vain/cmd/ysvd/main.go
stephen mcquay 501631a45a Don't require user to set YSV_HOST
The original reason for having this required configuration parameter was that
I didn't think to read the hostname off the request. Doing it this way has the
additional benefit of a single server being able to serve a multitude of
hostnames.

Derek helped me realize this by repeating "there should be sane defaults" like
9000 times (maybe over 9000) till I got so tired of trying to make sure that he
understood why I did it that way to begin with that I looked at the problem
from a different perspective and like in a dream the solution came to me.

fixes #10.
2016-02-16 23:22:33 -08:00

105 lines
2.4 KiB
Go

/*
ysvd, a webserver for hosting go get vanity urls.
The go get command searches for the following header when searching for
packages:
<meta name="go-import" content="import-prefix vcs repo-root">
this is simply a service for aggregating a collection of prefix, vcs, and
repo-root tuples, and serving the appropriate header over http. For more
information please refer to the documentation for the go tool found at
https://golang.org/cmd/go/#hdr-Remote_import_paths
API
Assume an instance of ysvd at example.org. In order to add a package
example.org/foo that points at bitbucket.org/example/foo (a mercurial
repository) POST the following json object:
{
"vcs": "mercurial",
"repo": "https://bitbucket.org/example/foo"
}
to https://example.org/foo.
Doing so, then visiting https://example.org/foo?go-get=1 will yield a header
that looks like:
<meta name="go-import" content="example.org/foo hg https://bitbucket.org/foo">
The json object sent to server can have two fields: "repo" and "vcs". "repo" is
required; leaving off the "vcs" member defaults to "git".
Naming
The "ysv" in ysvd stands for You're so Vain, the song by Carly Simon.
*/
package main
import (
"fmt"
"log"
"net/http"
"os"
"mcquay.me/vain"
"github.com/kelseyhightower/envconfig"
)
const usage = `ysvd
environment vars:
YSV_PORT: tcp listen port
YSV_HOST: hostname to use
YSV_DB: path to json database
`
type config struct {
Port int
DB string
}
func main() {
c := &config{
Port: 4040,
}
if err := envconfig.Process("ysv", c); err != nil {
fmt.Fprintf(os.Stderr, "problem processing environment: %v", err)
os.Exit(1)
}
if len(os.Args) > 1 {
switch os.Args[1] {
case "env", "e", "help", "h":
fmt.Printf("%s\n", usage)
os.Exit(0)
}
}
if c.DB == "" {
log.Printf("warning: in-memory db mode; if you do not want this set YSV_DB")
}
hostname := "localhost"
if hn, err := os.Hostname(); err != nil {
log.Printf("problem getting hostname:", err)
} else {
hostname = hn
}
log.Printf("serving at: http://%s:%d/", hostname, c.Port)
sm := http.NewServeMux()
ms := vain.NewSimpleStore(c.DB)
if err := ms.Load(); err != nil {
log.Printf("unable to load db: %v; creating fresh database", err)
}
vain.NewServer(sm, ms)
addr := fmt.Sprintf(":%d", c.Port)
if err := http.ListenAndServe(addr, sm); err != nil {
log.Printf("problem with http server: %v", err)
os.Exit(1)
}
}