51 lines
1.9 KiB
Go
51 lines
1.9 KiB
Go
package client
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import (
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"math/rand"
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"github.com/micro/go-micro/v3/errors"
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"github.com/micro/go-micro/v3/router"
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"github.com/micro/go-micro/v3/selector"
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pnet "github.com/micro/go-micro/v3/util/net"
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)
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// LookupRoute for a request using the router and then choose one using the selector
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func LookupRoute(req Request, opts CallOptions) (*router.Route, error) {
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// check to see if the proxy has been set, if it has we don't need to lookup the routes; net.Proxy
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// returns a slice of addresses, so we'll use a random one. Eventually we should to use the
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// selector for this.
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service, addresses, _ := pnet.Proxy(req.Service(), opts.Address)
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if len(addresses) > 0 {
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return &router.Route{
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Service: service,
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Address: addresses[rand.Int()%len(addresses)],
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}, nil
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}
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// construct the router query
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query := []router.QueryOption{router.QueryService(req.Service())}
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// if a custom network was requested, pass this to the router. By default the router will use it's
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// own network, which is set during initialisation.
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if len(opts.Network) > 0 {
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query = append(query, router.QueryNetwork(opts.Network))
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}
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// lookup the routes which can be used to execute the request
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routes, err := opts.Router.Lookup(query...)
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if err == router.ErrRouteNotFound {
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return nil, errors.InternalServerError("go.micro.client", "service %s: %s", req.Service(), err.Error())
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} else if err != nil {
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return nil, errors.InternalServerError("go.micro.client", "error getting next %s node: %s", req.Service(), err.Error())
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}
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// select the route to use for the request
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if route, err := opts.Selector.Select(routes, opts.SelectOptions...); err == selector.ErrNoneAvailable {
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return nil, errors.InternalServerError("go.micro.client", "service %s: %s", req.Service(), err.Error())
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} else if err != nil {
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return nil, errors.InternalServerError("go.micro.client", "error getting next %s node: %s", req.Service(), err.Error())
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} else {
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return route, nil
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}
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}
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