clients.go

package daemon

import (
	"fmt"
	"sync"

	"github.com/mitchellh/mapstructure"
	"github.com/sensu/uchiwa/uchiwa/helpers"
	"github.com/sensu/uchiwa/uchiwa/logger"
	"github.com/sensu/uchiwa/uchiwa/structs"
)

// buildClients constructs clients objects for frontend consumption
func (d *Daemon) buildClients() {
	wg := &sync.WaitGroup{}

	for _, c := range d.Data.Clients {
		wg.Add(1)

		go d.buildClient(c, wg)
	}

	wg.Wait()
}

func (d *Daemon) buildClient(c interface{}, wg *sync.WaitGroup) {
	defer wg.Done()

	client, ok := c.(map[string]interface{})
	if !ok {
		return
	}

	dc, ok := client["dc"].(string)
	if !ok {
		return
	}

	name, ok := client["name"].(string)
	if !ok {
		return
	}

	client["_id"] = fmt.Sprintf("%s/%s", dc, name)
	client = findClientEvents(client, &d.Data.Events)
	client["silenced"] = helpers.IsClientSilenced(name, dc, d.Data.Silenced)
}

// findClientEvents searches for all events related to a particular client
// and set the status and output attributes of this client based on the events found
func findClientEvents(client map[string]interface{}, events *[]interface{}) map[string]interface{} {
	if len(*events) == 0 {
		client["status"] = 0
	} else {
		var criticals, warnings int
		var results []string
		for _, e := range *events {

			eventMap, ok := e.(map[string]interface{})
			if !ok {
				logger.Warningf("Could not convert the event to a map: %+v", eventMap)
				continue
			}

			// skip this event if the check attribute does not exist
			if eventMap["check"] == nil {
				continue
			}

			// skip this event if the datacenter isn't the right one
			if eventMap["dc"] == nil || eventMap["dc"] != client["dc"] {
				continue
			}

			clientMap, ok := eventMap["client"].(map[string]interface{})
			if !ok {
				logger.Warningf("Could not convert the event's client to a map: %+v", eventMap)
				continue
			}

			// skip this event if the client isn't the right one
			if clientMap["name"] == nil || clientMap["name"] != client["name"] {
				continue
			}

			// convert the check to a structure for easier handling
			var check structs.GenericCheck
			err := mapstructure.Decode(eventMap["check"], &check)
			if err != nil {
				logger.Warningf("Could not convert the event's check to a generic check structure: %s", err)
				continue
			}

			if check.Status == 2 {
				criticals++
			} else if check.Status == 1 {
				warnings++
			}

			results = append(results, check.Output)
		}

		if len(results) == 0 {
			client["status"] = 0
		} else if criticals > 0 {
			client["status"] = 2
		} else if warnings > 0 {
			client["status"] = 1
		} else {
			client["status"] = 3
		}

		if len(results) == 1 {
			client["output"] = results[0]
		} else if len(results) > 1 {
			output := fmt.Sprintf("%s and %d more...", results[0], (len(results) - 1))
			client["output"] = output
		}
	}

	return client
}