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package gitlabsourceconfig
import (
"bytes"
"io/ioutil"
"os"
"time"
log "github.com/sirupsen/logrus"
"gopkg.in/yaml.v2"
)
// GitlabSourceDomains holds the domains to be used with the gitlab source
type GitlabSourceDomains struct {
Enabled []string
Broken string
Rollout GitlabSourceRollout
}
// GitlabSourceRollout holds the rollout strategy and percentage
type GitlabSourceRollout struct {
Stickiness string
Percentage int
}
// GitlabSourceConfig holds the configuration for the gitlab source
type GitlabSourceConfig struct {
Domains GitlabSourceDomains
}
// UpdateFromYaml updates the config
// We use new variable here (instead of using `config` directly)
// because if `content` is empty `yaml.Unmarshal` does not update
// the fields already set.
func (config *GitlabSourceConfig) UpdateFromYaml(content []byte) error {
updated := GitlabSourceConfig{}
err := yaml.Unmarshal(content, &updated)
if err != nil {
return err
}
*config = updated
log.WithFields(log.Fields{
"Enabled domains": config.Domains.Enabled,
"Broken domain": config.Domains.Broken,
"Rollout %": config.Domains.Rollout.Percentage,
"Rollout stickiness": config.Domains.Rollout.Stickiness,
}).Info("gitlab source config updated")
return nil
}
// WatchForGitlabSourceConfigChange polls the filesystem and updates test domains if needed.
func WatchForGitlabSourceConfigChange(config *GitlabSourceConfig, interval time.Duration) {
var lastContent []byte
gitlabSourceConfigFile := os.Getenv("GITLAB_SOURCE_CONFIG_FILE")
if gitlabSourceConfigFile == "" {
gitlabSourceConfigFile = ".gitlab-source-config.yml"
}
for {
content, err := readConfig(gitlabSourceConfigFile)
if err != nil {
log.WithError(err).Warn("Failed to read gitlab source config file")
time.Sleep(interval)
continue
}
if !bytes.Equal(lastContent, content) {
lastContent = content
err = config.UpdateFromYaml(content)
if err != nil {
log.WithError(err).Warn("Failed to update gitlab source config")
}
}
time.Sleep(interval)
}
}
func readConfig(configfile string) ([]byte, error) {
content, err := ioutil.ReadFile(configfile)
if err != nil && !os.IsNotExist(err) {
return nil, err
}
return content, nil
}
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