790bce219c
The filesystem storage backend can be enabled by setting `NIXERY_STORAGE_BACKEND` to `filesystem` and `STORAGE_PATH` to a disk location from which Nixery can serve files.
84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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// Package config implements structures to store Nixery's configuration at
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// runtime as well as the logic for instantiating this configuration from the
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// environment.
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package config
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import (
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"os"
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log "github.com/sirupsen/logrus"
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)
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func getConfig(key, desc, def string) string {
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value := os.Getenv(key)
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if value == "" && def == "" {
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log.WithFields(log.Fields{
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"option": key,
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"description": desc,
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}).Fatal("missing required configuration envvar")
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} else if value == "" {
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return def
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}
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return value
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}
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// Backend represents the possible storage backend types
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type Backend int
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const (
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GCS = iota
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FileSystem
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)
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// Config holds the Nixery configuration options.
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type Config struct {
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Port string // Port on which to launch HTTP server
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Pkgs PkgSource // Source for Nix package set
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Timeout string // Timeout for a single Nix builder (seconds)
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WebDir string // Directory with static web assets
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PopUrl string // URL to the Nix package popularity count
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Backend Backend // Storage backend to use for Nixery
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}
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func FromEnv() (Config, error) {
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pkgs, err := pkgSourceFromEnv()
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if err != nil {
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return Config{}, err
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}
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var b Backend
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switch os.Getenv("NIXERY_STORAGE_BACKEND") {
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case "gcs":
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b = GCS
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case "filesystem":
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b = FileSystem
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default:
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log.WithField("values", []string{
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"gcs",
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}).Fatal("NIXERY_STORAGE_BUCKET must be set to a supported value")
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}
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return Config{
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Port: getConfig("PORT", "HTTP port", ""),
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Pkgs: pkgs,
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Timeout: getConfig("NIX_TIMEOUT", "Nix builder timeout", "60"),
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WebDir: getConfig("WEB_DIR", "Static web file dir", ""),
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PopUrl: os.Getenv("NIX_POPULARITY_URL"),
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Backend: b,
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}, nil
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}
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