Add serverless provider (#1374)

Add support to create serverless projects and test packages using
elastic-package with a new provider (--provider serverless).
Currently, supported serverless projects in elastic-package are
observability and security. For testing packages in serverless, geoIP
fields in documents are skipped when comparing with the expected
documents, since it could not be set a specific GeoIP database to make
the tests stable.

internal/kibana/client.go

@@ -52,11 +52,11 @@ func NewClient(opts ...ClientOption) (*Client, error) {
 	// Allow to initialize version from tests.
 	var zeroVersion VersionInfo
 	if c.semver == nil || c.versionInfo == zeroVersion {
-		v, err := c.requestVersion()
+		v, err := c.requestStatus()
 		if err != nil {
 			return nil, fmt.Errorf("failed to get Kibana version: %w", err)
 		}
-		c.versionInfo = v
+		c.versionInfo = v.Version
 
 		c.semver, err = semver.NewVersion(c.versionInfo.Number)
 		if err != nil {

internal/kibana/fleet.go

@@ -0,0 +1,45 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License;
+// you may not use this file except in compliance with the Elastic License.
+
+package kibana
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+)
+
+// DefaultFleetServerURL returns the default Fleet server configured in Kibana
+func (c *Client) DefaultFleetServerURL() (string, error) {
+	path := fmt.Sprintf("%s/fleet_server_hosts", FleetAPI)
+
+	statusCode, respBody, err := c.get(path)
+	if err != nil {
+		return "", fmt.Errorf("could not reach fleet server hosts endpoint: %w", err)
+	}
+
+	if statusCode != http.StatusOK {
+		return "", fmt.Errorf("could not get status data; API status code = %d; response body = %s", statusCode, respBody)
+	}
+
+	var hosts struct {
+		Items []struct {
+			IsDefault bool     `json:"is_default"`
+			HostURLs  []string `json:"host_urls"`
+		} `json:"items"`
+	}
+	err = json.Unmarshal(respBody, &hosts)
+	if err != nil {
+		return "", fmt.Errorf("failed to decode response: %w", err)
+	}
+
+	for _, server := range hosts.Items {
+		if server.IsDefault && len(server.HostURLs) > 0 {
+			return server.HostURLs[0], nil
+		}
+	}
+
+	return "", errors.New("could not find the fleet server URL for this project")
+}

internal/kibana/status.go

@@ -30,29 +30,46 @@ func (v VersionInfo) IsSnapshot() bool {
 
 type statusType struct {
 	Version VersionInfo `json:"version"`
+	Status  struct {
+		Overall struct {
+			Level string `json:"level"`
+		} `json:"overall"`
+	} `json:"status"`
 }
 
 // Version method returns the version of Kibana (Elastic stack)
 func (c *Client) Version() (VersionInfo, error) {
 	return c.versionInfo, nil
 }
 
-func (c *Client) requestVersion() (VersionInfo, error) {
-	var version VersionInfo
+func (c *Client) requestStatus() (statusType, error) {
+	var status statusType
 	statusCode, respBody, err := c.get(StatusAPI)
 	if err != nil {
-		return version, fmt.Errorf("could not reach status endpoint: %w", err)
+		return status, fmt.Errorf("could not reach status endpoint: %w", err)
 	}
 
 	if statusCode != http.StatusOK {
-		return version, fmt.Errorf("could not get status data; API status code = %d; response body = %s", statusCode, respBody)
+		return status, fmt.Errorf("could not get status data; API status code = %d; response body = %s", statusCode, respBody)
 	}
 
-	var status statusType
 	err = json.Unmarshal(respBody, &status)
 	if err != nil {
-		return version, fmt.Errorf("unmarshalling response failed (body: \n%s): %w", respBody, err)
+		return status, fmt.Errorf("unmarshalling response failed (body: \n%s): %w", respBody, err)
+	}
+
+	return status, nil
+}
+
+// CheckHealth checks the Kibana health
+func (c *Client) CheckHealth() error {
+	status, err := c.requestStatus()
+	if err != nil {
+		return fmt.Errorf("could not reach status endpoint: %w", err)
 	}
 
-	return status.Version, nil
+	if status.Status.Overall.Level != "available" {
+		return fmt.Errorf("kibana in unhealthy state: %s", status.Status.Overall.Level)
+	}
+	return nil
 }

internal/profile/_static/config.yml.example

@@ -1,2 +1,12 @@
 # Directory containing GeoIP databases for stacks managed by elastic-agent.
 # stack.geoip_dir: "/path/to/geoip_dir/"
+## Elastic Cloud
+# Host URL
+# stack.elastic_cloud.host: https://cloud.elastic.co
+
+## Serverless stack provider
+# Project type
+# stack.serverless.type: observability
+# Region where the Serverless project is going to be created
+# stack.serverless.region: aws-us-east-1
+