oc-lib/tools/api.go

package tools

import (
	"encoding/json"
	"errors"

	"cloud.o-forge.io/core/oc-lib/dbs/mongo"
)

var UncatchedError = []error{}

type State int

const (
	ALIVE State = iota
	REDUCED_SERVICE
	UNPROCESSABLE_ENTITY
	DB_FALLOUT
	TEAPOT
	DEAD
	WAITING
)

func (s State) EnumIndex() int {
	return int(s)
}

func ToState(str string) State {
	for _, s := range []State{ALIVE, REDUCED_SERVICE, UNPROCESSABLE_ENTITY, DB_FALLOUT, TEAPOT, DEAD, WAITING} {
		if s.String() == str {
			return s
		}
	}
	return DEAD
}

func (s State) String() string {
	return [...]string{"alive", "reduced service", "unprocessable entity", "database fallout",
		"some things boils in here, i'm probably a teapot", "dead", "waiting"}[s]
}

type API struct{}

func (a *API) GetState() (State, int, error) {
	// Check if the database is up
	err := mongo.MONGOService.TestDB(GetConfig())
	if err != nil {
		return DB_FALLOUT, 200, err
	}
	err = mongo.MONGOService.TestCollections(GetConfig(), []string{})
	if err != nil {
		return UNPROCESSABLE_ENTITY, 200, err
	}
	if len(UncatchedError) > 0 {
		errStr := ""
		for _, e := range UncatchedError {
			errStr += e.Error() + "\n"
		}
		return TEAPOT, 200, errors.New(errStr)
	}
	return ALIVE, 200, nil
}

func (a *API) CheckRemotePeer(url string) (State, map[string]int) {
	// Check if the database is up
	caller := NewHTTPCaller(map[string]map[METHOD]string{})
	var resp APIStatusResponse
	b, err := caller.CallPost(url, "/status", []string{})
	if err != nil {
		return DEAD, map[string]int{}
	}
	json.Unmarshal(b, &resp)
	if resp.Data == nil {
		return DEAD, map[string]int{}
	}
	new := map[string]int{}
	for k, v := range resp.Data.Services {
		new[k] = ToState(v).EnumIndex()
	}
	return ToState(resp.Data.State), new
}

func (a *API) CheckRemoteAPIs(urls map[string]string) (State, map[string]string, error) {
	// Check if the database is up
	new := map[string]string{}
	caller := NewHTTPCaller(map[string]map[METHOD]string{})
	code := 0
	u := ""
	e := ""
	for appName, url := range urls {
		var resp APIStatusResponse
		b, err := caller.CallGet(url, "/version/status")
		if err != nil {
			return REDUCED_SERVICE, new, err
		}
		json.Unmarshal(b, &resp)
		if resp.Data == nil {
			return DEAD, new, errors.New(url + " -> is DEAD")
		}
		new[appName] = resp.Data.State
		if resp.Data.Code > code {
			code = resp.Data.Code
			u = url
			e += resp.Error
		}
	}
	if code > 0 {
		return REDUCED_SERVICE, new, errors.New(u + " -> " + e)
	}
	return ALIVE, new, nil
}

type APIStatusResponse struct {
	Data  *APIStatus `json:"data"`
	Error string     `json:"error"`
}

type APIStatus struct {
	Code     int               `json:"code"`
	State    string            `json:"state"`
	Services map[string]string `json:"services"`
}