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Move daemon sub-process logic into daemon package

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This commit is contained in:
Brian Picciano 2024-06-17 20:51:02 +02:00
parent aa1a8ea806
commit a8893e4fc6
11 changed files with 560 additions and 426 deletions
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84
go/cmd/entrypoint/admin.go
View File

@ -1,7 +1,6 @@
package main
import (
"context"
"crypto/rand"
"encoding/hex"
"errors"
@ -15,7 +14,6 @@ import (
"os"
"strings"
"code.betamike.com/micropelago/pmux/pmuxlib"
"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
)
@ -164,54 +162,30 @@ var subCmdAdminCreateNetwork = subCmd{
return fmt.Errorf("initializing bootstrap data: %w", err)
}
if hostBootstrap, daemonConfig, err = coalesceDaemonConfigAndBootstrap(hostBootstrap, daemonConfig); err != nil {
if hostBootstrap, err = coalesceDaemonConfigAndBootstrap(hostBootstrap, daemonConfig); err != nil {
return fmt.Errorf("merging daemon config into bootstrap data: %w", err)
}
nebulaPmuxProcConfig, err := nebulaPmuxProcConfig(hostBootstrap, daemonConfig)
daemonInst, err := daemon.New(
ctx,
logger.WithNamespace("daemon"),
daemonConfig,
hostBootstrap,
envRuntimeDirPath,
envBinDirPath,
&daemon.Opts{
// SkipHostBootstrapPush is required, because the global bucket
// hasn't actually been initialized yet, so there's nowhere to
// push to.
SkipHostBootstrapPush: true,
// NOTE both stdout and stderr are sent to stderr, so that the
// user can pipe the resulting admin.json to stdout.
Stdout: os.Stderr,
},
)
if err != nil {
return fmt.Errorf("generating nebula config: %w", err)
}
garagePmuxProcConfigs, err := garagePmuxProcConfigs(hostBootstrap, daemonConfig)
if err != nil {
return fmt.Errorf("generating garage configs: %w", err)
}
pmuxConfig := pmuxlib.Config{
Processes: append(
[]pmuxlib.ProcessConfig{
nebulaPmuxProcConfig,
},
garagePmuxProcConfigs...,
),
}
ctx, cancel := context.WithCancel(ctx)
pmuxDoneCh := make(chan struct{})
logger.Info(ctx, "starting child processes")
go func() {
// NOTE both stdout and stderr are sent to stderr, so that the user
// can pipe the resulting admin.json to stdout.
pmuxlib.Run(ctx, os.Stderr, os.Stderr, pmuxConfig)
close(pmuxDoneCh)
}()
defer func() {
cancel()
logger.Info(ctx, "waiting for child processes to exit")
<-pmuxDoneCh
}()
logger.Info(ctx, "waiting for garage instances to come online")
if err := waitForGarageAndNebula(ctx, logger, hostBootstrap, daemonConfig); err != nil {
return fmt.Errorf("waiting for garage to start up: %w", err)
}
logger.Info(ctx, "applying initial garage layout")
if err := garageApplyLayout(ctx, logger, hostBootstrap, daemonConfig); err != nil {
return fmt.Errorf("applying initial garage layout: %w", err)
return fmt.Errorf("initializing daemon: %w", err)
}
logger.Info(ctx, "initializing garage shared global bucket")
@ -219,6 +193,17 @@ var subCmdAdminCreateNetwork = subCmd{
ctx, logger, hostBootstrap, daemonConfig,
)
if cErr := (garage.AdminClientError{}); errors.As(err, &cErr) && cErr.StatusCode == 409 {
return fmt.Errorf("shared global bucket has already been created, are the storage allocations from a previously initialized isle being used?")
} else if err != nil {
return fmt.Errorf("initializing garage shared global bucket: %w", err)
}
if err := daemonInst.Shutdown(ctx); err != nil {
return fmt.Errorf("shutting down daemon: %w (this can mean there are zombie children leftover)", err)
}
hostBootstrap.Garage.GlobalBucketS3APICredentials = garageGlobalBucketCreds
// rewrite the bootstrap now that the global bucket creds have been
@ -227,13 +212,6 @@ var subCmdAdminCreateNetwork = subCmd{
return fmt.Errorf("writing bootstrap file: %w", err)
}
if cErr := (garage.AdminClientError{}); errors.As(err, &cErr) && cErr.StatusCode == 409 {
return fmt.Errorf("shared global bucket has already been created, are the storage allocations from a previously initialized isle being used?")
} else if err != nil {
return fmt.Errorf("initializing garage shared global bucket: %w", err)
}
logger.Info(ctx, "cluster initialized successfully, writing admin.json to stdout")
adm := admin.Admin{

94
go/cmd/entrypoint/daemon.go
View File

@ -7,13 +7,11 @@ import (
"fmt"
"io/fs"
"os"
"sync"
"time"
"isle/bootstrap"
"isle/daemon"
"code.betamike.com/micropelago/pmux/pmuxlib"
"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
)
@ -94,77 +92,27 @@ func runDaemonPmuxOnce(
) (
bootstrap.Bootstrap, error,
) {
nebulaPmuxProcConfig, err := nebulaPmuxProcConfig(hostBootstrap, daemonConfig)
daemonInst, err := daemon.New(
ctx,
logger.WithNamespace("daemon"),
daemonConfig,
hostBootstrap,
envRuntimeDirPath,
envBinDirPath,
nil,
)
if err != nil {
return bootstrap.Bootstrap{}, fmt.Errorf("generating nebula config: %w", err)
return bootstrap.Bootstrap{}, fmt.Errorf("initializing daemon: %w", err)
}
dnsmasqPmuxProcConfig, err := dnsmasqPmuxProcConfig(hostBootstrap, daemonConfig)
if err != nil {
return bootstrap.Bootstrap{}, fmt.Errorf("generating dnsmasq config: %w", err)
}
garagePmuxProcConfigs, err := garagePmuxProcConfigs(hostBootstrap, daemonConfig)
if err != nil {
return bootstrap.Bootstrap{}, fmt.Errorf("generating garage children configs: %w", err)
}
pmuxConfig := pmuxlib.Config{
Processes: append(
[]pmuxlib.ProcessConfig{
nebulaPmuxProcConfig,
dnsmasqPmuxProcConfig,
},
garagePmuxProcConfigs...,
),
}
var wg sync.WaitGroup
defer wg.Wait()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
wg.Add(1)
go func() {
defer wg.Done()
pmuxlib.Run(ctx, os.Stdout, os.Stderr, pmuxConfig)
defer func() {
// context.Background() is deliberate here. At this point the entire
// process is shutting down, so whatever owns the process should decide
// when it's been too long.
if err := daemonInst.Shutdown(context.Background()); err != nil {
logger.Error(ctx, "failed to cleanly shutdown daemon", err)
}
}()
if err := waitForGarageAndNebula(ctx, logger, hostBootstrap, daemonConfig); err != nil {
return bootstrap.Bootstrap{}, fmt.Errorf("waiting for nebula/garage to start up: %w", err)
}
if len(daemonConfig.Storage.Allocations) > 0 {
err := doOnce(ctx, func(ctx context.Context) error {
if err := garageApplyLayout(ctx, logger, hostBootstrap, daemonConfig); err != nil {
logger.Error(ctx, "applying garage layout", err)
return err
}
return nil
})
if err != nil {
return bootstrap.Bootstrap{}, fmt.Errorf("applying garage layout: %w", err)
}
}
err = doOnce(ctx, func(ctx context.Context) error {
if err := hostBootstrap.PutGarageBoostrapHost(ctx); err != nil {
logger.Error(ctx, "updating host info in garage", err)
return err
}
return nil
})
if err != nil {
return bootstrap.Bootstrap{}, fmt.Errorf("updating host info in garage: %w", err)
}
ticker := time.NewTicker(3 * time.Minute)
defer ticker.Stop()
@ -176,7 +124,7 @@ func runDaemonPmuxOnce(
case <-ticker.C:
fmt.Fprintln(os.Stderr, "checking for changes to bootstrap")
logger.Info(ctx, "checking for changes to bootstrap")
var (
changed bool
@ -301,9 +249,9 @@ var subCmdDaemon = subCmd{
// we update this Host's data using whatever configuration has been
// provided by the daemon config. This way the daemon has the most
// up-to-date possible bootstrap. This updated bootstrap will later get
// updated in garage using bootstrap.PutGarageBoostrapHost, so other
// hosts will see it as well.
if hostBootstrap, daemonConfig, err = coalesceDaemonConfigAndBootstrap(hostBootstrap, daemonConfig); err != nil {
// updated in garage as a background daemon task, so other hosts will
// see it as well.
if hostBootstrap, err = coalesceDaemonConfigAndBootstrap(hostBootstrap, daemonConfig); err != nil {
return fmt.Errorf("merging daemon config into bootstrap data: %w", err)
}

22
go/cmd/entrypoint/daemon_util.go
View File

@ -1,19 +1,17 @@
package main
import (
"context"
"fmt"
"isle/bootstrap"
"isle/daemon"
"isle/garage/garagesrv"
"time"
)
func coalesceDaemonConfigAndBootstrap(
hostBootstrap bootstrap.Bootstrap,
daemonConfig daemon.Config,
) (
bootstrap.Bootstrap, daemon.Config, error,
bootstrap.Bootstrap, error,
) {
host := bootstrap.Host{
@ -31,7 +29,7 @@ func coalesceDaemonConfigAndBootstrap(
id, rpcPort, err := garagesrv.InitAlloc(alloc.MetaPath, alloc.RPCPort)
if err != nil {
return bootstrap.Bootstrap{}, daemon.Config{}, fmt.Errorf("initializing alloc at %q: %w", alloc.MetaPath, err)
return bootstrap.Bootstrap{}, fmt.Errorf("initializing alloc at %q: %w", alloc.MetaPath, err)
}
host.Garage.Instances = append(host.Garage.Instances, bootstrap.GarageHostInstance{
@ -47,20 +45,8 @@ func coalesceDaemonConfigAndBootstrap(
hostBootstrap.Hosts[host.Name] = host
if err := writeBootstrapToDataDir(hostBootstrap); err != nil {
return bootstrap.Bootstrap{}, daemon.Config{}, fmt.Errorf("writing bootstrap file: %w", err)
return bootstrap.Bootstrap{}, fmt.Errorf("writing bootstrap file: %w", err)
}
return hostBootstrap, daemonConfig, nil
}
func doOnce(ctx context.Context, fn func(context.Context) error) error {
for {
if err := fn(ctx); err == nil {
return nil
} else if ctxErr := ctx.Err(); ctxErr != nil {
return ctxErr
}
time.Sleep(1 * time.Second)
}
return hostBootstrap, nil
}

206
go/cmd/entrypoint/garage_util.go
View File

@ -6,177 +6,10 @@ import (
"isle/bootstrap"
"isle/daemon"
"isle/garage"
"isle/garage/garagesrv"
"net"
"path/filepath"
"strconv"
"code.betamike.com/micropelago/pmux/pmuxlib"
"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
)
func garageAdminClientLogger(logger *mlog.Logger) *mlog.Logger {
return logger.WithNamespace("garageAdminClient")
}
// newGarageAdminClient will return an AdminClient for a local garage instance,
// or it will _panic_ if there is no local instance configured.
func newGarageAdminClient(
logger *mlog.Logger,
hostBootstrap bootstrap.Bootstrap,
daemonConfig daemon.Config,
) *garage.AdminClient {
thisHost := hostBootstrap.ThisHost()
return garage.NewAdminClient(
garageAdminClientLogger(logger),
net.JoinHostPort(
thisHost.IP().String(),
strconv.Itoa(daemonConfig.Storage.Allocations[0].AdminPort),
),
hostBootstrap.Garage.AdminToken,
)
}
func waitForGarageAndNebula(
ctx context.Context,
logger *mlog.Logger,
hostBootstrap bootstrap.Bootstrap,
daemonConfig daemon.Config,
) error {
if err := waitForNebula(ctx, hostBootstrap); err != nil {
return fmt.Errorf("waiting for nebula to start: %w", err)
}
allocs := daemonConfig.Storage.Allocations
// if this host doesn't have any allocations specified then fall back to
// waiting for nebula
if len(allocs) == 0 {
return nil
}
adminClientLogger := garageAdminClientLogger(logger)
for _, alloc := range allocs {
adminAddr := net.JoinHostPort(
hostBootstrap.ThisHost().IP().String(),
strconv.Itoa(alloc.AdminPort),
)
adminClient := garage.NewAdminClient(
adminClientLogger,
adminAddr,
hostBootstrap.Garage.AdminToken,
)
ctx := mctx.Annotate(ctx, "garageAdminAddr", adminAddr)
logger.Debug(ctx, "wating for garage instance to start")
if err := adminClient.Wait(ctx); err != nil {
return fmt.Errorf("waiting for garage instance %q to start up: %w", adminAddr, err)
}
}
return nil
}
// bootstrapGarageHostForAlloc returns the bootstrap.GarageHostInstance which
// corresponds with the given alloc from the daemon config. This will panic if
// no associated instance can be found.
//
// This assumes that coalesceDaemonConfigAndBootstrap has already been called.
func bootstrapGarageHostForAlloc(
host bootstrap.Host,
alloc daemon.ConfigStorageAllocation,
) bootstrap.GarageHostInstance {
for _, inst := range host.Garage.Instances {
if inst.RPCPort == alloc.RPCPort {
return inst
}
}
panic(fmt.Sprintf("could not find alloc %+v in the bootstrap data", alloc))
}
func garageWriteChildConfig(
hostBootstrap bootstrap.Bootstrap,
alloc daemon.ConfigStorageAllocation,
) (
string, error,
) {
thisHost := hostBootstrap.ThisHost()
id := bootstrapGarageHostForAlloc(thisHost, alloc).ID
peer := garage.LocalPeer{
RemotePeer: garage.RemotePeer{
ID: id,
IP: thisHost.IP().String(),
RPCPort: alloc.RPCPort,
S3APIPort: alloc.S3APIPort,
},
AdminPort: alloc.AdminPort,
}
garageTomlPath := filepath.Join(
envRuntimeDirPath, fmt.Sprintf("garage-%d.toml", alloc.RPCPort),
)
err := garagesrv.WriteGarageTomlFile(garageTomlPath, garagesrv.GarageTomlData{
MetaPath: alloc.MetaPath,
DataPath: alloc.DataPath,
RPCSecret: hostBootstrap.Garage.RPCSecret,
AdminToken: hostBootstrap.Garage.AdminToken,
LocalPeer: peer,
BootstrapPeers: hostBootstrap.GaragePeers(),
})
if err != nil {
return "", fmt.Errorf("creating garage.toml file at %q: %w", garageTomlPath, err)
}
return garageTomlPath, nil
}
func garagePmuxProcConfigs(
hostBootstrap bootstrap.Bootstrap,
daemonConfig daemon.Config,
) (
[]pmuxlib.ProcessConfig, error,
) {
var pmuxProcConfigs []pmuxlib.ProcessConfig
for _, alloc := range daemonConfig.Storage.Allocations {
childConfigPath, err := garageWriteChildConfig(hostBootstrap, alloc)
if err != nil {
return nil, fmt.Errorf("writing child config file for alloc %+v: %w", alloc, err)
}
pmuxProcConfigs = append(pmuxProcConfigs, pmuxlib.ProcessConfig{
Name: fmt.Sprintf("garage-%d", alloc.RPCPort),
Cmd: binPath("garage"),
Args: []string{"-c", childConfigPath, "server"},
StartAfterFunc: func(ctx context.Context) error {
return waitForNebula(ctx, hostBootstrap)
},
})
}
return pmuxProcConfigs, nil
}
func garageInitializeGlobalBucket(
ctx context.Context,
logger *mlog.Logger,
@ -185,7 +18,9 @@ func garageInitializeGlobalBucket(
) (
garage.S3APICredentials, error,
) {
adminClient := newGarageAdminClient(logger, hostBootstrap, daemonConfig)
adminClient := daemon.NewGarageAdminClient(
logger, hostBootstrap, daemonConfig,
)
creds, err := adminClient.CreateS3APICredentials(
ctx, garage.GlobalBucketS3APICredentialsName,
@ -213,38 +48,3 @@ func garageInitializeGlobalBucket(
return creds, nil
}
func garageApplyLayout(
ctx context.Context,
logger *mlog.Logger,
hostBootstrap bootstrap.Bootstrap,
daemonConfig daemon.Config,
) error {
var (
adminClient = newGarageAdminClient(logger, hostBootstrap, daemonConfig)
thisHost = hostBootstrap.ThisHost()
hostName = thisHost.Name
allocs = daemonConfig.Storage.Allocations
peers = make([]garage.PeerLayout, len(allocs))
)
for i, alloc := range allocs {
id := bootstrapGarageHostForAlloc(thisHost, alloc).ID
zone := hostName
if alloc.Zone != "" {
zone = alloc.Zone
}
peers[i] = garage.PeerLayout{
ID: id,
Capacity: alloc.Capacity * 1_000_000_000,
Zone: zone,
Tags: []string{},
}
}
return adminClient.ApplyLayout(ctx, peers)
}

3
go/cmd/entrypoint/main.go
View File

@ -44,10 +44,11 @@ var (
"STATE_DIRECTORY",
filepath.Join(xdg.StateHome, "isle"),
)
envBinDirPath = filepath.Join(envAppDirPath, "bin")
)
func binPath(name string) string {
return filepath.Join(envAppDirPath, "bin", name)
return filepath.Join(envBinDirPath, name)
}
func main() {

15
go/cmd/entrypoint/dnsmasq_util.go → go/daemon/child_dnsmasq.go
View File

@ -1,10 +1,9 @@
package main
package daemon
import (
"isle/bootstrap"
"isle/daemon"
"isle/dnsmasq"
"fmt"
"isle/bootstrap"
"isle/dnsmasq"
"path/filepath"
"sort"
@ -12,13 +11,13 @@ import (
)
func dnsmasqPmuxProcConfig(
runtimeDirPath, binDirPath string,
hostBootstrap bootstrap.Bootstrap,
daemonConfig daemon.Config,
daemonConfig Config,
) (
pmuxlib.ProcessConfig, error,
) {
confPath := filepath.Join(envRuntimeDirPath, "dnsmasq.conf")
confPath := filepath.Join(runtimeDirPath, "dnsmasq.conf")
hostsSlice := make([]dnsmasq.ConfDataHost, 0, len(hostBootstrap.Hosts))
for _, host := range hostBootstrap.Hosts {
@ -45,7 +44,7 @@ func dnsmasqPmuxProcConfig(
return pmuxlib.ProcessConfig{
Name: "dnsmasq",
Cmd: binPath("dnsmasq"),
Cmd: filepath.Join(binDirPath, "dnsmasq"),
Args: []string{"-d", "-C", confPath},
}, nil
}

206
go/daemon/child_garage.go Normal file
View File

@ -0,0 +1,206 @@
package daemon
import (
"context"
"fmt"
"isle/bootstrap"
"isle/garage"
"isle/garage/garagesrv"
"net"
"path/filepath"
"strconv"
"code.betamike.com/micropelago/pmux/pmuxlib"
"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
)
func garageAdminClientLogger(logger *mlog.Logger) *mlog.Logger {
return logger.WithNamespace("garageAdminClient")
}
// NewGarageAdminClient will return an AdminClient for a local garage instance,
// or it will _panic_ if there is no local instance configured.
func NewGarageAdminClient(
logger *mlog.Logger,
hostBootstrap bootstrap.Bootstrap,
config Config,
) *garage.AdminClient {
thisHost := hostBootstrap.ThisHost()
return garage.NewAdminClient(
garageAdminClientLogger(logger),
net.JoinHostPort(
thisHost.IP().String(),
strconv.Itoa(config.Storage.Allocations[0].AdminPort),
),
hostBootstrap.Garage.AdminToken,
)
}
func (d *daemon) waitForGarage(ctx context.Context) error {
allocs := d.config.Storage.Allocations
// if this host doesn't have any allocations specified then fall back to
// waiting for nebula
if len(allocs) == 0 {
return nil
}
adminClientLogger := garageAdminClientLogger(d.logger)
for _, alloc := range allocs {
adminAddr := net.JoinHostPort(
d.hostBootstrap.ThisHost().IP().String(),
strconv.Itoa(alloc.AdminPort),
)
adminClient := garage.NewAdminClient(
adminClientLogger,
adminAddr,
d.hostBootstrap.Garage.AdminToken,
)
ctx := mctx.Annotate(ctx, "garageAdminAddr", adminAddr)
d.logger.Debug(ctx, "waiting for garage instance to start")
if err := adminClient.Wait(ctx); err != nil {
return fmt.Errorf("waiting for garage instance %q to start up: %w", adminAddr, err)
}
}
return nil
}
// bootstrapGarageHostForAlloc returns the bootstrap.GarageHostInstance which
// corresponds with the given alloc from the daemon config. This will panic if
// no associated instance can be found.
//
// This assumes that coalesceDaemonConfigAndBootstrap has already been called.
func bootstrapGarageHostForAlloc(
host bootstrap.Host,
alloc ConfigStorageAllocation,
) bootstrap.GarageHostInstance {
for _, inst := range host.Garage.Instances {
if inst.RPCPort == alloc.RPCPort {
return inst
}
}
panic(fmt.Sprintf("could not find alloc %+v in the bootstrap data", alloc))
}
func garageWriteChildConfig(
runtimeDirPath string,
hostBootstrap bootstrap.Bootstrap,
alloc ConfigStorageAllocation,
) (
string, error,
) {
thisHost := hostBootstrap.ThisHost()
id := bootstrapGarageHostForAlloc(thisHost, alloc).ID
peer := garage.LocalPeer{
RemotePeer: garage.RemotePeer{
ID: id,
IP: thisHost.IP().String(),
RPCPort: alloc.RPCPort,
S3APIPort: alloc.S3APIPort,
},
AdminPort: alloc.AdminPort,
}
garageTomlPath := filepath.Join(
runtimeDirPath, fmt.Sprintf("garage-%d.toml", alloc.RPCPort),
)
err := garagesrv.WriteGarageTomlFile(garageTomlPath, garagesrv.GarageTomlData{
MetaPath: alloc.MetaPath,
DataPath: alloc.DataPath,
RPCSecret: hostBootstrap.Garage.RPCSecret,
AdminToken: hostBootstrap.Garage.AdminToken,
LocalPeer: peer,
BootstrapPeers: hostBootstrap.GaragePeers(),
})
if err != nil {
return "", fmt.Errorf("creating garage.toml file at %q: %w", garageTomlPath, err)
}
return garageTomlPath, nil
}
func garagePmuxProcConfigs(
runtimeDirPath, binDirPath string,
hostBootstrap bootstrap.Bootstrap,
daemonConfig Config,
) (
[]pmuxlib.ProcessConfig, error,
) {
var pmuxProcConfigs []pmuxlib.ProcessConfig
for _, alloc := range daemonConfig.Storage.Allocations {
childConfigPath, err := garageWriteChildConfig(
runtimeDirPath, hostBootstrap, alloc,
)
if err != nil {
return nil, fmt.Errorf("writing child config file for alloc %+v: %w", alloc, err)
}
pmuxProcConfigs = append(pmuxProcConfigs, pmuxlib.ProcessConfig{
Name: fmt.Sprintf("garage-%d", alloc.RPCPort),
Cmd: filepath.Join(binDirPath, "garage"),
Args: []string{"-c", childConfigPath, "server"},
StartAfterFunc: func(ctx context.Context) error {
return waitForNebula(ctx, hostBootstrap)
},
})
}
return pmuxProcConfigs, nil
}
func garageApplyLayout(
ctx context.Context,
logger *mlog.Logger,
hostBootstrap bootstrap.Bootstrap,
config Config,
) error {
var (
adminClient = NewGarageAdminClient(logger, hostBootstrap, config)
thisHost = hostBootstrap.ThisHost()
hostName = thisHost.Name
allocs = config.Storage.Allocations
peers = make([]garage.PeerLayout, len(allocs))
)
for i, alloc := range allocs {
id := bootstrapGarageHostForAlloc(thisHost, alloc).ID
zone := hostName
if alloc.Zone != "" {
zone = alloc.Zone
}
peers[i] = garage.PeerLayout{
ID: id,
Capacity: alloc.Capacity * 1_000_000_000,
Zone: zone,
Tags: []string{},
}
}
return adminClient.ApplyLayout(ctx, peers)
}

16
go/cmd/entrypoint/nebula_util.go → go/daemon/child_nebula.go
View File

@ -1,10 +1,9 @@
package main
package daemon
import (
"context"
"fmt"
"isle/bootstrap"
"isle/daemon"
"isle/yamlutil"
"net"
"path/filepath"
@ -17,14 +16,16 @@ import (
// this by attempting to create a UDP connection which has the nebula IP set as
// its source. If this succeeds we can assume that at the very least the nebula
// interface has been initialized.
func waitForNebula(ctx context.Context, hostBootstrap bootstrap.Bootstrap) error {
func waitForNebula(
ctx context.Context, hostBootstrap bootstrap.Bootstrap,
) error {
ip := hostBootstrap.ThisHost().IP()
lUdpAddr := &net.UDPAddr{IP: ip, Port: 0}
rUdpAddr := &net.UDPAddr{IP: ip, Port: 45535}
return doOnce(ctx, func(context.Context) error {
return until(ctx, func(context.Context) error {
conn, err := net.DialUDP("udp", lUdpAddr, rUdpAddr)
if err != nil {
return err
@ -35,8 +36,9 @@ func waitForNebula(ctx context.Context, hostBootstrap bootstrap.Bootstrap) error
}
func nebulaPmuxProcConfig(
runtimeDirPath, binDirPath string,
hostBootstrap bootstrap.Bootstrap,
daemonConfig daemon.Config,
daemonConfig Config,
) (
pmuxlib.ProcessConfig, error,
) {
@ -122,7 +124,7 @@ func nebulaPmuxProcConfig(
}
}
nebulaYmlPath := filepath.Join(envRuntimeDirPath, "nebula.yml")
nebulaYmlPath := filepath.Join(runtimeDirPath, "nebula.yml")
if err := yamlutil.WriteYamlFile(config, nebulaYmlPath, 0440); err != nil {
return pmuxlib.ProcessConfig{}, fmt.Errorf("writing nebula.yml to %q: %w", nebulaYmlPath, err)
@ -130,7 +132,7 @@ func nebulaPmuxProcConfig(
return pmuxlib.ProcessConfig{
Name: "nebula",
Cmd: binPath("nebula"),
Cmd: filepath.Join(binDirPath, "nebula"),
Args: []string{"-config", nebulaYmlPath},
}, nil
}

83
go/daemon/config.go
View File

@ -1,6 +1,20 @@
package daemon
import "strconv"
import (
"fmt"
"io"
"isle/yamlutil"
"os"
"path/filepath"
"strconv"
"github.com/imdario/mergo"
"gopkg.in/yaml.v3"
)
func defaultConfigPath(appDirPath string) string {
return filepath.Join(appDirPath, "etc", "daemon.yml")
}
type ConfigTun struct {
Device string `yaml:"device"`
@ -100,3 +114,70 @@ func (c *Config) fillDefaults() {
firewallGarageInbound...,
)
}
// CopyDefaultConfig copies the daemon config file embedded in the AppDir into
// the given io.Writer.
func CopyDefaultConfig(into io.Writer, appDirPath string) error {
defaultConfigPath := defaultConfigPath(appDirPath)
f, err := os.Open(defaultConfigPath)
if err != nil {
return fmt.Errorf("opening daemon config at %q: %w", defaultConfigPath, err)
}
defer f.Close()
if _, err := io.Copy(into, f); err != nil {
return fmt.Errorf("copying daemon config from %q: %w", defaultConfigPath, err)
}
return nil
}
// LoadConfig loads the daemon config from userConfigPath, merges it with
// the default found in the appDirPath, and returns the result.
//
// If userConfigPath is not given then the default is loaded and returned.
func LoadConfig(
appDirPath, userConfigPath string,
) (
Config, error,
) {
defaultConfigPath := defaultConfigPath(appDirPath)
var fullDaemon map[string]interface{}
if err := yamlutil.LoadYamlFile(&fullDaemon, defaultConfigPath); err != nil {
return Config{}, fmt.Errorf("parsing default daemon config file: %w", err)
}
if userConfigPath != "" {
var daemonConfig map[string]interface{}
if err := yamlutil.LoadYamlFile(&daemonConfig, userConfigPath); err != nil {
return Config{}, fmt.Errorf("parsing %q: %w", userConfigPath, err)
}
err := mergo.Merge(&fullDaemon, daemonConfig, mergo.WithOverride)
if err != nil {
return Config{}, fmt.Errorf("merging contents of file %q: %w", userConfigPath, err)
}
}
fullDaemonB, err := yaml.Marshal(fullDaemon)
if err != nil {
return Config{}, fmt.Errorf("yaml marshaling: %w", err)
}
var config Config
if err := yaml.Unmarshal(fullDaemonB, &config); err != nil {
return Config{}, fmt.Errorf("yaml unmarshaling back into Config struct: %w", err)
}
config.fillDefaults()
return config, nil
}

239
go/daemon/daemon.go
View File

@ -1,85 +1,200 @@
// Package daemon contains types and functions related specifically to the
// isle daemon.
// Package daemon implements the isle daemon, which is a long-running service
// managing all isle background tasks and sub-processes for a single cluster.
package daemon
import (
"context"
"fmt"
"io"
"isle/yamlutil"
"isle/bootstrap"
"os"
"path/filepath"
"time"
"github.com/imdario/mergo"
"gopkg.in/yaml.v3"
"code.betamike.com/micropelago/pmux/pmuxlib"
"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
)
func defaultConfigPath(appDirPath string) string {
return filepath.Join(appDirPath, "etc", "daemon.yml")
type daemon struct {
logger *mlog.Logger
config Config
hostBootstrap bootstrap.Bootstrap
opts Opts
pmuxCancelFn context.CancelFunc
pmuxStoppedCh chan struct{}
}
// CopyDefaultConfig copies the daemon config file embedded in the AppDir into
// the given io.Writer.
func CopyDefaultConfig(into io.Writer, appDirPath string) error {
// Daemon presents all functionality required for client frontends to interact
// with isle, typically via the unix socket.
type Daemon interface {
defaultConfigPath := defaultConfigPath(appDirPath)
// Shutdown blocks until all resources held or created by the daemon,
// including child processes it has started, have been cleaned up, or until
// the context is canceled.
//
// If this returns an error then it's possible that child processes are
// still running and are no longer managed.
Shutdown(context.Context) error
}
f, err := os.Open(defaultConfigPath)
if err != nil {
return fmt.Errorf("opening daemon config at %q: %w", defaultConfigPath, err)
// Opts are optional parameters which can be passed in when initializing a new
// Daemon instance. A nil Opts is equivalent to a zero value.
type Opts struct {
// SkipHostBootstrapPush, if set, will cause the Daemon to not push the
// bootstrap to garage upon a successful initialization.
SkipHostBootstrapPush bool
// Stdout and Stderr are what the associated outputs from child processes
// will be directed to.
Stdout, Stderr io.Writer
}
func (o *Opts) withDefaults() *Opts {
if o == nil {
o = new(Opts)
}
defer f.Close()
if o.Stdout == nil {
o.Stdout = os.Stdout
}
if _, err := io.Copy(into, f); err != nil {
return fmt.Errorf("copying daemon config from %q: %w", defaultConfigPath, err)
if o.Stderr == nil {
o.Stderr = os.Stderr
}
return o
}
// New initialized and returns a Daemon. If initialization fails an error is
// returned.
func New(
ctx context.Context,
logger *mlog.Logger,
config Config,
hostBootstrap bootstrap.Bootstrap,
runtimeDirPath, binDirPath string,
opts *Opts,
) (
Daemon, error,
) {
opts = opts.withDefaults()
nebulaPmuxProcConfig, err := nebulaPmuxProcConfig(
runtimeDirPath, binDirPath, hostBootstrap, config,
)
if err != nil {
return nil, fmt.Errorf("generating nebula config: %w", err)
}
dnsmasqPmuxProcConfig, err := dnsmasqPmuxProcConfig(
runtimeDirPath, binDirPath, hostBootstrap, config,
)
if err != nil {
return nil, fmt.Errorf("generating dnsmasq config: %w", err)
}
garagePmuxProcConfigs, err := garagePmuxProcConfigs(
runtimeDirPath, binDirPath, hostBootstrap, config,
)
if err != nil {
return nil, fmt.Errorf("generating garage children configs: %w", err)
}
pmuxConfig := pmuxlib.Config{
Processes: append(
[]pmuxlib.ProcessConfig{
nebulaPmuxProcConfig,
dnsmasqPmuxProcConfig,
},
garagePmuxProcConfigs...,
),
}
pmuxCtx, pmuxCancelFn := context.WithCancel(context.Background())
d := &daemon{
logger: logger,
config: config,
hostBootstrap: hostBootstrap,
opts: *opts,
pmuxCancelFn: pmuxCancelFn,
pmuxStoppedCh: make(chan struct{}),
}
go func() {
defer close(d.pmuxStoppedCh)
pmuxlib.Run(pmuxCtx, d.opts.Stdout, d.opts.Stderr, pmuxConfig)
}()
if initErr := d.postPmuxInit(ctx); initErr != nil {
logger.Warn(ctx, "failed to initialize daemon, shutting down child processes", err)
shutdownCtx, cancel := context.WithTimeout(context.Background(), 1*time.Minute)
defer cancel()
if err := d.Shutdown(shutdownCtx); err != nil {
panic(fmt.Sprintf(
"failed to shut down child processes after initialization"+
" error, there may be zombie children leftover."+
" Original error: %v",
initErr,
))
}
return nil, initErr
}
return d, nil
}
func (d *daemon) postPmuxInit(ctx context.Context) error {
d.logger.Info(ctx, "waiting for nebula VPN to come online")
if err := waitForNebula(ctx, d.hostBootstrap); err != nil {
return fmt.Errorf("waiting for nebula to start: %w", err)
}
d.logger.Info(ctx, "waiting for garage instances to come online")
if err := d.waitForGarage(ctx); err != nil {
return fmt.Errorf("waiting for garage to start: %w", err)
}
if len(d.config.Storage.Allocations) > 0 {
err := until(ctx, func(ctx context.Context) error {
err := garageApplyLayout(ctx, d.logger, d.hostBootstrap, d.config)
if err != nil {
d.logger.Error(ctx, "applying garage layout", err)
return err
}
return nil
})
if err != nil {
return fmt.Errorf("applying garage layout: %w", err)
}
}
if !d.opts.SkipHostBootstrapPush {
if err := until(ctx, func(ctx context.Context) error {
if err := d.hostBootstrap.PutGarageBoostrapHost(ctx); err != nil {
d.logger.Error(ctx, "updating host info in garage", err)
return err
}
return nil
}); err != nil {
return fmt.Errorf("updating host info in garage: %w", err)
}
}
return nil
}
// LoadConfig loads the daemon config from userConfigPath, merges it with
// the default found in the appDirPath, and returns the result.
//
// If userConfigPath is not given then the default is loaded and returned.
func LoadConfig(
appDirPath, userConfigPath string,
) (
Config, error,
) {
defaultConfigPath := defaultConfigPath(appDirPath)
var fullDaemon map[string]interface{}
if err := yamlutil.LoadYamlFile(&fullDaemon, defaultConfigPath); err != nil {
return Config{}, fmt.Errorf("parsing default daemon config file: %w", err)
func (d *daemon) Shutdown(ctx context.Context) error {
d.pmuxCancelFn()
select {
case <-ctx.Done():
return ctx.Err()
case <-d.pmuxStoppedCh:
return nil
}
if userConfigPath != "" {
var daemonConfig map[string]interface{}
if err := yamlutil.LoadYamlFile(&daemonConfig, userConfigPath); err != nil {
return Config{}, fmt.Errorf("parsing %q: %w", userConfigPath, err)
}
err := mergo.Merge(&fullDaemon, daemonConfig, mergo.WithOverride)
if err != nil {
return Config{}, fmt.Errorf("merging contents of file %q: %w", userConfigPath, err)
}
}
fullDaemonB, err := yaml.Marshal(fullDaemon)
if err != nil {
return Config{}, fmt.Errorf("yaml marshaling: %w", err)
}
var config Config
if err := yaml.Unmarshal(fullDaemonB, &config); err != nil {
return Config{}, fmt.Errorf("yaml unmarshaling back into Config struct: %w", err)
}
config.fillDefaults()
return config, nil
}

18
go/daemon/jigs.go Normal file
View File

@ -0,0 +1,18 @@
package daemon
import (
"context"
"time"
)
func until(ctx context.Context, fn func(context.Context) error) error {
for {
if err := fn(ctx); err == nil {
return nil
} else if ctxErr := ctx.Err(); ctxErr != nil {
return ctxErr
}
time.Sleep(1 * time.Second)
}
}