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service.go
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service.go
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package servicetest
import (
"encoding/json"
"fmt"
"net/http"
"path"
"path/filepath"
"sort"
"strings"
client "github.com/influxdata/kapacitor/client/v1"
"github.com/influxdata/kapacitor/services/httpd"
"github.com/pkg/errors"
)
const (
testPath = "/service-tests"
testPathAnchored = "/service-tests/"
basePath = httpd.BasePath + testPathAnchored
)
var serviceTestsLink = client.Link{Relation: client.Self, Href: path.Join(httpd.BasePath, testPath)}
type Tester interface {
// TestOptions returns an object that is in turn passed to Test.
// User specified data will be JSON encode/decoded to/from the object.
TestOptions() interface{}
// Test a service with the provided options.
Test(options interface{}) error
}
type Service struct {
testers map[string]Tester
routes []httpd.Route
HTTPDService interface {
AddRoutes([]httpd.Route) error
DelRoutes([]httpd.Route)
}
}
func NewService(c Config) *Service {
return &Service{
testers: make(map[string]Tester),
}
}
func (s *Service) Open() error {
// Define API routes
s.routes = []httpd.Route{
{
Method: "GET",
Pattern: testPath,
HandlerFunc: s.handleListTests,
},
{
Method: "GET",
Pattern: testPathAnchored,
HandlerFunc: s.handleTestOptions,
},
{
Method: "POST",
Pattern: testPathAnchored,
HandlerFunc: s.handleTest,
},
}
err := s.HTTPDService.AddRoutes(s.routes)
return errors.Wrap(err, "failed to add API routes")
}
func (s *Service) Close() error {
s.HTTPDService.DelRoutes(s.routes)
return nil
}
func (s *Service) AddTester(name string, t Tester) error {
if _, ok := s.testers[name]; ok {
return fmt.Errorf("tester with name %q already exists", name)
}
s.testers[name] = t
return nil
}
func (s *Service) nameFromPath(p string) string {
return strings.TrimRight(strings.TrimPrefix(p, basePath), "/")
}
func (s *Service) serviceTestLink(service string) client.Link {
return client.Link{Relation: client.Self, Href: path.Join(basePath, service)}
}
type ServiceTests struct {
Link client.Link `json:"link"`
Services ServiceTestList `json:"services"`
}
type ServiceTestList []ServiceTest
func (l ServiceTestList) Len() int { return len(l) }
func (l ServiceTestList) Less(i, j int) bool { return l[i].Name < l[j].Name }
func (l ServiceTestList) Swap(i, j int) { l[i], l[j] = l[j], l[i] }
type ServiceTest struct {
Link client.Link `json:"link"`
Name string `json:"name"`
Options ServiceTestOptions `json:"options"`
}
type ServiceTestOptions interface{}
type ServiceTestResult struct {
Success bool `json:"success"`
Message string `json:"message"`
}
func (s *Service) handleListTests(w http.ResponseWriter, r *http.Request) {
tests := ServiceTests{
Link: serviceTestsLink,
}
pattern := r.URL.Query().Get("pattern")
if pattern == "" {
pattern = "*"
}
for name, test := range s.testers {
if ok, err := filepath.Match(pattern, name); err != nil {
httpd.HttpError(w, fmt.Sprintf("bad pattern: %v", err), true, http.StatusBadRequest)
return
} else if ok {
options := test.TestOptions()
tests.Services = append(tests.Services, ServiceTest{
Link: s.serviceTestLink(name),
Name: name,
Options: options,
})
}
}
sort.Sort(tests.Services)
w.WriteHeader(http.StatusOK)
json.NewEncoder(w).Encode(tests)
}
func (s *Service) handleTestOptions(w http.ResponseWriter, r *http.Request) {
name := s.nameFromPath(r.URL.Path)
if name == "" {
httpd.HttpError(w, "must provide service name", true, http.StatusBadRequest)
return
}
test, ok := s.testers[name]
if !ok {
httpd.HttpError(w, fmt.Sprintf("service %q not found", name), true, http.StatusNotFound)
return
}
options := test.TestOptions()
serviceTest := ServiceTest{
Link: s.serviceTestLink(name),
Name: name,
Options: options,
}
w.WriteHeader(http.StatusOK)
json.NewEncoder(w).Encode(serviceTest)
}
func (s *Service) handleTest(w http.ResponseWriter, r *http.Request) {
name := s.nameFromPath(r.URL.Path)
if name == "" {
httpd.HttpError(w, "must provide service name", true, http.StatusBadRequest)
return
}
test, ok := s.testers[name]
if !ok {
httpd.HttpError(w, fmt.Sprintf("service %q not found", name), true, http.StatusNotFound)
return
}
options := test.TestOptions()
if options != nil {
if err := json.NewDecoder(r.Body).Decode(options); err != nil {
httpd.HttpError(w, fmt.Sprint("failed to decode JSON body:", err), true, http.StatusBadRequest)
return
}
}
result := ServiceTestResult{}
err := test.Test(options)
if err != nil {
result.Message = err.Error()
} else {
result.Success = true
}
w.WriteHeader(http.StatusOK)
json.NewEncoder(w).Encode(result)
}