mirror of
https://github.com/hanzoai/proxy.git
synced 2026-10-30 18:23:27 +00:00
zeekayandHanzo Dev
0c86c08514
Pool braided three independent things into one struct — what an upstream can
serve, how to reach it, and how it has been doing — and Dial braided four more:
fencing, selection, failover, transport. Every new policy meant another field
and another branch inside a method nobody outside the package could extend.
There is one type now:
type Exit func(ctx, Need, addr) (net.Conn, error)
A vendor, our own egress, a test double and the composition of a dozen of them
are all that, so the rest of the package is functions that return one. Rule is
Exit to Exit and holds fencing and capability; Order is a ranking over a set and
holds health and session pinning; Try walks an order; Chain composes. A vendor
stops being behaviour and becomes a Gate, which is data with an Exit() on it.
What this buys is that a policy no longer has to be anticipated. Fence wraps a
whole route, so an exit added later cannot miss it — it could before, being a
per-Dial check on a struct anyone could append to. Health hands back its Order
and the Rule that feeds it as a pair, because it is one fact observed in two
places and returning only the Order left the counting to be wired by hand.
Chain is generic: composing endomorphisms is not a fact about proxies.
Co-authored-by: Hanzo Dev <[email protected]>
85 lines
2.6 KiB
Go
85 lines
2.6 KiB
Go
package proxy
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"net"
|
|
"strings"
|
|
"text/template"
|
|
)
|
|
|
|
// Gate is one upstream's coordinates. Data, and only data — what to do with it
|
|
// is Exit, so a deployment can hold a table of these in config without the
|
|
// config format having to describe behaviour.
|
|
//
|
|
// There is one shape because the market has one. NodeMaven, ProxyEmpire, Bright
|
|
// Data, Oxylabs, Smartproxy and IPRoyal all present a single gateway address and
|
|
// carry the routing in the USERNAME, differing only in the words they spell it
|
|
// with. So a vendor is a row, not a driver.
|
|
type Gate struct {
|
|
// Name appears in errors and metrics. Never shown to a caller, who has no
|
|
// business knowing who served them.
|
|
Name string
|
|
// Addr is scheme://host:port, scheme http or socks5.
|
|
Addr string
|
|
// User is a text/template over Need, which is what lets one driver speak
|
|
// every dialect including the conditional parts:
|
|
//
|
|
// acct-4471{{with .Country}}-country-{{.}}{{end}}{{with .Session}}-sid-{{.}}{{end}}
|
|
//
|
|
// A field the caller left empty drops its whole segment, because sending a
|
|
// provider a bare "country-" is an error, not a wildcard.
|
|
User string
|
|
// Pass is resolved from KMS when the table is loaded. Never logged, never
|
|
// returned in an error, never visible to a caller.
|
|
Pass string
|
|
// Zones translates a Kind into this vendor's own word for it.
|
|
Zones map[Kind]string
|
|
}
|
|
|
|
// Exit compiles the gate. It fails here rather than at the first dial, so a
|
|
// typo in a template surfaces at load instead of under traffic.
|
|
func (g Gate) Exit() (Exit, error) {
|
|
if g.Addr == "" {
|
|
return nil, fmt.Errorf("gate %q: no address", g.Name)
|
|
}
|
|
t, err := template.New(g.Name).Parse(g.User)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("gate %q: user template: %w", g.Name, err)
|
|
}
|
|
return func(ctx context.Context, n Need, addr string) (net.Conn, error) {
|
|
c, err := g.dial(ctx, t, n, addr)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("%s: %w", g.Name, err)
|
|
}
|
|
return c, nil
|
|
}, nil
|
|
}
|
|
|
|
// name renders the upstream username for this need.
|
|
func (g Gate) name(t *template.Template, n Need) (string, error) {
|
|
zone := g.Zones[n.Kind]
|
|
if zone == "" {
|
|
zone = n.Kind.String()
|
|
}
|
|
var b strings.Builder
|
|
err := t.Execute(&b, struct{ Country, Kind, Session string }{n.Country, zone, n.Session})
|
|
return b.String(), err
|
|
}
|
|
|
|
func (k Kind) String() string {
|
|
switch k {
|
|
case Datacenter:
|
|
return "datacenter"
|
|
case Residential:
|
|
return "residential"
|
|
case Mobile:
|
|
return "mobile"
|
|
}
|
|
return "any"
|
|
}
|
|
|
|
var kinds = map[string]Kind{
|
|
"any": Any, "datacenter": Datacenter, "residential": Residential, "mobile": Mobile,
|
|
}
|