xesite/cmd/site/main.go

296 lines
8.2 KiB
Go

package main
import (
"context"
"html/template"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"sort"
"strings"
"sync"
"time"
"christine.website/internal/front"
"christine.website/internal/jsonfeed"
"github.com/gorilla/feeds"
"github.com/povilasv/prommod"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
blackfriday "github.com/russross/blackfriday"
"github.com/snabb/sitemap"
"within.website/ln"
)
var port = os.Getenv("PORT")
var (
requestCounter = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "handler_requests_total",
Help: "Total number of request/responses by HTTP status code.",
}, []string{"handler", "code"})
requestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Name: "handler_request_duration",
Help: "Handler request duration.",
}, []string{"handler", "method"})
requestInFlight = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Name: "handler_requests_in_flight",
Help: "Current number of requests being served.",
}, []string{"handler"})
)
func init() {
prometheus.Register(requestCounter)
prometheus.Register(requestDuration)
prometheus.Register(requestInFlight)
}
func middlewareMetrics(family string, next http.Handler) http.Handler {
return promhttp.InstrumentHandlerDuration(
requestDuration.MustCurryWith(prometheus.Labels{"handler": family}),
promhttp.InstrumentHandlerCounter(requestCounter.MustCurryWith(prometheus.Labels{"handler": family}),
promhttp.InstrumentHandlerInFlight(requestInFlight.With(prometheus.Labels{"handler": family}), next),
),
)
}
func main() {
if port == "" {
port = "29384"
}
prometheus.Register(prommod.NewCollector("christine"))
s, err := Build()
if err != nil {
ln.FatalErr(context.Background(), err, ln.Action("Build"))
}
ln.Log(context.Background(), ln.F{"action": "http_listening", "port": port})
http.ListenAndServe(":"+port, s)
}
// Site is the parent object for https://christine.website's backend.
type Site struct {
Posts Posts
Resume template.HTML
rssFeed *feeds.Feed
jsonFeed *jsonfeed.Feed
mux *http.ServeMux
sitemap []byte
templates map[string]*template.Template
tlock sync.RWMutex
}
func (s *Site) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ln.Log(r.Context(), ln.F{"action": "Site.ServeHTTP", "user_ip_address": r.RemoteAddr, "path": r.RequestURI})
s.mux.ServeHTTP(w, r)
}
var arbDate = time.Date(2019, time.March, 21, 18, 0, 0, 0, time.UTC)
// Build creates a new Site instance or fails.
func Build() (*Site, error) {
type postFM struct {
Title string
Date string
}
smi := sitemap.New()
smi.Add(&sitemap.URL{
Loc: "https://christine.website/resume",
LastMod: &arbDate,
ChangeFreq: sitemap.Monthly,
})
smi.Add(&sitemap.URL{
Loc: "https://christine.website/contact",
LastMod: &arbDate,
ChangeFreq: sitemap.Monthly,
})
smi.Add(&sitemap.URL{
Loc: "https://christine.website/",
LastMod: &arbDate,
ChangeFreq: sitemap.Monthly,
})
smi.Add(&sitemap.URL{
Loc: "https://christine.website/blog",
LastMod: &arbDate,
ChangeFreq: sitemap.Weekly,
})
s := &Site{
rssFeed: &feeds.Feed{
Title: "Christine Dodrill's Blog",
Link: &feeds.Link{Href: "https://christine.website/blog"},
Description: "My blog posts and rants about various technology things.",
Author: &feeds.Author{Name: "Christine Dodrill", Email: "me@christine.website"},
Created: bootTime,
Copyright: "This work is copyright Christine Dodrill. My viewpoints are my own and not the view of any employer past, current or future.",
},
jsonFeed: &jsonfeed.Feed{
Version: jsonfeed.CurrentVersion,
Title: "Christine Dodrill's Blog",
HomePageURL: "https://christine.website",
FeedURL: "https://christine.website/blog.json",
Description: "My blog posts and rants about various technology things.",
UserComment: "This is a JSON feed of my blogposts. For more information read: https://jsonfeed.org/version/1",
Icon: icon,
Favicon: icon,
Author: jsonfeed.Author{
Name: "Christine Dodrill",
Avatar: icon,
},
},
mux: http.NewServeMux(),
templates: map[string]*template.Template{},
}
err := filepath.Walk("./blog/", func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
fin, err := os.Open(path)
if err != nil {
return err
}
defer fin.Close()
content, err := ioutil.ReadAll(fin)
if err != nil {
return err
}
var fm postFM
remaining, err := front.Unmarshal(content, &fm)
if err != nil {
return err
}
output := blackfriday.Run(remaining)
p := &Post{
Title: fm.Title,
Date: fm.Date,
Link: strings.Split(path, ".")[0],
Body: string(remaining),
BodyHTML: template.HTML(output),
}
s.Posts = append(s.Posts, p)
itime, _ := time.Parse("2006-01-02", p.Date)
smi.Add(&sitemap.URL{
Loc: "https://christine.website/" + p.Link,
LastMod: &itime,
ChangeFreq: sitemap.Monthly,
})
return nil
})
if err != nil {
return nil, err
}
sort.Sort(sort.Reverse(s.Posts))
resumeData, err := ioutil.ReadFile("./static/resume/resume.md")
if err != nil {
return nil, err
}
s.Resume = template.HTML(blackfriday.Run(resumeData))
for _, item := range s.Posts {
itime, _ := time.Parse("2006-01-02", item.Date)
s.rssFeed.Items = append(s.rssFeed.Items, &feeds.Item{
Title: item.Title,
Link: &feeds.Link{Href: "https://christine.website/" + item.Link},
Description: item.Summary,
Created: itime,
})
s.jsonFeed.Items = append(s.jsonFeed.Items, jsonfeed.Item{
ID: "https://christine.website/" + item.Link,
URL: "https://christine.website/" + item.Link,
Title: item.Title,
DatePublished: itime,
ContentHTML: string(item.BodyHTML),
})
}
// Add HTTP routes here
s.mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
w.WriteHeader(http.StatusNotFound)
s.renderTemplatePage("error.html", "can't find "+r.URL.Path).ServeHTTP(w, r)
return
}
s.renderTemplatePage("index.html", nil).ServeHTTP(w, r)
})
s.mux.HandleFunc("/.within/health", func(w http.ResponseWriter, r *http.Request) {
http.Error(w, "OK", http.StatusOK)
})
s.mux.Handle("/metrics", promhttp.Handler())
s.mux.Handle("/resume", middlewareMetrics("resume", s.renderTemplatePage("resume.html", s.Resume)))
s.mux.Handle("/blog", middlewareMetrics("blog", s.renderTemplatePage("blogindex.html", s.Posts)))
s.mux.Handle("/contact", middlewareMetrics("contact", s.renderTemplatePage("contact.html", nil)))
s.mux.Handle("/blog.rss", middlewareMetrics("blog.rss", http.HandlerFunc(s.createFeed)))
s.mux.Handle("/blog.atom", middlewareMetrics("blog.atom", http.HandlerFunc(s.createAtom)))
s.mux.Handle("/blog.json", middlewareMetrics("blog.json", http.HandlerFunc(s.createJsonFeed)))
s.mux.Handle("/blog/", middlewareMetrics("blogpost", http.HandlerFunc(s.showPost)))
s.mux.Handle("/css/", http.FileServer(http.Dir(".")))
s.mux.Handle("/static/", http.FileServer(http.Dir(".")))
s.mux.HandleFunc("/sw.js", func(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, "./static/js/sw.js")
})
s.mux.HandleFunc("/robots.txt", func(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, "./static/robots.txt")
})
s.mux.Handle("/sitemap.xml", middlewareMetrics("sitemap", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/xml")
smi.WriteTo(w)
})))
return s, nil
}
const icon = "https://christine.website/static/img/avatar.png"
// Post is a single blogpost.
type Post struct {
Title string `json:"title"`
Link string `json:"link"`
Summary string `json:"summary,omitifempty"`
Body string `json:"-"`
BodyHTML template.HTML `json:"body"`
Date string `json:"date"`
}
// Posts implements sort.Interface for a slice of Post objects.
type Posts []*Post
func (p Posts) Len() int { return len(p) }
func (p Posts) Less(i, j int) bool {
iDate, _ := time.Parse("2006-01-02", p[i].Date)
jDate, _ := time.Parse("2006-01-02", p[j].Date)
return iDate.Unix() < jDate.Unix()
}
func (p Posts) Swap(i, j int) { p[i], p[j] = p[j], p[i] }