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fly.go
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fly.go
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package fly
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"os/exec"
"runtime"
"strings"
"time"
"github.com/EngineerBetter/concourse-up/config"
"github.com/EngineerBetter/concourse-up/util"
)
// DarwinBinaryURL is a compile-time variable set with -ldflags
var DarwinBinaryURL = "COMPILE_TIME_VARIABLE_fly_darwin_binary_url"
// LinuxBinaryURL is a compile-time variable set with -ldflags
var LinuxBinaryURL = "COMPILE_TIME_VARIABLE_fly_linux_binary_url"
// WindowsBinaryURL is a compile-time variable set with -ldflags
var WindowsBinaryURL = "COMPILE_TIME_VARIABLE_fly_windows_binary_url"
// IClient represents an interface for a client
type IClient interface {
CanConnect() (bool, error)
SetDefaultPipeline(deployArgs *config.DeployArgs, config *config.Config, allowFlyVersionDiscrepancy bool) error
Cleanup() error
}
// Client represents a low-level wrapper for fly
type Client struct {
tempDir *util.TempDir
creds Credentials
stdout io.Writer
stderr io.Writer
}
// Credentials represents credentials needed to connect to concourse
type Credentials struct {
Target string
API string
Username string
Password string
CACert string
}
// New returns a new fly client
func New(creds Credentials, stdout, stderr io.Writer) (IClient, error) {
tempDir, err := util.NewTempDir()
if err != nil {
return nil, err
}
fileHandler, err := os.Create(tempDir.Path("fly"))
if err != nil {
return nil, err
}
defer fileHandler.Close()
url, err := getFlyURL()
if err != nil {
return nil, err
}
resp, err := http.Get(url)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if _, err := io.Copy(fileHandler, resp.Body); err != nil {
return nil, err
}
if err := fileHandler.Sync(); err != nil {
return nil, err
}
if err := os.Chmod(fileHandler.Name(), 0700); err != nil {
return nil, err
}
return &Client{
tempDir,
creds,
stdout,
stderr,
}, nil
}
// CanConnect returns true if it can connect to the concourse
func (client *Client) CanConnect() (bool, error) {
cmd := exec.Command(
client.tempDir.Path("fly"),
"--target",
client.creds.Target,
"login",
"--insecure",
"--concourse-url",
client.creds.API,
"--username",
client.creds.Username,
"--password",
client.creds.Password,
)
stderr := bytes.NewBuffer(nil)
cmd.Stdout = client.stdout
cmd.Stderr = stderr
runErr := cmd.Run()
if runErr == nil {
return true, nil
}
stderrBytes, err := ioutil.ReadAll(stderr)
if err != nil {
return false, err
}
if strings.Contains(string(stderrBytes), "could not reach the Concourse server") {
return false, nil
}
// if there is a legitimate error, copy it to stderr for debugging
if _, err := client.stderr.Write(stderrBytes); err != nil {
return false, err
}
return false, runErr
}
// SetDefaultPipeline sets the default pipeline against a given concourse
func (client *Client) SetDefaultPipeline(deployArgs *config.DeployArgs, config *config.Config, allowFlyVersionDiscrepancy bool) error {
if err := client.login(); err != nil {
return err
}
if allowFlyVersionDiscrepancy {
if err := client.sync(); err != nil {
return err
}
}
pipelinePath := client.tempDir.Path("default-pipeline.yml")
pipelineName := "concourse-up-self-update"
if err := client.writePipelineConfig(pipelinePath, deployArgs, config); err != nil {
return err
}
if err := client.run("set-pipeline", "--pipeline", pipelineName, "--config", pipelinePath, "--non-interactive"); err != nil {
return err
}
if err := os.Remove(pipelinePath); err != nil {
return err
}
return nil
}
func (client *Client) writePipelineConfig(pipelinePath string, deployArgs *config.DeployArgs, config *config.Config) error {
fileHandler, err := os.Create(pipelinePath)
if err != nil {
return err
}
defer fileHandler.Close()
params, err := client.buildDefaultPipelineParams(deployArgs, config)
if err != nil {
return err
}
pipelineConfig, err := util.RenderTemplate(defaultPipelineTemplate, params)
if err != nil {
return err
}
if _, err := fileHandler.Write(pipelineConfig); err != nil {
return err
}
if err := fileHandler.Sync(); err != nil {
return err
}
return nil
}
// Cleanup removes tempfiles
func (client *Client) Cleanup() error {
return client.tempDir.Cleanup()
}
func (client *Client) login() error {
attempts := 50
secondsBetweenAttempts := 4
if _, err := client.stdout.Write([]byte("Waiting for Concourse ATC to start... \n")); err != nil {
return err
}
for i := 0; i < attempts; i++ {
canConnect, err := client.CanConnect()
if err != nil {
return err
}
if canConnect {
return nil
}
time.Sleep(time.Second * time.Duration(secondsBetweenAttempts))
}
return fmt.Errorf("failed to log in to %s after %d seconds", client.creds.API, attempts*secondsBetweenAttempts)
}
func (client *Client) sync() error {
return client.run("sync")
}
func (client *Client) run(args ...string) error {
args = append([]string{"--target", client.creds.Target}, args...)
cmd := exec.Command(client.tempDir.Path("fly"), args...)
cmd.Stdout = client.stdout
cmd.Stderr = client.stderr
return cmd.Run()
}
func getFlyURL() (string, error) {
os := runtime.GOOS
if os == "darwin" {
return DarwinBinaryURL, nil
} else if os == "linux" {
return LinuxBinaryURL, nil
} else if os == "windows" {
return WindowsBinaryURL, nil
}
return "", fmt.Errorf("unknown os: `%s`", os)
}
func (client *Client) buildDefaultPipelineParams(deployArgs *config.DeployArgs, config *config.Config) (*defaultPipelineParams, error) {
awsAccessKeyID := os.Getenv("AWS_ACCESS_KEY_ID")
if awsAccessKeyID == "" {
return nil, errors.New("env var AWS_ACCESS_KEY_ID not found")
}
awsSecretAccessKey := os.Getenv("AWS_SECRET_ACCESS_KEY")
if awsSecretAccessKey == "" {
return nil, errors.New("env var AWS_SECRET_ACCESS_KEY not found")
}
return &defaultPipelineParams{
FlagAWSRegion: deployArgs.AWSRegion,
FlagDomain: deployArgs.Domain,
FlagTLSCert: deployArgs.TLSCert,
FlagTLSKey: deployArgs.TLSKey,
FlagWorkers: deployArgs.WorkerCount,
FlagWorkerSize: deployArgs.WorkerSize,
Deployment: strings.TrimPrefix(config.Deployment, "concourse-up-"),
AWSAccessKeyID: awsAccessKeyID,
AWSSecretAccessKey: awsSecretAccessKey,
}, nil
}
type defaultPipelineParams struct {
FlagAWSRegion string
FlagDomain string
FlagTLSCert string
FlagTLSKey string
FlagWorkers int
FlagWorkerSize string
Deployment string
AWSAccessKeyID string
AWSSecretAccessKey string
AWSDefaultRegion string
}
// Indent is a helper function to indent the field a given number of spaces
func (params defaultPipelineParams) Indent(countStr, field string) string {
return util.Indent(countStr, field)
}
const defaultPipelineTemplate = `
---
resources:
- name: concourse-up-release
type: github-release
source:
user: engineerbetter
repository: concourse-up
pre_release: true
jobs:
- name: self-update
serial: true
plan:
- get: concourse-up-release
trigger: true
- task: update
params:
AWS_REGION: "<% .FlagAWSRegion %>"
DOMAIN: "<% .FlagDomain %>"
TLS_CERT: |-
<% .Indent "8" .FlagTLSCert %>
TLS_KEY: |-
<% .Indent "8" .FlagTLSKey %>
WORKERS: "<% .FlagWorkers %>"
WORKER_SIZE: "<% .FlagWorkerSize %>"
DEPLOYMENT: "<% .Deployment %>"
AWS_ACCESS_KEY_ID: "<% .AWSAccessKeyID %>"
AWS_SECRET_ACCESS_KEY: "<% .AWSSecretAccessKey %>"
SELF_UPDATE: true
config:
platform: linux
image_resource:
type: docker-image
source:
repository: engineerbetter/cup-image
inputs:
- name: concourse-up-release
run:
path: bash
args:
- -c
- |
set -eux
cd concourse-up-release
chmod +x concourse-up-linux-amd64
./concourse-up-linux-amd64 deploy $DEPLOYMENT
`