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github.go
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github.go
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package provider
import (
"context"
"encoding/json"
"fmt"
"net/http"
"time"
)
// GithubProvider is a provider for getting releases from Github.
type GithubProvider struct {
Host string
Port uint
Ssl bool
ProjectPath string
Timeout time.Duration
}
// GithubRelease is a representation - in JSON form - of what Github
// returns when the target service is called.
type GithubRelease struct {
Name string `json:"tag_name"`
Body string `json:"body"`
PublishedAt time.Time `json:"published_at"`
Assets []struct {
Name string `json:"name"`
URL string `json:"browser_download_url"`
} `json:"assets"`
}
func (provider GithubProvider) FetchLastRelease(client HTTPClientPlugin) (*Release, error) {
initGithubProvider(&provider)
err := validateGithubProvider(provider)
if err != nil {
return nil, err
}
releases, err := fetchGithubReleases(provider, client)
if err != nil {
return nil, err
}
var lastRelease *Release
for _, release := range releases {
if lastRelease == nil {
lastRelease = release
} else if lastRelease.CompareTo(release) == -1 {
lastRelease = release
}
}
return lastRelease, nil
}
func (GithubProvider) CacheRelease(r Release) error {
return serializeRelease(&r)
}
func (GithubProvider) RestoreCacheRelease() (*Release, error) {
return deserializeRelease()
}
func (r1 *GithubRelease) CompareTo(r2 *GithubRelease) int {
return compareVersions(r1.Name, r2.Name)
}
func fetchGithubReleases(p GithubProvider, client HTTPClientPlugin) ([]*Release, error) {
srvURL := buildGithubServiceURL(p)
ctx, cancel := context.WithTimeout(context.Background(), p.Timeout)
defer cancel()
req, _ := http.NewRequestWithContext(ctx, http.MethodGet, srvURL, nil)
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("github integration error: %d", resp.StatusCode)
}
var releases []*GithubRelease
err = json.NewDecoder(resp.Body).Decode(&releases)
return convertGithubReleases(releases), err
}
func buildGithubServiceURL(p GithubProvider) string {
protocol := "http"
if p.Ssl {
protocol += "s"
}
baseURL := fmt.Sprintf("%s://%s:%d/repos", protocol, p.Host, p.Port)
return fmt.Sprintf("%s/%s/releases", baseURL, p.ProjectPath)
}
func convertGithubReleases(in []*GithubRelease) []*Release {
size := len(in)
rels := make([]*Release, size)
for i, r := range in {
rels[i] = convertGithubToBase(r)
}
return rels
}
func convertGithubToBase(r *GithubRelease) *Release {
t := Release{
Name: r.Name,
Description: r.Body,
ReleasedAt: r.PublishedAt,
}
size := len(r.Assets)
t.Assets = make([]struct {
Name string `json:"name"`
URL string `json:"url"`
}, size)
for i, link := range r.Assets {
t.Assets[i] = struct {
Name string `json:"name"`
URL string `json:"url"`
}{Name: link.Name, URL: link.URL}
}
return &t
}
func validateGithubProvider(p GithubProvider) error {
switch {
case p.Host == "":
return fmt.Errorf("host is required")
case p.Port <= 0:
return fmt.Errorf("port must be > 0")
case p.ProjectPath == "":
return fmt.Errorf("project path is required")
default:
return nil
}
}
func initGithubProvider(p *GithubProvider) {
const httpPort = 80
const httpsPort = 443
const timeout = time.Second * 30
if p.Port == 0 {
if p.Ssl {
p.Port = httpsPort
} else {
p.Port = httpPort
}
} else {
p.Ssl = p.Port == httpsPort
}
if p.Timeout == 0 {
p.Timeout = timeout
}
}