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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2025 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package assemblestate
import (
"errors"
"fmt"
"io"
"sort"
"strconv"
"strings"
"github.com/snapcore/snapd/asserts"
)
// AssertionDevices converts the data returned by an assembly session into the
// data structure used by the "devices" block of a cluster assertion.
func AssertionDevices(ids []Identity, routes Routes) ([]any, error) {
addresses, err := addressesFromRoutes(routes)
if err != nil {
return nil, err
}
serials := make(map[DeviceToken]*asserts.Serial, len(ids))
for _, identity := range ids {
serial, err := serialFromBundle(identity.SerialBundle)
if err != nil {
return nil, fmt.Errorf("cannot parse serial bundle for device %q: %w", identity.RDT, err)
}
if _, ok := serials[identity.RDT]; ok {
return nil, fmt.Errorf("duplicate device token found in identities: %q", identity.RDT)
}
serials[identity.RDT] = serial
}
// sort identities based on brand, model, then serial so that numeric id
// assignment is consistent, even across multiple assemble sessions.
sort.Slice(ids, func(i, j int) bool {
left := serials[ids[i].RDT]
right := serials[ids[j].RDT]
if left.BrandID() != right.BrandID() {
return left.BrandID() < right.BrandID()
}
if left.Model() != right.Model() {
return left.Model() < right.Model()
}
return left.Serial() < right.Serial()
})
devices := make([]any, 0, len(ids))
for i, identity := range ids {
addrs := addresses[identity.RDT]
if len(addrs) == 0 {
return nil, fmt.Errorf("no addresses available for device %q", identity.RDT)
}
serial := serials[identity.RDT]
devices = append(devices, map[string]any{
"id": strconv.Itoa(i + 1),
"device": serial.DeviceID().String(),
"addresses": addrs,
})
}
return devices, nil
}
func serialFromBundle(bundle string) (*asserts.Serial, error) {
decoder := asserts.NewDecoder(strings.NewReader(bundle))
for {
assertion, err := decoder.Decode()
if err != nil {
if err == io.EOF {
break
}
return nil, fmt.Errorf("cannot decode serial bundle: %w", err)
}
if assertion.Type() == asserts.SerialType {
serial, ok := assertion.(*asserts.Serial)
if !ok {
return nil, fmt.Errorf("internal error: serial assertion has unexpected type %T", assertion)
}
return serial, nil
}
}
return nil, errors.New("serial assertion not found in bundle")
}
func addressesFromRoutes(routes Routes) (map[DeviceToken][]any, error) {
if len(routes.Routes)%3 != 0 {
return nil, errors.New("routes array length must be multiple of 3")
}
addressSets := make(map[DeviceToken]map[string]bool)
// TODO:GOVERSION: we repeat this iteration and validation construct a lot,
// real iterators would be a good fit here
for i := 0; i < len(routes.Routes); i += 3 {
src := routes.Routes[i]
dest := routes.Routes[i+1]
addrIdx := routes.Routes[i+2]
if src < 0 || src >= len(routes.Devices) {
return nil, fmt.Errorf("invalid source device index %d in routes", src)
}
if dest < 0 || dest >= len(routes.Devices) {
return nil, fmt.Errorf("invalid destination device index %d in routes", dest)
}
if addrIdx < 0 || addrIdx >= len(routes.Addresses) {
return nil, fmt.Errorf("invalid address index %d in routes", addrIdx)
}
destRDT := routes.Devices[dest]
addr := routes.Addresses[addrIdx]
if addressSets[destRDT] == nil {
addressSets[destRDT] = make(map[string]bool)
}
addressSets[destRDT][addr] = true
}
addresses := make(map[DeviceToken][]any, len(addressSets))
for rdt, set := range addressSets {
sorted := make([]string, 0, len(set))
for addr := range set {
sorted = append(sorted, addr)
}
sort.Strings(sorted)
addrs := make([]any, 0, len(sorted))
for _, addr := range sorted {
addrs = append(addrs, addr)
}
addresses[rdt] = addrs
}
return addresses, nil
}
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