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config.go
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config.go
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// Copyright 2019 The New York Times Company
//
// 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
//
// http://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 main
import (
"fmt"
"os"
"strconv"
)
// Config stores application configuration
type Config struct {
Concurrency int
DNSOverride string
Host string
PrintFailedTestsOnly bool
TestDirectory string
}
// FromEnv returns config read from environment variables
func FromEnv() (*Config, error) {
// Parse non-string values
concurrency, err := strconv.Atoi(getEnv("TEST_CONCURRENCY", "2"))
if err != nil {
return nil, fmt.Errorf("invalid concurrency value: %s", err)
}
if concurrency < 1 {
return nil, fmt.Errorf("invalid concurrency value: %d", concurrency)
}
printFailedOnly := false
if getEnv("TEST_PRINT_FAILED_ONLY", "false") == "true" {
printFailedOnly = true
}
return &Config{
Concurrency: concurrency,
Host: getEnv("TEST_HOST", ""),
DNSOverride: getEnv("TEST_DNS_OVERRIDE", ""),
PrintFailedTestsOnly: printFailedOnly,
TestDirectory: getEnv("TEST_DIRECTORY", "tests"),
}, nil
}
// ApplyConfig applies config
func ApplyConfig(config *Config) error {
if len(config.DNSOverride) > 0 {
if len(config.Host) < 1 {
return fmt.Errorf("TEST_HOST is required to use DNS override")
}
return AppendHostsFile(fmt.Sprintf("%s %s", config.DNSOverride, config.Host))
}
return nil
}
// Read environment variable with default values
func getEnv(key string, defaultValue string) string {
val := os.Getenv(key)
if len(val) == 0 {
return defaultValue
}
return val
}