Initial implementation of an elasticsearch indexer in Go

Closes #1 (closed)

elastic/elastic.go

+package elastic
+
+import (
+	"encoding/json"
+	"io"
+	"io/ioutil"
+)
+
+type Config struct {
+	URL       []string `json:"url"`
+	AWS       bool     `json:"aws"`
+	Region    string   `json:"aws_region"`
+	AccessKey string   `json:"aws_access_key"`
+	SecretKey string   `json:"aws_secret_access_key"`
+}
+
+func ReadConfig(r io.Reader) (*Config, error) {
+	var out Config
+
+	if err := json.NewDecoder(r).Decode(&out); err != nil {
+		return nil, err
+	}
+
+	return &out, nil
+}
+
+type ReaderAsJSONString struct {
+	io.Reader
+}
+
+func (r *ReaderAsJSONString) MarshalJSON() ([]byte, error) {
+	/* TODO: fewer copies
+	out := bytes.NewBuffer(nil)
+	err := out.WriteByte('"')
+	_, err = io.Copy(out, r.Reader) // FIXME: convert to valid JSON string data, escape quote marks
+	err = out.WriteByte('"')
+	return out.Bytes(), err
+	*/
+
+	data, err := ioutil.ReadAll(r.Reader)
+	if err != nil {
+		return nil, err
+	}
+
+	return json.Marshal(string(data))
+}
+
+type Req struct {
+	Blob *ReaderAsJSONString `json:"blob"`
+}