130 lines
3.6 KiB
Go
130 lines
3.6 KiB
Go
package plugins
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import (
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"context"
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"fmt"
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"net/http"
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"github.com/traefik/yaegi/interp"
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"github.com/traefik/yaegi/stdlib"
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)
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// Constructor creates a plugin handler.
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type Constructor func(context.Context, http.Handler) (http.Handler, error)
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// pluginContext The static part of a plugin configuration.
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type pluginContext struct {
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// GoPath plugin's GOPATH
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GoPath string `json:"goPath,omitempty" toml:"goPath,omitempty" yaml:"goPath,omitempty"`
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// Import plugin's import/package
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Import string `json:"import,omitempty" toml:"import,omitempty" yaml:"import,omitempty"`
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// BasePkg plugin's base package name (optional)
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BasePkg string `json:"basePkg,omitempty" toml:"basePkg,omitempty" yaml:"basePkg,omitempty"`
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interpreter *interp.Interpreter
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}
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// Builder is a plugin builder.
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type Builder struct {
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middlewareDescriptors map[string]pluginContext
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providerDescriptors map[string]pluginContext
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}
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// NewBuilder creates a new Builder.
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func NewBuilder(client *Client, plugins map[string]Descriptor, localPlugins map[string]LocalDescriptor) (*Builder, error) {
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pb := &Builder{
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middlewareDescriptors: map[string]pluginContext{},
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providerDescriptors: map[string]pluginContext{},
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}
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for pName, desc := range plugins {
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manifest, err := client.ReadManifest(desc.ModuleName)
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if err != nil {
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_ = client.ResetAll()
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return nil, fmt.Errorf("%s: failed to read manifest: %w", desc.ModuleName, err)
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}
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i := interp.New(interp.Options{GoPath: client.GoPath()})
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err = i.Use(stdlib.Symbols)
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if err != nil {
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return nil, fmt.Errorf("%s: failed to load symbols: %w", desc.ModuleName, err)
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}
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err = i.Use(ppSymbols())
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if err != nil {
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return nil, fmt.Errorf("%s: failed to load provider symbols: %w", desc.ModuleName, err)
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}
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_, err = i.Eval(fmt.Sprintf(`import "%s"`, manifest.Import))
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if err != nil {
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return nil, fmt.Errorf("%s: failed to import plugin code %q: %w", desc.ModuleName, manifest.Import, err)
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}
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switch manifest.Type {
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case "middleware":
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pb.middlewareDescriptors[pName] = pluginContext{
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interpreter: i,
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GoPath: client.GoPath(),
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Import: manifest.Import,
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BasePkg: manifest.BasePkg,
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}
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case "provider":
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pb.providerDescriptors[pName] = pluginContext{
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interpreter: i,
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GoPath: client.GoPath(),
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Import: manifest.Import,
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BasePkg: manifest.BasePkg,
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}
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default:
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return nil, fmt.Errorf("unknow plugin type: %s", manifest.Type)
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}
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}
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for pName, desc := range localPlugins {
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manifest, err := ReadManifest(localGoPath, desc.ModuleName)
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if err != nil {
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return nil, fmt.Errorf("%s: failed to read manifest: %w", desc.ModuleName, err)
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}
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i := interp.New(interp.Options{GoPath: localGoPath})
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err = i.Use(stdlib.Symbols)
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if err != nil {
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return nil, fmt.Errorf("%s: failed to load symbols: %w", desc.ModuleName, err)
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}
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err = i.Use(ppSymbols())
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if err != nil {
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return nil, fmt.Errorf("%s: failed to load provider symbols: %w", desc.ModuleName, err)
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}
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_, err = i.Eval(fmt.Sprintf(`import "%s"`, manifest.Import))
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if err != nil {
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return nil, fmt.Errorf("%s: failed to import plugin code %q: %w", desc.ModuleName, manifest.Import, err)
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}
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switch manifest.Type {
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case "middleware":
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pb.middlewareDescriptors[pName] = pluginContext{
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interpreter: i,
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GoPath: localGoPath,
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Import: manifest.Import,
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BasePkg: manifest.BasePkg,
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}
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case "provider":
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pb.providerDescriptors[pName] = pluginContext{
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interpreter: i,
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GoPath: localGoPath,
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Import: manifest.Import,
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BasePkg: manifest.BasePkg,
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}
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default:
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return nil, fmt.Errorf("unknow plugin type: %s", manifest.Type)
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}
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}
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return pb, nil
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}
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