initial commit

Signed-off-by: Christine Dodrill <me@christine.website>

.envrc

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+eval "$(lorri direnv)"

LICENSE

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+                                  YOLO LICENSE
+                             Version 1, July 10 2015
+
+THIS SOFTWARE LICENSE IS PROVIDED "ALL CAPS" SO THAT YOU KNOW IT IS SUPER
+SERIOUS AND YOU DON'T MESS AROUND WITH COPYRIGHT LAW BECAUSE YOU WILL GET IN
+TROUBLE HERE ARE SOME OTHER BUZZWORDS COMMONLY IN THESE THINGS WARRANTIES
+LIABILITY CONTRACT TORT LIABLE CLAIMS RESTRICTION MERCHANTABILITY SUBJECT TO
+THE FOLLOWING CONDITIONS:
+
+1. #yolo
+2. #swag
+3. #blazeit

README.md

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+# Aegis
+
+Relays information from services running over Unix sockets to Prometheus. Aegis
+contacts services (blades) over their Unix sockets when Prometheus asks for them.

aegis.txt

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+    =:::::::::~~=                        
+    :,:::::::,,:=                         
+    = +++++  + +=                        
+    :~+~~~~~~~===                        
+    :=+=~~~~~~=~=                        
+    =~:===~~~~~=~~=                        
+  =::~====~~~~=::::=                     
+  =: ++====~~~~==::=                     
+  =: -=+====~~~~~=~=                    
+  =~= ~++===~~~~=,~=                    
+    =~ +++==~~=:=~+=
+    ,= +++==~~=~++                      
+    := +++=+=~=~++                      
+    ,= ++++==~==++                       
+    ,~ ++++==~=+++                       
+    ,~ +++===~~==+                       
+    ,= ++====~~=++                       
+    ,= +==~===~==+                       
+    ,=+======~~==+                       
+    :=+=~~~~~~~=++                      
+    :===~~~~~~~+==                       
+    :~===~~~~~~=+=                      
+    ,~=~~~~~~~~===                       
+    ,~=~~~~~~~~+=~                       
+    ::+========+~=                       
+    +=~~~~~~~~~~~=                       

go.mod

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+module tulpa.dev/cadey/aegis
+
+go 1.16

main.go

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+package main
+
+import (
+	_ "embed"
+	"flag"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"os"
+	"path"
+	"path/filepath"
+)
+
+var (
+	hostport = flag.String("hostport", "[::]:31337", "TCP host:port to listen on")
+	sockdir  = flag.String("sockdir", "./run", "directory full of unix sockets to monitor")
+)
+
+//go:embed "aegis.txt"
+var core string
+
+func main() {
+	flag.Parse()
+
+	fmt.Print(core)
+	log.SetFlags(0)
+	log.Printf("%s -> %s", *hostport, *sockdir)
+
+	http.DefaultServeMux.HandleFunc("/", proxyToUnixSocket)
+
+	log.Fatal(http.ListenAndServe(*hostport, nil))
+}
+
+func proxyToUnixSocket(w http.ResponseWriter, r *http.Request) {
+	name := path.Base(r.URL.Path)
+
+	fname := filepath.Join(*sockdir, name+".sock")
+	_, err := os.Stat(fname)
+	if os.IsNotExist(err) {
+		http.NotFound(w, r)
+		return
+	}
+
+	ts := &http.Transport{
+		Dial: func(_, _ string) (net.Conn, error) {
+			return net.Dial("unix", fname)
+		},
+	}
+
+	rp := httputil.ReverseProxy{
+		Director: func(req *http.Request) {
+			req.URL.Scheme = "http"
+			req.URL.Host = "aegis"
+			req.URL.Path = "/metrics"
+			req.URL.RawPath = "/metrics"
+		},
+		Transport: ts,
+	}
+	rp.ServeHTTP(w, r)
+}

shell.nix

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+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    go gopls goimports
+
+    # keep this line if you use bash
+    pkgs.bashInteractive
+  ];
+}