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serve.go
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serve.go
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package core
import (
"context"
"errors"
"fmt"
"io"
"os"
"reflect"
"sort"
"strings"
"sync"
"time"
zero "github.com/anz-bank/pkg/logging"
pkg "github.com/anz-bank/pkg/log"
"github.com/anz-bank/sysl-go/log"
"github.com/anz-bank/sysl-go/config"
"github.com/anz-bank/sysl-go/health"
"github.com/spf13/afero"
pkgHealth "github.com/anz-bank/pkg/health"
"github.com/prometheus/client_golang/prometheus"
)
type serveContextKey int
const (
serveYAMLConfigFileKey serveContextKey = iota
defaultContextTimeout = 30 * time.Second
)
type ErrDisplayHelp int
func (e ErrDisplayHelp) Error() string {
return "Display help"
}
// WithConfigFile adds configuration data into the context. This will be
// used as the source of application configuration data, instead of the
// default behaviour of reading configuration from the config file path
// specified by command line arguments. Data must be in YAML format.
func WithConfigFile(ctx context.Context, yamlConfigData []byte) context.Context {
return context.WithValue(ctx, serveYAMLConfigFileKey, yamlConfigData)
}
// Serve is deprecated and will be removed once downstream applications cease
// depending upon it. Generated code will no longer call this function.
// This is a shim for compatibility with code generated by sysl-go versions v0.122.0 & earlier.
func Serve(
ctx context.Context,
downstreamConfig, createService, serviceInterface interface{},
newManagers func(ctx context.Context, serviceIntf interface{}, hooks *Hooks) (Manager, *GrpcServerManager, error),
) error {
srv, err := NewServer(ctx, downstreamConfig, createService, serviceInterface, newManagers)
if err != nil {
return err
}
return srv.Start()
}
// NewServer returns an auto-generated service.
//nolint:funlen
func NewServer(
ctx context.Context,
downstreamConfig, createService, serviceInterface interface{},
newManagers func(ctx context.Context, serviceIntf interface{}, hooks *Hooks) (Manager, *GrpcServerManager, error),
) (StoppableServer, error) {
// Cache the external logger (i.e. the logger set within the context before bootstrapping).
var externalLogger log.Logger
ctx, externalLogger = getExternalLogger(ctx)
// Put the bootstrap logger in the context if no external logger is provided. The bootstrap
// logger is designed to provide a fail-safe logger within the context during bootstrapping only.
// In an ideal setup the bootstrap logger will never be called, however in some edge cases it
// may be desirable to capture logs before the Hooks.Logger has a chance to be called. In this
// instance the recommended approach is to call log.PutLogger on the context before calling this
// method. The outcome of this approach is that the Hooks.Logger method is ignored.
// The zero pkg logger used below is a deliberate choice because the default logger (the pkg
// logger) merges fields even when a new set of fields are set against the context therefore
// this bootstrap message would persist to all log messages in the default case.
if externalLogger == nil {
ctx = log.PutLogger(ctx, log.NewZeroPkgLogger(zero.New(os.Stdout)).WithStr("bootstrap",
"logging called before bootstrapping complete, to centralise these logs call "+
"log.PutLogger before core.NewServer"))
}
// Load the custom configuration.
MustTypeCheckCreateService(createService, serviceInterface)
customConfig := NewZeroCustomConfig(reflect.TypeOf(downstreamConfig), GetAppConfigType(createService))
customConfig, err := LoadCustomConfig(ctx, customConfig)
if err != nil {
return nil, err
}
if customConfig == nil {
return nil, fmt.Errorf("configuration is empty")
}
customConfigValue := reflect.ValueOf(customConfig).Elem()
library := customConfigValue.FieldByName("Library").Interface().(config.LibraryConfig)
admin := customConfigValue.FieldByName("Admin").Interface().(*config.AdminConfig)
genCodeValue := customConfigValue.FieldByName("GenCode")
development := customConfigValue.FieldByName("Development").Interface().(*config.DevelopmentConfig)
appConfig := customConfigValue.FieldByName("App")
upstream := genCodeValue.FieldByName("Upstream").Interface().(config.UpstreamConfig)
downstream := genCodeValue.FieldByName("Downstream").Interface()
defaultConfig := &config.DefaultConfig{
Library: library,
Admin: admin,
Development: development,
GenCode: config.GenCodeConfig{
Upstream: upstream,
Downstream: downstream,
},
}
// Put the default configuration in the context.
ctx = config.PutDefaultConfig(ctx, defaultConfig)
// Create the service by calling the create-service callback.
createServiceResult := reflect.ValueOf(createService).Call(
[]reflect.Value{reflect.ValueOf(ctx), appConfig},
)
if err := createServiceResult[2].Interface(); err != nil {
return nil, err.(error)
}
serviceIntf := createServiceResult[0].Interface()
hooksIntf := createServiceResult[1].Interface()
// Validate the hooks returned from service creation.
hooks := hooksIntf.(*Hooks)
if hooks != nil && hooks.ValidateConfig != nil {
err = hooks.ValidateConfig(ctx, defaultConfig)
if err != nil {
return nil, err
}
}
// Set the logger against the context if no external logger is provided. The value will be
// either the value returned from the Hooks (if provided) or the default logger.
if externalLogger == nil {
var logger log.Logger
if hooks != nil && hooks.Logger != nil {
logger = hooks.Logger()
}
if logger == nil {
logger = log.NewDefaultLogger()
}
ctx = log.PutLogger(ctx, logger)
}
// Set the level against the logger. The level will be either the value found within the
// configuration or the default value (info).
var level log.Level
if defaultConfig.Library.Log.Level != 0 {
level = defaultConfig.Library.Log.Level
} else {
level = log.InfoLevel
}
ctx = log.WithLevel(ctx, level)
// Collect prometheus metrics if the admin server is enabled.
var promRegistry *prometheus.Registry
if admin != nil {
promRegistry = prometheus.NewRegistry()
}
server := &autogenServer{
name: "nameless-autogenerated-app", // TODO source the application name from somewhere
prometheusRegistry: promRegistry,
}
manager, grpcManager, err := newManagers(ctx, serviceIntf, hooks)
if err != nil {
return nil, err
}
server.restManager = manager
server.grpcServerManager = grpcManager
server.ctx = ctx
return server, nil
}
// LoadCustomConfig populates the given zero customConfig value with configuration data.
func LoadCustomConfig(ctx context.Context, customConfig interface{}) (interface{}, error) {
// Figure out where we can read application configuration data from.
var fs afero.Fs
var configPath string
if v := ctx.Value(serveYAMLConfigFileKey); v != nil {
applicationConfig := v.([]byte)
fs = afero.NewMemMapFs()
configPath = "config.yaml"
err := afero.Afero{Fs: fs}.WriteFile(configPath, applicationConfig, 0777)
if err != nil {
return nil, err
}
} else {
fs = afero.NewOsFs()
if len(os.Args) != 2 {
return nil, fmt.Errorf("Wrong number of arguments (usage: %s (config | -h | --help))", os.Args[0])
}
if os.Args[1] == "--help" || os.Args[1] == "-h" {
fmt.Printf("Usage: %s config\n\n", os.Args[0])
describeCustomConfig(os.Stdout, customConfig)
fmt.Print("\n\n")
return nil, ErrDisplayHelp(2)
}
configPath = os.Args[1]
}
// Read application configuration data.
b := config.NewConfigReaderBuilder().WithFs(fs).WithConfigFile(configPath)
envPrefixConfigKey := "envPrefix"
// Enable strict mode to raise an error if there are config keys read from
// input that have no corresponding place in the customConfig structure
// that we're going to decode into -- with the exception of the special
// optional envPrefix key -- that doesn't end up getting decoded into the
// structure but, if it is present, we do read it below to customise how
// environment variables are loaded.
b = b.WithStrictMode(true, envPrefixConfigKey)
// Use the environment variable prefix from the config file if provided
env, err := b.Build().GetString(envPrefixConfigKey)
// Disable the feature if none is provided
if len(env) > 0 && err == nil {
b = b.AttachEnvPrefix(env)
}
err = b.Build().Unmarshal(customConfig)
if err != nil {
return nil, err
}
return customConfig, err
}
// NewZeroCustomConfig uses reflection to create a new type derived from DefaultConfig,
// but with new GenCode.Downstream and App fields holding the same types as
// downstreamConfig and appConfig. It returns a pointer to a zero value of that
// new type.
func NewZeroCustomConfig(downstreamConfigType, appConfigType reflect.Type) interface{} {
defaultConfigType := reflect.TypeOf(config.DefaultConfig{})
libraryField, has := defaultConfigType.FieldByName("Library")
if !has {
panic("config.DefaultType missing Library field")
}
adminField, _ := defaultConfigType.FieldByName("Admin")
if !has {
panic("config.DefaultType missing Admin field")
}
developmentField, has := defaultConfigType.FieldByName("Development")
if !has {
panic("config.DefaultType missing Development field")
}
genCodeType := reflect.TypeOf(config.GenCodeConfig{})
upstreamField, has := genCodeType.FieldByName("Upstream")
if !has {
panic("config.DefaultType missing Upstream field")
}
return reflect.New(reflect.StructOf([]reflect.StructField{
libraryField,
adminField,
{Name: "GenCode", Type: reflect.StructOf([]reflect.StructField{
upstreamField,
{Name: "Downstream", Type: downstreamConfigType, Tag: `mapstructure:"downstream"`},
}), Tag: `mapstructure:"genCode"`},
developmentField,
{Name: "App", Type: appConfigType, Tag: `mapstructure:"app"`},
})).Interface()
}
// MustTypeCheckCreateService checks that the given createService has an acceptable type, and panics otherwise.
func MustTypeCheckCreateService(createService, serviceInterface interface{}) {
cs := reflect.TypeOf(createService)
if cs.NumIn() != 2 {
panic("createService: wrong number of in params")
}
if cs.NumOut() != 3 {
panic("createService: wrong number of out params")
}
var ctx context.Context
if reflect.TypeOf(&ctx).Elem() != cs.In(0) {
panic(fmt.Errorf("createService: first in param must be of type context.Context, not %v", cs.In(0)))
}
serviceInterfaceType := reflect.TypeOf(serviceInterface)
if serviceInterfaceType != cs.Out(0) {
panic(fmt.Errorf("createService: second out param must be of type %v, not %v", serviceInterfaceType, cs.Out(0)))
}
var hooks Hooks
if reflect.TypeOf(&hooks) != cs.Out(1) {
panic(fmt.Errorf("createService: second out param must be of type *Hooks, not %v", cs.Out(1)))
}
var err error
if reflect.TypeOf(&err).Elem() != cs.Out(2) {
panic(fmt.Errorf("createService: third out param must be of type error, not %v", cs.Out(1)))
}
}
// GetAppConfigType extracts the app's config type from createService.
// Precondition: MustTypeCheckCreateService(createService, serviceInterface) succeeded.
func GetAppConfigType(createService interface{}) reflect.Type {
cs := reflect.TypeOf(createService)
return cs.In(1)
}
func yamlEgComment(example, format string, args ...interface{}) string {
return fmt.Sprintf("\033[1;31m%s \033[0;32m# "+format+"\033[0m", append([]interface{}{example}, args...)...)
}
func describeCustomConfig(w io.Writer, customConfig interface{}) {
commonTypes := map[reflect.Type]string{
reflect.TypeOf(config.CommonServerConfig{}): "",
reflect.TypeOf(config.CommonDownstreamData{}): "",
reflect.TypeOf(config.TLSConfig{}): "",
reflect.TypeOf(config.SensitiveString{}): yamlEgComment(`"*****"`, "sensitive string"),
}
fmt.Fprint(w, "\033[1mConfiguration file YAML schema\033[0m")
commonTypeNames := make([]string, 0, len(commonTypes))
commonTypesByName := make(map[string]reflect.Type, len(commonTypes))
for ct := range commonTypes {
name := fmt.Sprintf("%s.%s", ct.PkgPath(), ct.Name())
commonTypeNames = append(commonTypeNames, name)
commonTypesByName[name] = ct
}
sort.Strings(commonTypeNames)
for _, name := range commonTypeNames {
ct := commonTypesByName[name]
if commonTypes[ct] == "" {
delete(commonTypes, ct)
fmt.Fprintf(w, "\n\n\033[1;32m%q.%s:\033[0m", ct.PkgPath(), ct.Name())
describeYAMLForType(w, ct, commonTypes, 4)
commonTypes[ct] = ""
}
}
fmt.Fprintf(w, "\n\n\033[1mApplication Configuration\033[0m")
describeYAMLForType(w, reflect.TypeOf(customConfig), commonTypes, 0)
}
//nolint:funlen
func describeYAMLForType(w io.Writer, t reflect.Type, commonTypes map[reflect.Type]string, indent int) {
outf := func(format string, args ...interface{}) {
parts := strings.SplitAfterN(format, "\n", 2)
fmt.Fprintf(w, strings.Join(parts, strings.Repeat(" ", indent)), args...)
}
if alias, has := commonTypes[t]; has {
if alias == "" {
outf(" " + yamlEgComment(`{}`, "%q.%s", t.PkgPath(), t.Name()))
} else {
outf(" %s", alias)
}
return
}
switch t.Kind() {
case reflect.Bool:
outf(" \033[1mfalse\033[0m")
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
outf(" \033[1m0\033[0m")
case reflect.Float32, reflect.Float64:
outf(" \033[1m0.0\033[0m")
case reflect.Array, reflect.Slice:
outf("\n-")
describeYAMLForType(w, t.Elem(), commonTypes, indent+4)
case reflect.Interface:
outf(" " + yamlEgComment("{}", "any value"))
case reflect.Map:
outf("\n key: ")
describeYAMLForType(w, t.Elem(), commonTypes, indent+4)
case reflect.Ptr:
describeYAMLForType(w, t.Elem(), commonTypes, indent)
case reflect.String:
outf(" \033[1m\"\"\033[0m")
case reflect.Struct:
n := t.NumField()
for i := 0; i < n; i++ {
f := t.Field(i)
var name string
yamlTag := f.Tag.Get("yaml")
yamlParts := strings.Split(yamlTag, ",")
mapTag := f.Tag.Get("mapstructure")
mapParts := strings.Split(mapTag, ",")
switch {
case len(mapTag) > 0:
name = mapParts[0]
case len(yamlTag) > 0:
name = yamlParts[0]
case f.Type.Kind() == reflect.Func:
name = ""
default:
name = f.Name
}
if len(name) > 0 {
outf("\n%s:", name)
}
describeYAMLForType(w, f.Type, commonTypes, indent+4)
}
case reflect.Func:
break
default:
panic(fmt.Errorf("describeYAMLForType: Unhandled type: %v", t))
}
}
type autogenServer struct {
ctx context.Context
name string
restManager Manager
grpcServerManager *GrpcServerManager
prometheusRegistry *prometheus.Registry
servers []StoppableServer
}
//nolint:funlen,gocognit
func (s *autogenServer) Start() error {
// precondition: ctx must have been threaded through InitialiseLogging and hence contain a logger
ctx := s.ctx
// prepare the middleware
var contextTimeout time.Duration
if s.restManager != nil && s.restManager.PublicServerConfig() != nil {
contextTimeout = s.restManager.PublicServerConfig().ContextTimeout
}
if contextTimeout == 0 {
contextTimeout = defaultContextTimeout
}
mWare := prepareMiddleware(s.name, s.prometheusRegistry, contextTimeout)
// load health server
var healthServer *health.Server = nil
var err error
if s.restManager != nil && s.restManager.LibraryConfig() != nil && s.restManager.LibraryConfig().Health {
healthServer, err = health.NewServer()
if err != nil {
return err
}
s.grpcServerManager.EnabledGrpcHandlers = append(s.grpcServerManager.EnabledGrpcHandlers, healthServer)
}
var restIsRunning, grpcIsRunning bool
servers := make([]StoppableServer, 0)
// Make the listener function for the REST Admin server
if s.restManager != nil && s.restManager.AdminServerConfig() != nil {
log.Info(ctx, "found AdminServerConfig for REST")
var healthHTTPServer *pkgHealth.HTTPServer
if healthServer != nil {
healthHTTPServer = healthServer.HTTP
}
serverAdmin, err := configureAdminServerListener(ctx, s.restManager, s.prometheusRegistry, healthHTTPServer, mWare.admin)
if err != nil {
return err
}
servers = append(servers, serverAdmin)
} else {
log.Info(ctx, "no AdminServerConfig for REST was found")
}
// Make the listener function for the REST Public server
if s.restManager != nil && s.restManager.PublicServerConfig() != nil {
log.Info(ctx, "found PublicServerConfig for REST")
serverPublic, err := configurePublicServerListener(ctx, s.restManager, mWare.public)
if err != nil {
return err
}
servers = append(servers, serverPublic)
restIsRunning = true
} else {
log.Info(ctx, "no PublicServerConfig for REST was found")
}
// Make the listener function for the gRPC Public server.
if s.grpcServerManager != nil && s.grpcServerManager.GrpcPublicServerConfig != nil && len(s.grpcServerManager.EnabledGrpcHandlers) > 0 {
log.Info(ctx, "found GrpcPublicServerConfig for gRPC")
serverPublicGrpc := configurePublicGrpcServerListener(ctx, *s.grpcServerManager)
servers = append(servers, serverPublicGrpc)
grpcIsRunning = true
} else {
log.Info(ctx, "no GrpcPublicServerConfig for gRPC was found")
}
// Refuse to start and panic if neither of the public servers are enabled.
if !restIsRunning && !grpcIsRunning {
err := errors.New("REST and gRPC servers cannot both be nil")
log.Error(ctx, err, "error starting server")
panic(err)
}
s.servers = servers
// Start all configured servers and block until the first one terminates.
errChan := make(chan error, 1)
for i := range servers {
i := i // force capture
server := s.servers[i] // force capture
go func() {
log.Infof(ctx, "starting sub-server %d of %d (%s)", i+1, len(servers), server.GetName())
errChan <- server.Start()
}()
}
if healthServer != nil {
// Set health server to be ready
healthServer.SetReady(true)
}
return <-errChan
}
// FIXME replace MultiError with some existing type that does this job better.
type MultiError struct {
Msg string
Errors []error
}
func (e MultiError) Error() string {
msgs := make([]string, len(e.Errors))
for i, e := range e.Errors {
msgs[i] = e.Error()
}
return fmt.Sprintf("%s; sub-error(s): %s", e.Msg, strings.Join(msgs, "; "))
}
func (s *autogenServer) Stop() error {
errQueue := make(chan error, len(s.servers))
var wg sync.WaitGroup
for i := range s.servers {
i := i // force capture
server := s.servers[i] // force capture
wg.Add(1)
go func() {
defer wg.Done()
log.Infof(s.ctx, "stopping sub-server %d of %d (%s)...", i+1, len(s.servers), server.GetName())
err := server.Stop()
log.Infof(s.ctx, "stopped sub-server %d of %d (%s)", i+1, len(s.servers), server.GetName())
if err != nil {
errQueue <- err
}
}()
}
wg.Wait()
close(errQueue)
errors := make([]error, 0)
for err := range errQueue {
errors = append(errors, err)
}
if len(errors) > 0 {
return MultiError{Msg: "error during stop", Errors: errors}
}
return nil
}
func (s *autogenServer) GracefulStop() error {
errQueue := make(chan error, len(s.servers))
var wg sync.WaitGroup
for i := range s.servers {
i := i // force capture
server := s.servers[i] // force capture
wg.Add(1)
go func() {
defer wg.Done()
log.Infof(s.ctx, "graceful-stopping sub-server %d of %d (%s)...", i+1, len(s.servers), server.GetName())
err := server.GracefulStop()
log.Infof(s.ctx, "graceful-stopped sub-server %d of %d (%s)", i+1, len(s.servers), server.GetName())
if err != nil {
errQueue <- err
}
}()
}
wg.Wait()
close(errQueue)
errors := make([]error, 0)
for err := range errQueue {
errors = append(errors, err)
}
if len(errors) > 0 {
return MultiError{Msg: "error during graceful stop", Errors: errors}
}
return nil
}
func (s autogenServer) GetName() string {
return s.name
}
// getExternalLogger returns the log.Logger instance that has been set within the context before
// Sysl-go is initialised. This method is designed to support a variety of use-cases:
//
// 1. The recommended approach to customise the logging implementation is to provide a logger
// instance through the Hooks.Logger method. The logger is set against the context and made
// available throughout the application through various methods (e.g. log.Info). In this
// configuration (i.e. no external logger has been set), this method returns nil.
//
// 2. Due to the way Sysl-go initialises its services, in some edge cases it is desirable to capture
// logs before the Hooks.Logger has a chance to be called. In this instance the recommendation is to
// call log.PutLogger on the context before Sysl-go bootstrapping. The outcome of this approach is
// that the Hooks.Logger method is ignored. In this configuration (i.e. the external logger directly
// set), this method returns the logger.
//
// 3. In order to support legacy Sysl-go applications that directly set a Logrus logger against the
// context before bootstrapping, this method will wrap and return an appropriate log.Logger instance.
//
// 4. In order to support legacy Sysl-go applications that directly set a pkg logger against the
// context before bootstrapping, this method will wrap and return an appropriate log.Logger instance.
//
// 5. For other configurations this method will return nil.
func getExternalLogger(ctx context.Context) (context.Context, log.Logger) {
logger := log.GetLogger(ctx)
if logger != nil {
return ctx, logger
}
logrus := log.GetLogrusLoggerFromContext(ctx) // nolint:staticcheck
if logrus != nil {
lgr := log.NewLogrusLogger(logrus)
lgr.Debug("legacy logrus logger configuration detected, use Hooks.Logger instead")
return log.PutLogger(ctx, lgr), lgr
}
fields := pkg.FieldsFrom(ctx)
empty := pkg.Fields{}
if fields != empty {
lgr := log.NewPkgLogger(fields)
lgr.Debug("legacy pkg logger configuration detected, use Hooks.Logger instead")
return log.PutLogger(ctx, lgr), lgr
}
return ctx, nil
}