TUN-528: Move cloudflared into a separate repo

vendor/zombiezen.com/go/capnproto2/internal/nodemap/BUILD.bazel

@@ -0,0 +1,13 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["nodemap.go"],
+    importpath = "zombiezen.com/go/capnproto2/internal/nodemap",
+    visibility = ["//:__subpackages__"],
+    deps = [
+        "//:go_default_library",
+        "//internal/schema:go_default_library",
+        "//schemas:go_default_library",
+    ],
+)

vendor/zombiezen.com/go/capnproto2/internal/nodemap/nodemap.go

@@ -0,0 +1,58 @@
+// Package nodemap provides a schema registry index type.
+package nodemap
+
+import (
+	"zombiezen.com/go/capnproto2"
+	"zombiezen.com/go/capnproto2/internal/schema"
+	"zombiezen.com/go/capnproto2/schemas"
+)
+
+// Map is a lazy index of a registry.
+// The zero value is an index of the default registry.
+type Map struct {
+	reg   *schemas.Registry
+	nodes map[uint64]schema.Node
+}
+
+func (m *Map) registry() *schemas.Registry {
+	if m.reg != nil {
+		return m.reg
+	}
+	return &schemas.DefaultRegistry
+}
+
+func (m *Map) UseRegistry(reg *schemas.Registry) {
+	m.reg = reg
+	m.nodes = make(map[uint64]schema.Node)
+}
+
+// Find returns the node for the given ID.
+func (m *Map) Find(id uint64) (schema.Node, error) {
+	if n := m.nodes[id]; n.IsValid() {
+		return n, nil
+	}
+	data, err := m.registry().Find(id)
+	if err != nil {
+		return schema.Node{}, err
+	}
+	msg, err := capnp.Unmarshal(data)
+	if err != nil {
+		return schema.Node{}, err
+	}
+	req, err := schema.ReadRootCodeGeneratorRequest(msg)
+	if err != nil {
+		return schema.Node{}, err
+	}
+	nodes, err := req.Nodes()
+	if err != nil {
+		return schema.Node{}, err
+	}
+	if m.nodes == nil {
+		m.nodes = make(map[uint64]schema.Node)
+	}
+	for i := 0; i < nodes.Len(); i++ {
+		n := nodes.At(i)
+		m.nodes[n.Id()] = n
+	}
+	return m.nodes[id], nil
+}