596 lines
19 KiB
Go
596 lines
19 KiB
Go
package main
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import (
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"errors"
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"fmt"
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library "git.ailur.dev/ailur/fg-library/v2"
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"io"
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"log"
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"os"
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"plugin"
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"sort"
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"strings"
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"sync"
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"time"
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"database/sql"
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"encoding/json"
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"log/slog"
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"net/http"
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"path/filepath"
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"github.com/go-chi/chi/v5"
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"github.com/go-chi/hostrouter"
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"github.com/go-playground/validator/v10"
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"github.com/google/uuid"
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_ "github.com/lib/pq"
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_ "modernc.org/sqlite"
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)
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type Config struct {
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Global struct {
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IP string `json:"ip" validate:"required,ip_addr"`
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Port string `json:"port" validate:"required"`
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ServiceDirectory string `json:"serviceDirectory" validate:"required"`
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ResourceDirectory string `json:"resourceDirectory" validate:"required"`
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} `json:"global" validate:"required"`
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Logging struct {
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Enabled bool `json:"enabled"`
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File string `json:"file" validate:"required_if=Enabled true"`
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} `json:"logging"`
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Database struct {
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DatabaseType string `json:"databaseType" validate:"required,oneof=sqlite postgres"`
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ConnectionString string `json:"connectionString" validate:"required_if=DatabaseType postgres"`
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DatabasePath string `json:"databasePath" validate:"required_if=DatabaseType sqlite"`
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} `json:"database" validate:"required"`
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Services map[string]interface{} `json:"services"`
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}
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type Service struct {
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ServiceID uuid.UUID
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ServiceMetadata library.Service
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Inbox chan library.InterServiceMessage
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}
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var (
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logger = func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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next.ServeHTTP(w, r)
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slog.Info(r.Method + " " + r.URL.Path)
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})
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}
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validate *validator.Validate
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services = make(map[uuid.UUID]Service)
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lock sync.RWMutex
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hostRouter = hostrouter.New()
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)
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func processInterServiceMessage(channel chan library.InterServiceMessage, config Config) {
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for {
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message := <-channel
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if message.ForServiceID == uuid.MustParse("00000000-0000-0000-0000-000000000000") {
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// Broadcast message
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for _, service := range services {
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service.Inbox <- message
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}
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} else if message.ForServiceID == uuid.MustParse("00000000-0000-0000-0000-000000000001") {
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// Service initialization service
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switch message.MessageType {
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case 0:
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// This has been deprecated, ignore it
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// Send "true" back
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services[message.ServiceID].Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 0,
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SentAt: time.Now(),
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Message: true,
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}
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case 1:
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// Service database initialization message
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// Check if the service has the necessary permissions
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if services[message.ServiceID].ServiceMetadata.Permissions.Database {
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// Check if we are using sqlite or postgres
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if config.Database.DatabaseType == "sqlite" {
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// Open the database and return the connection
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pluginConn, err := sql.Open("sqlite", filepath.Join(config.Database.DatabasePath, message.ServiceID.String()+".db"))
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if err != nil {
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// Report an error
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services[message.ServiceID].Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: err,
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}
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} else {
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// Report a successful activation
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services[message.ServiceID].Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 2,
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SentAt: time.Now(),
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Message: library.Database{
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DB: pluginConn,
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DBType: library.Sqlite,
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},
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}
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}
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} else if config.Database.DatabaseType == "postgres" {
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// Connect to the database
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conn, err := sql.Open("postgres", config.Database.ConnectionString)
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if err != nil {
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// Report an error
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services[message.ServiceID].Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: err,
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}
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} else {
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// Try to create the schema
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_, err = conn.Exec("CREATE SCHEMA IF NOT EXISTS \"" + message.ServiceID.String() + "\"")
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if err != nil {
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// Report an error
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services[message.ServiceID].Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: err,
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}
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} else {
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// Create a new connection to the database
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var connectionString string
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if strings.Contains(config.Database.ConnectionString, "?") {
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connectionString = config.Database.ConnectionString + "&search_path=\"" + message.ServiceID.String() + "\""
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} else {
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connectionString = config.Database.ConnectionString + "?search_path=\"" + message.ServiceID.String() + "\""
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}
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pluginConn, err := sql.Open("postgres", connectionString)
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if err != nil {
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// Report an error
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services[message.ServiceID].Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: err,
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}
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} else {
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// Test the connection
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err = pluginConn.Ping()
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if err != nil {
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// Report an error
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services[message.ServiceID].Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: err,
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}
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} else {
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// Report a successful activation
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services[message.ServiceID].Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 2,
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SentAt: time.Now(),
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Message: library.Database{
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DB: pluginConn,
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DBType: library.Postgres,
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},
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}
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}
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}
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}
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}
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}
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} else {
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// Report an error
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services[message.ServiceID].Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: errors.New("database access not permitted"),
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}
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}
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}
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} else if message.ForServiceID == uuid.MustParse("00000000-0000-0000-0000-000000000002") {
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// Logger service
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service, ok := services[message.ServiceID]
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if ok {
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switch message.MessageType {
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case 0:
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// Log message
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slog.Info(service.ServiceMetadata.Name + " says: " + message.Message.(string))
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case 1:
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// Warn message
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slog.Warn(service.ServiceMetadata.Name + " warns: " + message.Message.(string))
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case 2:
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// Error message
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slog.Error(service.ServiceMetadata.Name + " complains: " + message.Message.(string))
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case 3:
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// Fatal message
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slog.Error(service.ServiceMetadata.Name + "'s dying wish: " + message.Message.(string))
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os.Exit(1)
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}
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}
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} else if message.ForServiceID == uuid.MustParse("00000000-0000-0000-0000-000000000003") {
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// We need to check if the service is allowed to access the Blob Storage service
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serviceMetadata, ok := services[message.ServiceID]
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if ok && serviceMetadata.ServiceMetadata.Permissions.BlobStorage {
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// Send message to Blob Storage service
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service, ok := services[uuid.MustParse("00000000-0000-0000-0000-000000000003")]
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if ok {
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service.Inbox <- message
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} else if !ok {
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// Send error message
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service, ok := services[message.ServiceID]
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if ok {
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service.Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: errors.New("blob storage service not found"),
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}
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} else {
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// This should never happen
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slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.")
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os.Exit(1)
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}
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} else {
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// Send error message
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service, ok := services[message.ServiceID]
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if ok {
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service.Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: errors.New("blob storage is not yet available"),
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}
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} else {
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// This should never happen
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slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.")
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os.Exit(1)
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}
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}
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} else {
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// Send error message
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service, ok := services[message.ServiceID]
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if ok {
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service.Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: errors.New("blob storage is not permitted"),
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}
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} else {
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// This should never happen
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slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.")
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os.Exit(1)
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}
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}
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} else if message.ForServiceID == uuid.MustParse("00000000-0000-0000-0000-000000000004") {
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// We need to check if the service is allowed to access the Authentication service
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serviceMetadata, ok := services[message.ServiceID]
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if ok && serviceMetadata.ServiceMetadata.Permissions.Authenticate {
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// Send message to Authentication service
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service, ok := services[uuid.MustParse("00000000-0000-0000-0000-000000000004")]
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if ok {
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service.Inbox <- message
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} else if !ok {
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// Send error message
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service, ok := services[message.ServiceID]
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if ok {
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service.Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: errors.New("authentication service not found"),
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}
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} else {
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// This should never happen
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slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.")
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os.Exit(1)
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}
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} else {
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// Send error message
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service, ok := services[message.ServiceID]
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if ok {
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service.Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: errors.New("authentication service not yet available"),
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}
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} else {
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// This should never happen
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slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.")
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os.Exit(1)
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}
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}
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} else {
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// Send error message
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service, ok := services[message.ServiceID]
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if ok {
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service.Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: errors.New("authentication not permitted"),
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}
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} else {
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// This should never happen
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slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.")
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os.Exit(1)
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}
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}
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} else {
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serviceMetadata, ok := services[message.ServiceID]
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if ok && serviceMetadata.ServiceMetadata.Permissions.InterServiceCommunication {
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// Send message to specific service
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service, ok := services[message.ForServiceID]
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if !ok {
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// Send error message
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service, ok := services[message.ServiceID]
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if ok {
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service.Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: errors.New("requested service not found"),
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}
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} else {
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// This should never happen
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slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.")
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os.Exit(1)
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}
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}
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service.Inbox <- message
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} else {
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// Send error message
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service, ok := services[message.ServiceID]
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if ok {
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service.Inbox <- library.InterServiceMessage{
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"),
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ForServiceID: message.ServiceID,
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MessageType: 1,
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SentAt: time.Now(),
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Message: errors.New("inter-service communication not permitted"),
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}
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} else {
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// This should never happen
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slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.")
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os.Exit(1)
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}
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}
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}
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}
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}
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func parseConfig(path string) Config {
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// Register the custom validators
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validate = validator.New()
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// Register the custom isDirectory validator
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err := validate.RegisterValidation("isDirectory", func(fl validator.FieldLevel) bool {
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// Check if it exists
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fileInfo, err := os.Stat(fl.Field().String())
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if err != nil {
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return false
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}
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// Check if it is a directory
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return fileInfo.IsDir()
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})
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if err != nil {
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slog.Error("Error registering custom validator: ", err)
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os.Exit(1)
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}
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// Parse the configuration file
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configFile, err := os.ReadFile(path)
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if err != nil {
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slog.Error("Error reading configuration file: ", err)
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os.Exit(1)
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}
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// Parse the configuration file
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var config Config
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err = json.Unmarshal(configFile, &config)
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if err != nil {
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slog.Error("Error parsing configuration file: ", err)
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os.Exit(1)
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}
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// Validate the configuration
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err = validate.Struct(config)
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if err != nil {
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slog.Error("Invalid configuration: ", err)
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os.Exit(1)
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}
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// Check if we are logging to a file
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if config.Logging != (Config{}.Logging) && config.Logging.Enabled {
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// Check if the log file is set
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logFilePath := config.Logging.File
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// Set the log file
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logFile, err := os.OpenFile(logFilePath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
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if err != nil {
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slog.Error("Error opening log file: ", err)
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os.Exit(1)
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}
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log.SetOutput(io.MultiWriter(os.Stdout, logFile))
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}
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return config
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}
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func main() {
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// Parse the configuration file
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var config Config
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if len(os.Args) < 2 {
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info, err := os.Stat("config.json")
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if err != nil {
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if errors.Is(err, os.ErrNotExist) {
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slog.Error("No configuration file provided")
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os.Exit(1)
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} else {
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slog.Error("Error reading configuration file: ", err)
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os.Exit(1)
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}
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}
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if info.IsDir() {
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slog.Error("No configuration file provided")
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os.Exit(1)
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}
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config = parseConfig("config.json")
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} else {
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config = parseConfig(os.Args[1])
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}
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// Create the router
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router := chi.NewRouter()
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router.Use(logger)
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var globalOutbox = make(chan library.InterServiceMessage)
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// Initialize the service discovery, health-check, and logging services
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// Since these are core services, always allocate them the service IDs 0, 1, and 2
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// These are not dynamically loaded, as they are integral to the system functioning
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go processInterServiceMessage(globalOutbox, config)
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// Initialize all the services
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plugins := make(map[time.Time]string)
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err := filepath.Walk(config.Global.ServiceDirectory, func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if info.IsDir() || filepath.Ext(path) != ".fgs" {
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return nil
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}
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// Add the plugin to the list of plugins
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if info.Name() == "storage.fgs" {
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plugins[time.Unix(0, 0)] = path
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return nil
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} else if info.Name() == "auth.fgs" {
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plugins[time.Unix(0, 1)] = path
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return nil
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}
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plugins[info.ModTime()] = path
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return nil
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})
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if err != nil {
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slog.Error("Error walking the services directory: ", err)
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os.Exit(1)
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}
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// Sort the plugins by modification time, newest last
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var keys []time.Time
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for k := range plugins {
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keys = append(keys, k)
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}
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sort.Slice(keys, func(i, j int) bool {
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return keys[i].Before(keys[j])
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})
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for _, k := range keys {
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// Get the plugin path
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pluginPath := plugins[k]
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|
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// Load the plugin
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servicePlugin, err := plugin.Open(pluginPath)
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if err != nil {
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slog.Error("Could not load service: ", err)
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os.Exit(1)
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}
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// Load the service information
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serviceInformationSymbol, err := servicePlugin.Lookup("ServiceInformation")
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if err != nil {
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slog.Error("Service lacks necessary information: ", err)
|
|
os.Exit(1)
|
|
}
|
|
|
|
serviceInformation := *serviceInformationSymbol.(*library.Service)
|
|
|
|
// Load the main function
|
|
main, err := servicePlugin.Lookup("Main")
|
|
if err != nil {
|
|
slog.Error("Service lacks necessary main function: ", err)
|
|
os.Exit(1)
|
|
}
|
|
|
|
// Initialize the service
|
|
var inbox = make(chan library.InterServiceMessage)
|
|
lock.Lock()
|
|
services[serviceInformation.ServiceID] = Service{
|
|
ServiceID: serviceInformation.ServiceID,
|
|
Inbox: inbox,
|
|
ServiceMetadata: serviceInformation,
|
|
}
|
|
lock.Unlock()
|
|
|
|
slog.Info("Activating service " + serviceInformation.Name + " with ID " + serviceInformation.ServiceID.String())
|
|
|
|
// Check if they want a resource directory
|
|
if serviceInformation.Permissions.Resources {
|
|
appRouter := main.(func(library.ServiceInitializationInformation) *chi.Mux)(library.ServiceInitializationInformation{
|
|
Domain: serviceInformation.Name,
|
|
Configuration: config.Services[strings.ToLower(serviceInformation.Name)].(map[string]interface{}),
|
|
Outbox: globalOutbox,
|
|
Inbox: inbox,
|
|
ResourceDir: os.DirFS(filepath.Join(config.Global.ResourceDirectory, serviceInformation.ServiceID.String())),
|
|
})
|
|
if appRouter != nil {
|
|
if config.Services[strings.ToLower(serviceInformation.Name)].(map[string]interface{})["subdomain"] != nil {
|
|
hostRouter.Map(config.Services[strings.ToLower(serviceInformation.Name)].(map[string]interface{})["subdomain"].(string), appRouter)
|
|
fmt.Println("Mapped subdomain " + config.Services[strings.ToLower(serviceInformation.Name)].(map[string]interface{})["subdomain"].(string) + " to service " + serviceInformation.Name)
|
|
} else {
|
|
hostRouter.Map("*", appRouter)
|
|
fmt.Println("Mapped service " + serviceInformation.Name + " to all subdomains")
|
|
}
|
|
}
|
|
} else {
|
|
main.(func(library.ServiceInitializationInformation) *chi.Mux)(library.ServiceInitializationInformation{
|
|
Domain: serviceInformation.Name,
|
|
Configuration: config.Services[strings.ToLower(serviceInformation.Name)].(map[string]interface{}),
|
|
Outbox: globalOutbox,
|
|
Inbox: inbox,
|
|
})
|
|
}
|
|
|
|
// Log the service activation
|
|
slog.Info("Service " + serviceInformation.Name + " activated with ID " + serviceInformation.ServiceID.String())
|
|
}
|
|
|
|
// Start the server
|
|
slog.Info("Starting server on " + config.Global.IP + ":" + config.Global.Port)
|
|
router.Mount("/", hostRouter)
|
|
err = http.ListenAndServe(config.Global.IP+":"+config.Global.Port, router)
|
|
if err != nil {
|
|
slog.Error("Error starting server: ", err)
|
|
os.Exit(1)
|
|
}
|
|
}
|