,7 @@ class Dumper:
             self.echo_flow(f)
 
     def websocket_error(self, f):
-        self.echo(
+        self.echo_error(
             "Error in WebSocket connection to {}: {}".format(
                 human.format_address(f.server_conn.address), f.error
             ),
@@ -268,7 +276,7 @@ class Dumper:
                 f.close_reason))
 
     def tcp_error(self, f):
-        self.echo(
+        self.echo_error(
             "Error in TCP connection to {}: {}".format(
                 human.format_address(f.server_conn.address), f.error
             ),
-- 
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