Add Zipkin support.

config

@@ -9,7 +9,15 @@ NGX_ADDON_SRCS="$NGX_ADDON_SRCS \
 NGX_ADDON_DEPS="$NGX_ADDON_DEPS \
   $ngx_addon_dir/utility/include/ngx_opentracing_utility.h"
 
-. $ngx_addon_dir/lightstep/tracer_config
+if [ "$NGINX_OPENTRACING_VENDOR" = "LIGHTSTEP" ] 
+then
+  . $ngx_addon_dir/lightstep/tracer_config
+elif [ "$NGINX_OPENTRACING_VENDOR" = "ZIPKIN" ]
+then
+  . $ngx_addon_dir/zipkin/tracer_config
+else
+  . $ngx_addon_dir/zipkin/tracer_config
+fi
 
 NGX_ADDON_SRCS="$NGX_ADDON_SRCS \
   $ngx_addon_dir/module/src/ngx_http_opentracing_module.cpp \

lightstep/src/lightstep_tracer.cpp

@@ -1,7 +1,7 @@
-#include <opentracing/noop.h>
-#include <lightstep/tracer.h> 
+#include <lightstep/tracer.h>
 #include <ngx_opentracing_tracer_options.h>
 #include <ngx_opentracing_utility.h>
+#include <opentracing/noop.h>
 #include <string>
 using namespace lightstep;
 using namespace opentracing;

lightstep/tracer_config

@@ -7,5 +7,5 @@ $ngx_addon_dir/lightstep/include/ngx_opentracing_tracer_commands.def"
 CORE_LIBS="$CORE_LIBS \
   -lgrpc++ \
   -lgrpc \
-  -lprotobuf
+  -lprotobuf \
   -llightstep_tracer"

scripts/run_clang_format.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+find . -path ./example/node_modules -prune -o \( -name '*.h' -or -name '*.cpp' \) \
+  -exec clang-format -i {} \;

zipkin/include/ngx_opentracing_tracer_commands.def

@@ -0,0 +1,12 @@
+    {ngx_string("zipkin_service_name"),
+     NGX_HTTP_MAIN_CONF | NGX_CONF_TAKE1, ngx_conf_set_str_slot,
+     NGX_HTTP_MAIN_CONF_OFFSET,
+     offsetof(opentracing_main_conf_t, tracer_options.service_name), nullptr},
+    {ngx_string("zipkin_collector_host"),
+     NGX_HTTP_MAIN_CONF | NGX_CONF_TAKE1, ngx_conf_set_str_slot,
+     NGX_HTTP_MAIN_CONF_OFFSET,
+     offsetof(opentracing_main_conf_t, tracer_options.collector_host), nullptr},
+    {ngx_string("zipkin_collector_port"),
+     NGX_HTTP_MAIN_CONF | NGX_CONF_TAKE1, ngx_conf_set_str_slot,
+     NGX_HTTP_MAIN_CONF_OFFSET,
+     offsetof(opentracing_main_conf_t, tracer_options.collector_port), nullptr},

zipkin/include/ngx_opentracing_tracer_options.h

@@ -0,0 +1,16 @@
+#pragma once
+
+extern "C" {
+#include <nginx.h>
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+}
+
+namespace ngx_opentracing {
+struct tracer_options_t {
+  ngx_str_t collector_host;
+  ngx_str_t collector_port;
+  ngx_str_t service_name;
+};
+}  // namespace ngx_opentracing

zipkin/src/zipkin_tracer.cpp

@@ -0,0 +1,24 @@
+#include <ngx_opentracing_tracer_options.h>
+#include <ngx_opentracing_utility.h>
+#include <opentracing/noop.h>
+#include <zipkin/opentracing.h>
+#include <string>
+using namespace zipkin;
+using namespace opentracing;
+
+namespace ngx_opentracing {
+std::shared_ptr<Tracer> make_tracer(const tracer_options_t &options) {
+  ZipkinOtTracerOptions tracer_options;
+  if (options.collector_host.data)
+    tracer_options.collector_host = to_string(options.collector_host);
+  if (options.collector_port.data)
+    // TODO: Check for errors here?
+    tracer_options.collector_port =
+        std::stoi(to_string(options.collector_port));
+  if (options.service_name.data)
+    tracer_options.service_name = to_string(options.service_name);
+  else
+    tracer_options.service_name = "nginx";
+  return makeZipkinOtTracer(tracer_options);
+}
+}  // namespace ngx_opentracing

zipkin/tracer_config

@@ -0,0 +1,10 @@
+CORE_INCS="$CORE_INCS $ngx_addon_dir/zipkin/include"
+NGX_ADDON_SRCS="$NGX_ADDON_SRCS \
+  $ngx_addon_dir/zipkin/src/zipkin_tracer.cpp"
+NGX_ADDON_DEPS="$NGX_ADDON_DEPS \
+$ngx_addon_dir/zipkin/include/ngx_opentracing_tracer_options.h \
+$ngx_addon_dir/zipkin/include/ngx_opentracing_tracer_commands.def"
+CORE_LIBS="$CORE_LIBS \
+  -lcurl \
+  -lzipkin \
+  -lzipkin_opentracing"