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elasticsearch-indexer.go
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elasticsearch-indexer.go
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package backends
import (
"bytes"
"encoding/json"
"fmt"
"math"
"net"
"net/http"
"strings"
"sync"
"time"
"github.com/ghetzel/go-stockutil/log"
"github.com/ghetzel/go-stockutil/maputil"
"github.com/ghetzel/go-stockutil/sliceutil"
"github.com/ghetzel/pivot/dal"
"github.com/ghetzel/pivot/filter"
"github.com/ghetzel/pivot/filter/generators"
)
var ElasticsearchBatchFlushCount = 1
var ElasticsearchBatchFlushInterval = 10 * time.Second
var ElasticsearchIdentityField = `_id`
var ElasticsearchDocumentType = `document`
var ElasticsearchRequestTimeout = 30 * time.Second
var ElasticsearchConnectTimeout = 3 * time.Second
var ElasticsearchTLSTimeout = 10 * time.Second
var ElasticsearchResponseHeaderTimeout = 10 * time.Second
type elasticsearchIndex struct {
Name string `json:"_index"`
Mappings map[string]interface{} `json:"mappings"`
Settings map[string]interface{} `json:"settings"`
}
type elasticsearchDocument struct {
Index string `json:"_index"`
Type string `json:"_type"`
ID interface{} `json:"_id"`
Version int `json:"_version"`
Score float64 `json:"_score"`
Found bool `json:"found"`
Source map[string]interface{} `json:"_source"`
}
type hits struct {
Hits []elasticsearchDocument `json:"hits"`
MaxScore float64 `json:"max_score"`
Total int64 `json:"total"`
}
type elasticsearchSearchResult struct {
Hits hits `json:"hits"`
TimedOut bool `json:"timed_out"`
Took int `json:"took"`
ScrollId string `json:"_scroll_id,omitempty"`
}
type elasticsearchScrollRequest struct {
ScrollLifetime string `json:"scroll"`
ScrollId string `json:"scroll_id"`
}
type bulkOpType string
const (
bulkIndex bulkOpType = `index`
bulkCreate = `create`
bulkDelete = `delete`
bulkUpdate = `update`
)
type bulkOperation struct {
Type bulkOpType
Index string
DocType string
ID interface{}
Payload map[string]interface{}
}
func (self *bulkOperation) GetBody() ([]map[string]interface{}, error) {
var rv []map[string]interface{}
if self.Index == `` {
return nil, fmt.Errorf("Index name is required for bulk operation")
}
if self.Type == `` {
return nil, fmt.Errorf("Document Type is required for bulk operation")
}
if self.ID == `` {
return nil, fmt.Errorf("ID is required for bulk operation")
}
// add the operation header, which is the same for all operation types
rv = append(rv, map[string]interface{}{
string(self.Type): map[string]interface{}{
`_index`: self.Index,
`_type`: self.Type,
`_id`: self.ID,
},
})
// perform operation-specific validation and additions
switch self.Type {
case bulkIndex, bulkCreate, bulkUpdate:
if len(self.Payload) == 0 {
return nil, fmt.Errorf("Bulk %v operation requires a payload", self.Type)
}
var payload map[string]interface{}
if self.Type == bulkUpdate {
payload = map[string]interface{}{
`doc`: self.Payload,
}
} else {
payload = self.Payload
}
// make sure these aren't in the document itself, as they are metadata
delete(payload, `_id`)
delete(payload, `_index`)
delete(payload, `_type`)
rv = append(rv, payload)
}
return rv, nil
}
type esDeferredBatch struct {
batch []bulkOperation
lastFlush time.Time
batchLock sync.Mutex
}
func (self *esDeferredBatch) Add(op bulkOperation) {
self.batchLock.Lock()
defer self.batchLock.Unlock()
self.batch = append(self.batch, op)
}
func (self *esDeferredBatch) Flush() ([]map[string]interface{}, error) {
var rv []map[string]interface{}
self.batchLock.Lock()
defer func() {
self.batch = nil
self.lastFlush = time.Now()
self.batchLock.Unlock()
}()
for _, op := range self.batch {
if body, err := op.GetBody(); err == nil {
rv = append(rv, body...)
} else {
return nil, err
}
}
return rv, nil
}
type ElasticsearchIndexer struct {
Indexer
conn *dal.ConnectionString
parent Backend
indexCache map[string]*elasticsearchIndex
indexDeferredBatch *esDeferredBatch
client *http.Client
}
func NewElasticsearchIndexer(connection dal.ConnectionString) *ElasticsearchIndexer {
return &ElasticsearchIndexer{
conn: &connection,
indexCache: make(map[string]*elasticsearchIndex),
indexDeferredBatch: new(esDeferredBatch),
client: &http.Client{
Timeout: ElasticsearchRequestTimeout,
Transport: &http.Transport{
Dial: (&net.Dialer{
Timeout: ElasticsearchConnectTimeout,
KeepAlive: 30 * time.Second,
}).Dial,
TLSHandshakeTimeout: ElasticsearchTLSTimeout,
ResponseHeaderTimeout: ElasticsearchResponseHeaderTimeout,
},
},
}
}
func (self *ElasticsearchIndexer) IndexConnectionString() *dal.ConnectionString {
return self.conn
}
func (self *ElasticsearchIndexer) IndexInitialize(parent Backend) error {
self.parent = parent
return nil
}
func (self *ElasticsearchIndexer) GetBackend() Backend {
return self.parent
}
func (self *ElasticsearchIndexer) IndexRetrieve(collection *dal.Collection, id interface{}) (*dal.Record, error) {
defer stats.NewTiming().Send(`pivot.indexers.elasticsearch.retrieve_time`)
if index, err := self.getIndexForCollection(collection); err == nil {
if req, err := self.newRequest(`GET`, fmt.Sprintf(
"/%v/%v/%v",
index.Name,
ElasticsearchDocumentType,
id,
), nil); err == nil {
if response, err := self.client.Do(req); err == nil {
if response.StatusCode < 400 {
var doc elasticsearchDocument
if err := json.NewDecoder(response.Body).Decode(&doc); err == nil {
return dal.NewRecord(doc.ID).SetFields(doc.Source), nil
} else {
return nil, fmt.Errorf("decode error: %v", err)
}
} else {
return nil, fmt.Errorf("%v", response.Status)
}
} else {
return nil, fmt.Errorf("response error: %v", err)
}
} else {
return nil, fmt.Errorf("request error: %v", err)
}
} else {
return nil, err
}
}
func (self *ElasticsearchIndexer) IndexExists(collection *dal.Collection, id interface{}) bool {
if _, err := self.IndexRetrieve(collection, id); err == nil {
return true
}
return false
}
func (self *ElasticsearchIndexer) Index(collection *dal.Collection, records *dal.RecordSet) error {
defer stats.NewTiming().Send(`pivot.indexers.elasticsearch.index_time`)
if index, err := self.getIndexForCollection(collection); err == nil {
for _, record := range records.Records {
querylog.Debugf("[%T] Adding %v to batch", self, record)
self.indexDeferredBatch.Add(bulkOperation{
Type: bulkIndex,
Index: index.Name,
DocType: ElasticsearchDocumentType,
ID: record.ID,
Payload: record.Fields,
})
}
self.checkAndFlushBatches(false)
return nil
} else {
return err
}
}
func (self *ElasticsearchIndexer) checkAndFlushBatches(forceFlush bool) {
if l := len(self.indexDeferredBatch.batch); l > 0 {
shouldFlush := false
if l >= ElasticsearchBatchFlushCount {
shouldFlush = true
}
if time.Since(self.indexDeferredBatch.lastFlush) >= ElasticsearchBatchFlushInterval {
shouldFlush = true
}
if forceFlush {
shouldFlush = true
}
if shouldFlush {
defer stats.NewTiming().Send(`pivot.indexers.elasticsearch.deferred_batch_flush`)
if bulkBody, err := self.indexDeferredBatch.Flush(); err == nil {
querylog.Debugf("[%T] Indexing %d records to %s", self, l)
if req, err := self.newRequest(`POST`, `/_bulk`, bulkBody); err == nil {
if response, err := self.client.Do(req); err == nil {
if response.StatusCode >= 400 {
log.Errorf("[%T] error indexing %d records: %v", self, l, response.Status)
}
} else {
log.Errorf("[%T] error indexing %d records: %v", self, l, err)
}
} else {
log.Errorf("[%T] error indexing %d records: %v", self, l, err)
}
} else {
log.Errorf("[%T] error indexing %d records: %v", self, l, err)
}
}
}
}
func (self *ElasticsearchIndexer) QueryFunc(collection *dal.Collection, f *filter.Filter, resultFn IndexResultFunc) error {
defer stats.NewTiming().Send(`pivot.indexers.elasticsearch.query_time`)
if f.IdentityField == `` {
f.IdentityField = ElasticsearchIdentityField
}
if index, err := self.getIndexForCollection(collection); err == nil {
originalLimit := f.Limit
originalOffset := f.Offset
useScrollApi := false
isFirstScrollRequest := true
lastScrollId := ``
// unbounded requests, or bounded ones exceeding 10k results, need to use the Scroll API
// see: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-scroll.html
if f.Limit == 0 || f.Limit > 10000 {
f.Limit = IndexerPageSize
useScrollApi = true
} else if f.Limit > IndexerPageSize {
f.Limit = IndexerPageSize
}
defer func() {
f.Offset = originalOffset
f.Limit = originalLimit
}()
page := 1
processed := 0
// perform requests until we have enough results or the index is out of them
for {
if query, err := filter.Render(
generators.NewElasticsearchGenerator(),
index.Name,
f,
); err == nil {
var req *http.Request
// build the search request; either the initial Scroll API query, Scroll paging query,
// or just a regular old Search API query.
if useScrollApi && isFirstScrollRequest {
if r, err := self.newRequest(`GET`, fmt.Sprintf("/%s/_search?scroll=1m", index.Name), string(query)); err == nil {
req = r
isFirstScrollRequest = false
} else {
return err
}
} else if useScrollApi {
if r, err := self.newRequest(`GET`, `/_search/scroll`, &elasticsearchScrollRequest{
ScrollLifetime: `1m`,
ScrollId: lastScrollId,
}); err == nil {
req = r
} else {
return err
}
} else {
if r, err := self.newRequest(`GET`, fmt.Sprintf("/%s/_search", index.Name), string(query)); err == nil {
req = r
} else {
return err
}
}
// perform request, read response
if response, err := self.client.Do(req); err == nil {
if response.StatusCode < 400 {
var searchResult elasticsearchSearchResult
if err := json.NewDecoder(response.Body).Decode(&searchResult); err == nil {
results := searchResult.Hits
lastScrollId = searchResult.ScrollId
querylog.Debugf("[%T] Got %d/%d results", self, len(results.Hits), results.Total)
if len(results.Hits) == 0 {
return nil
}
// totalPages = ceil(result count / page size)
totalPages := int(math.Ceil(float64(results.Total) / float64(f.Limit)))
if totalPages <= 0 {
totalPages = 1
}
// call the resultFn for each hit on this page
for _, hit := range results.Hits {
if err := resultFn(dal.NewRecord(hit.ID).SetFields(hit.Source), nil, IndexPage{
Page: page,
TotalPages: totalPages,
Limit: originalLimit,
Offset: f.Offset,
TotalResults: int64(results.Total),
}); err != nil {
return err
}
processed += 1
// if we have a limit set and we're at or beyond it
if originalLimit > 0 && processed >= originalLimit {
querylog.Debugf("[%T] %d at or beyond limit %d, returning results", self, processed, originalLimit)
return nil
}
}
// increment offset by the page size we just processed
page += 1
f.Offset += len(results.Hits)
// if the offset is now beyond the total results count
if int64(processed) >= results.Total {
querylog.Debugf("[%T] %d at or beyond total %d, returning results", self, processed, results.Total)
return nil
}
} else {
return err
}
} else {
var errbody map[string]interface{}
json.NewDecoder(response.Body).Decode(&errbody)
reason := strings.Join(
sliceutil.Stringify(
maputil.Pluck(maputil.DeepGet(errbody, []string{
`error`, `root_cause`,
}), []string{`reason`}),
),
`; `,
)
return fmt.Errorf("%v: %s", response.Status, sliceutil.Or(reason, `Unknown Error`))
}
} else {
return err
}
} else {
return err
}
}
} else {
return err
}
}
func (self *ElasticsearchIndexer) Query(collection *dal.Collection, f *filter.Filter, resultFns ...IndexResultFunc) (*dal.RecordSet, error) {
if f.IdentityField == `` {
f.IdentityField = ElasticsearchIdentityField
}
return DefaultQueryImplementation(self, collection, f, resultFns...)
}
func (self *ElasticsearchIndexer) IndexRemove(collection *dal.Collection, ids []interface{}) error {
if index, err := self.getIndexForCollection(collection); err == nil {
for _, id := range ids {
if req, err := self.newRequest(
`DELETE`,
fmt.Sprintf("/%v/%v/%v", index.Name, ElasticsearchDocumentType, id),
nil,
); err == nil {
self.client.Do(req)
}
}
return nil
} else {
return err
}
}
func (self *ElasticsearchIndexer) ListValues(collection *dal.Collection, fields []string, f *filter.Filter) (map[string][]interface{}, error) {
if _, err := self.getIndexForCollection(collection); err == nil {
return nil, fmt.Errorf("Not Implemented")
} else {
return nil, err
}
}
func (self *ElasticsearchIndexer) DeleteQuery(collection *dal.Collection, f *filter.Filter) error {
f.Fields = []string{ElasticsearchIdentityField}
var ids []interface{}
if err := self.QueryFunc(collection, f, func(indexRecord *dal.Record, err error, page IndexPage) error {
ids = append(ids, indexRecord.ID)
return nil
}); err == nil {
return self.parent.Delete(collection.Name, ids)
} else {
return err
}
}
func (self *ElasticsearchIndexer) FlushIndex() error {
self.checkAndFlushBatches(true)
return nil
}
func (self *ElasticsearchIndexer) newRequest(method string, urlpath string, body interface{}) (*http.Request, error) {
var buf bytes.Buffer
var lines []string
for _, item := range sliceutil.Sliceify(body) {
if str, ok := item.(string); ok {
// strings go through as-is
lines = append(lines, str)
} else if data, err := json.Marshal(item); err == nil {
// everything else gets jsonified
lines = append(lines, string(data))
} else {
return nil, err
}
}
buf.Write([]byte(strings.Join(lines, "\n")))
querylog.Debugf("[%T] %v %v %v", self, method, urlpath, body)
host := self.conn.Host()
protocol := sliceutil.Or(self.conn.Protocol(), `http`)
if req, err := http.NewRequest(
method,
fmt.Sprintf("%s://%s/%s", protocol, host, strings.Trim(urlpath, `/`)),
&buf,
); err == nil {
req.Header.Set(`Content-Type`, `application/json`)
return req, nil
} else {
return nil, err
}
}
func (self *ElasticsearchIndexer) getIndexForCollection(collection *dal.Collection) (*elasticsearchIndex, error) {
defer stats.NewTiming().Send(`pivot.indexers.elasticsearch.retrieve_index`)
name := collection.GetIndexName()
if v, ok := self.indexCache[name]; ok {
return v, nil
} else {
if req, err := self.newRequest(`GET`, fmt.Sprintf("/%s", name), nil); err == nil {
if response, err := self.client.Do(req); err == nil {
switch {
case response.StatusCode < 400:
var index elasticsearchIndex
if err := json.NewDecoder(response.Body).Decode(&index); err == nil {
index.Name = name
self.indexCache[name] = &index
return &index, nil
} else {
return nil, err
}
case response.StatusCode == 404:
return nil, fmt.Errorf("Index %v not found", name)
default:
return nil, err
}
} else {
return nil, err
}
} else {
return nil, err
}
}
}
func (self *ElasticsearchIndexer) useFilterMapping(index *elasticsearchIndex) {
// mappingImpl.AddCustomCharFilter(`remove_expression_tokens`, map[string]interface{}{
// `type`: regexp.Name,
// `regexp`: `[\:\[\]\*]+`,
// })
// mappingImpl.AddCustomAnalyzer(`pivot_filter`, map[string]interface{}{
// `type`: custom.Name,
// `char_filters`: []string{
// `remove_expression_tokens`,
// },
// `tokenizer`: single.Name,
// `token_filters`: []string{
// lowercase.Name,
// },
// })
// mappingImpl.DefaultAnalyzer = `pivot_filter`
}