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