micro/api/resolver/vpath/vpath.go

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// Package vpath resolves using http path and recognised versioned urls
package vpath // import "go.unistack.org/micro/v3/api/resolver/vpath"
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import (
"errors"
"net/http"
"regexp"
"strings"
"go.unistack.org/micro/v3/api/resolver"
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)
// NewResolver creates new vpath api resolver
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func NewResolver(opts ...resolver.Option) resolver.Resolver {
return &vpathResolver{opts: resolver.NewOptions(opts...)}
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}
type vpathResolver struct {
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opts resolver.Options
}
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var re = regexp.MustCompile("^v[0-9]+$")
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// Resolve endpoint
func (r *vpathResolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
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if req.URL.Path == "/" {
return nil, errors.New("unknown name")
}
options := resolver.NewResolveOptions(opts...)
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parts := strings.Split(req.URL.Path[1:], "/")
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if len(parts) == 1 {
return &resolver.Endpoint{
Name: r.withPrefix(parts...),
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Host: req.Host,
Method: req.Method,
Path: req.URL.Path,
Domain: options.Domain,
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}, nil
}
// /v1/foo
if re.MatchString(parts[0]) {
return &resolver.Endpoint{
Name: r.withPrefix(parts[0:2]...),
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Host: req.Host,
Method: req.Method,
Path: req.URL.Path,
Domain: options.Domain,
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}, nil
}
return &resolver.Endpoint{
Name: r.withPrefix(parts[0]),
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Host: req.Host,
Method: req.Method,
Path: req.URL.Path,
Domain: options.Domain,
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}, nil
}
func (r *vpathResolver) String() string {
return "vpath"
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}
// withPrefix transforms "foo" into "go.micro.api.foo"
func (r *vpathResolver) withPrefix(parts ...string) string {
p := r.opts.ServicePrefix
if len(p) > 0 {
parts = append([]string{p}, parts...)
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}
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return strings.Join(parts, ".")
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}