start putting index in a file

auto

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+while true; do
+    find . -type f -not -name modularium \
+        | grep -v '.git' \
+        | entr -c -d -r ./devloop
+    sleep 0.25
+done
+

devloop

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -e
+
+/home/jordan/code/go/bin/go test
+/home/jordan/code/go/bin/go build
+./modularium serve

handler.go

@@ -62,19 +62,30 @@ func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	switch r.URL.Path {
 	case "/fart":
+		// Step 1: a request comes in at orel.li. This page contains a meta tag
+		// indicating where the package contents may be found, and which backend
+		// is serving the package.
 		serveFile(w, "meta/fart/root.html")
 	case "/modules/orel.li/fart/@v/list":
+		// Step 2: list all of the versions for the package. Versions may be
+		// available but unlisted.
 		serveFile(w, "meta/fart/version-list")
 	case "/modules/orel.li/fart/@latest",
 		"/modules/orel.li/fart/@v/v0.0.3.info":
+		// Step 3: get info for the version, which is just a timestamp at the
+		// moment.
 		e := json.NewEncoder(w)
 		e.Encode(versionInfo{
 			Version: "v0.0.3",
 			Time:    time.Now(),
 		})
 	case "/modules/orel.li/fart/@v/v0.0.3.mod":
+		// Step 4: retrieve the modfile for the package, informing go mod of
+		// any transitive dependencies.
 		serveFile(w, "meta/fart/modfile")
 	case "/modules/orel.li/fart/@v/v0.0.3.zip":
+		// Step 5: retrieve the source code contents for a package, as a
+		// specially-formatted zip file.
 		err := zip.CreateFromDir(w, module.Version{
 			Path:    "orel.li/fart",
 			Version: "v0.0.3",

index.json

@@ -1,11 +1,12 @@
 {
     "orel.li": {
         "fart": {
-			"list_versions": [
+			"listed": [
 				"0.0.1",
 				"0.0.2",
 				"0.0.3"
-			]
+			],
+			"latest": "0.0.3"
         }
     }
 }

internal/index/domain.go

@@ -0,0 +1,5 @@
+package index
+
+type Domain struct {
+	Packages map[string][]Version `json:"packages"`
+}

internal/index/index.go

@@ -0,0 +1,24 @@
+package index
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+// Index maps package path roots to their domains
+type Index map[string]Domain
+
+func Load(path string) (Index, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load index at path %q: %w", path, err)
+	}
+	defer f.Close()
+
+	var i Index
+	if err := json.NewDecoder(f).Decode(&i); err != nil {
+		return nil, fmt.Errorf("failed to parse index file at %q: %w", path, err)
+	}
+	return i, nil
+}

internal/index/json.go

@@ -0,0 +1 @@
+package index

internal/index/root.go

@@ -0,0 +1,5 @@
+package index
+
+type Root struct {
+	Path string
+}

internal/index/version.go

@@ -0,0 +1,4 @@
+package index
+
+type Version struct {
+}

main.go

@@ -9,6 +9,7 @@ import (
 	"os"
 	"os/signal"
 
+	"orel.li/modularium/internal/index"
 	"orel.li/modularium/internal/ref"
 )
 
@@ -47,19 +48,25 @@ func main() {
 
 	switch root.Arg(0) {
 	case "serve":
-		path := "/var/run/orel.li/http.sock"
+		path := "./modularium.sock"
-		index := pathArg{path: "./modules-index.json"}
+		indexPath := pathArg{path: "./modules-index.json"}
 		h := handler{
 			path:  ref.New(&path),
-			index: ref.New(&index),
+			index: ref.New(&indexPath),
 		}
 
 		serveFlags := flag.NewFlagSet("serve", flag.ExitOnError)
 		serveFlags.StringVar(&path, "l", path, "path for a unix domain socket to listen on")
 
-		serveFlags.Var(&index, "index", "an index config")
+		serveFlags.Var(&indexPath, "index", "an index config")
 		serveFlags.Parse(root.Args()[1:])
 
+		idx, err := index.Load(indexPath.path)
+		if err != nil {
+			shutdown(err)
+		}
+		log_info.Printf("index: %v", idx)
+
 		if err := h.run(); err != nil {
 			bail(1, err.Error())
 		}

modules-index.json

@@ -0,0 +1,4 @@
+{
+	"orel.li": {}
+}
+