mirror of
https://github.com/benbusby/farside.git
synced 2025-03-15 11:46:32 -04:00
b5bad4defc
The project was rewritten from Elixir to Go, primarily because:
- I don't write Elixir anymore and don't want to maintain a project in a
language I no longer write
- I already write Go for other projects, including my day job, so it's
a safer bet for a project that I want to maintain long term
- Go allows me to build portable executables that will make it easier
for others to run farside on their own machines
The Go version of Farsside also has a built in task to fetch the latest
services{-full}.json file from the repo and ingest it, which makes
running a farside server a lot simpler.
It also automatically fetches the latest instance state from
https://farside.link unless configured as a primary farside node, which
will allow others to use farside without increasing traffic to all
instances that are queried by farside (just to the farside node itself).
139 lines
3.0 KiB
Go
139 lines
3.0 KiB
Go
package server
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import (
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_ "embed"
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"encoding/json"
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"html/template"
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"log"
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"net/http"
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"net/url"
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"os"
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"strings"
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"time"
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"github.com/benbusby/farside/db"
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"github.com/benbusby/farside/services"
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)
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//go:embed index.html
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var indexHTML string
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//go:embed route.html
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var routeHTML string
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type indexData struct {
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LastUpdated time.Time
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ServiceList []services.Service
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}
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type routeData struct {
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InstanceURL string
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}
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func home(w http.ResponseWriter, r *http.Request) {
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serviceList := db.GetServiceList()
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data := indexData{
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LastUpdated: db.LastUpdate,
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ServiceList: serviceList,
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}
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tmpl, err := template.New("").Parse(indexHTML)
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if err != nil {
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log.Println(err)
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http.Error(w, "Error parsing template", http.StatusInternalServerError)
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return
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}
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w.Header().Set("Content-Type", "text/html")
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err = tmpl.Execute(w, data)
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if err != nil {
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log.Println(err)
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http.Error(w, "Error executing template", http.StatusInternalServerError)
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}
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}
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func state(w http.ResponseWriter, r *http.Request) {
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storedServices := db.GetServiceList()
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jsonData, _ := json.Marshal(storedServices)
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w.Header().Set("Content-Type", "application/json")
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_, _ = w.Write(jsonData)
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}
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func baseRouting(w http.ResponseWriter, r *http.Request) {
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routing(w, r, false)
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}
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func jsRouting(w http.ResponseWriter, r *http.Request) {
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r.URL.Path = strings.Replace(r.URL.Path, "/_", "", 1)
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routing(w, r, true)
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}
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func routing(w http.ResponseWriter, r *http.Request, jsEnabled bool) {
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value := r.PathValue("routing")
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if len(value) == 0 {
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value = r.URL.Path
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}
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url, _ := url.Parse(value)
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path := strings.TrimPrefix(url.Path, "/")
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segments := strings.Split(path, "/")
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target, err := services.MatchRequest(segments[0])
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if err != nil {
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log.Printf("Error during match request: %v\n", err)
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http.Error(w, "No routing found for "+target, http.StatusBadRequest)
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return
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}
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instance, err := db.GetInstance(target)
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if err != nil {
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log.Printf("Error fetching instance from db: %v\n", err)
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http.Error(
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w,
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"Error fetching instance for "+target,
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http.StatusInternalServerError)
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return
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}
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if len(segments) > 1 {
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targetPath := strings.Join(segments[1:], "/")
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instance = instance + "/" + targetPath
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}
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w.Header().Set("Cache-Control", "no-store, no-cache, must-revalidate, max-age=0")
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w.Header().Set("Pragma", "no-cache")
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w.Header().Set("Expires", "0")
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if jsEnabled {
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data := routeData{
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InstanceURL: instance,
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}
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tmpl, _ := template.New("").Parse(routeHTML)
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w.Header().Set("Content-Type", "text/html")
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_ = tmpl.Execute(w, data)
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} else {
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http.Redirect(w, r, instance, http.StatusFound)
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}
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}
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func RunServer() {
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mux := http.NewServeMux()
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mux.HandleFunc("/{$}", home)
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mux.HandleFunc("/state/{$}", state)
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mux.HandleFunc("/{routing...}", baseRouting)
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mux.HandleFunc("/_/{routing...}", jsRouting)
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port := os.Getenv("FARSIDE_PORT")
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if len(port) == 0 {
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port = "4001"
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}
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log.Println("Starting server on http://localhost:" + port)
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err := http.ListenAndServe(":"+port, mux)
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if err != nil {
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log.Fatal(err)
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}
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}
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