306 lines
7.0 KiB
Go
306 lines
7.0 KiB
Go
// Copyright 2013 Belogik. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package goes provides an API to access Elasticsearch.
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package goes
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"strings"
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)
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const (
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BULK_COMMAND_INDEX = "index"
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BULK_COMMAND_DELETE = "delete"
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)
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func (err *SearchError) Error() string {
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return fmt.Sprintf("[%d] %s", err.StatusCode, err.Msg)
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}
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// NewConnection initiates a new Connection to an elasticsearch server
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//
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// This function is pretty useless for now but might be useful in a near future
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// if wee need more features like connection pooling or load balancing.
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func NewConnection(host string, port string) *Connection {
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return &Connection{host, port}
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}
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// CreateIndex creates a new index represented by a name and a mapping
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func (c *Connection) CreateIndex(name string, mapping map[string]interface{}) (Response, error) {
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r := Request{
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Conn: c,
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Query: mapping,
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IndexList: []string{name},
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method: "PUT",
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}
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return r.Run()
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}
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// DeleteIndex deletes an index represented by a name
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func (c *Connection) DeleteIndex(name string) (Response, error) {
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r := Request{
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Conn: c,
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IndexList: []string{name},
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method: "DELETE",
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}
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return r.Run()
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}
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// RefreshIndex refreshes an index represented by a name
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func (c *Connection) RefreshIndex(name string) (Response, error) {
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r := Request{
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Conn: c,
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IndexList: []string{name},
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method: "POST",
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api: "_refresh",
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}
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return r.Run()
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}
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// Stats fetches statistics (_stats) for the current elasticsearch server
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func (c *Connection) Stats(indexList []string, extraArgs url.Values) (Response, error) {
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r := Request{
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Conn: c,
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IndexList: indexList,
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ExtraArgs: extraArgs,
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method: "GET",
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api: "_stats",
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}
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return r.Run()
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}
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// IndexStatus fetches the status (_status) for the indices defined in
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// indexList. Use _all in indexList to get stats for all indices
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func (c *Connection) IndexStatus(indexList []string) (Response, error) {
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r := Request{
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Conn: c,
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IndexList: indexList,
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method: "GET",
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api: "_status",
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}
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return r.Run()
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}
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// Bulk adds multiple documents in bulk mode to the index for a given type
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func (c *Connection) BulkSend(index string, documents []Document) (Response, error) {
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// We do not generate a traditionnal JSON here (often a one liner)
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// Elasticsearch expects one line of JSON per line (EOL = \n)
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// plus an extra \n at the very end of the document
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//
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// More informations about the Bulk JSON format for Elasticsearch:
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//
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// - http://www.elasticsearch.org/guide/reference/api/bulk.html
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//
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// This is quite annoying for us as we can not use the simple JSON
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// Marshaler available in Run().
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//
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// We have to generate this special JSON by ourselves which leads to
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// the code below.
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//
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// I know it is unreadable I must find an elegant way to fix this.
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bulkData := []byte{}
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for _, doc := range documents {
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header := map[string]interface{}{
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doc.BulkCommand: map[string]interface{}{
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"_index": doc.Index,
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"_type": doc.Type,
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"_id": doc.Id,
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},
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}
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temp, err := json.Marshal(header)
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if err != nil {
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return Response{}, err
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}
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temp = append(temp, '\n')
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bulkData = append(bulkData, temp[:]...)
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if len(doc.Fields) > 0 {
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fields := map[string]interface{}{}
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for fieldName, fieldValue := range doc.Fields {
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fields[fieldName] = fieldValue
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}
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temp, err = json.Marshal(fields)
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if err != nil {
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return Response{}, err
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}
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temp = append(temp, '\n')
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bulkData = append(bulkData, temp[:]...)
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}
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}
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r := Request{
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Conn: c,
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IndexList: []string{index},
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method: "POST",
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api: "_bulk",
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bulkData: bulkData,
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}
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return r.Run()
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}
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// Search executes a search query against an index
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func (c *Connection) Search(query map[string]interface{}, indexList []string, typeList []string) (Response, error) {
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r := Request{
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Conn: c,
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Query: query,
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IndexList: indexList,
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TypeList: typeList,
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method: "POST",
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api: "_search",
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}
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return r.Run()
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}
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// Get a typed document by its id
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func (c *Connection) Get(index string, documentType string, id string, extraArgs url.Values) (Response, error) {
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r := Request{
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Conn: c,
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IndexList: []string{index},
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method: "GET",
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api: documentType + "/" + id,
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ExtraArgs: extraArgs,
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}
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return r.Run()
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}
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// Index indexes a Document
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// The extraArgs is a list of url.Values that you can send to elasticsearch as
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// URL arguments, for example, to control routing, ttl, version, op_type, etc.
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func (c *Connection) Index(d Document, extraArgs url.Values) (Response, error) {
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r := Request{
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Conn: c,
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Query: d.Fields,
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IndexList: []string{d.Index.(string)},
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TypeList: []string{d.Type},
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ExtraArgs: extraArgs,
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method: "POST",
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}
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if d.Id != nil {
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r.method = "PUT"
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r.id = d.Id.(string)
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}
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return r.Run()
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}
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// Delete deletes a Document d
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// The extraArgs is a list of url.Values that you can send to elasticsearch as
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// URL arguments, for example, to control routing.
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func (c *Connection) Delete(d Document, extraArgs url.Values) (Response, error) {
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r := Request{
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Conn: c,
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IndexList: []string{d.Index.(string)},
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TypeList: []string{d.Type},
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ExtraArgs: extraArgs,
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method: "DELETE",
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id: d.Id.(string),
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}
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return r.Run()
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}
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// Run executes an elasticsearch Request. It converts data to Json, sends the
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// request and return the Response obtained
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func (req *Request) Run() (Response, error) {
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postData := []byte{}
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// XXX : refactor this
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if req.api == "_bulk" {
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postData = req.bulkData
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} else {
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b, err := json.Marshal(req.Query)
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if err != nil {
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return Response{}, err
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}
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postData = b
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}
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reader := bytes.NewReader(postData)
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client := http.DefaultClient
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newReq, err := http.NewRequest(req.method, req.Url(), reader)
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if err != nil {
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return Response{}, err
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}
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if req.method == "POST" || req.method == "PUT" {
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newReq.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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}
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resp, err := client.Do(newReq)
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if err != nil {
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return Response{}, err
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return Response{}, err
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}
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if resp.StatusCode > 201 && resp.StatusCode < 400 {
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return Response{}, errors.New(string(body))
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}
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esResp := new(Response)
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err = json.Unmarshal(body, &esResp)
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if err != nil {
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return Response{}, err
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}
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if esResp.Error != "" {
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return Response{}, &SearchError{esResp.Error, esResp.Status}
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}
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return *esResp, nil
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}
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// Url builds a Request for a URL
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func (r *Request) Url() string {
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path := "/" + strings.Join(r.IndexList, ",")
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if len(r.TypeList) > 0 {
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path += "/" + strings.Join(r.TypeList, ",")
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}
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// XXX : for indexing documents using the normal (non bulk) API
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if len(r.api) == 0 && len(r.id) > 0 {
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path += "/" + r.id
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}
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path += "/" + r.api
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u := url.URL{
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Scheme: "http",
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Host: fmt.Sprintf("%s:%s", r.Conn.Host, r.Conn.Port),
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Path: path,
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RawQuery: r.ExtraArgs.Encode(),
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}
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return u.String()
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}
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