/
instance_handler.go
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/
instance_handler.go
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// Copyright 2016 IBM Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package amalgam8
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"strings"
"time"
log "github.com/Sirupsen/logrus"
"github.com/ant0ine/go-json-rest/rest"
"github.com/amalgam8/amalgam8/registry/server/env"
"github.com/amalgam8/amalgam8/registry/server/middleware"
"github.com/amalgam8/amalgam8/registry/store"
"github.com/amalgam8/amalgam8/registry/utils/i18n"
"github.com/amalgam8/amalgam8/registry/utils/reflection"
)
var instanceQueryValuesToFieldNames = make(map[string]string)
func init() {
var si ServiceInstance
instanceQueryValuesToFieldNames = si.GetJSONToFieldsMap()
}
func (routes *Routes) registerInstance(w rest.ResponseWriter, r *rest.Request) {
var err error
var req *InstanceRegistration
req, err = routes.parseInstanceRegistrationRequest(w, r)
if err != nil {
return // error to client already set
}
catalog := routes.catalog(w, r)
if catalog == nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "catalog is nil",
}).Errorf("Failed to register instance %+v", req)
// error response set by routes.catalog()
return
}
si := &store.ServiceInstance{
ServiceName: req.ServiceName,
Endpoint: &store.Endpoint{Type: req.Endpoint.Type, Value: req.Endpoint.Value},
Status: strings.ToUpper(req.Status),
TTL: time.Duration(req.TTL) * time.Second,
Metadata: req.Metadata,
Tags: req.Tags}
var sir *store.ServiceInstance
if sir, err = catalog.Register(si); err != nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": err,
}).Warnf("Failed to register instance %+v", req)
if regerr, ok := err.(*store.Error); ok {
switch regerr.Code {
case store.ErrorNoInstanceServiceName:
i18n.Error(r, w, statusCodeFromError(err), i18n.ErrorNoServiceName)
case store.ErrorInstanceServiceNameTooLong:
i18n.Error(r, w, statusCodeFromError(err), i18n.ErrorServiceNameTooLong, store.ServiceNameMaxLength)
case store.ErrorInstanceEndpointValueTooLong:
i18n.Error(r, w, statusCodeFromError(err), i18n.ErrorEndpointValueTooLong, store.EndpointValueMaxLength)
case store.ErrorInstanceStatusLengthTooLong:
i18n.Error(r, w, statusCodeFromError(err), i18n.ErrorStatusLengthTooLong, store.StatusMaxLength)
case store.ErrorInstanceMetaDataTooLong:
i18n.Error(r, w, statusCodeFromError(err), i18n.ErrorMetaDataTooLong, store.MetadataMaxLength)
default:
i18n.Error(r, w, statusCodeFromError(err), i18n.ErrorInstanceRegistrationFailed)
}
} else {
i18n.Error(r, w, statusCodeFromError(err), i18n.ErrorInstanceRegistrationFailed)
}
return
} else if sir == nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "instance is nil",
}).Warnf("Failed to register instance %+v", req)
i18n.Error(r, w, http.StatusInternalServerError, i18n.ErrorNilObject)
return
} else if sir.ID == "" {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "instance id is empty",
}).Warnf("Failed to register instance %s", sir)
i18n.Error(r, w, http.StatusInternalServerError, i18n.ErrorInstanceIdentifierMissing)
return
}
r.Env[env.ServiceInstance] = sir
routes.sendRegistrationResponse(w, r, sir)
}
func (routes *Routes) sendRegistrationResponse(w rest.ResponseWriter, r *rest.Request, sir *store.ServiceInstance) {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
}).Infof("Instance %s registered", sir)
ttl := uint32(sir.TTL / time.Second)
linksURL := r.BaseUrl()
if middleware.IsUsingSecureConnection(r) { // request came in over a secure connection, continue using it
linksURL.Scheme = "https"
}
links := BuildLinks(linksURL.String(), sir.ID)
instance := &ServiceInstance{
ID: sir.ID,
TTL: ttl,
Links: links,
}
w.Header().Set("Location", links.Self)
w.WriteHeader(http.StatusCreated)
if err := w.WriteJson(instance); err != nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": err,
}).Warnf("Failed to write registration response for instance %s", sir)
i18n.Error(r, w, http.StatusInternalServerError, i18n.ErrorEncoding)
}
}
func (routes *Routes) parseInstanceRegistrationRequest(w rest.ResponseWriter, r *rest.Request) (*InstanceRegistration, error) {
var req InstanceRegistration
var err error
if err = r.DecodeJsonPayload(&req); err != nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": err,
}).Warn("Failed to register instance")
i18n.Error(r, w, http.StatusBadRequest, i18n.ErrorInstanceRegistrationFailed)
return nil, err
}
if req.ServiceName == "" {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "service name is required",
}).Warnf("Failed to register instance %+v", req)
i18n.Error(r, w, http.StatusBadRequest, i18n.ErrorServiceNameMissing)
return nil, errors.New("Service name is required")
}
if req.Endpoint == nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "Endpoint is required",
}).Warnf("Failed to register instance %+v", req)
i18n.Error(r, w, http.StatusBadRequest, i18n.ErrorInstanceEndpointMissing)
return nil, errors.New("Endpoint is required")
}
if req.Endpoint.Type == "" || req.Endpoint.Value == "" {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "Endpoint type or value are missing or mismatched",
}).Warnf("Failed to register instance %+v", req)
i18n.Error(r, w, http.StatusBadRequest, i18n.ErrorInstanceEndpontMalformed)
return nil, errors.New("Endpoint type or value are missing or mismatched")
}
switch req.Endpoint.Type {
case EndpointTypeHTTP:
case EndpointTypeHTTPS:
case EndpointTypeUDP:
case EndpointTypeTCP:
case EndpointTypeUser:
default:
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "Endpoint type is of invalid value",
}).Warnf("Failed to register instance %+v", req)
i18n.Error(r, w, http.StatusBadRequest, i18n.ErrorInstanceEndpointInvalidType)
return nil, errors.New("Endpoint type is of invalid value")
}
metadataValid := true
if req.Metadata != nil {
metadataValid = validateJSON(req.Metadata)
}
if !metadataValid {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "Metadata is invalid",
}).Warnf("Failed to register instance %+v", req)
i18n.Error(r, w, http.StatusBadRequest, i18n.ErrorInstanceMetadataInvalid)
return nil, errors.New("Metadata is invalid")
}
// If the status is not passed in, set it to UP
if req.Status == "" {
req.Status = store.Up
}
// Validate the status value
switch strings.ToUpper(req.Status) {
case store.Up:
case store.Starting:
case store.OutOfService:
default:
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "Status field is not a valid value",
}).Warnf("Failed to register instance %+v", req)
i18n.Error(r, w, http.StatusBadRequest, i18n.ErrorInstanceStatusInvalid,
map[string]interface{}{"Status": fmt.Sprintf("%s, %s, %s", store.Up, store.Starting, store.OutOfService)})
return nil, errors.New("Status field is not a valid value")
}
return &req, nil
}
func validateJSON(jsonString json.RawMessage) bool {
var js interface{}
return json.Unmarshal(jsonString, &js) == nil
}
func (routes *Routes) deregisterInstance(w rest.ResponseWriter, r *rest.Request) {
iid := r.PathParam(RouteParamInstanceID)
if iid == "" {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "instance id is required",
}).Warn("Failed to deregister instance")
i18n.Error(r, w, http.StatusBadRequest, i18n.ErrorInstanceIdentifierMissing)
return
}
catalog := routes.catalog(w, r)
if catalog == nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "catalog is nil",
}).Errorf("Failed to deregister instance %s", iid)
// error response set by routes.catalog()
return
}
si, err := catalog.Deregister(iid)
if err != nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": err,
}).Warnf("Failed to deregister instance %s", iid)
i18n.Error(r, w, statusCodeFromError(err), i18n.ErrorInstanceDeletionFailed)
return
}
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
}).Infof("Instance id %s deregistered", iid)
r.Env[env.ServiceInstance] = si
w.WriteHeader(http.StatusOK)
}
func (routes *Routes) renewInstance(w rest.ResponseWriter, r *rest.Request) {
iid := r.PathParam(RouteParamInstanceID)
if iid == "" {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "instance id is required",
}).Warn("Failed to renew instance")
i18n.Error(r, w, http.StatusBadRequest, i18n.ErrorInstanceIdentifierMissing)
return
}
catalog := routes.catalog(w, r)
if catalog == nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "catalog is nil",
}).Errorf("Failed to renew instance %s", iid)
// error response set by routes.catalog()
return
}
si, err := catalog.Renew(iid)
if err != nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": err,
}).Warnf("Failed to renew instance %s", iid)
i18n.Error(r, w, statusCodeFromError(err), i18n.ErrorInstanceHeartbeatFailed)
return
}
r.Env[env.ServiceInstance] = si
w.WriteHeader(http.StatusOK)
}
func (routes *Routes) listInstances(w rest.ResponseWriter, r *rest.Request) {
var fields []string
fields, err := extractFields(r)
if err != nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": err,
}).Warn("Failed to list instances")
i18n.Error(r, w, http.StatusBadRequest, i18n.ErrorFilterBadFields)
return
}
sc, err := newSelectCriteria(r)
if err != nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": err,
}).Error("Failed to list instances")
i18n.Error(r, w, http.StatusBadRequest, i18n.ErrorFilterSelectionCriteria)
return
}
catalog := routes.catalog(w, r)
if catalog == nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "catalog is nil",
}).Error("Failed to list instances")
// error response set by routes.catalog()
return
}
services := catalog.ListServices(nil)
if services == nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": "services list is nil",
}).Error("Failed to list instances")
i18n.Error(r, w, http.StatusInternalServerError, i18n.ErrorInstanceEnumeration)
return
}
var insts = []*ServiceInstance{}
for _, svc := range services {
instances, err := catalog.List(svc.ServiceName, sc.instanceFilter)
if err != nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": err,
}).Errorf("Failed to list instances for service %s", svc.ServiceName)
i18n.Error(r, w, http.StatusInternalServerError, i18n.ErrorInstanceEnumeration)
return
}
for _, si := range instances {
inst, err := copyInstanceWithFilter(svc.ServiceName, si, fields)
if err != nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": err,
}).Warn("Failed to list instances")
i18n.Error(r, w, http.StatusInternalServerError, i18n.ErrorInstanceEnumeration)
return
}
insts = append(insts, inst)
}
}
if err = w.WriteJson(&InstancesList{Instances: insts}); err != nil {
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
"error": err,
}).Warn("Failed to encode instances list response")
i18n.Error(r, w, http.StatusInternalServerError, i18n.ErrorEncoding)
return
}
routes.logger.WithFields(log.Fields{
"namespace": r.Env[env.Namespace],
}).Infof("Lookup instances (%d)", len(insts))
}
func statusCodeFromError(err error) int {
if regerr, ok := err.(*store.Error); ok {
switch regerr.Code {
case store.ErrorBadRequest:
return http.StatusBadRequest
case store.ErrorNoSuchServiceName:
return http.StatusNotFound
case store.ErrorNoSuchServiceInstance:
return http.StatusGone
case store.ErrorNamespaceQuotaExceeded:
return http.StatusForbidden
case store.ErrorInternalServerError:
return http.StatusInternalServerError
case store.ErrorNoInstanceServiceName:
return http.StatusBadRequest
case store.ErrorInstanceServiceNameTooLong:
return http.StatusBadRequest
case store.ErrorInstanceEndpointValueTooLong:
return http.StatusBadRequest
case store.ErrorInstanceStatusLengthTooLong:
return http.StatusBadRequest
case store.ErrorInstanceMetaDataTooLong:
return http.StatusBadRequest
default:
return http.StatusInternalServerError
}
}
return http.StatusInternalServerError
}
// Extract and validate filtering fields request. Note that an empty-string request is perfectly valid
func extractFields(r *rest.Request) ([]string, error) {
if _, filteringRequested := r.URL.Query()["fields"]; !filteringRequested {
return nil, nil
}
fieldsValue := r.URL.Query().Get("fields")
if fieldsValue == "" {
return []string{}, nil
}
fieldsSplit := strings.Split(fieldsValue, ",")
fields := make([]string, len(fieldsSplit))
for i, fld := range fieldsSplit {
fldName, ok := instanceQueryValuesToFieldNames[fld]
if !ok {
return nil, fmt.Errorf("Field %s is not a valid field", fld)
}
fields[i] = fldName
}
return fields, nil
}
func copyInstanceWithFilter(sname string, si *store.ServiceInstance, fields []string) (*ServiceInstance, error) {
inst := &ServiceInstance{
ID: si.ID,
ServiceName: sname,
Endpoint: &InstanceAddress{
Type: si.Endpoint.Type,
Value: si.Endpoint.Value,
},
Status: si.Status,
Tags: si.Tags,
TTL: uint32(si.TTL / time.Second),
Metadata: si.Metadata,
LastHeartbeat: &si.LastRenewal,
}
if fields != nil {
filteredInstance := &ServiceInstance{}
err := reflection.FilterStructByFields(inst, filteredInstance, fields)
if err != nil {
return nil, err
}
// Add Endpoint because it should always be returned to the user
filteredInstance.Endpoint = &InstanceAddress{Type: inst.Endpoint.Type, Value: inst.Endpoint.Value}
filteredInstance.ID = inst.ID
return filteredInstance, nil
}
return inst, nil
}