micro/config/source/consul/consul.go

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2019-05-31 01:11:13 +03:00
package consul
import (
"fmt"
"net"
"time"
"github.com/hashicorp/consul/api"
"github.com/micro/go-micro/config/source"
)
// Currently a single consul reader
type consul struct {
prefix string
stripPrefix string
addr string
opts source.Options
client *api.Client
}
var (
// DefaultPrefix is the prefix that consul keys will be assumed to have if you
// haven't specified one
DefaultPrefix = "/micro/config/"
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)
func (c *consul) Read() (*source.ChangeSet, error) {
kv, _, err := c.client.KV().List(c.prefix, nil)
if err != nil {
return nil, err
}
if kv == nil || len(kv) == 0 {
return nil, fmt.Errorf("source not found: %s", c.prefix)
}
data, err := makeMap(c.opts.Encoder, kv, c.stripPrefix)
if err != nil {
return nil, fmt.Errorf("error reading data: %v", err)
}
b, err := c.opts.Encoder.Encode(data)
if err != nil {
return nil, fmt.Errorf("error reading source: %v", err)
}
cs := &source.ChangeSet{
Timestamp: time.Now(),
Format: c.opts.Encoder.String(),
Source: c.String(),
Data: b,
}
cs.Checksum = cs.Sum()
return cs, nil
}
func (c *consul) String() string {
return "consul"
}
func (c *consul) Watch() (source.Watcher, error) {
w, err := newWatcher(c.prefix, c.addr, c.String(), c.stripPrefix, c.opts.Encoder)
if err != nil {
return nil, err
}
return w, nil
}
// NewSource creates a new consul source
func NewSource(opts ...source.Option) source.Source {
options := source.NewOptions(opts...)
// use default config
config := api.DefaultConfig()
// use the consul config passed in the options if any
if co, ok := options.Context.Value(consulConfigKey{}).(*api.Config); ok {
config = co
}
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// check if there are any addrs
a, ok := options.Context.Value(addressKey{}).(string)
if ok {
addr, port, err := net.SplitHostPort(a)
if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" {
port = "8500"
addr = a
config.Address = fmt.Sprintf("%s:%s", addr, port)
} else if err == nil {
config.Address = fmt.Sprintf("%s:%s", addr, port)
}
}
dc, ok := options.Context.Value(dcKey{}).(string)
if ok {
config.Datacenter = dc
}
token, ok := options.Context.Value(tokenKey{}).(string)
if ok {
config.Token = token
}
// create the client
client, _ := api.NewClient(config)
prefix := DefaultPrefix
sp := ""
f, ok := options.Context.Value(prefixKey{}).(string)
if ok {
prefix = f
}
if b, ok := options.Context.Value(stripPrefixKey{}).(bool); ok && b {
sp = prefix
}
return &consul{
prefix: prefix,
stripPrefix: sp,
addr: config.Address,
opts: options,
client: client,
}
}