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news_v2.go
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news_v2.go
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package controllers
import (
"context"
"net/http"
"runtime"
"sync"
"github.com/gin-gonic/gin"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"twreporter.org/go-api/internal/news"
)
type newsV2Storage interface {
GetFullPosts(context.Context, *news.Query) ([]news.Post, error)
GetMetaOfPosts(context.Context, *news.Query) ([]news.MetaOfPost, error)
GetFullTopics(context.Context, *news.Query) ([]news.Topic, error)
GetMetaOfTopics(context.Context, *news.Query) ([]news.MetaOfTopic, error)
GetPostCount(context.Context, *news.Query) (int, error)
GetTopicCount(context.Context, *news.Query) (int, error)
}
func NewNewsV2Controller(s newsV2Storage) *newsV2Controller {
return &newsV2Controller{s}
}
type newsV2Controller struct {
Storage newsV2Storage
}
func (nc *newsV2Controller) GetPosts(c *gin.Context) {
var err error
defer func() {
if err != nil {
nc.helperCleanup(c, err)
}
}()
q := news.ParsePostListQuery(c)
// TODO(babygoat): config context with proper timeout
posts, err := nc.Storage.GetMetaOfPosts(c, q)
if err != nil {
return
}
// TODO(babygoat): config context with proper timeout
total, err := nc.Storage.GetPostCount(c, q)
if err != nil {
return
}
c.JSON(http.StatusOK, gin.H{"status": "success", "data": gin.H{"records": posts, "meta": gin.H{
"total": total,
"offset": q.Offset,
"limit": q.Limit,
}}})
}
func (nc *newsV2Controller) GetAPost(c *gin.Context) {
var post interface{}
var err error
defer func() {
if err != nil {
nc.helperCleanup(c, err)
}
}()
q := news.ParseSinglePostQuery(c)
if q.Full {
var posts []news.Post
// TODO(babygoat): config context with proper timeout
posts, err = nc.Storage.GetFullPosts(c, q)
if len(posts) > 0 {
post = posts[0]
}
} else {
var posts []news.MetaOfPost
// TODO(babygoat): config context with proper timeout
posts, err = nc.Storage.GetMetaOfPosts(c, q)
if len(posts) > 0 {
post = posts[0]
}
}
if err != nil {
return
}
if post == nil {
c.JSON(http.StatusNotFound, gin.H{"status": "fail", "data": gin.H{"slug": "Cannot find the post from the slug"}})
return
}
c.JSON(http.StatusOK, gin.H{"status": "success", "data": post})
}
func (nc *newsV2Controller) GetTopics(c *gin.Context) {
var err error
defer func() {
if err != nil {
nc.helperCleanup(c, err)
}
}()
q := news.ParseTopicListQuery(c)
// TODO(babygoat): config context with proper timeout
topics, err := nc.Storage.GetMetaOfTopics(c, q)
if err != nil {
return
}
// TODO(babygoat): config context with proper timeout
total, err := nc.Storage.GetTopicCount(c, q)
if err != nil {
return
}
c.JSON(http.StatusOK, gin.H{"status": "success", "data": gin.H{"records": topics, "meta": gin.H{
"total": total,
"offset": q.Offset,
"limit": q.Limit,
}}})
}
func (nc *newsV2Controller) GetATopic(c *gin.Context) {
var topic interface{}
var err error
defer func() {
if err != nil {
nc.helperCleanup(c, err)
}
}()
q := news.ParseSingleTopicQuery(c)
if q.Full {
var topics []news.Topic
// TODO(babygoat): config context with proper timeout
topics, err = nc.Storage.GetFullTopics(c, q)
if len(topics) > 0 {
topic = topics[0]
}
} else {
var topics []news.MetaOfTopic
// TODO(babygoat): config context with proper timeout
topics, err = nc.Storage.GetMetaOfTopics(c, q)
if len(topics) > 0 {
topic = topics[0]
}
}
// server side error
if err != nil {
return
}
if topic == nil {
c.JSON(http.StatusNotFound, gin.H{"status": "fail", "data": gin.H{"slug": "Cannot find the topic from the slug"}})
return
}
c.JSON(http.StatusOK, gin.H{"status": "success", "data": topic})
}
type job struct {
Name string
Type string
Query *news.Query
}
type result struct {
Name string
Content interface{}
Error error
}
const (
typePost = "post"
typeTopic = "topic"
)
func (nc *newsV2Controller) GetIndexPage(c *gin.Context) {
// TODO(babygoat): config context with proper timeout
ctx := c
jobs := nc.getIndexPageJobs()
jobStream := nc.preparejobs(ctx, jobs)
workers := make([]<-chan result, runtime.NumCPU())
for i, _ := range workers {
workers[i] = nc.fetchjobs(ctx, jobStream)
}
var err error
results := make(map[string]interface{})
defer func() {
if err != nil {
nc.helperCleanup(c, err)
}
}()
for result := range nc.merge(ctx, workers...) {
select {
case <-ctx.Done():
err = errors.WithStack(ctx.Err())
break
default:
if result.Error != nil {
err = result.Error
break
}
results[result.Name] = result.Content
if len(results) == len(jobs) {
break
}
}
}
if err != nil {
return
}
c.JSON(http.StatusOK, gin.H{"status": "success", "data": gin.H{"records": results}})
}
func (nc *newsV2Controller) getIndexPageJobs() []job {
// v1 index page section jobs
jobs := []job{
{
Name: news.LatestSection,
Type: typePost,
Query: news.NewQuery(news.WithLimit(6)),
}, {
Name: news.EditorPicksSection,
Type: typePost,
Query: news.NewQuery(
news.WithFilterIsFeatured(true),
news.WithLimit(6),
news.WithSortUpdatedAt(false)),
}, {
Name: news.LatestTopicSection,
Type: typeTopic,
Query: news.NewQuery(news.WithLimit(1)),
}, {
Name: news.ReviewsSection,
Type: typePost,
Query: news.NewQuery(
news.WithFilterCategoryIDs(news.Review.ID),
news.WithLimit(4)),
}, {
Name: news.PhotoSection,
Type: typePost,
Query: news.NewQuery(
news.WithFilterCategoryIDs(news.Photography.ID),
news.WithLimit(6)),
}, {
Name: news.InfographicSection,
Type: typePost,
Query: news.NewQuery(news.WithFilterStyle("interactive"), news.WithLimit(6)),
}, {
Name: news.TopicsSection,
Type: typeTopic,
Query: news.NewQuery(news.WithOffset(1), news.WithLimit(4)),
},
}
// v1 categories in index page
jobs = append(jobs, func(categories ...news.Category) []job {
var jobs []job
for _, v := range categories {
jobs = append(jobs, job{
v.Name,
typePost,
news.NewQuery(news.WithFilterCategoryIDs(v.ID), news.WithLimit(1)),
})
}
return jobs
}(
news.HumanRightsAndSociety,
news.EnvironmentAndEducation,
news.PoliticsAndEconomy,
news.CultureAndArt,
news.International,
news.LivingAndMedicalCare,
)...)
return jobs
}
func (nc *newsV2Controller) preparejobs(ctx context.Context, jobs []job) <-chan job {
jobStream := make(chan job, len(jobs))
go func() {
defer close(jobStream)
for _, job := range jobs {
select {
case <-ctx.Done():
return
case jobStream <- job:
}
}
}()
return jobStream
}
func (nc *newsV2Controller) fetchjobs(ctx context.Context, jobStream <-chan job) <-chan result {
resultStream := make(chan result)
go func() {
defer close(resultStream)
for job := range jobStream {
select {
case <-ctx.Done():
return
default:
switch job.Type {
case typePost:
posts, err := nc.Storage.GetMetaOfPosts(ctx, job.Query)
result := result{
Name: job.Name,
Content: posts,
Error: err,
}
resultStream <- result
case typeTopic:
topics, err := nc.Storage.GetMetaOfTopics(ctx, job.Query)
result := result{
Name: job.Name,
Content: topics,
Error: err,
}
resultStream <- result
}
}
}
}()
return resultStream
}
func (nc *newsV2Controller) merge(ctx context.Context, resultStream ...<-chan result) <-chan result {
var wg sync.WaitGroup
wg.Add(len(resultStream))
fanIn := make(chan result)
multiplex := func(result <-chan result) {
defer wg.Done()
for r := range result {
select {
case <-ctx.Done():
return
case fanIn <- r:
}
}
}
for _, r := range resultStream {
go multiplex(r)
}
go func() {
defer close(fanIn)
wg.Wait()
}()
return fanIn
}
func (nc *newsV2Controller) helperCleanup(c *gin.Context, err error) {
if err != nil {
switch {
case errors.Is(err, context.DeadlineExceeded):
c.JSON(http.StatusGatewayTimeout, gin.H{"status": "error", "message": "Query upstream server timeout."})
default:
c.JSON(http.StatusInternalServerError, gin.H{"status": "error", "message": "Unexpected error."})
}
log.Errorf("%+v", err)
}
}