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package nodeagent
import (
"context"
"log/slog"
"strings"
"github.com/johnandersen777/socialweb-computer-kcp/internal/systemdunit"
)
const (
UnitBootstrap = "socialweb-node-bootstrap.service"
UnitPrep = "socialweb-node-prep.service"
UnitSecretsFetch = "setup-secrets.service"
UnitGuestSecrets = "socialweb-guest-secrets.service"
UnitK3sAgent = "socialweb-k3s-agent.service"
UnitDNSLink = "socialweb-node-dns-link.service"
UnitMasquerade = "socialweb-pod-masquerade.service"
UnitCNI = "socialweb-pod-cni.service"
UnitDiagnose = "socialweb-node-diagnose.service"
UnitMeshdInstall = "socialweb-meshd-install.service"
UnitMeshd = "socialweb-meshd.service"
)
func Units(cfg Config) []systemdunit.Unit {
prep := systemdunit.Unit{Name: UnitPrep, Sections: []systemdunit.Section{
{Name: "Unit", Entries: []systemdunit.KeyValue{
systemdunit.KV("Description", "socialweb node: fetch the join secrets and supervise the cluster links"),
systemdunit.KV("After", "network-online.target "+UnitSecretsFetch+" "+UnitGuestSecrets),
systemdunit.KV("Wants", "network-online.target "+UnitGuestSecrets),
systemdunit.KV("StartLimitIntervalSec", "0"),
}},
{Name: "Service", Entries: []systemdunit.KeyValue{
systemdunit.KV("Type", "notify"),
systemdunit.KV("ExecStart", cfg.NodeBinaryPath+" join --config "+cfg.ConfigPath),
systemdunit.KV("Restart", "always"),
systemdunit.KV("RestartSec", "5"),
systemdunit.KV("NotifyAccess", "main"),
systemdunit.KV("TimeoutStartSec", "infinity"),
systemdunit.KV("StandardOutput", "journal+console"),
systemdunit.KV("StandardError", "journal+console"),
}},
{Name: "Install", Entries: []systemdunit.KeyValue{systemdunit.KV("WantedBy", "multi-user.target")}},
}}
k3sAgent := systemdunit.Unit{Name: UnitK3sAgent, Sections: []systemdunit.Section{
{Name: "Unit", Entries: []systemdunit.KeyValue{
systemdunit.KV("Description", "socialweb node: k3s agent joined through the apiserver link"),
systemdunit.KV("After", "network-online.target "+UnitPrep+" "+UnitDNSLink+" "+UnitMasquerade),
systemdunit.KV("Wants", "network-online.target "+UnitPrep+" "+UnitDNSLink+" "+UnitMasquerade),
systemdunit.KV("StartLimitIntervalSec", "0"),
}},
{Name: "Service", Entries: []systemdunit.KeyValue{
systemdunit.KV("Type", "notify"),
systemdunit.KV("EnvironmentFile", cfg.APIServerEnvPath),
systemdunit.KV("KillMode", "process"),
systemdunit.KV("Delegate", "yes"),
systemdunit.KV("LimitNOFILE", "1048576"),
systemdunit.KV("LimitNPROC", "infinity"),
systemdunit.KV("LimitCORE", "infinity"),
systemdunit.KV("TasksMax", "infinity"),
systemdunit.KV("TimeoutStartSec", "0"),
systemdunit.KV("ExecStartPre", "-/sbin/modprobe br_netfilter"),
systemdunit.KV("ExecStartPre", "-/sbin/modprobe overlay"),
systemdunit.KV("ExecStartPre", "/usr/bin/test -x "+cfg.K3sPath),
systemdunit.KV("ExecStartPre", "/usr/bin/test -s "+cfg.TokenPath),
systemdunit.KV("ExecStartPre", cfg.NodeBinaryPath+" hostname --config "+cfg.ConfigPath),
systemdunit.KV("ExecStart", cfg.K3sPath+" agent --server https://${ADVERTISE_ADDRESS}:${APISERVER_PORT} --token-file "+
cfg.TokenPath+" --node-name ${NODE_NAME} --data-dir "+cfg.K3sDataDir+
" --kubelet-arg=cluster-dns="+NodeLocalDNSAddress+" --node-label=socialweb.computer/node-local-dns=true"),
systemdunit.KV("Restart", "always"),
systemdunit.KV("RestartSec", "5"),
systemdunit.KV("StandardOutput", "journal+console"),
systemdunit.KV("StandardError", "journal+console"),
}},
{Name: "Install", Entries: []systemdunit.KeyValue{systemdunit.KV("WantedBy", "multi-user.target")}},
}}
dnsLink := oneshotUnit(UnitDNSLink, "socialweb node: the per-node DNS address on a dummy interface",
nil, nil, cfg.NodeBinaryPath+" dns-link --config "+cfg.ConfigPath, true, true)
masquerade := oneshotUnit(UnitMasquerade, "socialweb node: forward pod traffic and SNAT only what leaves the cluster CIDR",
nil, nil, cfg.NodeBinaryPath+" masquerade --config "+cfg.ConfigPath, true, true)
cni := systemdunit.Unit{Name: UnitCNI, Sections: []systemdunit.Section{
{Name: "Unit", Entries: []systemdunit.KeyValue{
systemdunit.KV("Description", "socialweb node: bridge CNI on the Node's podCIDR, once the Node has registered"),
systemdunit.KV("After", UnitPrep),
systemdunit.KV("Wants", UnitPrep),
systemdunit.KV("StartLimitIntervalSec", "0"),
}},
{Name: "Service", Entries: []systemdunit.KeyValue{
systemdunit.KV("Type", "oneshot"),
systemdunit.KV("RemainAfterExit", "yes"),
systemdunit.KV("EnvironmentFile", cfg.APIServerEnvPath),
systemdunit.KV("ExecStart", cfg.NodeBinaryPath+" cni --config "+cfg.ConfigPath),
systemdunit.KV("Restart", "on-failure"),
systemdunit.KV("RestartSec", "5"),
systemdunit.KV("TimeoutStartSec", "infinity"),
systemdunit.KV("StandardOutput", "journal+console"),
systemdunit.KV("StandardError", "journal+console"),
}},
{Name: "Install", Entries: []systemdunit.KeyValue{systemdunit.KV("WantedBy", "multi-user.target")}},
}}
diagnose := oneshotUnit(UnitDiagnose, "socialweb node: print containerd's CNI status to the console until the node network is ready",
nil, nil, cfg.NodeBinaryPath+" diagnose --config "+cfg.ConfigPath, false, true)
out := []systemdunit.Unit{prep, k3sAgent, dnsLink, masquerade, cni, diagnose}
if cfg.Meshd != nil {
install := oneshotUnit(UnitMeshdInstall, "socialweb node: install the sha256-pinned socialweb-meshd",
[]string{"network-online.target"}, []string{"network-online.target"},
cfg.NodeBinaryPath+" install-meshd --config "+cfg.ConfigPath, true, true)
mesh := systemdunit.Unit{Name: UnitMeshd, Sections: []systemdunit.Section{
{Name: "Unit", Entries: []systemdunit.KeyValue{
systemdunit.KV("Description", "socialweb.computer pod mesh over iroh (socialweb-meshd)"),
systemdunit.KV("Wants", "network-online.target"),
systemdunit.KV("After", "network-online.target"),
}},
{Name: "Service", Entries: []systemdunit.KeyValue{
systemdunit.KV("Type", "notify"),
systemdunit.KV("NotifyAccess", "main"),
systemdunit.KV("TimeoutStartSec", "infinity"),
systemdunit.KV("EnvironmentFile", cfg.MeshdEnvPath),
systemdunit.KV("ExecStart", cfg.MeshdPath+" run --kubeconfig "+cfg.KubeletKubeconfig+" --secret-file /var/lib/socialweb/meshd/secret"),
systemdunit.KV("Restart", "always"),
systemdunit.KV("RestartSec", "2"),
systemdunit.KV("StateDirectory", "socialweb/meshd"),
systemdunit.KV("StateDirectoryMode", "0700"),
}},
{Name: "Install", Entries: []systemdunit.KeyValue{systemdunit.KV("WantedBy", "multi-user.target")}},
}, DropIns: []systemdunit.DropIn{{Name: "10-socialweb-node.conf", Sections: []systemdunit.Section{
{Name: "Unit", Entries: []systemdunit.KeyValue{
systemdunit.KV("After", UnitMeshdInstall+" "+UnitPrep),
systemdunit.KV("Wants", UnitMeshdInstall+" "+UnitPrep),
systemdunit.KV("StartLimitIntervalSec", "0"),
}},
}}}}
out = append(out, install, mesh)
}
return out
}
func oneshotUnit(name, description string, after, wants []string, exec string, restart, install bool) systemdunit.Unit {
unitEntries := []systemdunit.KeyValue{systemdunit.KV("Description", description)}
if len(after) > 0 {
unitEntries = append(unitEntries, systemdunit.KV("After", joinStrings(after)))
}
if len(wants) > 0 {
unitEntries = append(unitEntries, systemdunit.KV("Wants", joinStrings(wants)))
}
unitEntries = append(unitEntries, systemdunit.KV("StartLimitIntervalSec", "0"))
service := []systemdunit.KeyValue{
systemdunit.KV("Type", "oneshot"),
systemdunit.KV("RemainAfterExit", "yes"),
systemdunit.KV("ExecStart", exec),
}
if restart {
service = append(service, systemdunit.KV("Restart", "on-failure"), systemdunit.KV("RestartSec", "5"))
}
service = append(service,
systemdunit.KV("StandardOutput", "journal+console"),
systemdunit.KV("StandardError", "journal+console"))
unit := systemdunit.Unit{Name: name, Sections: []systemdunit.Section{
{Name: "Unit", Entries: unitEntries},
{Name: "Service", Entries: service},
}}
if install {
unit.Sections = append(unit.Sections, systemdunit.Section{Name: "Install",
Entries: []systemdunit.KeyValue{systemdunit.KV("WantedBy", "multi-user.target")}})
}
return unit
}
func joinStrings(values []string) string {
var out strings.Builder
for i, value := range values {
if i > 0 {
out.WriteString(" ")
}
out.WriteString(value)
}
return out.String()
}
func UnitFiles(cfg Config) []systemdunit.File {
return systemdunit.Files(DefaultUnitDir, Units(cfg)...)
}
func UnitNames(cfg Config) []string {
names := []string{UnitPrep, UnitK3sAgent, UnitDNSLink, UnitMasquerade, UnitCNI, UnitDiagnose}
if cfg.Meshd != nil {
names = append(names, UnitMeshdInstall, UnitMeshd)
}
return names
}
func InstallUnits(root string, cfg Config) error { return systemdunit.Install(root, UnitFiles(cfg)) }
func StartUnits(ctx context.Context, cfg Config, log *slog.Logger) error {
if log == nil {
log = slog.Default()
}
controller := systemdunit.Controller{}
names := UnitNames(cfg)
if err := controller.DaemonReload(ctx); err != nil {
return err
}
if err := controller.Enable(ctx, names...); err != nil {
return err
}
if err := controller.StartNoBlock(ctx, names...); err != nil {
return err
}
log.Info("enabled and started the node units", "units", joinStrings(names))
return nil
}
