Go: moving source files to the root of the project.

This patch includes packaging changes related to files move.

go/response.go

@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) Max Romanov
+ * Copyright (C) NGINX, Inc.
+ */
+
+package unit
+
+/*
+#include "nxt_cgo_lib.h"
+*/
+import "C"
+
+import (
+	"net/http"
+)
+
+type response struct {
+	header     http.Header
+	headerSent bool
+	req        *http.Request
+	c_req      C.uintptr_t
+}
+
+func new_response(c_req C.uintptr_t, req *http.Request) *response {
+	resp := &response{
+		header: http.Header{},
+		req:    req,
+		c_req:  c_req,
+	}
+
+	return resp
+}
+
+func (r *response) Header() http.Header {
+	return r.header
+}
+
+func (r *response) Write(p []byte) (n int, err error) {
+	if !r.headerSent {
+		r.WriteHeader(http.StatusOK)
+	}
+
+	res := C.nxt_cgo_response_write(r.c_req, buf_ref(p), C.uint32_t(len(p)))
+	return int(res), nil
+}
+
+func (r *response) WriteHeader(code int) {
+	if r.headerSent {
+		// Note: explicitly using Stderr, as Stdout is our HTTP output.
+		nxt_go_warn("multiple response.WriteHeader calls")
+		return
+	}
+	r.headerSent = true
+
+	// Set a default Content-Type
+	if _, hasType := r.header["Content-Type"]; !hasType {
+		r.header.Add("Content-Type", "text/html; charset=utf-8")
+	}
+
+	fields := 0
+	fields_size := 0
+
+	for k, vv := range r.header {
+		for _, v := range vv {
+			fields++
+			fields_size += len(k) + len(v)
+		}
+	}
+
+	C.nxt_cgo_response_create(r.c_req, C.int(code), C.int(fields),
+		C.uint32_t(fields_size))
+
+	for k, vv := range r.header {
+		for _, v := range vv {
+			C.nxt_cgo_response_add_field(r.c_req, str_ref(k), C.uint8_t(len(k)),
+				str_ref(v), C.uint32_t(len(v)))
+		}
+	}
+
+	C.nxt_cgo_response_send(r.c_req)
+}
+
+func (r *response) Flush() {
+	if !r.headerSent {
+		r.WriteHeader(http.StatusOK)
+	}
+}