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views.go
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views.go
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package couchdb
import (
"context"
"fmt"
"net/http"
"net/url"
"reflect"
"time"
"github.com/cozy/cozy-stack/pkg/couchdb/mango"
"github.com/cozy/cozy-stack/pkg/logger"
"github.com/cozy/cozy-stack/pkg/prefixer"
"golang.org/x/sync/errgroup"
)
// View is the map/reduce thing in CouchDB
type View struct {
Name string `json:"-"`
Doctype string `json:"-"`
Map interface{} `json:"map"`
Reduce interface{} `json:"reduce,omitempty"`
Options interface{} `json:"options,omitempty"`
}
// DesignDoc is the structure if a _design doc containing views
type DesignDoc struct {
ID string `json:"_id,omitempty"`
Rev string `json:"_rev,omitempty"`
Lang string `json:"language"`
Views map[string]*View `json:"views"`
}
// IndexCreationResponse is the response from couchdb when we create an Index
type IndexCreationResponse struct {
Result string `json:"result,omitempty"`
Error string `json:"error,omitempty"`
Reason string `json:"reason,omitempty"`
ID string `json:"id,omitempty"`
Name string `json:"name,omitempty"`
}
// DefineViews creates a design doc with some views
func DefineViews(g *errgroup.Group, db prefixer.Prefixer, views []*View) {
for i := range views {
view := views[i]
g.Go(func() error {
return DefineView(db, view)
})
}
}
// DefineView ensure that a view exists, or creates it.
func DefineView(db prefixer.Prefixer, v *View) error {
id := "_design/" + v.Name
url := url.PathEscape(id)
doc := &DesignDoc{
ID: id,
Lang: "javascript",
Views: map[string]*View{v.Name: v},
}
err := makeRequest(db, v.Doctype, http.MethodPut, url, &doc, nil)
if IsNoDatabaseError(err) {
err = CreateDB(db, v.Doctype)
if err != nil && !IsFileExists(err) {
if err != nil {
logger.WithDomain(db.DomainName()).
Infof("Cannot create view %s %s: cannot create DB - %s",
db.DBPrefix(), v.Doctype, err)
}
return err
}
err = makeRequest(db, v.Doctype, http.MethodPut, url, &doc, nil)
}
if IsConflictError(err) {
var old DesignDoc
err = makeRequest(db, v.Doctype, http.MethodGet, url, nil, &old)
if err != nil {
if err != nil {
logger.WithDomain(db.DomainName()).
Infof("Cannot create view %s %s: conflict - %s",
db.DBPrefix(), v.Doctype, err)
}
return err
}
if !equalViews(&old, doc) {
doc.Rev = old.Rev
err = makeRequest(db, v.Doctype, http.MethodPut, url, &doc, nil)
} else {
err = nil
}
}
if err != nil {
logger.WithDomain(db.DomainName()).
Infof("Cannot create view %s %s: %s", db.DBPrefix(), v.Doctype, err)
}
return err
}
// UpdateIndexesAndViews creates views and indexes that are missing or not
// up-to-date.
func UpdateIndexesAndViews(db prefixer.Prefixer, indexes []*mango.Index, views []*View) error {
g, _ := errgroup.WithContext(context.Background())
// Load the existing design docs
idsByDoctype := map[string][]string{}
for _, view := range views {
list := idsByDoctype[view.Doctype]
list = append(list, "_design/"+view.Name)
idsByDoctype[view.Doctype] = list
}
for _, index := range indexes {
list := idsByDoctype[index.Doctype]
list = append(list, "_design/"+index.Request.DDoc)
idsByDoctype[index.Doctype] = list
}
ddocsByDoctype := map[string][]*DesignDoc{}
for doctype, ids := range idsByDoctype {
req := &AllDocsRequest{Keys: ids, Limit: 10000}
results := []*DesignDoc{}
err := GetDesignDocs(db, doctype, req, &results)
if err != nil {
continue
}
ddocsByDoctype[doctype] = results
}
// Define views that don't exist
for i := range views {
view := views[i]
ddoc := &DesignDoc{
ID: "_design/" + view.Name,
Lang: "javascript",
Views: map[string]*View{view.Name: view},
}
exists := false
for _, old := range ddocsByDoctype[view.Doctype] {
if old != nil && equalViews(old, ddoc) {
exists = true
}
}
if exists {
continue
}
g.Go(func() error {
return DefineView(db, view)
})
}
// Define indexes that don't exist
for i := range indexes {
index := indexes[i]
ddoc := &DesignDoc{
ID: "_design/" + index.Request.DDoc,
Lang: "query",
}
exists := false
for _, old := range ddocsByDoctype[index.Doctype] {
if old == nil {
continue
}
name := "undefined"
for key := range old.Views {
name = key
}
mapFields := map[string]interface{}{}
defFields := []interface{}{}
for _, field := range index.Request.Index.Fields {
mapFields[field] = "asc"
defFields = append(defFields, field)
}
view := &View{
Name: name,
Doctype: index.Doctype,
Map: map[string]interface{}{
"fields": mapFields,
"partial_filter_selector": index.Request.Index.PartialFilter,
},
Reduce: "_count",
Options: map[string]interface{}{
"def": map[string]interface{}{
"fields": defFields,
},
},
}
ddoc.Views = map[string]*View{name: view}
if equalViews(old, ddoc) {
exists = true
}
}
if exists {
continue
}
g.Go(func() error {
return DefineIndex(db, index)
})
}
return g.Wait()
}
func equalViews(v1 *DesignDoc, v2 *DesignDoc) bool {
if v1.Lang != v2.Lang {
return false
}
if len(v1.Views) != len(v2.Views) {
return false
}
for name, view1 := range v1.Views {
view2, ok := v2.Views[name]
if !ok {
return false
}
if !reflect.DeepEqual(view1.Map, view2.Map) ||
!reflect.DeepEqual(view1.Reduce, view2.Reduce) ||
!reflect.DeepEqual(view1.Options, view2.Options) {
return false
}
}
return true
}
// ExecView executes the specified view function
func ExecView(db prefixer.Prefixer, view *View, req *ViewRequest, results interface{}) error {
viewurl := fmt.Sprintf("_design/%s/_view/%s", view.Name, view.Name)
if req.GroupLevel > 0 {
req.Group = true
}
v, err := req.Values()
if err != nil {
return err
}
viewurl += "?" + v.Encode()
if req.Keys != nil {
return makeRequest(db, view.Doctype, http.MethodPost, viewurl, req, &results)
}
err = makeRequest(db, view.Doctype, http.MethodGet, viewurl, nil, &results)
if IsInternalServerError(err) {
time.Sleep(1 * time.Second)
// Retry the error on 500, as it may be just that CouchDB is slow to build the view
err = makeRequest(db, view.Doctype, http.MethodGet, viewurl, nil, &results)
if IsInternalServerError(err) {
logger.
WithDomain(db.DomainName()).
WithNamespace("couchdb").
WithField("critical", "true").
Errorf("500 on requesting view: %s", err)
}
}
return err
}
// DefineIndexes defines a list of indexes.
func DefineIndexes(g *errgroup.Group, db prefixer.Prefixer, indexes []*mango.Index) {
for i := range indexes {
index := indexes[i]
g.Go(func() error { return DefineIndex(db, index) })
}
}
// DefineIndex define the index on the doctype database
// see query package on how to define an index
func DefineIndex(db prefixer.Prefixer, index *mango.Index) error {
_, err := DefineIndexRaw(db, index.Doctype, index.Request)
if err != nil {
logger.WithDomain(db.DomainName()).
Infof("Cannot create index %s %s: %s", db.DBPrefix(), index.Doctype, err)
}
return err
}
// DefineIndexRaw defines a index
func DefineIndexRaw(db prefixer.Prefixer, doctype string, index interface{}) (*IndexCreationResponse, error) {
url := "_index"
response := &IndexCreationResponse{}
err := makeRequest(db, doctype, http.MethodPost, url, &index, &response)
if IsNoDatabaseError(err) {
if err = CreateDB(db, doctype); err != nil && !IsFileExists(err) {
return nil, err
}
err = makeRequest(db, doctype, http.MethodPost, url, &index, &response)
}
// XXX when creating the same index twice at the same time, CouchDB respond
// with a 500, so let's just retry as a work-around...
if IsInternalServerError(err) {
time.Sleep(100 * time.Millisecond)
err = makeRequest(db, doctype, http.MethodPost, url, &index, &response)
}
if err != nil {
return nil, err
}
return response, nil
}