Refactor backend options handling and validation

pkg/backends/backend.go

@@ -1,5 +1,13 @@
 package backends
 
+import (
+	"encoding/json"
+	"fmt"
+	"llamactl/pkg/config"
+	"llamactl/pkg/validation"
+	"maps"
+)
+
 type BackendType string
 
 const (
@@ -13,10 +21,301 @@ type Options struct {
 	BackendType    BackendType    `json:"backend_type"`
 	BackendOptions map[string]any `json:"backend_options,omitempty"`
 
-	Nodes map[string]struct{} `json:"-"`
-
 	// Backend-specific options
 	LlamaServerOptions *LlamaServerOptions `json:"-"`
 	MlxServerOptions   *MlxServerOptions   `json:"-"`
 	VllmServerOptions  *VllmServerOptions  `json:"-"`
 }
+
+func (o *Options) UnmarshalJSON(data []byte) error {
+	// Use anonymous struct to avoid recursion
+	type Alias Options
+	aux := &struct {
+		*Alias
+	}{
+		Alias: (*Alias)(o),
+	}
+
+	if err := json.Unmarshal(data, aux); err != nil {
+		return err
+	}
+
+	// Parse backend-specific options
+	switch o.BackendType {
+	case BackendTypeLlamaCpp:
+		if o.BackendOptions != nil {
+			// Convert map to JSON and then unmarshal to LlamaServerOptions
+			optionsData, err := json.Marshal(o.BackendOptions)
+			if err != nil {
+				return fmt.Errorf("failed to marshal backend options: %w", err)
+			}
+
+			o.LlamaServerOptions = &LlamaServerOptions{}
+			if err := json.Unmarshal(optionsData, o.LlamaServerOptions); err != nil {
+				return fmt.Errorf("failed to unmarshal llama.cpp options: %w", err)
+			}
+		}
+	case BackendTypeMlxLm:
+		if o.BackendOptions != nil {
+			optionsData, err := json.Marshal(o.BackendOptions)
+			if err != nil {
+				return fmt.Errorf("failed to marshal backend options: %w", err)
+			}
+
+			o.MlxServerOptions = &MlxServerOptions{}
+			if err := json.Unmarshal(optionsData, o.MlxServerOptions); err != nil {
+				return fmt.Errorf("failed to unmarshal MLX options: %w", err)
+			}
+		}
+	case BackendTypeVllm:
+		if o.BackendOptions != nil {
+			optionsData, err := json.Marshal(o.BackendOptions)
+			if err != nil {
+				return fmt.Errorf("failed to marshal backend options: %w", err)
+			}
+
+			o.VllmServerOptions = &VllmServerOptions{}
+			if err := json.Unmarshal(optionsData, o.VllmServerOptions); err != nil {
+				return fmt.Errorf("failed to unmarshal vLLM options: %w", err)
+			}
+		}
+	}
+
+	return nil
+}
+
+func (o *Options) MarshalJSON() ([]byte, error) {
+	// Use anonymous struct to avoid recursion
+	type Alias Options
+	aux := &struct {
+		*Alias
+	}{
+		Alias: (*Alias)(o),
+	}
+
+	// Prepare BackendOptions map
+	if o.BackendOptions == nil {
+		o.BackendOptions = make(map[string]any)
+	}
+
+	// Populate BackendOptions based on backend-specific options
+	switch o.BackendType {
+	case BackendTypeLlamaCpp:
+		if o.LlamaServerOptions != nil {
+			optionsData, err := json.Marshal(o.LlamaServerOptions)
+			if err != nil {
+				return nil, fmt.Errorf("failed to marshal llama.cpp options: %w", err)
+			}
+			if err := json.Unmarshal(optionsData, &o.BackendOptions); err != nil {
+				return nil, fmt.Errorf("failed to unmarshal llama.cpp options to map: %w", err)
+			}
+		}
+	case BackendTypeMlxLm:
+		if o.MlxServerOptions != nil {
+			optionsData, err := json.Marshal(o.MlxServerOptions)
+			if err != nil {
+				return nil, fmt.Errorf("failed to marshal MLX options: %w", err)
+			}
+			if err := json.Unmarshal(optionsData, &o.BackendOptions); err != nil {
+				return nil, fmt.Errorf("failed to unmarshal MLX options to map: %w", err)
+			}
+		}
+	case BackendTypeVllm:
+		if o.VllmServerOptions != nil {
+			optionsData, err := json.Marshal(o.VllmServerOptions)
+			if err != nil {
+				return nil, fmt.Errorf("failed to marshal vLLM options: %w", err)
+			}
+			if err := json.Unmarshal(optionsData, &o.BackendOptions); err != nil {
+				return nil, fmt.Errorf("failed to unmarshal vLLM options to map: %w", err)
+			}
+		}
+	}
+
+	return json.Marshal(aux)
+}
+
+func getBackendSettings(o *Options, backendConfig *config.BackendConfig) *config.BackendSettings {
+	switch o.BackendType {
+	case BackendTypeLlamaCpp:
+		return &backendConfig.LlamaCpp
+	case BackendTypeMlxLm:
+		return &backendConfig.MLX
+	case BackendTypeVllm:
+		return &backendConfig.VLLM
+	default:
+		return nil
+	}
+}
+
+func (o *Options) isDockerEnabled(backend *config.BackendSettings) bool {
+	if backend.Docker != nil && backend.Docker.Enabled && o.BackendType != BackendTypeMlxLm {
+		return true
+	}
+	return false
+}
+
+func (o *Options) IsDockerEnabled(backendConfig *config.BackendConfig) bool {
+	backendSettings := getBackendSettings(o, backendConfig)
+	return o.isDockerEnabled(backendSettings)
+}
+
+// GetCommand builds the command to run the backend
+func (o *Options) GetCommand(backendConfig *config.BackendConfig) string {
+
+	backendSettings := getBackendSettings(o, backendConfig)
+
+	if o.isDockerEnabled(backendSettings) {
+		return "docker"
+	}
+
+	return backendSettings.Command
+}
+
+// buildCommandArgs builds command line arguments for the backend
+func (o *Options) BuildCommandArgs(backendConfig *config.BackendConfig) []string {
+
+	var args []string
+
+	backendSettings := getBackendSettings(o, backendConfig)
+
+	if o.isDockerEnabled(backendSettings) {
+		// For Docker, start with Docker args
+		args = append(args, backendSettings.Docker.Args...)
+		args = append(args, backendSettings.Docker.Image)
+
+		switch o.BackendType {
+		case BackendTypeLlamaCpp:
+			if o.LlamaServerOptions != nil {
+				args = append(args, o.LlamaServerOptions.BuildDockerArgs()...)
+			}
+		case BackendTypeVllm:
+			if o.VllmServerOptions != nil {
+				args = append(args, o.VllmServerOptions.BuildDockerArgs()...)
+			}
+		}
+
+	} else {
+		// For native execution, start with backend args
+		args = append(args, backendSettings.Args...)
+
+		switch o.BackendType {
+		case BackendTypeLlamaCpp:
+			if o.LlamaServerOptions != nil {
+				args = append(args, o.LlamaServerOptions.BuildCommandArgs()...)
+			}
+		case BackendTypeMlxLm:
+			if o.MlxServerOptions != nil {
+				args = append(args, o.MlxServerOptions.BuildCommandArgs()...)
+			}
+		case BackendTypeVllm:
+			if o.VllmServerOptions != nil {
+				args = append(args, o.VllmServerOptions.BuildCommandArgs()...)
+			}
+		}
+	}
+
+	return args
+}
+
+// BuildEnvironment builds the environment variables for the backend process
+func (o *Options) BuildEnvironment(backendConfig *config.BackendConfig, environment map[string]string) map[string]string {
+
+	backendSettings := getBackendSettings(o, backendConfig)
+	env := map[string]string{}
+
+	if backendSettings.Environment != nil {
+		maps.Copy(env, backendSettings.Environment)
+	}
+
+	if o.isDockerEnabled(backendSettings) {
+		if backendSettings.Docker.Environment != nil {
+			maps.Copy(env, backendSettings.Docker.Environment)
+		}
+	}
+
+	if environment != nil {
+		maps.Copy(env, environment)
+	}
+
+	return env
+}
+
+func (o *Options) GetPort() int {
+	if o != nil {
+		switch o.BackendType {
+		case BackendTypeLlamaCpp:
+			if o.LlamaServerOptions != nil {
+				return o.LlamaServerOptions.Port
+			}
+		case BackendTypeMlxLm:
+			if o.MlxServerOptions != nil {
+				return o.MlxServerOptions.Port
+			}
+		case BackendTypeVllm:
+			if o.VllmServerOptions != nil {
+				return o.VllmServerOptions.Port
+			}
+		}
+	}
+	return 0
+}
+
+func (o *Options) SetPort(port int) {
+	if o != nil {
+		switch o.BackendType {
+		case BackendTypeLlamaCpp:
+			if o.LlamaServerOptions != nil {
+				o.LlamaServerOptions.Port = port
+			}
+		case BackendTypeMlxLm:
+			if o.MlxServerOptions != nil {
+				o.MlxServerOptions.Port = port
+			}
+		case BackendTypeVllm:
+			if o.VllmServerOptions != nil {
+				o.VllmServerOptions.Port = port
+			}
+		}
+	}
+}
+
+func (o *Options) GetHost() string {
+	if o != nil {
+		switch o.BackendType {
+		case BackendTypeLlamaCpp:
+			if o.LlamaServerOptions != nil {
+				return o.LlamaServerOptions.Host
+			}
+		case BackendTypeMlxLm:
+			if o.MlxServerOptions != nil {
+				return o.MlxServerOptions.Host
+			}
+		case BackendTypeVllm:
+			if o.VllmServerOptions != nil {
+				return o.VllmServerOptions.Host
+			}
+		}
+	}
+	return "localhost"
+}
+
+func (o *Options) GetResponseHeaders(backendConfig *config.BackendConfig) map[string]string {
+	backendSettings := getBackendSettings(o, backendConfig)
+	return backendSettings.ResponseHeaders
+}
+
+// ValidateInstanceOptions performs validation based on backend type
+func (o *Options) ValidateInstanceOptions() error {
+	// Validate based on backend type
+	switch o.BackendType {
+	case BackendTypeLlamaCpp:
+		return validateLlamaCppOptions(o.LlamaServerOptions)
+	case BackendTypeMlxLm:
+		return validateMlxOptions(o.MlxServerOptions)
+	case BackendTypeVllm:
+		return validateVllmOptions(o.VllmServerOptions)
+	default:
+		return validation.ValidationError(fmt.Errorf("unsupported backend type: %s", o.BackendType))
+	}
+}

pkg/backends/llama.go

@@ -2,6 +2,8 @@ package backends
 
 import (
 	"encoding/json"
+	"fmt"
+	"llamactl/pkg/validation"
 	"reflect"
 	"strconv"
 )
@@ -364,3 +366,22 @@ func ParseLlamaCommand(command string) (*LlamaServerOptions, error) {
 
 	return &llamaOptions, nil
 }
+
+// validateLlamaCppOptions validates llama.cpp specific options
+func validateLlamaCppOptions(options *LlamaServerOptions) error {
+	if options == nil {
+		return validation.ValidationError(fmt.Errorf("llama server options cannot be nil for llama.cpp backend"))
+	}
+
+	// Use reflection to check all string fields for injection patterns
+	if err := validation.ValidateStructStrings(options, ""); err != nil {
+		return err
+	}
+
+	// Basic network validation for port
+	if options.Port < 0 || options.Port > 65535 {
+		return validation.ValidationError(fmt.Errorf("invalid port range: %d", options.Port))
+	}
+
+	return nil
+}

pkg/backends/mlx.go

@@ -1,5 +1,10 @@
 package backends
 
+import (
+	"fmt"
+	"llamactl/pkg/validation"
+)
+
 type MlxServerOptions struct {
 	// Basic connection options
 	Model string `json:"model,omitempty"`
@@ -50,3 +55,21 @@ func ParseMlxCommand(command string) (*MlxServerOptions, error) {
 
 	return &mlxOptions, nil
 }
+
+// validateMlxOptions validates MLX backend specific options
+func validateMlxOptions(options *MlxServerOptions) error {
+	if options == nil {
+		return validation.ValidationError(fmt.Errorf("MLX server options cannot be nil for MLX backend"))
+	}
+
+	if err := validation.ValidateStructStrings(options, ""); err != nil {
+		return err
+	}
+
+	// Basic network validation for port
+	if options.Port < 0 || options.Port > 65535 {
+		return validation.ValidationError(fmt.Errorf("invalid port range: %d", options.Port))
+	}
+
+	return nil
+}

pkg/backends/vllm.go

@@ -1,5 +1,10 @@
 package backends
 
+import (
+	"fmt"
+	"llamactl/pkg/validation"
+)
+
 // vllmMultiValuedFlags defines flags that should be repeated for each value rather than comma-separated
 var vllmMultiValuedFlags = map[string]bool{
 	"api-key":         true,
@@ -194,3 +199,22 @@ func ParseVllmCommand(command string) (*VllmServerOptions, error) {
 
 	return &vllmOptions, nil
 }
+
+// validateVllmOptions validates vLLM backend specific options
+func validateVllmOptions(options *VllmServerOptions) error {
+	if options == nil {
+		return validation.ValidationError(fmt.Errorf("vLLM server options cannot be nil for vLLM backend"))
+	}
+
+	// Use reflection to check all string fields for injection patterns
+	if err := validation.ValidateStructStrings(options, ""); err != nil {
+		return err
+	}
+
+	// Basic network validation for port
+	if options.Port < 0 || options.Port > 65535 {
+		return validation.ValidationError(fmt.Errorf("invalid port range: %d", options.Port))
+	}
+
+	return nil
+}

pkg/instance/instance.go

@@ -3,7 +3,6 @@ package instance
 import (
 	"encoding/json"
 	"fmt"
-	"llamactl/pkg/backends"
 	"llamactl/pkg/config"
 	"log"
 	"net/http/httputil"
@@ -124,48 +123,6 @@ func (i *Instance) IsRunning() bool {
 	return i.status.isRunning()
 }
 
-func (i *Instance) GetPort() int {
-	opts := i.GetOptions()
-	if opts != nil {
-		switch opts.BackendType {
-		case backends.BackendTypeLlamaCpp:
-			if opts.LlamaServerOptions != nil {
-				return opts.LlamaServerOptions.Port
-			}
-		case backends.BackendTypeMlxLm:
-			if opts.MlxServerOptions != nil {
-				return opts.MlxServerOptions.Port
-			}
-		case backends.BackendTypeVllm:
-			if opts.VllmServerOptions != nil {
-				return opts.VllmServerOptions.Port
-			}
-		}
-	}
-	return 0
-}
-
-func (i *Instance) GetHost() string {
-	opts := i.GetOptions()
-	if opts != nil {
-		switch opts.BackendType {
-		case backends.BackendTypeLlamaCpp:
-			if opts.LlamaServerOptions != nil {
-				return opts.LlamaServerOptions.Host
-			}
-		case backends.BackendTypeMlxLm:
-			if opts.MlxServerOptions != nil {
-				return opts.MlxServerOptions.Host
-			}
-		case backends.BackendTypeVllm:
-			if opts.VllmServerOptions != nil {
-				return opts.VllmServerOptions.Host
-			}
-		}
-	}
-	return ""
-}
-
 // SetOptions sets the options
 func (i *Instance) SetOptions(opts *Options) {
 	if opts == nil {
@@ -198,6 +155,20 @@ func (i *Instance) SetTimeProvider(tp TimeProvider) {
 	}
 }
 
+func (i *Instance) GetHost() string {
+	if i.options == nil {
+		return "localhost"
+	}
+	return i.options.GetHost()
+}
+
+func (i *Instance) GetPort() int {
+	if i.options == nil {
+		return 0
+	}
+	return i.options.GetPort()
+}
+
 // GetProxy returns the reverse proxy for this instance
 func (i *Instance) GetProxy() (*httputil.ReverseProxy, error) {
 	if i.proxy == nil {
@@ -266,39 +237,31 @@ func (i *Instance) ShouldTimeout() bool {
 	return i.proxy.shouldTimeout()
 }
 
-// getBackendHostPort extracts the host and port from instance options
+func (i *Instance) getCommand() string {
-// Returns the configured host and port for the backend
-func (i *Instance) getBackendHostPort() (string, int) {
 	opts := i.GetOptions()
 	if opts == nil {
-		return "localhost", 0
+		return ""
 	}
 
-	var host string
+	return opts.BackendOptions.GetCommand(i.globalBackendSettings)
-	var port int
-	switch opts.BackendType {
-	case backends.BackendTypeLlamaCpp:
-		if opts.LlamaServerOptions != nil {
-			host = opts.LlamaServerOptions.Host
-			port = opts.LlamaServerOptions.Port
-		}
-	case backends.BackendTypeMlxLm:
-		if opts.MlxServerOptions != nil {
-			host = opts.MlxServerOptions.Host
-			port = opts.MlxServerOptions.Port
-		}
-	case backends.BackendTypeVllm:
-		if opts.VllmServerOptions != nil {
-			host = opts.VllmServerOptions.Host
-			port = opts.VllmServerOptions.Port
-		}
 }
 
-	if host == "" {
+func (i *Instance) buildCommandArgs() []string {
-		host = "localhost"
+	opts := i.GetOptions()
+	if opts == nil {
+		return nil
 	}
 
-	return host, port
+	return opts.BackendOptions.BuildCommandArgs(i.globalBackendSettings)
+}
+
+func (i *Instance) buildEnvironment() map[string]string {
+	opts := i.GetOptions()
+	if opts == nil {
+		return nil
+	}
+
+	return opts.BackendOptions.BuildEnvironment(i.globalBackendSettings, opts.Environment)
 }
 
 // MarshalJSON implements json.Marshaler for Instance
@@ -307,21 +270,7 @@ func (i *Instance) MarshalJSON() ([]byte, error) {
 	opts := i.GetOptions()
 
 	// Determine if docker is enabled for this instance's backend
-	var dockerEnabled bool
+	dockerEnabled := opts.BackendOptions.IsDockerEnabled(i.globalBackendSettings)
-	if opts != nil {
-		switch opts.BackendType {
-		case backends.BackendTypeLlamaCpp:
-			if i.globalBackendSettings != nil && i.globalBackendSettings.LlamaCpp.Docker != nil && i.globalBackendSettings.LlamaCpp.Docker.Enabled {
-				dockerEnabled = true
-			}
-		case backends.BackendTypeVllm:
-			if i.globalBackendSettings != nil && i.globalBackendSettings.VLLM.Docker != nil && i.globalBackendSettings.VLLM.Docker.Enabled {
-				dockerEnabled = true
-			}
-		case backends.BackendTypeMlxLm:
-			// MLX does not support docker currently
-		}
-	}
 
 	return json.Marshal(&struct {
 		Name          string   `json:"name"`

pkg/instance/options.go

@@ -6,7 +6,6 @@ import (
 	"llamactl/pkg/backends"
 	"llamactl/pkg/config"
 	"log"
-	"maps"
 	"slices"
 	"sync"
 )
@@ -23,16 +22,10 @@ type Options struct {
 	IdleTimeout *int `json:"idle_timeout,omitempty"` // minutes
 	// Environment variables
 	Environment map[string]string `json:"environment,omitempty"`
-
+	// Assigned nodes
-	BackendType    backends.BackendType `json:"backend_type"`
-	BackendOptions map[string]any       `json:"backend_options,omitempty"`
-
 	Nodes map[string]struct{} `json:"-"`
-
+	// Backend options
-	// Backend-specific options
+	BackendOptions backends.Options `json:"-"`
-	LlamaServerOptions *backends.LlamaServerOptions `json:"-"`
-	MlxServerOptions   *backends.MlxServerOptions   `json:"-"`
-	VllmServerOptions  *backends.VllmServerOptions  `json:"-"`
 }
 
 // options wraps Options with thread-safe access (unexported).
@@ -62,6 +55,18 @@ func (o *options) set(opts *Options) {
 	o.opts = opts
 }
 
+func (o *options) GetHost() string {
+	o.mu.RLock()
+	defer o.mu.RUnlock()
+	return o.opts.BackendOptions.GetHost()
+}
+
+func (o *options) GetPort() int {
+	o.mu.RLock()
+	defer o.mu.RUnlock()
+	return o.opts.BackendOptions.GetPort()
+}
+
 // MarshalJSON implements json.Marshaler for options wrapper
 func (o *options) MarshalJSON() ([]byte, error) {
 	o.mu.RLock()
@@ -85,7 +90,9 @@ func (c *Options) UnmarshalJSON(data []byte) error {
 	// Use anonymous struct to avoid recursion
 	type Alias Options
 	aux := &struct {
-		Nodes []string `json:"nodes,omitempty"` // Accept JSON array
+		Nodes          []string             `json:"nodes,omitempty"`
+		BackendType    backends.BackendType `json:"backend_type"`
+		BackendOptions map[string]any       `json:"backend_options,omitempty"`
 		*Alias
 	}{
 		Alias: (*Alias)(c),
@@ -103,47 +110,27 @@ func (c *Options) UnmarshalJSON(data []byte) error {
 		}
 	}
 
-	// Parse backend-specific options
+	// Create backend options struct and unmarshal
-	switch c.BackendType {
+	c.BackendOptions = backends.Options{
-	case backends.BackendTypeLlamaCpp:
+		BackendType:    aux.BackendType,
-		if c.BackendOptions != nil {
+		BackendOptions: aux.BackendOptions,
-			// Convert map to JSON and then unmarshal to LlamaServerOptions
+	}
-			optionsData, err := json.Marshal(c.BackendOptions)
+
+	// Marshal the backend options to JSON for proper unmarshaling
+	backendJson, err := json.Marshal(struct {
+		BackendType    backends.BackendType `json:"backend_type"`
+		BackendOptions map[string]any       `json:"backend_options,omitempty"`
+	}{
+		BackendType:    aux.BackendType,
+		BackendOptions: aux.BackendOptions,
+	})
 	if err != nil {
 		return fmt.Errorf("failed to marshal backend options: %w", err)
 	}
 
-			c.LlamaServerOptions = &backends.LlamaServerOptions{}
+	// Unmarshal into the backends.Options struct to trigger its custom unmarshaling
-			if err := json.Unmarshal(optionsData, c.LlamaServerOptions); err != nil {
+	if err := json.Unmarshal(backendJson, &c.BackendOptions); err != nil {
-				return fmt.Errorf("failed to unmarshal llama.cpp options: %w", err)
+		return fmt.Errorf("failed to unmarshal backend options: %w", err)
-			}
-		}
-	case backends.BackendTypeMlxLm:
-		if c.BackendOptions != nil {
-			optionsData, err := json.Marshal(c.BackendOptions)
-			if err != nil {
-				return fmt.Errorf("failed to marshal backend options: %w", err)
-			}
-
-			c.MlxServerOptions = &backends.MlxServerOptions{}
-			if err := json.Unmarshal(optionsData, c.MlxServerOptions); err != nil {
-				return fmt.Errorf("failed to unmarshal MLX options: %w", err)
-			}
-		}
-	case backends.BackendTypeVllm:
-		if c.BackendOptions != nil {
-			optionsData, err := json.Marshal(c.BackendOptions)
-			if err != nil {
-				return fmt.Errorf("failed to marshal backend options: %w", err)
-			}
-
-			c.VllmServerOptions = &backends.VllmServerOptions{}
-			if err := json.Unmarshal(optionsData, c.VllmServerOptions); err != nil {
-				return fmt.Errorf("failed to unmarshal vLLM options: %w", err)
-			}
-		}
-	default:
-		return fmt.Errorf("unknown backend type: %s", c.BackendType)
 	}
 
 	return nil
@@ -155,6 +142,8 @@ func (c *Options) MarshalJSON() ([]byte, error) {
 	type Alias Options
 	aux := struct {
 		Nodes          []string             `json:"nodes,omitempty"` // Output as JSON array
+		BackendType    backends.BackendType `json:"backend_type"`
+		BackendOptions map[string]any       `json:"backend_options,omitempty"`
 		*Alias
 	}{
 		Alias: (*Alias)(c),
@@ -170,51 +159,24 @@ func (c *Options) MarshalJSON() ([]byte, error) {
 		slices.Sort(aux.Nodes)
 	}
 
-	// Convert backend-specific options back to BackendOptions map for JSON
+	// Set backend type
-	switch c.BackendType {
+	aux.BackendType = c.BackendOptions.BackendType
-	case backends.BackendTypeLlamaCpp:
+
-		if c.LlamaServerOptions != nil {
+	// Marshal the backends.Options struct to get the properly formatted backend options
-			data, err := json.Marshal(c.LlamaServerOptions)
+	backendData, err := json.Marshal(c.BackendOptions)
 	if err != nil {
-				return nil, fmt.Errorf("failed to marshal llama server options: %w", err)
+		return nil, fmt.Errorf("failed to marshal backend options: %w", err)
 	}
 
-			var backendOpts map[string]any
+	// Unmarshal into a temporary struct to extract the backend_options map
-			if err := json.Unmarshal(data, &backendOpts); err != nil {
+	var tempBackend struct {
-				return nil, fmt.Errorf("failed to unmarshal to map: %w", err)
+		BackendOptions map[string]any `json:"backend_options,omitempty"`
+	}
+	if err := json.Unmarshal(backendData, &tempBackend); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal backend data: %w", err)
 	}
 
-			aux.BackendOptions = backendOpts
+	aux.BackendOptions = tempBackend.BackendOptions
-		}
-	case backends.BackendTypeMlxLm:
-		if c.MlxServerOptions != nil {
-			data, err := json.Marshal(c.MlxServerOptions)
-			if err != nil {
-				return nil, fmt.Errorf("failed to marshal MLX server options: %w", err)
-			}
-
-			var backendOpts map[string]any
-			if err := json.Unmarshal(data, &backendOpts); err != nil {
-				return nil, fmt.Errorf("failed to unmarshal to map: %w", err)
-			}
-
-			aux.BackendOptions = backendOpts
-		}
-	case backends.BackendTypeVllm:
-		if c.VllmServerOptions != nil {
-			data, err := json.Marshal(c.VllmServerOptions)
-			if err != nil {
-				return nil, fmt.Errorf("failed to marshal vLLM server options: %w", err)
-			}
-
-			var backendOpts map[string]any
-			if err := json.Unmarshal(data, &backendOpts); err != nil {
-				return nil, fmt.Errorf("failed to unmarshal to map: %w", err)
-			}
-
-			aux.BackendOptions = backendOpts
-		}
-	}
 
 	return json.Marshal(aux)
 }
@@ -257,78 +219,3 @@ func (c *Options) validateAndApplyDefaults(name string, globalSettings *config.I
 		}
 	}
 }
-
-// getCommand builds the command to run the backend
-func (c *Options) getCommand(backendConfig *config.BackendSettings) string {
-
-	if backendConfig.Docker != nil && backendConfig.Docker.Enabled && c.BackendType != backends.BackendTypeMlxLm {
-		return "docker"
-	}
-
-	return backendConfig.Command
-}
-
-// buildCommandArgs builds command line arguments for the backend
-func (c *Options) buildCommandArgs(backendConfig *config.BackendSettings) []string {
-
-	var args []string
-
-	if backendConfig.Docker != nil && backendConfig.Docker.Enabled && c.BackendType != backends.BackendTypeMlxLm {
-		// For Docker, start with Docker args
-		args = append(args, backendConfig.Docker.Args...)
-		args = append(args, backendConfig.Docker.Image)
-
-		switch c.BackendType {
-		case backends.BackendTypeLlamaCpp:
-			if c.LlamaServerOptions != nil {
-				args = append(args, c.LlamaServerOptions.BuildDockerArgs()...)
-			}
-		case backends.BackendTypeVllm:
-			if c.VllmServerOptions != nil {
-				args = append(args, c.VllmServerOptions.BuildDockerArgs()...)
-			}
-		}
-
-	} else {
-		// For native execution, start with backend args
-		args = append(args, backendConfig.Args...)
-
-		switch c.BackendType {
-		case backends.BackendTypeLlamaCpp:
-			if c.LlamaServerOptions != nil {
-				args = append(args, c.LlamaServerOptions.BuildCommandArgs()...)
-			}
-		case backends.BackendTypeMlxLm:
-			if c.MlxServerOptions != nil {
-				args = append(args, c.MlxServerOptions.BuildCommandArgs()...)
-			}
-		case backends.BackendTypeVllm:
-			if c.VllmServerOptions != nil {
-				args = append(args, c.VllmServerOptions.BuildCommandArgs()...)
-			}
-		}
-	}
-
-	return args
-}
-
-// buildEnvironment builds the environment variables for the backend process
-func (c *Options) buildEnvironment(backendConfig *config.BackendSettings) map[string]string {
-	env := map[string]string{}
-
-	if backendConfig.Environment != nil {
-		maps.Copy(env, backendConfig.Environment)
-	}
-
-	if backendConfig.Docker != nil && backendConfig.Docker.Enabled && c.BackendType != backends.BackendTypeMlxLm {
-		if backendConfig.Docker.Environment != nil {
-			maps.Copy(env, backendConfig.Docker.Environment)
-		}
-	}
-
-	if c.Environment != nil {
-		maps.Copy(env, c.Environment)
-	}
-
-	return env
-}

pkg/instance/process.go

@@ -12,9 +12,6 @@ import (
 	"sync"
 	"syscall"
 	"time"
-
-	"llamactl/pkg/backends"
-	"llamactl/pkg/config"
 )
 
 // process manages the OS process lifecycle for a local instance.
@@ -216,7 +213,8 @@ func (p *process) waitForHealthy(timeout int) error {
 	defer cancel()
 
 	// Get host/port from instance
-	host, port := p.instance.getBackendHostPort()
+	host := p.instance.options.GetHost()
+	port := p.instance.options.GetPort()
 	healthURL := fmt.Sprintf("http://%s:%d/health", host, port)
 
 	// Create a dedicated HTTP client for health checks
@@ -386,26 +384,15 @@ func (p *process) handleAutoRestart(err error) {
 
 // buildCommand builds the command to execute using backend-specific logic
 func (p *process) buildCommand() (*exec.Cmd, error) {
-	// Get options
-	opts := p.instance.GetOptions()
-	if opts == nil {
-		return nil, fmt.Errorf("instance options are nil")
-	}
-
-	// Get backend configuration
-	backendConfig, err := p.getBackendConfig()
-	if err != nil {
-		return nil, err
-	}
 
 	// Build the environment variables
-	env := opts.buildEnvironment(backendConfig)
+	env := p.instance.buildEnvironment()
 
 	// Get the command to execute
-	command := opts.getCommand(backendConfig)
+	command := p.instance.getCommand()
 
 	// Build command arguments
-	args := opts.buildCommandArgs(backendConfig)
+	args := p.instance.buildCommandArgs()
 
 	// Create the exec.Cmd
 	cmd := exec.CommandContext(p.ctx, command, args...)
@@ -420,27 +407,3 @@ func (p *process) buildCommand() (*exec.Cmd, error) {
 
 	return cmd, nil
 }
-
-// getBackendConfig resolves the backend configuration for the current instance
-func (p *process) getBackendConfig() (*config.BackendSettings, error) {
-	opts := p.instance.GetOptions()
-	if opts == nil {
-		return nil, fmt.Errorf("instance options are nil")
-	}
-
-	var backendTypeStr string
-
-	switch opts.BackendType {
-	case backends.BackendTypeLlamaCpp:
-		backendTypeStr = "llama-cpp"
-	case backends.BackendTypeMlxLm:
-		backendTypeStr = "mlx"
-	case backends.BackendTypeVllm:
-		backendTypeStr = "vllm"
-	default:
-		return nil, fmt.Errorf("unsupported backend type: %s", opts.BackendType)
-	}
-
-	settings := p.instance.globalBackendSettings.GetBackendSettings(backendTypeStr)
-	return &settings, nil
-}

pkg/instance/proxy.go

@@ -2,7 +2,6 @@ package instance
 
 import (
 	"fmt"
-	"llamactl/pkg/backends"
 	"net/http"
 	"net/http/httputil"
 	"net/url"
@@ -68,8 +67,11 @@ func (p *proxy) build() (*httputil.ReverseProxy, error) {
 	}
 
 	// Get host/port from process
-	host, port := p.instance.getBackendHostPort()
+	host := p.instance.options.GetHost()
-
+	port := p.instance.options.GetPort()
+	if port == 0 {
+		return nil, fmt.Errorf("instance %s has no port assigned", p.instance.Name)
+	}
 	targetURL, err := url.Parse(fmt.Sprintf("http://%s:%d", host, port))
 	if err != nil {
 		return nil, fmt.Errorf("failed to parse target URL for instance %s: %w", p.instance.Name, err)
@@ -78,15 +80,7 @@ func (p *proxy) build() (*httputil.ReverseProxy, error) {
 	proxy := httputil.NewSingleHostReverseProxy(targetURL)
 
 	// Get response headers from backend config
-	var responseHeaders map[string]string
+	responseHeaders := options.BackendOptions.GetResponseHeaders(p.instance.globalBackendSettings)
-	switch options.BackendType {
-	case backends.BackendTypeLlamaCpp:
-		responseHeaders = p.instance.globalBackendSettings.LlamaCpp.ResponseHeaders
-	case backends.BackendTypeVllm:
-		responseHeaders = p.instance.globalBackendSettings.VLLM.ResponseHeaders
-	case backends.BackendTypeMlxLm:
-		responseHeaders = p.instance.globalBackendSettings.MLX.ResponseHeaders
-	}
 
 	proxy.ModifyResponse = func(resp *http.Response) error {
 		// Remove CORS headers from backend response to avoid conflicts

pkg/manager/operations.go

@@ -2,7 +2,6 @@ package manager
 
 import (
 	"fmt"
-	"llamactl/pkg/backends"
 	"llamactl/pkg/instance"
 	"llamactl/pkg/validation"
 	"os"
@@ -86,7 +85,7 @@ func (im *instanceManager) CreateInstance(name string, options *instance.Options
 		return nil, err
 	}
 
-	err = validation.ValidateInstanceOptions(options)
+	err = options.BackendOptions.ValidateInstanceOptions()
 	if err != nil {
 		return nil, err
 	}
@@ -232,7 +231,7 @@ func (im *instanceManager) UpdateInstance(name string, options *instance.Options
 		return nil, fmt.Errorf("instance options cannot be nil")
 	}
 
-	err := validation.ValidateInstanceOptions(options)
+	err := options.BackendOptions.ValidateInstanceOptions()
 	if err != nil {
 		return nil, err
 	}
@@ -493,39 +492,12 @@ func (im *instanceManager) GetInstanceLogs(name string, numLines int) (string, e
 
 // getPortFromOptions extracts the port from backend-specific options
 func (im *instanceManager) getPortFromOptions(options *instance.Options) int {
-	switch options.BackendType {
+	return options.BackendOptions.GetPort()
-	case backends.BackendTypeLlamaCpp:
-		if options.LlamaServerOptions != nil {
-			return options.LlamaServerOptions.Port
-		}
-	case backends.BackendTypeMlxLm:
-		if options.MlxServerOptions != nil {
-			return options.MlxServerOptions.Port
-		}
-	case backends.BackendTypeVllm:
-		if options.VllmServerOptions != nil {
-			return options.VllmServerOptions.Port
-		}
-	}
-	return 0
 }
 
 // setPortInOptions sets the port in backend-specific options
 func (im *instanceManager) setPortInOptions(options *instance.Options, port int) {
-	switch options.BackendType {
+	options.BackendOptions.SetPort(port)
-	case backends.BackendTypeLlamaCpp:
-		if options.LlamaServerOptions != nil {
-			options.LlamaServerOptions.Port = port
-		}
-	case backends.BackendTypeMlxLm:
-		if options.MlxServerOptions != nil {
-			options.MlxServerOptions.Port = port
-		}
-	case backends.BackendTypeVllm:
-		if options.VllmServerOptions != nil {
-			options.VllmServerOptions.Port = port
-		}
-	}
 }
 
 // assignAndValidatePort assigns a port if not specified and validates it's not in use

pkg/validation/validation.go

@@ -2,8 +2,6 @@ package validation
 
 import (
 	"fmt"
-	"llamactl/pkg/backends"
-	"llamactl/pkg/instance"
 	"reflect"
 	"regexp"
 )
@@ -24,8 +22,8 @@ var (
 
 type ValidationError error
 
-// validateStringForInjection checks if a string contains dangerous patterns
+// ValidateStringForInjection checks if a string contains dangerous patterns
-func validateStringForInjection(value string) error {
+func ValidateStringForInjection(value string) error {
 	for _, pattern := range dangerousPatterns {
 		if pattern.MatchString(value) {
 			return ValidationError(fmt.Errorf("value contains potentially dangerous characters: %s", value))
@@ -34,83 +32,8 @@ func validateStringForInjection(value string) error {
 	return nil
 }
 
-// ValidateInstanceOptions performs validation based on backend type
+// ValidateStructStrings recursively validates all string fields in a struct
-func ValidateInstanceOptions(options *instance.Options) error {
+func ValidateStructStrings(v any, fieldPath string) error {
-	if options == nil {
-		return ValidationError(fmt.Errorf("options cannot be nil"))
-	}
-
-	// Validate based on backend type
-	switch options.BackendType {
-	case backends.BackendTypeLlamaCpp:
-		return validateLlamaCppOptions(options)
-	case backends.BackendTypeMlxLm:
-		return validateMlxOptions(options)
-	case backends.BackendTypeVllm:
-		return validateVllmOptions(options)
-	default:
-		return ValidationError(fmt.Errorf("unsupported backend type: %s", options.BackendType))
-	}
-}
-
-// validateLlamaCppOptions validates llama.cpp specific options
-func validateLlamaCppOptions(options *instance.Options) error {
-	if options.LlamaServerOptions == nil {
-		return ValidationError(fmt.Errorf("llama server options cannot be nil for llama.cpp backend"))
-	}
-
-	// Use reflection to check all string fields for injection patterns
-	if err := validateStructStrings(options.LlamaServerOptions, ""); err != nil {
-		return err
-	}
-
-	// Basic network validation for port
-	if options.LlamaServerOptions.Port < 0 || options.LlamaServerOptions.Port > 65535 {
-		return ValidationError(fmt.Errorf("invalid port range: %d", options.LlamaServerOptions.Port))
-	}
-
-	return nil
-}
-
-// validateMlxOptions validates MLX backend specific options
-func validateMlxOptions(options *instance.Options) error {
-	if options.MlxServerOptions == nil {
-		return ValidationError(fmt.Errorf("MLX server options cannot be nil for MLX backend"))
-	}
-
-	if err := validateStructStrings(options.MlxServerOptions, ""); err != nil {
-		return err
-	}
-
-	// Basic network validation for port
-	if options.MlxServerOptions.Port < 0 || options.MlxServerOptions.Port > 65535 {
-		return ValidationError(fmt.Errorf("invalid port range: %d", options.MlxServerOptions.Port))
-	}
-
-	return nil
-}
-
-// validateVllmOptions validates vLLM backend specific options
-func validateVllmOptions(options *instance.Options) error {
-	if options.VllmServerOptions == nil {
-		return ValidationError(fmt.Errorf("vLLM server options cannot be nil for vLLM backend"))
-	}
-
-	// Use reflection to check all string fields for injection patterns
-	if err := validateStructStrings(options.VllmServerOptions, ""); err != nil {
-		return err
-	}
-
-	// Basic network validation for port
-	if options.VllmServerOptions.Port < 0 || options.VllmServerOptions.Port > 65535 {
-		return ValidationError(fmt.Errorf("invalid port range: %d", options.VllmServerOptions.Port))
-	}
-
-	return nil
-}
-
-// validateStructStrings recursively validates all string fields in a struct
-func validateStructStrings(v any, fieldPath string) error {
 	val := reflect.ValueOf(v)
 	if val.Kind() == reflect.Ptr {
 		val = val.Elem()
@@ -136,21 +59,21 @@ func validateStructStrings(v any, fieldPath string) error {
 
 		switch field.Kind() {
 		case reflect.String:
-			if err := validateStringForInjection(field.String()); err != nil {
+			if err := ValidateStringForInjection(field.String()); err != nil {
 				return ValidationError(fmt.Errorf("field %s: %w", fieldName, err))
 			}
 
 		case reflect.Slice:
 			if field.Type().Elem().Kind() == reflect.String {
 				for j := 0; j < field.Len(); j++ {
-					if err := validateStringForInjection(field.Index(j).String()); err != nil {
+					if err := ValidateStringForInjection(field.Index(j).String()); err != nil {
 						return ValidationError(fmt.Errorf("field %s[%d]: %w", fieldName, j, err))
 					}
 				}
 			}
 
 		case reflect.Struct:
-			if err := validateStructStrings(field.Interface(), fieldName); err != nil {
+			if err := ValidateStructStrings(field.Interface(), fieldName); err != nil {
 				return err
 			}
 		}