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