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catalog_services.go
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catalog_services.go
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package dependency
import (
"encoding/gob"
"fmt"
"log"
"net/url"
"regexp"
"sort"
"github.com/pkg/errors"
)
var (
// Ensure implements
_ Dependency = (*CatalogServicesQuery)(nil)
// CatalogServicesQueryRe is the regular expression to use for CatalogNodesQuery.
CatalogServicesQueryRe = regexp.MustCompile(`\A` + dcRe + `\z`)
)
func init() {
gob.Register([]*CatalogSnippet{})
}
// CatalogSnippet is a catalog entry in Consul.
type CatalogSnippet struct {
Name string
Tags ServiceTags
}
// CatalogServicesQuery is the representation of a requested catalog service
// dependency from inside a template.
type CatalogServicesQuery struct {
stopCh chan struct{}
dc string
}
// NewCatalogServicesQuery parses a string of the format @dc.
func NewCatalogServicesQuery(s string) (*CatalogServicesQuery, error) {
if !CatalogServicesQueryRe.MatchString(s) {
return nil, fmt.Errorf("catalog.services: invalid format: %q", s)
}
m := regexpMatch(CatalogServicesQueryRe, s)
return &CatalogServicesQuery{
stopCh: make(chan struct{}, 1),
dc: m["dc"],
}, nil
}
// Fetch queries the Consul API defined by the given client and returns a slice
// of CatalogService objects.
func (d *CatalogServicesQuery) Fetch(clients *ClientSet, opts *QueryOptions) (interface{}, *ResponseMetadata, error) {
select {
case <-d.stopCh:
return nil, nil, ErrStopped
default:
}
opts = opts.Merge(&QueryOptions{
Datacenter: d.dc,
})
log.Printf("[TRACE] %s: GET %s", d, &url.URL{
Path: "/v1/catalog/services",
RawQuery: opts.String(),
})
entries, qm, err := clients.Consul().Catalog().Services(opts.ToConsulOpts())
if err != nil {
return nil, nil, errors.Wrap(err, d.String())
}
log.Printf("[TRACE] %s: returned %d results", d, len(entries))
var catalogServices []*CatalogSnippet
for name, tags := range entries {
catalogServices = append(catalogServices, &CatalogSnippet{
Name: name,
Tags: ServiceTags(deepCopyAndSortTags(tags)),
})
}
sort.Stable(ByName(catalogServices))
rm := &ResponseMetadata{
LastIndex: qm.LastIndex,
LastContact: qm.LastContact,
}
return catalogServices, rm, nil
}
// CanShare returns a boolean if this dependency is shareable.
func (d *CatalogServicesQuery) CanShare() bool {
return true
}
// String returns the human-friendly version of this dependency.
func (d *CatalogServicesQuery) String() string {
if d.dc != "" {
return fmt.Sprintf("catalog.services(@%s)", d.dc)
}
return "catalog.services"
}
// Stop halts the dependency's fetch function.
func (d *CatalogServicesQuery) Stop() {
close(d.stopCh)
}
// Type returns the type of this dependency.
func (d *CatalogServicesQuery) Type() Type {
return TypeConsul
}
// ByName is a sortable slice of CatalogService structs.
type ByName []*CatalogSnippet
func (s ByName) Len() int { return len(s) }
func (s ByName) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s ByName) Less(i, j int) bool { return s[i].Name < s[j].Name }