add yahns

images/yahns/Dockerfile

@@ -0,0 +1,25 @@
+FROM http-garden-soil:latest
+
+RUN apt -y update && apt -y upgrade && apt -y install ruby-dev ragel && gem install raindrops kgio olddoc rack sleepy_penguin kcar
+
+ARG PARSER_REPO
+RUN git clone --recurse-submodules "$PARSER_REPO"
+
+ARG PARSER_VERSION
+RUN cd /app/unicorn && git pull && git checkout "$PARSER_VERSION" && export LC_ALL=C.UTF-8 && make -j$(nproc) install-gem
+
+ARG APP_REPO
+RUN git clone --recurse-submodules "$APP_REPO"
+
+ARG APP_VERSION
+COPY patch.diff .
+RUN cd /app/yahns && git pull && git apply /app/patch.diff && git checkout "$APP_VERSION" && make install-gem
+
+COPY yahns.conf .
+
+ARG CONFIG_FILE
+COPY $CONFIG_FILE ./config.ru
+ARG BACKEND
+RUN sed -i "s/PROXY_BACKEND_PLACEHOLDER/$BACKEND/g" config.ru
+
+CMD ["yahns", "-c", "yahns.conf"]

images/yahns/patch.diff

@@ -0,0 +1,13 @@
+diff --git a/lib/yahns/http_client.rb b/lib/yahns/http_client.rb
+index 826eb8d..5b40018 100644
+--- a/lib/yahns/http_client.rb
++++ b/lib/yahns/http_client.rb
+@@ -8,6 +8,8 @@
+ rescue LoadError
+ end
+
++require 'kgio'
++
+ class Yahns::HttpClient < Kgio::Socket # :nodoc:
+   NULL_IO = StringIO.new(''.dup) # :nodoc:
+

images/yahns/proxy.ru

@@ -0,0 +1,2 @@
+require 'yahns/proxy_pass'
+run Yahns::ProxyPass.new('http://PROXY_BACKEND_PLACEHOLDER')

images/yahns/server.ru

@@ -0,0 +1,21 @@
+require 'json'
+require 'base64'
+
+class Server
+  def call(env)
+    result = {}
+    result['headers'] = []
+    env.each do |key, value|
+      if not ["QUERY_STRING", "REQUEST_METHOD", "REQUEST_PATH", "PATH_INFO", "REQUEST_URI", "SERVER_PROTOCOL", "HTTP_VERSION", "rack.url_scheme", "SERVER_NAME", "SERVER_PORT", "REMOTE_ADDR", "rack.hijack", "rack.input", "rack.errors", "rack.multiprocess", "rack.multithread", "rack.run_once", "rack.hijack?", "rack.version", "SCRIPT_NAME", "SERVER_SOFTWARE", "rack.logger", "rack.tempfiles"].include?(key)
+        result['headers'].push([Base64.encode64(key.sub(/\AHTTP_/, "")).strip(), Base64.encode64(value).strip()])
+      end
+    end
+    result['method'] = Base64.encode64(env["REQUEST_METHOD"]).strip()
+    result['uri'] = Base64.encode64(env["REQUEST_URI"]).strip()
+    result['body'] = Base64.encode64(env["rack.input"].read).strip()
+    result['version'] = Base64.encode64(env["SERVER_PROTOCOL"]).strip()
+    [200, {}, [result.to_json]]
+  end
+end
+
+run Server.new

images/yahns/yahns.conf

@@ -0,0 +1,3 @@
+app(:rack, "/app/config.ru", preload: true) do
+  listen 80
+end