Init registry

.github/workflows/push-check.yml

@@ -34,6 +34,11 @@ jobs:
           go install mvdan.cc/[email protected]
           test -z "$(gofumpt -l -extra .)" 
 
+      - name: Prepare Consul
+        run: |
+          make prepare
+          sleep 5
+
       - name: Unit Test
         run: go test -v -race -covermode=atomic -coverprofile=coverage.out ./...
 

Makefile

@@ -0,0 +1,3 @@
+prepare:
+	docker pull consul:latest
+	docker run -d --name=dev-consul -e CONSUL_BIND_INTERFACE=eth0 -p 8500:8500 consul:latest

OWNERS

@@ -1,3 +1,4 @@
 approvers:
 - YangruiEmma
-- hanson
+- Hanson
+- baiyutang

README.md

@@ -1 +1,94 @@
-# registry-consul
+# registry-consul (This is a community driven project)
+
+## Docs
+
+### Server
+
+#### Basic Usage
+```
+import (
+    ...
+    "github.com/cloudwego/kitex/pkg/rpcinfo"
+    "github.com/cloudwego/kitex/server"
+    consul "github.com/kitex-contrib/registry-consul"
+    consulapi "github.com/hashicorp/consul/api"
+)
+
+func main() {
+
+    r, err := consul.NewConsulRegister("127.0.0.1:8500")
+    if err != nil {
+        log.Fatal(err)
+    }
+
+    server := hello.NewServer(new(HelloImpl), server.WithRegistry(r), server.WithServerBasicInfo(&rpcinfo.EndpointBasicInfo{
+        ServiceName: "greet.server",
+    }))
+    err = server.Run()
+    if err != nil {
+        log.Fatal(err)
+    }
+}
+```
+
+#### Customize Service Check
+
+registry has a default config for service check like
+
+```
+check.Timeout = "5s"
+check.Interval = "5s"
+check.DeregisterCriticalServiceAfter = "1m"
+```
+
+you can also use `WithCheck` to modify your config
+
+```
+import (
+	...
+	consul "github.com/kitex-contrib/registry-consul"
+	consulapi "github.com/hashicorp/consul/api"
+)
+func main() {
+    ...
+	r, err := consul.NewConsulRegister("127.0.0.1:8500", consul.WithCheck(&consulapi.AgentServiceCheck{
+            Interval:                       "7s",
+            Timeout:                        "5s",
+            DeregisterCriticalServiceAfter: "1m",
+	}))
+}
+```
+
+### Client
+
+```
+import (
+    ...
+    "github.com/cloudwego/kitex/client"
+    consul "github.com/kitex-contrib/registry-consul"
+    ...
+)
+
+func main() {
+    ...
+    r, err := consul.NewConsulResolver("127.0.0.1:8500")
+    if err != nil {
+        log.Fatal(err)
+    }
+    client, err := echo.NewClient("greet.server", client.WithResolver(r))
+    if err != nil {
+        log.Fatal(err)
+    }
+    ...
+}
+```
+
+## Example
+
+See Server and Client in example.
+
+## Compatibility
+
+Compatible with consul.
+
+maintained by: [Hanson](https://github.com/hanson)

consul_registry.go

@@ -0,0 +1,135 @@
+// Copyright 2021 CloudWeGo Authors.
+//
+// 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 consul
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/cloudwego/kitex/pkg/registry"
+	"github.com/hashicorp/consul/api"
+)
+
+type consulRegistry struct {
+	consulClient *api.Client
+	opts         options
+}
+
+var _ registry.Registry = (*consulRegistry)(nil)
+
+type options struct {
+	check *api.AgentServiceCheck
+}
+
+// Option is consul option.
+type Option func(o *options)
+
+// WithCheck is consul registry option to set AgentServiceCheck.
+func WithCheck(check *api.AgentServiceCheck) Option {
+	return func(o *options) { o.check = check }
+}
+
+// NewConsulRegister create a new registry using consul.
+func NewConsulRegister(address string, opts ...Option) (registry.Registry, error) {
+	config := api.DefaultConfig()
+	config.Address = address
+	client, err := api.NewClient(config)
+	if err != nil {
+		return nil, err
+	}
+
+	op := options{
+		check: defaultCheck(),
+	}
+
+	for _, option := range opts {
+		option(&op)
+	}
+
+	return &consulRegistry{consulClient: client, opts: op}, nil
+}
+
+// NewConsulRegisterWithConfig create a new registry using consul, with a custom config.
+func NewConsulRegisterWithConfig(config *api.Config) (*consulRegistry, error) {
+	client, err := api.NewClient(config)
+	if err != nil {
+		return nil, err
+	}
+
+	return &consulRegistry{consulClient: client}, nil
+}
+
+// Register register a service to consul.
+func (c *consulRegistry) Register(info *registry.Info) error {
+	if err := validateRegistryInfo(info); err != nil {
+		return err
+	}
+
+	host, port, err := parseAddr(info.Addr)
+	if err != nil {
+		return err
+	}
+	svcID, err := getServiceId(info)
+	if err != nil {
+		return err
+	}
+	svcInfo := &api.AgentServiceRegistration{
+		ID:      svcID,
+		Address: host,
+		Port:    port,
+		Name:    info.ServiceName,
+		Meta:    info.Tags,
+		Weights: &api.AgentWeights{
+			Passing: info.Weight,
+			Warning: info.Weight,
+		},
+		Check: c.opts.check,
+	}
+
+	if c.opts.check != nil {
+		c.opts.check.TCP = fmt.Sprintf("%s:%d", host, port)
+		svcInfo.Check = c.opts.check
+	}
+
+	return c.consulClient.Agent().ServiceRegister(svcInfo)
+}
+
+// Deregister deregister a service from consul.
+func (c *consulRegistry) Deregister(info *registry.Info) error {
+	svcID, err := getServiceId(info)
+	if err != nil {
+		return err
+	}
+	return c.consulClient.Agent().ServiceDeregister(svcID)
+}
+
+func validateRegistryInfo(info *registry.Info) error {
+	if info.ServiceName == "" {
+		return errors.New("missing service name in consul register")
+	}
+	if info.Addr == nil {
+		return errors.New("missing addr in consul register")
+	}
+	return nil
+}
+
+func defaultCheck() *api.AgentServiceCheck {
+	check := new(api.AgentServiceCheck)
+	check.Timeout = "5s"
+	check.Interval = "5s"
+	check.DeregisterCriticalServiceAfter = "1m"
+
+	return check
+}

consul_resolver.go

@@ -0,0 +1,94 @@
+// Copyright 2021 CloudWeGo Authors.
+//
+// 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 consul
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log"
+
+	"github.com/cloudwego/kitex/pkg/discovery"
+	"github.com/cloudwego/kitex/pkg/rpcinfo"
+	"github.com/hashicorp/consul/api"
+)
+
+const (
+	defaultNetwork = "tcp"
+)
+
+type consulResolver struct {
+	consulClient *api.Client
+}
+
+var _ discovery.Resolver = (*consulResolver)(nil)
+
+// NewConsulResolver create a service resolver using consul.
+func NewConsulResolver(address string) (discovery.Resolver, error) {
+	config := api.DefaultConfig()
+	config.Address = address
+	client, err := api.NewClient(config)
+	if err != nil {
+		return nil, err
+	}
+
+	return &consulResolver{consulClient: client}, nil
+}
+
+// Target return a description for the given target that is suitable for being a key for cache.
+func (c *consulResolver) Target(_ context.Context, target rpcinfo.EndpointInfo) (description string) {
+	return target.ServiceName()
+}
+
+// Resolve a service info by desc.
+func (c *consulResolver) Resolve(_ context.Context, desc string) (discovery.Result, error) {
+	var eps []discovery.Instance
+	agentServiceList, _, err := c.consulClient.Health().Service(desc, "", true, nil)
+	if err != nil {
+		log.Printf("err:%v", err)
+		return discovery.Result{}, err
+	}
+	if len(agentServiceList) == 0 {
+		return discovery.Result{}, errors.New("no service found")
+	}
+	for _, i := range agentServiceList {
+		svc := i.Service
+		if svc == nil || svc.Address == "" {
+			continue
+		}
+		eps = append(eps, discovery.NewInstance(
+			defaultNetwork,
+			fmt.Sprint(svc.Address, ":", svc.Port),
+			svc.Weights.Passing,
+			svc.Meta,
+		))
+	}
+
+	return discovery.Result{
+		Cacheable: true,
+		CacheKey:  desc,
+		Instances: eps,
+	}, nil
+}
+
+// Diff computes the difference between two results.
+func (c *consulResolver) Diff(cacheKey string, prev, next discovery.Result) (discovery.Change, bool) {
+	return discovery.DefaultDiff(cacheKey, prev, next)
+}
+
+// Name return the name of this resolver.
+func (c *consulResolver) Name() string {
+	return "consul"
+}