From 02734a5b4ffc555a47c5029422ae4015b59c138f Mon Sep 17 00:00:00 2001 From: Franck Cuny Date: Thu, 12 Aug 2021 13:10:25 -0700 Subject: vanity: rewrite with templates and external config Rewrite the program to use external templates and load the configuration from an external source. We don't want to blindly send all the requests to some SCM since we want to support only some modules / program that way. There's two templates, one for requests coming from a browser, which list all the supported modules, and one for the `go get` command. For requests coming from `go get`, we generate a template that indicates where the repository is. The external configuration is in YAML, and list all the supported repositories, and the URL of the repository. It assumes a default VCS for all the modules (git in our case). --- tools/govanity/main.go | 130 ++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 108 insertions(+), 22 deletions(-) (limited to 'tools/govanity/main.go') diff --git a/tools/govanity/main.go b/tools/govanity/main.go index 4afe8d1..dd6d653 100644 --- a/tools/govanity/main.go +++ b/tools/govanity/main.go @@ -1,35 +1,121 @@ -package repo +package main import ( + "bytes" + "embed" + "flag" "html/template" + "io/ioutil" + "log" "net/http" + "strings" + + "gopkg.in/yaml.v3" ) +//go:embed templates +var tpls embed.FS + type repository struct { - Name string + Name string `yaml:"name"` + Repo string `yaml:"repo"` +} + +type config struct { + BaseUrl string `yaml:"baseUrl"` + VCS string `yaml:"vcs"` + Repositories []repository `yaml:"repositories"` +} + +type moduleTmpl struct { + Name string + Repo string + VCS string + BaseUrl string +} + +func main() { + flag.Parse() + buf, err := ioutil.ReadFile("vanity.yaml") + if err != nil { + log.Fatalf("failed to read the configuration: %+v", err) + } + + cfg := &config{} + err = yaml.Unmarshal(buf, cfg) + if err != nil { + log.Fatalf("failed to parse the YAML configuration: %+v", err) + } + + http.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(200) + w.Write([]byte("ok")) + }) + + http.HandleFunc("/", goGet(cfg)) + + log.Printf("starting web server on :8080") + log.Fatal(http.ListenAndServe(":8080", nil)) } -var vanityTemplate = template.Must(template.New("code").Parse(` - - - - - - - - - - -`)) - -func init() { - http.HandleFunc("/", handleTransactions) +func goGet(cfg *config) http.HandlerFunc { + return func(w http.ResponseWriter, r *http.Request) { + if r.Method != http.MethodGet { + status := http.StatusMethodNotAllowed + http.Error(w, http.StatusText(status), status) + return + } + + if r.FormValue("go-get") == "1" { + pathParts := strings.Split(r.URL.Path, "/") + for _, m := range cfg.Repositories { + if pathParts[1] == m.Name { + goGetModule(w, r, m, cfg) + return + } + } + status := http.StatusNotFound + http.Error(w, http.StatusText(status), status) + return + } + browserURL(w, r, cfg) + } } -func handleTransactions(w http.ResponseWriter, r *http.Request) { - repoName := r.URL.Path - p := &repository{Name: repoName} - if err := vanityTemplate.Execute(w, p); err != nil { - http.Error(w, err.Error(), http.StatusInternalServerError) +func goGetModule(w http.ResponseWriter, r *http.Request, m repository, cfg *config) { + tmpl, err := template.ParseFS(tpls, "templates/module.html.tpl") + if err != nil { + log.Fatal(err) + } + mod := moduleTmpl{ + VCS: cfg.VCS, + BaseUrl: cfg.BaseUrl, + Name: m.Name, + Repo: m.Repo, + } + var buf bytes.Buffer + if err := tmpl.Execute(&buf, mod); err != nil { + log.Printf("error: %+v", err) + status := http.StatusInternalServerError + http.Error(w, http.StatusText(status), status) + } else { + w.Header().Set("Cache-Control", "no-store") + w.Write(buf.Bytes()) + } +} + +func browserURL(w http.ResponseWriter, r *http.Request, cfg *config) { + tmpl, err := template.ParseFS(tpls, "templates/index.html.tpl") + if err != nil { + log.Fatal(err) + } + var buf bytes.Buffer + if err := tmpl.Execute(&buf, cfg); err != nil { + log.Printf("error: %+v", err) + status := http.StatusInternalServerError + http.Error(w, http.StatusText(status), status) + } else { + w.Header().Set("Cache-Control", "no-store") + w.Write(buf.Bytes()) } } -- cgit v1.2.3