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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
// Package config implements structures to store Nixery's configuration at
// runtime as well as the logic for instantiating this configuration from the
// environment.
package config
import (
"io/ioutil"
"log"
"os"
"cloud.google.com/go/storage"
)
// Load (optional) GCS bucket signing data from the GCS_SIGNING_KEY and
// GCS_SIGNING_ACCOUNT envvars.
func signingOptsFromEnv() *storage.SignedURLOptions {
path := os.Getenv("GCS_SIGNING_KEY")
id := os.Getenv("GCS_SIGNING_ACCOUNT")
if path == "" || id == "" {
log.Println("GCS URL signing disabled")
return nil
}
log.Printf("GCS URL signing enabled with account %q\n", id)
k, err := ioutil.ReadFile(path)
if err != nil {
log.Fatalf("Failed to read GCS signing key: %s\n", err)
}
return &storage.SignedURLOptions{
GoogleAccessID: id,
PrivateKey: k,
Method: "GET",
}
}
func getConfig(key, desc, def string) string {
value := os.Getenv(key)
if value == "" && def == "" {
log.Fatalln(desc + " must be specified")
} else if value == "" {
return def
}
return value
}
// config holds the Nixery configuration options.
type Config struct {
Bucket string // GCS bucket to cache & serve layers
Signing *storage.SignedURLOptions // Signing options to use for GCS URLs
Port string // Port on which to launch HTTP server
Pkgs PkgSource // Source for Nix package set
Timeout string // Timeout for a single Nix builder (seconds)
WebDir string // Directory with static web assets
PopUrl string // URL to the Nix package popularity count
}
func FromEnv() (*Config, error) {
pkgs, err := pkgSourceFromEnv()
if err != nil {
return nil, err
}
return &Config{
Bucket: getConfig("BUCKET", "GCS bucket for layer storage", ""),
Port: getConfig("PORT", "HTTP port", ""),
Pkgs: pkgs,
Signing: signingOptsFromEnv(),
Timeout: getConfig("NIX_TIMEOUT", "Nix builder timeout", "60"),
WebDir: getConfig("WEB_DIR", "Static web file dir", ""),
PopUrl: os.Getenv("NIX_POPULARITY_URL"),
}, nil
}
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