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Merge pull request #9 from promhippie/health-check
Add simple healthcheck command
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/http" | ||
|
|
||
| "github.com/go-kit/kit/log/level" | ||
| "github.com/promhippie/prometheus-scw-sd/pkg/config" | ||
| "gopkg.in/urfave/cli.v2" | ||
| ) | ||
|
|
||
| // Health provides the sub-command to perform a health check. | ||
| func Health(cfg *config.Config) *cli.Command { | ||
| return &cli.Command{ | ||
| Name: "health", | ||
| Usage: "Perform health checks", | ||
| Flags: []cli.Flag{ | ||
| &cli.StringFlag{ | ||
| Name: "web.address", | ||
| Value: "0.0.0.0:9000", | ||
| Usage: "Address to bind the metrics server", | ||
| EnvVars: []string{"PROMETHEUS_SCW_WEB_ADDRESS"}, | ||
| Destination: &cfg.Server.Addr, | ||
| }, | ||
| &cli.StringFlag{ | ||
| Name: "scw.config", | ||
| Value: "", | ||
| Usage: "Path to Scaleway configuration file", | ||
| EnvVars: []string{"PROMETHEUS_SCW_CONFIG"}, | ||
| }, | ||
| }, | ||
| Action: func(c *cli.Context) error { | ||
| logger := setupLogger(cfg) | ||
|
|
||
| if c.IsSet("scw.config") { | ||
| if err := readConfig(c.String("scw.config"), cfg); err != nil { | ||
| level.Error(logger).Log( | ||
| "msg", "Failed to read config", | ||
| "err", err, | ||
| ) | ||
|
|
||
| return err | ||
| } | ||
| } | ||
|
|
||
| resp, err := http.Get( | ||
| fmt.Sprintf( | ||
| "http://%s/healthz", | ||
| cfg.Server.Addr, | ||
| ), | ||
| ) | ||
|
|
||
| if err != nil { | ||
| level.Error(logger).Log( | ||
| "msg", "Failed to request health check", | ||
| "err", err, | ||
| ) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| defer resp.Body.Close() | ||
|
|
||
| if resp.StatusCode != 200 { | ||
| level.Error(logger).Log( | ||
| "msg", "Health check seems to be in bad state", | ||
| "err", err, | ||
| "code", resp.StatusCode, | ||
| ) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| }, | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "errors" | ||
|
|
||
| "github.com/go-kit/kit/log/level" | ||
| "github.com/promhippie/prometheus-scw-sd/pkg/action" | ||
| "github.com/promhippie/prometheus-scw-sd/pkg/config" | ||
| "gopkg.in/urfave/cli.v2" | ||
| ) | ||
|
|
||
| var ( | ||
| // ErrMissingOutputFile defines the error if output.file is empty. | ||
| ErrMissingOutputFile = errors.New("Missing path for output.file") | ||
|
|
||
| // ErrMissingScwToken defines the error if scw.token is empty. | ||
| ErrMissingScwToken = errors.New("Missing required scw.token") | ||
|
|
||
| // ErrMissingScwOrg defines the error if scw.org is empty. | ||
| ErrMissingScwOrg = errors.New("Missing required scw.org") | ||
|
|
||
| // ErrMissingAnyCredentials defines the error if no credentials are provided. | ||
| ErrMissingAnyCredentials = errors.New("Missing any credentials") | ||
| ) | ||
|
|
||
| // Server provides the sub-command to start the server. | ||
| func Server(cfg *config.Config) *cli.Command { | ||
| return &cli.Command{ | ||
| Name: "server", | ||
| Usage: "Start integrated server", | ||
| Flags: []cli.Flag{ | ||
| &cli.StringFlag{ | ||
| Name: "web.address", | ||
| Value: "0.0.0.0:9000", | ||
| Usage: "Address to bind the metrics server", | ||
| EnvVars: []string{"PROMETHEUS_SCW_WEB_ADDRESS"}, | ||
| Destination: &cfg.Server.Addr, | ||
| }, | ||
| &cli.StringFlag{ | ||
| Name: "web.path", | ||
| Value: "/metrics", | ||
| Usage: "Path to bind the metrics server", | ||
| EnvVars: []string{"PROMETHEUS_SCW_WEB_PATH"}, | ||
| Destination: &cfg.Server.Path, | ||
| }, | ||
| &cli.StringFlag{ | ||
| Name: "output.file", | ||
| Value: "/etc/prometheus/scw.json", | ||
| Usage: "Path to write the file_sd config", | ||
| EnvVars: []string{"PROMETHEUS_SCW_OUTPUT_FILE"}, | ||
| Destination: &cfg.Target.File, | ||
| }, | ||
| &cli.IntFlag{ | ||
| Name: "output.refresh", | ||
| Value: 30, | ||
| Usage: "Discovery refresh interval in seconds", | ||
| EnvVars: []string{"PROMETHEUS_SCW_OUTPUT_REFRESH"}, | ||
| Destination: &cfg.Target.Refresh, | ||
| }, | ||
| &cli.StringFlag{ | ||
| Name: "scw.token", | ||
| Value: "", | ||
| Usage: "Access token for the Scaleway API", | ||
| EnvVars: []string{"PROMETHEUS_SCW_TOKEN"}, | ||
| }, | ||
| &cli.StringFlag{ | ||
| Name: "scw.org", | ||
| Value: "", | ||
| Usage: "Organization for the Scaleway API", | ||
| EnvVars: []string{"PROMETHEUS_SCW_ORG"}, | ||
| }, | ||
| &cli.StringFlag{ | ||
| Name: "scw.region", | ||
| Value: "", | ||
| Usage: "Region for the Scaleway API", | ||
| EnvVars: []string{"PROMETHEUS_SCW_REGION"}, | ||
| }, | ||
| &cli.StringFlag{ | ||
| Name: "scw.config", | ||
| Value: "", | ||
| Usage: "Path to Scaleway configuration file", | ||
| EnvVars: []string{"PROMETHEUS_SCW_CONFIG"}, | ||
| }, | ||
| }, | ||
| Action: func(c *cli.Context) error { | ||
| logger := setupLogger(cfg) | ||
|
|
||
| if c.IsSet("scw.config") { | ||
| if err := readConfig(c.String("scw.config"), cfg); err != nil { | ||
| level.Error(logger).Log( | ||
| "msg", "Failed to read config", | ||
| "err", err, | ||
| ) | ||
|
|
||
| return err | ||
| } | ||
| } | ||
|
|
||
| if cfg.Target.File == "" { | ||
| level.Error(logger).Log( | ||
| "msg", ErrMissingOutputFile, | ||
| ) | ||
|
|
||
| return ErrMissingOutputFile | ||
| } | ||
|
|
||
| if c.IsSet("scw.token") && c.IsSet("scw.org") && c.IsSet("scw.region") { | ||
| credentials := config.Credential{ | ||
| Project: "default", | ||
| Token: c.String("scw.token"), | ||
| Org: c.String("scw.org"), | ||
| Region: c.String("scw.region"), | ||
| } | ||
|
|
||
| cfg.Target.Credentials = append( | ||
| cfg.Target.Credentials, | ||
| credentials, | ||
| ) | ||
|
|
||
| if credentials.Token == "" { | ||
| level.Error(logger).Log( | ||
| "msg", ErrMissingScwToken, | ||
| ) | ||
|
|
||
| return ErrMissingScwToken | ||
| } | ||
|
|
||
| if credentials.Org == "" { | ||
| level.Error(logger).Log( | ||
| "msg", ErrMissingScwOrg, | ||
| ) | ||
|
|
||
| return ErrMissingScwOrg | ||
| } | ||
| } | ||
|
|
||
| if len(cfg.Target.Credentials) == 0 { | ||
| level.Error(logger).Log( | ||
| "msg", ErrMissingAnyCredentials, | ||
| ) | ||
|
|
||
| return ErrMissingAnyCredentials | ||
| } | ||
|
|
||
| return action.Server(cfg, logger) | ||
| }, | ||
| } | ||
| } |