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registry.go
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registry.go
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/* Copyright 2020 Multi-Tier-Cloud Development Team
*
* 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 registry
// Client-side library for querying the registry-service
import (
"context"
"encoding/json"
"errors"
"github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/pnet"
"github.com/libp2p/go-libp2p-discovery"
"github.com/multiformats/go-multiaddr"
"github.com/Multi-Tier-Cloud/common/p2putil"
"github.com/Multi-Tier-Cloud/service-registry/common"
)
// Microservice info stored by registry-service
// Encoding/decoding of this struct is done client-side
// Registry-service simply stores the string it is given
type ServiceInfo struct {
ContentHash string
DockerHash string
NetworkSoftReq p2putil.PerfInd
NetworkHardReq p2putil.PerfInd
CpuReq int
MemoryReq int
}
// Functions ending in *Service create a temporary p2p node to communicate with registry-service
// Must pass in bootstrap addresses to connect to and optional PSK
// Functions ending in *ServiceWithHostRouting take in an existing p2p node and routing discovery
// to perform the operation without having to create that temporary p2p node
// Add service info {serviceName, info} to registry-service
func AddService(bootstraps []multiaddr.Multiaddr, psk pnet.PSK, serviceName string, info ServiceInfo) (
addResponse string, err error) {
reqBytes, err := marshalAddRequest(serviceName, info)
if err != nil {
return "", err
}
response, err := common.SendRequest(bootstraps, psk, common.AddProtocolID, reqBytes)
if err != nil {
return "", err
}
return string(response), nil
}
func AddServiceWithHostRouting(
ctx context.Context, host host.Host, routingDiscovery *discovery.RoutingDiscovery,
serviceName string, info ServiceInfo) (addResponse string, err error) {
reqBytes, err := marshalAddRequest(serviceName, info)
if err != nil {
return "", err
}
data, err := common.SendRequestWithHostRouting(
ctx, host, routingDiscovery, common.AddProtocolID, reqBytes)
if err != nil {
return "", err
}
return string(data), nil
}
func marshalAddRequest(serviceName string, info ServiceInfo) (addRequest []byte, err error) {
infoBytes, err := json.Marshal(info)
if err != nil {
return nil, err
}
reqInfo := common.AddRequest{Name: serviceName, InfoStr: string(infoBytes)}
return json.Marshal(reqInfo)
}
// Get service info from registry-service by searching for service with a name matching the given query
func GetService(bootstraps []multiaddr.Multiaddr, psk pnet.PSK, query string) (
info ServiceInfo, err error) {
response, err := common.SendRequest(bootstraps, psk, common.GetProtocolID, []byte(query))
if err != nil {
return info, err
}
return unmarshalGetResponse(response)
}
func GetServiceWithHostRouting(
ctx context.Context, host host.Host, routingDiscovery *discovery.RoutingDiscovery, query string) (
info ServiceInfo, err error) {
response, err := common.SendRequestWithHostRouting(
ctx, host, routingDiscovery, common.GetProtocolID, []byte(query))
if err != nil {
return info, err
}
return unmarshalGetResponse(response)
}
func unmarshalGetResponse(getResponse []byte) (info ServiceInfo, err error) {
var respInfo common.GetResponse
err = json.Unmarshal(getResponse, &respInfo)
if err != nil {
return info, err
}
if !respInfo.LookupOk {
return info, errors.New("registry: Error finding service info")
}
err = json.Unmarshal([]byte(respInfo.InfoStr), &info)
if err != nil {
return info, err
}
return info, nil
}
// List all services added to registry-service
// Returns mapping from service name to service info
func ListServices(bootstraps []multiaddr.Multiaddr, psk pnet.PSK) (
nameToInfo map[string]ServiceInfo, err error) {
response, err := common.SendRequest(bootstraps, psk, common.ListProtocolID, []byte{})
if err != nil {
return nil, err
}
return unmarshalListResponse(response)
}
func ListServicesWithHostRouting(
ctx context.Context, host host.Host, routingDiscovery *discovery.RoutingDiscovery) (
nameToInfo map[string]ServiceInfo, err error) {
response, err := common.SendRequestWithHostRouting(
ctx, host, routingDiscovery, common.ListProtocolID, []byte{})
if err != nil {
return nil, err
}
return unmarshalListResponse(response)
}
func unmarshalListResponse(listResponse []byte) (nameToInfo map[string]ServiceInfo, err error) {
var respInfo common.ListResponse
err = json.Unmarshal(listResponse, &respInfo)
if err != nil {
return nil, err
}
if !respInfo.LookupOk {
return nil, errors.New("registry: Error finding service info")
}
nameToInfo = make(map[string]ServiceInfo)
for serviceName, infoStr := range respInfo.NameToInfoStr {
var info ServiceInfo
err = json.Unmarshal([]byte(infoStr), &info)
if err != nil {
return nil, err
}
nameToInfo[serviceName] = info
}
return nameToInfo, nil
}
// Delete service with given serviceName from registry-service
func DeleteService(bootstraps []multiaddr.Multiaddr, psk pnet.PSK, serviceName string) (
deleteResponse string, err error) {
response, err := common.SendRequest(bootstraps, psk, common.DeleteProtocolID, []byte(serviceName))
if err != nil {
return "", err
}
return string(response), nil
}
func DeleteServiceWithHostRouting(
ctx context.Context, host host.Host, routingDiscovery *discovery.RoutingDiscovery, serviceName string) (
deleteResponse string, err error) {
response, err := common.SendRequestWithHostRouting(
ctx, host, routingDiscovery, common.DeleteProtocolID, []byte(serviceName))
if err != nil {
return "", err
}
return string(response), nil
}