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infra.go
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infra.go
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// Package infra proxies Terraform commands.
package infra
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/apex/apex/function"
"github.com/apex/log"
)
// TODO(tj): revisit removal of Region when TF supports ~/.aws/config
// Dir in which Terraform configs are stored
const Dir = "infrastructure"
// Proxy is a wrapper around Terraform commands.
type Proxy struct {
Functions []*function.Function
Region string
Environment string
}
// Run terraform command in infrastructure directory.
func (p *Proxy) Run(args ...string) error {
if p.shouldInjectVars(args) {
args = append(args, p.functionVars()...)
}
log.WithFields(log.Fields{
"args": args,
}).Debug("terraform")
cmd := exec.Command("terraform", args...)
cmd.Env = append(os.Environ(), fmt.Sprintf("AWS_REGION=%s", p.Region))
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Dir = filepath.Join(Dir, p.Environment)
return cmd.Run()
}
// functionVars returns the function ARN's as terraform -var arguments.
func (p *Proxy) functionVars() (args []string) {
args = append(args, "-var")
args = append(args, fmt.Sprintf("aws_region=%s", p.Region))
for _, fn := range p.Functions {
config, err := fn.GetConfig()
if err != nil {
log.Debugf("can't fetch function config: %s", err.Error())
continue
}
args = append(args, "-var")
args = append(args, fmt.Sprintf("apex_function_%s=%s", fn.Name, *config.Configuration.FunctionArn))
}
return args
}
// shouldInjectVars checks if the command accepts -var flags.
func (p *Proxy) shouldInjectVars(args []string) bool {
if len(args) == 0 {
return false
}
return args[0] == "plan" || args[0] == "apply" || args[0] == "destroy"
}
// Output fetches output variable `name` from terraform.
func Output(environment, name string) (string, error) {
cmd := exec.Command("sh", "-c", fmt.Sprintf("terraform output %s", name))
cmd.Dir = filepath.Join(Dir, environment)
out, err := cmd.CombinedOutput()
if err != nil {
return "", err
}
return strings.Trim(string(out), "\n"), nil
}