/
client.go
132 lines (122 loc) · 3.43 KB
/
client.go
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package consul
import (
"context"
"fmt"
"net/url"
"strconv"
"strings"
"time"
"github.com/hashicorp/consul/api"
"github.com/go-eagle/eagle/pkg/registry"
)
// Client is consul client config
type Client struct {
client *api.Client
ctx context.Context
cancel context.CancelFunc
}
// NewClient creates consul client
func NewClient(cli *api.Client) *Client {
c := &Client{client: cli}
c.ctx, c.cancel = context.WithCancel(context.Background())
return c
}
// Service get services from consul
func (d *Client) Service(ctx context.Context, service string, index uint64, passingOnly bool) ([]*registry.ServiceInstance, uint64, error) {
opts := &api.QueryOptions{
WaitIndex: index,
WaitTime: time.Second * 55,
}
opts = opts.WithContext(ctx)
entries, meta, err := d.client.Health().Service(service, "", passingOnly, opts)
if err != nil {
return nil, 0, err
}
services := make([]*registry.ServiceInstance, 0)
for _, entry := range entries {
var version string
for _, tag := range entry.Service.Tags {
strs := strings.SplitN(tag, "=", 2)
if len(strs) == 2 && strs[0] == "version" {
version = strs[1]
}
}
var endpoints []string
for scheme, addr := range entry.Service.TaggedAddresses {
if scheme == "lan_ipv4" || scheme == "wan_ipv4" || scheme == "lan_ipv6" || scheme == "wan_ipv6" {
continue
}
endpoints = append(endpoints, addr.Address)
}
services = append(services, ®istry.ServiceInstance{
ID: entry.Service.ID,
Name: entry.Service.Service,
Metadata: entry.Service.Meta,
Version: version,
Endpoints: endpoints,
})
}
return services, meta.LastIndex, nil
}
// Register register service instance to consul
func (d *Client) Register(ctx context.Context, svc *registry.ServiceInstance, enableHealthCheck bool) error {
addresses := make(map[string]api.ServiceAddress)
var addr string
var port uint64
for _, endpoint := range svc.Endpoints {
raw, err := url.Parse(endpoint)
if err != nil {
return err
}
addr = raw.Hostname()
port, _ = strconv.ParseUint(raw.Port(), 10, 16)
addresses[raw.Scheme] = api.ServiceAddress{Address: endpoint, Port: int(port)}
}
asr := &api.AgentServiceRegistration{
ID: svc.ID,
Name: svc.Name,
Meta: svc.Metadata,
Tags: []string{fmt.Sprintf("version=%s", svc.Version)},
TaggedAddresses: addresses,
Address: addr,
Port: int(port),
Checks: []*api.AgentServiceCheck{
{
CheckID: "service:" + svc.ID,
TTL: "30s",
Status: "passing",
DeregisterCriticalServiceAfter: "90s",
},
},
}
if enableHealthCheck {
asr.Checks = append(asr.Checks, &api.AgentServiceCheck{
TCP: fmt.Sprintf("%s:%d", addr, port),
Interval: "20s",
Status: "passing",
DeregisterCriticalServiceAfter: "90s",
})
}
err := d.client.Agent().ServiceRegister(asr)
if err != nil {
return err
}
go func() {
ticker := time.NewTicker(time.Second * 20)
defer ticker.Stop()
for {
select {
case <-ticker.C:
_ = d.client.Agent().UpdateTTL("service:"+svc.ID, "pass", "pass")
case <-d.ctx.Done():
return
}
}
}()
return nil
}
// Deregister deregister service by service ID
func (d *Client) Deregister(ctx context.Context, serviceID string) error {
d.cancel()
return d.client.Agent().ServiceDeregister(serviceID)
}