initial httpgw: HTTP gateway for 9P file operations
This commit is contained in:
Levi Neely
parent
1d8e6c8df4
commit
ac79ebf733
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@ -0,0 +1,5 @@
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module ollie-httpgw
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go 1.25.6
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require 9fans.net/go v0.0.7
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@ -0,0 +1,34 @@
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9fans.net/go v0.0.7 h1:H5CsYJTf99C8EYAQr+uSoEJnLP/iZU8RmDuhyk30iSM=
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9fans.net/go v0.0.7/go.mod h1:Rxvbbc1e+1TyGMjAvLthGTyO97t+6JMQ6ly+Lcs9Uf0=
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dmitri.shuralyov.com/gpu/mtl v0.0.0-20201218220906-28db891af037/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
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github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
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github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
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golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56/go.mod h1:JhuoJpWY28nO4Vef9tZUw9qufEGTyX1+7lmHxV5q5G4=
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golang.org/x/exp v0.0.0-20210405174845-4513512abef3/go.mod h1:I6l2HNBLBZEcrOoCpyKLdY2lHoRZ8lI4x60KMCQDft4=
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golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
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golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
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golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
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golang.org/x/mobile v0.0.0-20201217150744-e6ae53a27f4f/go.mod h1:skQtrUTUwhdJvXM/2KKJzY8pDgNr9I/FOMqDVRPBUS4=
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golang.org/x/mobile v0.0.0-20210220033013-bdb1ca9a1e08/go.mod h1:skQtrUTUwhdJvXM/2KKJzY8pDgNr9I/FOMqDVRPBUS4=
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golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
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golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
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golang.org/x/mod v0.1.1-0.20191209134235-331c550502dd/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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golang.org/x/mod v0.3.1-0.20200828183125-ce943fd02449/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20210415045647-66c3f260301c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
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golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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golang.org/x/tools v0.0.0-20200117012304-6edc0a871e69/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
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golang.org/x/tools v0.0.0-20200207183749-b753a1ba74fa/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
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golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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@ -0,0 +1,226 @@
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// ollie-httpgw - HTTP gateway for the ollie 9P server.
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//
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// Maps HTTP methods to 9P file operations:
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//
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// GET /path - read file content or list directory entries
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// PUT /path - write request body to file
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// POST /path - create file (name = last path element)
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// DELETE /path - remove file
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// HEAD /path - stat file (metadata in headers)
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// PATCH /path - wstat (rename via JSON {"name": "newname"})
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package main
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import (
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"encoding/json"
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"flag"
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"fmt"
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"io"
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"log"
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"net/http"
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"path"
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"strings"
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"9fans.net/go/plan9"
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"9fans.net/go/plan9/client"
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)
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var (
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listen = flag.String("listen", ":8080", "HTTP listen address")
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service = flag.String("service", "ollie", "9P service name to connect to")
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network = flag.String("net", "", "network type (unix, tcp); empty = use namespace")
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addr = flag.String("addr", "", "9P server address; empty = use namespace service")
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)
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func main() {
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flag.Parse()
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http.HandleFunc("/", handler)
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log.Printf("ollie-httpgw listening on %s", *listen)
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log.Fatal(http.ListenAndServe(*listen, nil))
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}
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func dial() (*client.Fsys, error) {
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if *addr != "" {
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n := *network
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if n == "" {
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n = "tcp"
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}
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return client.Mount(n, *addr)
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}
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return client.MountService(*service)
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}
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type dirEntry struct {
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Name string `json:"name"`
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Size uint64 `json:"size"`
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Mode uint32 `json:"mode"`
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Mtime uint32 `json:"mtime"`
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IsDir bool `json:"is_dir"`
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}
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func dirToEntry(d *plan9.Dir) dirEntry {
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return dirEntry{
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Name: d.Name,
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Size: d.Length,
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Mode: uint32(d.Mode),
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Mtime: d.Mtime,
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IsDir: d.Mode&plan9.DMDIR != 0,
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}
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}
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func setStatHeaders(w http.ResponseWriter, d *plan9.Dir) {
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w.Header().Set("X-9p-Name", d.Name)
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w.Header().Set("X-9p-Size", fmt.Sprintf("%d", d.Length))
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w.Header().Set("X-9p-Mode", fmt.Sprintf("%o", d.Mode))
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w.Header().Set("X-9p-Mtime", fmt.Sprintf("%d", d.Mtime))
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if d.Mode&plan9.DMDIR != 0 {
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w.Header().Set("X-9p-Type", "dir")
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} else {
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w.Header().Set("X-9p-Type", "file")
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}
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}
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func handler(w http.ResponseWriter, r *http.Request) {
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fsys, err := dial()
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if err != nil {
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http.Error(w, "9p connect: "+err.Error(), http.StatusBadGateway)
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return
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}
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defer fsys.Close()
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p := strings.TrimPrefix(r.URL.Path, "/")
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switch r.Method {
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case http.MethodGet:
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handleRead(w, fsys, p)
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case http.MethodHead:
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handleStat(w, fsys, p)
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case http.MethodPut:
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handleWrite(w, r, fsys, p)
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case http.MethodPost:
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handleCreate(w, r, fsys, p)
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case http.MethodDelete:
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handleRemove(w, fsys, p)
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case http.MethodPatch:
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handleWstat(w, r, fsys, p)
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default:
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http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
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}
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}
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func handleRead(w http.ResponseWriter, fsys *client.Fsys, p string) {
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d, err := fsys.Stat(p)
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if err != nil {
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http.Error(w, err.Error(), http.StatusNotFound)
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return
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}
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setStatHeaders(w, d)
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if d.Mode&plan9.DMDIR != 0 {
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fid, err := fsys.Open(p, plan9.OREAD)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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defer fid.Close()
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dirs, err := fid.Dirreadall()
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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entries := make([]dirEntry, len(dirs))
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for i, de := range dirs {
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entries[i] = dirToEntry(de)
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(entries)
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return
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}
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fid, err := fsys.Open(p, plan9.OREAD)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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defer fid.Close()
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w.Header().Set("Content-Type", "application/octet-stream")
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io.Copy(w, fid)
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}
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func handleStat(w http.ResponseWriter, fsys *client.Fsys, p string) {
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d, err := fsys.Stat(p)
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if err != nil {
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http.Error(w, err.Error(), http.StatusNotFound)
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return
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}
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setStatHeaders(w, d)
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}
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func handleWrite(w http.ResponseWriter, r *http.Request, fsys *client.Fsys, p string) {
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body, err := io.ReadAll(r.Body)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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fid, err := fsys.Open(p, plan9.OWRITE)
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if err != nil {
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http.Error(w, err.Error(), http.StatusNotFound)
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return
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}
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n, err := fid.Write(body)
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fid.Close()
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(map[string]int{"bytes_written": n})
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}
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func handleCreate(w http.ResponseWriter, r *http.Request, fsys *client.Fsys, p string) {
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dir := path.Dir(p)
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name := path.Base(p)
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if dir == "." {
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dir = ""
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}
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body, err := io.ReadAll(r.Body)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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fid, err := fsys.Create(path.Join(dir, name), plan9.OWRITE, 0644)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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if len(body) > 0 {
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fid.Write(body)
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}
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fid.Close()
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w.WriteHeader(http.StatusCreated)
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}
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func handleRemove(w http.ResponseWriter, fsys *client.Fsys, p string) {
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if err := fsys.Remove(p); err != nil {
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http.Error(w, err.Error(), http.StatusNotFound)
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return
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}
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w.WriteHeader(http.StatusNoContent)
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}
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func handleWstat(w http.ResponseWriter, r *http.Request, fsys *client.Fsys, p string) {
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var req struct {
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Name string `json:"name"`
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}
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if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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d := &plan9.Dir{Name: req.Name}
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if err := fsys.Wstat(p, d); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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w.WriteHeader(http.StatusNoContent)
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}
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