/
client.go
249 lines (223 loc) · 7.28 KB
/
client.go
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package consul
import (
"context"
"errors"
"fmt"
"math/rand"
"net"
"net/url"
"strconv"
"strings"
"time"
"github.com/go-kratos/kratos/v2/log"
"github.com/go-kratos/kratos/v2/registry"
"github.com/hashicorp/consul/api"
)
type Datacenter string
const (
SingleDatacenter Datacenter = "SINGLE"
MultiDatacenter Datacenter = "MULTI"
)
// Client is consul client config
type Client struct {
dc Datacenter
cli *api.Client
ctx context.Context
cancel context.CancelFunc
// resolve service entry endpoints
resolver ServiceResolver
// healthcheck time interval in seconds
healthcheckInterval int
// heartbeat enable heartbeat
heartbeat bool
// deregisterCriticalServiceAfter time interval in seconds
deregisterCriticalServiceAfter int
// serviceChecks user custom checks
serviceChecks api.AgentServiceChecks
}
func defaultResolver(_ context.Context, entries []*api.ServiceEntry) []*registry.ServiceInstance {
services := make([]*registry.ServiceInstance, 0, len(entries))
for _, entry := range entries {
var version string
for _, tag := range entry.Service.Tags {
ss := strings.SplitN(tag, "=", 2)
if len(ss) == 2 && ss[0] == "version" {
version = ss[1]
}
}
endpoints := make([]string, 0)
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)
}
if len(endpoints) == 0 && entry.Service.Address != "" && entry.Service.Port != 0 {
endpoints = append(endpoints, fmt.Sprintf("http://%s:%d", entry.Service.Address, entry.Service.Port))
}
services = append(services, ®istry.ServiceInstance{
ID: entry.Service.ID,
Name: entry.Service.Service,
Metadata: entry.Service.Meta,
Version: version,
Endpoints: endpoints,
})
}
return services
}
// ServiceResolver is used to resolve service endpoints
type ServiceResolver func(ctx context.Context, entries []*api.ServiceEntry) []*registry.ServiceInstance
// Service get services from consul
func (c *Client) Service(ctx context.Context, service string, index uint64, passingOnly bool) ([]*registry.ServiceInstance, uint64, error) {
if c.dc == MultiDatacenter {
return c.multiDCService(ctx, service, index, passingOnly)
}
opts := &api.QueryOptions{
WaitIndex: index,
WaitTime: time.Second * 55,
Datacenter: string(c.dc),
}
opts = opts.WithContext(ctx)
if c.dc == SingleDatacenter {
opts.Datacenter = ""
}
entries, meta, err := c.singleDCEntries(service, "", passingOnly, opts)
if err != nil {
return nil, 0, err
}
return c.resolver(ctx, entries), meta.LastIndex, nil
}
func (c *Client) multiDCService(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)
var instances []*registry.ServiceInstance
dcs, err := c.cli.Catalog().Datacenters()
if err != nil {
return nil, 0, err
}
for _, dc := range dcs {
opts.Datacenter = dc
e, m, err := c.singleDCEntries(service, "", passingOnly, opts)
if err != nil {
return nil, 0, err
}
ins := c.resolver(ctx, e)
for _, in := range ins {
if in.Metadata == nil {
in.Metadata = make(map[string]string, 1)
}
in.Metadata["dc"] = dc
}
instances = append(instances, ins...)
opts.WaitIndex = m.LastIndex
}
return instances, opts.WaitIndex, nil
}
func (c *Client) singleDCEntries(service, tag string, passingOnly bool, opts *api.QueryOptions) ([]*api.ServiceEntry, *api.QueryMeta, error) {
return c.cli.Health().Service(service, tag, passingOnly, opts)
}
// Register register service instance to consul
func (c *Client) Register(_ context.Context, svc *registry.ServiceInstance, enableHealthCheck bool) error {
addresses := make(map[string]api.ServiceAddress, len(svc.Endpoints))
checkAddresses := make([]string, 0, len(svc.Endpoints))
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)
checkAddresses = append(checkAddresses, net.JoinHostPort(addr, strconv.FormatUint(port, 10)))
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,
}
if len(checkAddresses) > 0 {
host, portRaw, _ := net.SplitHostPort(checkAddresses[0])
port, _ := strconv.ParseInt(portRaw, 10, 32)
asr.Address = host
asr.Port = int(port)
}
if enableHealthCheck {
for _, address := range checkAddresses {
asr.Checks = append(asr.Checks, &api.AgentServiceCheck{
TCP: address,
Interval: fmt.Sprintf("%ds", c.healthcheckInterval),
DeregisterCriticalServiceAfter: fmt.Sprintf("%ds", c.deregisterCriticalServiceAfter),
Timeout: "5s",
})
}
// custom checks
asr.Checks = append(asr.Checks, c.serviceChecks...)
}
if c.heartbeat {
asr.Checks = append(asr.Checks, &api.AgentServiceCheck{
CheckID: "service:" + svc.ID,
TTL: fmt.Sprintf("%ds", c.healthcheckInterval*2),
DeregisterCriticalServiceAfter: fmt.Sprintf("%ds", c.deregisterCriticalServiceAfter),
})
}
err := c.cli.Agent().ServiceRegister(asr)
if err != nil {
return err
}
if c.heartbeat {
go func() {
time.Sleep(time.Second)
err = c.cli.Agent().UpdateTTL("service:"+svc.ID, "pass", "pass")
if err != nil {
log.Errorf("[Consul]update ttl heartbeat to consul failed!err:=%v", err)
}
ticker := time.NewTicker(time.Second * time.Duration(c.healthcheckInterval))
defer ticker.Stop()
for {
select {
case <-c.ctx.Done():
_ = c.cli.Agent().ServiceDeregister(svc.ID)
return
default:
}
select {
case <-c.ctx.Done():
_ = c.cli.Agent().ServiceDeregister(svc.ID)
return
case <-ticker.C:
// ensure that unregistered services will not be re-registered by mistake
if errors.Is(c.ctx.Err(), context.Canceled) || errors.Is(c.ctx.Err(), context.DeadlineExceeded) {
_ = c.cli.Agent().ServiceDeregister(svc.ID)
return
}
err = c.cli.Agent().UpdateTTLOpts("service:"+svc.ID, "pass", "pass", new(api.QueryOptions).WithContext(c.ctx))
if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
_ = c.cli.Agent().ServiceDeregister(svc.ID)
return
}
if err != nil {
log.Errorf("[Consul] update ttl heartbeat to consul failed! err=%v", err)
// when the previous report fails, try to re register the service
time.Sleep(time.Duration(rand.Intn(5)) * time.Second)
if err := c.cli.Agent().ServiceRegister(asr); err != nil {
log.Errorf("[Consul] re registry service failed!, err=%v", err)
} else {
log.Warn("[Consul] re registry of service occurred success")
}
}
}
}
}()
}
return nil
}
// Deregister service by service ID
func (c *Client) Deregister(_ context.Context, serviceID string) error {
defer c.cancel()
return c.cli.Agent().ServiceDeregister(serviceID)
}