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article_summary.go
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article_summary.go
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package schema
import (
"strings"
"github.com/Ptt-official-app/go-openbbsmiddleware/db"
"github.com/Ptt-official-app/go-openbbsmiddleware/types"
"github.com/Ptt-official-app/go-pttbbs/bbs"
"github.com/Ptt-official-app/go-pttbbs/ptttype"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
)
// ArticleSummary
type ArticleSummary struct {
// ArticleSummary
BBoardID bbs.BBoardID `bson:"bid"`
ArticleID bbs.ArticleID `bson:"aid"`
IsDeleted bool `bson:"deleted,omitempty"`
CreateTime types.NanoTS `bson:"create_time_nano_ts"`
MTime types.NanoTS `bson:"mtime_nano_ts"`
Recommend int `bson:"recommend"`
Owner bbs.UUserID `bson:"owner"`
FullTitle string `bson:"full_title"`
Title string `bson:"title"`
Money int `bson:"money"`
Class string `bson:"class"`
Filemode ptttype.FileMode `bson:"mode"`
Idx string `bson:"pttidx"`
UpdateNanoTS types.NanoTS `bson:"update_nano_ts"`
NComments int `bson:"n_comments,omitempty"` // n_comments is read-only in article-summary.
Rank int `bson:"rank,omitempty"` // 評價, read-only
SubjectType ptttype.SubjectType `bson:"subject_type"`
IsBottom bool `bson:"is_bottom"`
}
var (
EMPTY_ARTICLE_SUMMARY = &ArticleSummary{}
articleSummaryFields = getFields(EMPTY_ARTICLE, EMPTY_ARTICLE_SUMMARY)
)
func GetArticleSummary(bboardID bbs.BBoardID, articleID bbs.ArticleID) (result *ArticleSummary, err error) {
query := &ArticleQuery{
BBoardID: bboardID,
ArticleID: articleID,
}
result = &ArticleSummary{}
err = Article_c.FindOne(query, &result, articleSummaryFields)
if err == mongo.ErrNoDocuments {
return nil, nil
}
if err != nil {
return nil, err
}
return result, nil
}
func GetArticleSummariesByArticleIDs(articleIDs []bbs.ArticleID) (result []*ArticleSummary, err error) {
query := bson.M{
ARTICLE_ARTICLE_ID_b: bson.M{
"$in": articleIDs,
},
}
// find
err = Article_c.Find(query, 0, &result, articleSummaryFields, nil)
if err != nil {
return nil, err
}
return result, nil
}
func GetArticleSummariesByOwnerID(ownerID bbs.UUserID, startCreateTime types.NanoTS, descending bool, limit int) (result []*ArticleSummary, err error) {
// setup query
var query bson.M
if startCreateTime == 0 {
query = bson.M{
ARTICLE_OWNER_b: ownerID,
ARTICLE_IS_DELETED_b: bson.M{
"$exists": false,
},
}
} else {
theDir := "$gte"
if descending {
theDir = "$lte"
}
query = bson.M{
ARTICLE_OWNER_b: ownerID,
ARTICLE_CREATE_TIME_b: bson.M{
theDir: startCreateTime,
},
ARTICLE_IS_DELETED_b: bson.M{
"$exists": false,
},
}
}
// sort opts
var sortOpts bson.D
if descending {
sortOpts = bson.D{
{Key: ARTICLE_CREATE_TIME_b, Value: -1},
}
} else {
sortOpts = bson.D{
{Key: ARTICLE_CREATE_TIME_b, Value: 1},
}
}
// find
err = Article_c.Find(query, int64(limit), &result, articleSummaryFields, sortOpts)
if err != nil {
return nil, err
}
return result, nil
}
func GetBottomArticleSummaries(boardID bbs.BBoardID) (result []*ArticleSummary, err error) {
query := bson.M{
ARTICLE_BBOARD_ID_b: boardID,
ARTICLE_IS_BOTTOM_b: true,
}
sortOpts := bson.D{
{Key: ARTICLE_CREATE_TIME_b, Value: 1},
{Key: ARTICLE_ARTICLE_ID_b, Value: 1},
}
err = Article_c.Find(query, 0, &result, articleSummaryFields, sortOpts)
if err != nil {
return nil, err
}
return result, nil
}
func GetArticleSummaries(boardID bbs.BBoardID, startIdx string, descending bool, limit int) (result []*ArticleSummary, err error) {
var query bson.M
if startIdx == "" {
query = bson.M{
ARTICLE_BBOARD_ID_b: boardID,
}
} else {
theDir := "$gte"
if descending {
theDir = "$lte"
}
query = bson.M{
ARTICLE_BBOARD_ID_b: boardID,
ARTICLE_IDX_b: bson.M{
theDir: startIdx,
},
}
}
query[ARTICLE_IS_DELETED_b] = bson.M{
"$exists": false,
}
// sort opts
var sortOpts bson.D
if descending {
sortOpts = bson.D{
{Key: ARTICLE_IDX_b, Value: -1},
}
} else {
sortOpts = bson.D{
{Key: ARTICLE_IDX_b, Value: 1},
}
}
// find
err = Article_c.Find(query, int64(limit), &result, articleSummaryFields, sortOpts)
if err != nil {
return nil, err
}
return result, nil
}
func GetArticleSummariesByRegex(boardID bbs.BBoardID, keywordList []string, createNanoTS types.NanoTS, articleID bbs.ArticleID, descending bool, limit int) (result []*ArticleSummary, err error) {
result = make([]*ArticleSummary, 0, limit)
// keyword-list
runeList := make([][]rune, len(keywordList))
for idx, each := range keywordList {
runeList[idx] = []rune(each)
}
isToValidate := getArticleSummariesByRegexIsToValidate(runeList)
firstPattern, patternList := getArticleSummariesByRegexPatternList(boardID, runeList)
query := getArticleSummariesByRegexSetQuery(boardID, firstPattern, patternList, createNanoTS, articleID, descending)
// sort opts
var sortOpts bson.D
if descending {
sortOpts = bson.D{
{Key: ARTICLE_CREATE_TIME_b, Value: -1},
{Key: ARTICLE_ARTICLE_ID_b, Value: -1},
}
} else {
sortOpts = bson.D{
{Key: ARTICLE_CREATE_TIME_b, Value: 1},
{Key: ARTICLE_ARTICLE_ID_b, Value: 1},
}
}
nextCreateTS := createNanoTS
nextArticleID := articleID
isEndLoop := false
remaining := limit
for !isEndLoop && remaining > 0 {
// find
var eachResult []*ArticleSummary
err = Article_c.Find(query, int64(limit+1), &eachResult, articleSummaryFields, sortOpts)
if err != nil {
return nil, err
}
if len(eachResult) < limit+1 {
isEndLoop = true
} else {
nextArticleSummary := eachResult[limit]
eachResult = eachResult[:limit]
nextCreateTS = nextArticleSummary.CreateTime
nextArticleID = nextArticleSummary.ArticleID
}
validResult := eachResult
if isToValidate {
validResult = getArticleSummariesByRegexIsValidResult(eachResult, keywordList, runeList)
}
// append
if len(validResult) > remaining {
validResult = validResult[:remaining]
}
result = append(result, validResult...)
remaining -= len(validResult)
query = getArticleSummariesByRegexSetQuery(boardID, firstPattern, patternList, nextCreateTS, nextArticleID, descending)
}
return result, nil
}
func getArticleSummariesByRegexSetQuery(boardID bbs.BBoardID, firstPattern string, patternList bson.A, createNanoTS types.NanoTS, articleID bbs.ArticleID, descending bool) (query bson.M) {
if createNanoTS == 0 {
firstQuery := bson.M{
ARTICLE_BBOARD_ID_b: boardID,
ARTICLE_TITLE_REGEX_b: firstPattern,
ARTICLE_IS_DELETED_b: bson.M{
"$exists": false,
},
}
theList := make(bson.A, 0, len(patternList)+1)
theList = append(theList, firstQuery)
theList = append(theList, patternList...)
return bson.M{
"$and": theList,
}
}
theDir := "$gt"
if descending {
theDir = "$lt"
}
firstQuery := bson.M{
ARTICLE_BBOARD_ID_b: boardID,
ARTICLE_TITLE_REGEX_b: firstPattern,
ARTICLE_CREATE_TIME_b: bson.M{
theDir: createNanoTS,
},
ARTICLE_IS_DELETED_b: bson.M{
"$exists": false,
},
}
theList := make(bson.A, 0, len(patternList)+1)
theList = append(theList, firstQuery)
theList = append(theList, patternList...)
theDir2 := "$gte"
if descending {
theDir2 = "$lte"
}
secondQuery := bson.M{
ARTICLE_BBOARD_ID_b: boardID,
ARTICLE_TITLE_REGEX_b: firstPattern,
ARTICLE_CREATE_TIME_b: createNanoTS,
ARTICLE_ARTICLE_ID_b: bson.M{
theDir2: articleID,
},
ARTICLE_IS_DELETED_b: bson.M{
"$exists": false,
},
}
theList2 := make(bson.A, 0, len(patternList)+1)
theList2 = append(theList2, secondQuery)
theList2 = append(theList2, patternList...)
return bson.M{
"$or": bson.A{
bson.M{
"$and": theList,
},
bson.M{
"$and": theList2,
},
},
}
}
func getArticleSummariesByRegexIsToValidate(keywordList [][]rune) (isToValidate bool) {
for _, each := range keywordList {
if len(each) > TITLE_REGEX_N_GRAM {
return true
}
}
return false
}
func getArticleSummariesByRegexPatternList(boardID bbs.BBoardID, keywordList [][]rune) (firstPattern string, patternList bson.A) {
if len(keywordList) == 0 {
return "", nil
}
lenFirst := len(keywordList[0])
if lenFirst > TITLE_REGEX_N_GRAM {
lenFirst = TITLE_REGEX_N_GRAM
}
firstPattern = string(keywordList[0][:lenFirst])
patternList = make(bson.A, 0, len(keywordList)-1)
for _, each := range keywordList[1:] {
lenEach := len(each)
if lenEach > TITLE_REGEX_N_GRAM {
lenEach = TITLE_REGEX_N_GRAM
}
patternList = append(patternList, bson.M{ARTICLE_BBOARD_ID_b: boardID, ARTICLE_TITLE_REGEX_b: string(each[:lenEach])})
}
return firstPattern, patternList
}
// getArticleSummariesByRegexIsValidResult
//
// Assume:
func getArticleSummariesByRegexIsValidResult(articleSummaries []*ArticleSummary, keywordList []string, runeList [][]rune) (validArticleSummaries []*ArticleSummary) {
validArticleSummaries = make([]*ArticleSummary, 0, len(articleSummaries))
for _, each := range articleSummaries {
if getArticleSummariesByRegexIsValidTitle(each.Title, keywordList, runeList) {
validArticleSummaries = append(validArticleSummaries, each)
}
}
return validArticleSummaries
}
func getArticleSummariesByRegexIsValidTitle(title string, keywordList []string, runeList [][]rune) bool {
for idx, each := range runeList {
if len(each) <= TITLE_REGEX_N_GRAM {
continue
}
if !strings.Contains(title, keywordList[idx]) {
return false
}
}
return true
}
// NewARticleSummary
//
// no n_comments in bbs.ArticleSummary from backend.
func NewArticleSummary(a_b *bbs.ArticleSummary, updateNanoTS types.NanoTS) *ArticleSummary {
return &ArticleSummary{
BBoardID: a_b.BBoardID,
ArticleID: a_b.ArticleID,
IsDeleted: a_b.IsDeleted,
CreateTime: types.Time4ToNanoTS(a_b.CreateTime),
MTime: types.Time4ToNanoTS(a_b.MTime),
Recommend: int(a_b.Recommend),
Owner: a_b.Owner,
FullTitle: types.Big5ToUtf8(a_b.FullTitle),
Title: types.Big5ToUtf8(a_b.RealTitle),
Money: int(a_b.Money),
Class: types.Big5ToUtf8(a_b.Class),
Filemode: a_b.Filemode,
UpdateNanoTS: updateNanoTS,
Idx: a_b.Idx,
SubjectType: a_b.SubjectType,
}
}
func UpdateArticleSummaries(articleSummaries []*ArticleSummary, updateNanoTS types.NanoTS) (err error) {
if len(articleSummaries) == 0 {
return nil
}
// create items which do not exists yet.
theList := make([]*db.UpdatePair, len(articleSummaries))
for idx, each := range articleSummaries {
query := &ArticleQuery{
BBoardID: each.BBoardID,
ArticleID: each.ArticleID,
}
theList[idx] = &db.UpdatePair{
Filter: query,
Update: each,
}
}
r, err := Article_c.BulkCreateOnly(theList)
if err != nil {
return err
}
if r.UpsertedCount == int64(len(articleSummaries)) { // all are created
return nil
}
upsertedIDs := r.UpsertedIDs
updateArticleSummaries := make([]*db.UpdatePair, 0, len(theList))
for idx, each := range theList {
_, ok := upsertedIDs[int64(idx)]
if ok {
continue
}
origFilter := each.Filter.(*ArticleQuery)
filter := bson.M{
"$or": bson.A{
bson.M{
ARTICLE_BBOARD_ID_b: origFilter.BBoardID,
ARTICLE_ARTICLE_ID_b: origFilter.ArticleID,
ARTICLE_UPDATE_NANO_TS_b: bson.M{
"$exists": false,
},
ARTICLE_IS_DELETED_b: bson.M{"$exists": false},
},
bson.M{
ARTICLE_BBOARD_ID_b: origFilter.BBoardID,
ARTICLE_ARTICLE_ID_b: origFilter.ArticleID,
ARTICLE_UPDATE_NANO_TS_b: bson.M{
"$lt": updateNanoTS,
},
ARTICLE_IS_DELETED_b: bson.M{"$exists": false},
},
},
}
each.Filter = filter
updateArticleSummaries = append(updateArticleSummaries, each)
}
// update items with comparing update-nano-ts
_, err = Article_c.BulkUpdateOneOnly(updateArticleSummaries)
return err
}