vain/cmd/vaind/main.go

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/*
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vaind, 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
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Assume an instance of vaind 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".
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*/
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package main
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import (
"fmt"
"log"
"net/http"
"os"
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"mcquay.me/vain"
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"github.com/kelseyhightower/envconfig"
)
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const usage = `vaind
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environment vars:
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VAIN_PORT: tcp listen port
VAIN_HOST: hostname to use
VAIN_DB: path to json database
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`
type config struct {
Port int
DB string
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}
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func main() {
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c := &config{
Port: 4040,
}
if err := envconfig.Process("vain", c); err != nil {
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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)
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}
}
if c.DB == "" {
log.Printf("warning: in-memory db mode; if you do not want this set VAIN_DB")
}
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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()
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ms := vain.NewSimpleStore(c.DB)
if err := ms.Load(); err != nil {
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log.Printf("unable to load db: %v; creating fresh database", err)
}
vain.NewServer(sm, ms)
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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)
}
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}