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/
queries.go
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/
queries.go
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// Copyright 2016-2018 Stratumn SAS. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package couchstore
import (
"encoding/json"
"fmt"
"github.com/stratumn/go-core/monitoring/errorcode"
"github.com/stratumn/go-core/store"
"github.com/stratumn/go-core/types"
)
// LinkSelector used in LinkQuery.
type LinkSelector struct {
ObjectType string `json:"docType"`
PrevLinkHash *PrevLinkHash `json:"linkWrapper.prevLinkHash,omitempty"`
Process string `json:"linkWrapper.link.meta.process.name,omitempty"`
MapIds *MapIdsIn `json:"linkWrapper.link.meta.mapId,omitempty"`
Step string `json:"linkWrapper.link.meta.step,omitempty"`
Tags *TagsAll `json:"linkWrapper.link.meta.tags,omitempty"`
LinkHash *LinkHashIn `json:"_id,omitempty"`
}
// LinkHashIn specifies the list of link hashes to search for
type LinkHashIn struct {
LinkHashes []string `json:"$in,omitempty"`
}
// MapIdsIn specifies that segment mapId should be in specified list
type MapIdsIn struct {
MapIds []string `json:"$in,omitempty"`
}
// TagsAll specifies all tags in specified list should be in segment tags
type TagsAll struct {
Tags []string `json:"$all,omitempty"`
}
// PrevLinkHash is used to specify PrevLinkHash in selector.
type PrevLinkHash struct {
Exists *bool `json:"$exists,omitempty"`
Equals string `json:"$eq"`
}
// LinkQuery used in CouchDB rich queries
type LinkQuery struct {
Selector LinkSelector `json:"selector,omitempty"`
Limit int `json:"limit,omitempty"`
Skip int `json:"skip,omitempty"`
Sort []map[string]string `json:"sort,omitempty"`
}
// CouchFindResponse is couchdb response type when posting to /db/_find
type CouchFindResponse struct {
Docs []*Document `json:"docs"`
}
func buildSortArgs(reverse bool) []map[string]string {
order := "desc"
if reverse {
order = "asc"
}
return []map[string]string{
map[string]string{
"linkWrapper.priority": order,
},
}
}
// NewSegmentQuery generates json data used to filter queries using couchdb _find api.
func NewSegmentQuery(filter *store.SegmentFilter) ([]byte, error) {
linkSelector := LinkSelector{}
linkSelector.ObjectType = objectTypeLink
if filter.WithoutParent {
linkSelector.PrevLinkHash = &PrevLinkHash{
Equals: "",
}
} else if len(filter.PrevLinkHash) > 0 {
linkSelector.PrevLinkHash = &PrevLinkHash{
Equals: filter.PrevLinkHash.String(),
}
}
if filter.Process != "" {
linkSelector.Process = filter.Process
}
if filter.Step != "" {
linkSelector.Step = filter.Step
}
if len(filter.MapIDs) > 0 {
linkSelector.MapIds = &MapIdsIn{MapIds: filter.MapIDs}
}
if len(filter.Tags) > 0 {
linkSelector.Tags = &TagsAll{Tags: filter.Tags}
}
if len(filter.LinkHashes) > 0 {
linkSelector.LinkHash = &LinkHashIn{}
for _, lh := range filter.LinkHashes {
linkSelector.LinkHash.LinkHashes = append(linkSelector.LinkHash.LinkHashes, lh.String())
}
}
linkQuery := LinkQuery{
Selector: linkSelector,
Limit: filter.Pagination.Limit,
Skip: filter.Pagination.Offset,
Sort: buildSortArgs(filter.Reverse),
}
b, err := json.Marshal(linkQuery)
if err != nil {
return b, types.WrapError(err, errorcode.InvalidArgument, store.Component, "json.Marshal")
}
return b, nil
}
// MapSelector used in MapQuery.
type MapSelector struct {
ObjectType string `json:"docType"`
Process string `json:"process,omitempty"`
MapIds *MapIdsFilters `json:"_id,omitempty"`
}
// MapIdsFilters contain the filters on the segment map ID.
// MapIdsFilters.And is a list of MapIdsFilter.
type MapIdsFilters struct {
Filters []MapIdsFilter `json:"$and,omitempty"`
}
// MapIdsFilter specifies that segment mapId should match a given regex.
type MapIdsFilter struct {
MapIdsMatch string `json:"$regex,omitempty"`
}
// MapQuery used in CouchDB rich queries.
type MapQuery struct {
Selector MapSelector `json:"selector,omitempty"`
Limit int `json:"limit,omitempty"`
Skip int `json:"skip,omitempty"`
}
// NewMapQuery generates json data used to filter queries using couchdb _find api.
func NewMapQuery(filter *store.MapFilter) ([]byte, error) {
mapSelector := MapSelector{}
mapSelector.ObjectType = objectTypeMap
mapSelector.Process = filter.Process
mapIdsFilters := &MapIdsFilters{Filters: []MapIdsFilter{}}
if filter.Prefix != "" {
mapIdsFilters.Filters = append(
mapIdsFilters.Filters,
MapIdsFilter{MapIdsMatch: fmt.Sprintf("^%s", filter.Prefix)},
)
}
if filter.Suffix != "" {
mapIdsFilters.Filters = append(
mapIdsFilters.Filters,
MapIdsFilter{MapIdsMatch: fmt.Sprintf("%s$", filter.Suffix)},
)
}
if len(mapIdsFilters.Filters) > 0 {
mapSelector.MapIds = mapIdsFilters
}
mapQuery := MapQuery{
Selector: mapSelector,
Limit: filter.Pagination.Limit,
Skip: filter.Pagination.Offset,
}
b, err := json.Marshal(mapQuery)
if err != nil {
return b, types.WrapError(err, errorcode.InvalidArgument, store.Component, "json.Marshal")
}
return b, nil
}