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deploy.go
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deploy.go
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//go:build !tinygo
package device
import (
"bytes"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"html/template"
"net/http"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/merliot/device/uf2"
)
func genFile(templates *template.Template, template string, name string,
values map[string]string) error {
tmpl := templates.Lookup(template)
if tmpl == nil {
return fmt.Errorf("Template '%s' not found", template)
}
file, err := os.Create(name)
if err != nil {
return err
}
defer file.Close()
return tmpl.Execute(file, values)
}
func (d *Device) serveFile(dir, filename string, w http.ResponseWriter, r *http.Request) error {
// Calculate MD5 checksum of installer
cmd := exec.Command("md5sum", filepath.Join(dir, filename))
fmt.Println(cmd.String())
stdoutStderr, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("%w: %s", err, stdoutStderr)
}
md5sum := bytes.Fields(stdoutStderr)[0]
md5sumBase64 := base64.StdEncoding.EncodeToString(md5sum)
// Set the Content-Disposition header to suggest the original filename for download
w.Header().Set("Content-Disposition", "attachment; filename="+filename)
// Set the MD5 checksum header
w.Header().Set("Content-MD5", md5sumBase64)
http.ServeFile(w, r, filepath.Join(dir, filename))
return nil
}
func (d *Device) deployGo(dir string, values map[string]string, envs []string,
templates *template.Template, w http.ResponseWriter, r *http.Request) error {
// Generate build.go from server.tmpl
if err := genFile(templates, "server.tmpl", filepath.Join(dir, "build.go"), values); err != nil {
return err
}
// Generate installer.go from installer.tmpl
if err := genFile(templates, "installer.tmpl", filepath.Join(dir, "installer.go"), values); err != nil {
return err
}
// Generate model.service from service.tmpl
if err := genFile(templates, "service.tmpl", filepath.Join(dir, d.Model+".service"), values); err != nil {
return err
}
// Generate model.conf from log.tmpl
if err := genFile(templates, "log.tmpl", filepath.Join(dir, d.Model+".conf"), values); err != nil {
return err
}
// Build build.go -> model (binary)
// substitute "-" for "_" in target, ala TinyGo, when using as tag
target := strings.Replace(values["target"], "-", "_", -1)
cmd := exec.Command("go", "build", "-ldflags", "-s -w", "-o", filepath.Join(dir, d.Model),
"-tags", target, filepath.Join(dir, "build.go"))
fmt.Println(cmd.String())
cmd.Env = append(cmd.Environ(), envs...)
stdoutStderr, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("%w: %s", err, stdoutStderr)
}
// Build installer and serve as download-able file
installer := d.Id + "-installer"
cmd = exec.Command("go", "build", "-ldflags", "-s -w", "-o", filepath.Join(dir, installer), filepath.Join(dir, "installer.go"))
fmt.Println(cmd.String())
cmd.Env = append(cmd.Environ(), envs...)
stdoutStderr, err = cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("%w: %s", err, stdoutStderr)
}
return d.serveFile(dir, installer, w, r)
}
/*
func (d *Device) deployTinyGo(dir string, values map[string]string, envs []string,
templates *template.Template, w http.ResponseWriter, r *http.Request) error {
// Generate build.go from runner.tmpl
if err := genFile(templates, "runner.tmpl", dir+"/build.go", values); err != nil {
return err
}
// Build build.go -> uf2 binary
installer := d.Id + "-installer.uf2"
target := values["target"]
cmd := exec.Command("tinygo", "build", "-target", target, "-stack-size", "8kb",
"-o", dir+"/"+installer, dir+"/build.go")
fmt.Println(cmd.String())
cmd.Env = append(cmd.Environ(), envs...)
stdoutStderr, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("%w: %s", err, stdoutStderr)
}
return d.serveFile(dir, installer, w, r)
}
*/
// Random string to embed in UF2 we can search for later to locate params
const UF2Magic = "Call the Doctor! Miss you Dan."
func (d *Device) deployTinyGoUF2(dir string, values map[string]string, envs []string,
templates *template.Template, w http.ResponseWriter, r *http.Request) error {
var p = params{
MagicStart: UF2Magic,
Ssid: values["ssid"],
Passphrase: values["passphrase"],
Id: values["id"],
Model: values["model"],
Name: values["name"],
DeployParams: values["deployParams"],
User: values["user"],
Passwd: values["passwd"],
DialURLs: values["dialUrls"],
MagicEnd: UF2Magic,
}
target := values["target"]
base := filepath.Join("uf2s", d.Model+"-"+target+".uf2")
installer := d.Id + "-installer.uf2"
// Re-write the base uf2 file and save as the installer uf2 file.
// The paramsMem area is replaced by json-encoded params.
uf2, err := uf2.Read(base)
if err != nil {
return err
}
oldBytes := bytes.Repeat([]byte{byte('x')}, 2048)
newBytes := make([]byte, 2048)
newParams, err := json.Marshal(p)
if err != nil {
return err
}
copy(newBytes, newParams)
uf2.ReplaceBytes(oldBytes, newBytes)
err = uf2.Write(filepath.Join(dir, installer))
if err != nil {
return err
}
return d.serveFile(dir, installer, w, r)
}
func (d *Device) buildValues(r *http.Request) (map[string]string, error) {
var values = make(map[string]string)
// Squash request params down to first value for each key. The resulting
// map[string]string is much nicer to pass to html/template as data value.
for k, v := range r.URL.Query() {
if len(v) > 0 {
values[k] = v[0]
}
}
values["deployParams"] = d.DeployParams
values["id"] = d.Id
values["model"] = d.Model
values["modelStruct"] = d.ModelStruct
values["name"] = d.Name
values["modulePath"] = d.Module.Path
if ssid, ok := values["ssid"]; ok {
values["passphrase"] = d.WifiAuth[ssid]
}
values["hub"] = d.WsScheme + r.Host + "/ws/?ping-period=4"
values["dialUrls"] = values["hub"] + "," + d.DialURLs
if user, passwd, ok := r.BasicAuth(); ok {
values["user"] = user
values["passwd"] = passwd
}
//fmt.Println(values)
return values, nil
}
func (d *Device) buildEnvs(values map[string]string) []string {
envs := []string{}
switch values["target"] {
case "demo", "x86-64":
envs = []string{"CGO_ENABLED=0", "GOOS=linux", "GOARCH=amd64"}
case "rpi":
// TODO: do we want more targets for GOARM=7|8?
envs = []string{"CGO_ENABLED=0", "GOOS=linux", "GOARCH=arm", "GOARM=5"}
}
return envs
}
func (d *Device) _deploy(templates *template.Template, w http.ResponseWriter, r *http.Request) error {
values, err := d.buildValues(r)
if err != nil {
return err
}
envs := d.buildEnvs(values)
// Create temp build directory
dir, err := os.MkdirTemp("./", d.Id+"-")
if err != nil {
return err
}
defer os.RemoveAll(dir)
//fmt.Println(dir)
switch values["target"] {
case "demo", "x86-64", "rpi":
return d.deployGo(dir, values, envs, templates, w, r)
case "nano-rp2040", "wioterminal", "pyportal":
//return d.deployTinyGo(dir, values, envs, templates, w, r)
return d.deployTinyGoUF2(dir, values, envs, templates, w, r)
default:
return errors.New("Target not supported")
}
return nil
}
func (d *Device) deploy(w http.ResponseWriter, r *http.Request) {
if d.Locked {
http.Error(w, "Refusing to download, device is locked", http.StatusLocked)
return
}
d.SetDeployParams(r.URL.RawQuery)
if err := d._deploy(d.templates, w, r); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
}