Genkit MCP
Official
by firebase
// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package prompt
import (
"context"
"github.com/firebase/genkit/go/ai"
)
// RenderSystemPrompt renders a system prompt message.
// It uses config.SystemFn (if present) or config.System as a template, renders it with input,
// and appends the result as a system message to the messages slice.
// Returns the updated messages and any rendering errors.
func RenderSystemPrompt(ctx context.Context, config *Config, messages []*ai.Message, input map[string]any, raw any) ([]*ai.Message, error) {
var templateText string
var err error
if config.SystemFn != nil {
templateText, err = config.SystemFn(ctx, raw)
if err != nil {
return nil, err
}
} else if config.System != "" {
templateText = config.System
}
rendered, err := renderDotprompt(templateText, input, config.DefaultInput)
if err != nil {
return nil, err
}
if rendered != "" {
messages = append(messages, &ai.Message{
Role: ai.RoleSystem,
Content: []*ai.Part{ai.NewTextPart(rendered)},
})
}
return messages, nil
}
// RenderUserPrompt renders a user prompt message.
// It uses config.PromptFn (if present) or config.Prompt as a template, renders it with input,
// and appends the result as a user message to the messages slice.
// Returns the updated messages and any rendering errors.
func RenderUserPrompt(ctx context.Context, config *Config, messages []*ai.Message, input map[string]any, raw any) ([]*ai.Message, error) {
var templateText string
var err error
if config.PromptFn != nil {
templateText, err = config.PromptFn(ctx, raw)
if err != nil {
return nil, err
}
} else if config.Prompt != "" {
templateText = config.Prompt
}
rendered, err := renderDotprompt(templateText, input, config.DefaultInput)
if err != nil {
return nil, err
}
if rendered != "" {
messages = append(messages, &ai.Message{
Role: ai.RoleUser,
Content: []*ai.Part{ai.NewTextPart(rendered)},
})
}
return messages, nil
}
// RenderMessages renders a slice of messages.
// It uses config.MessagesFn (if present) or config.Messages as a template, renders e with input,
// and appends the result to the messages slice.
// Returns the updated messages and any rendering errors.
func RenderMessages(ctx context.Context, config *Config, messages []*ai.Message, input map[string]any, raw any) ([]*ai.Message, error) {
var msgs []*ai.Message
var err error
if config.MessagesFn != nil {
msgs, err = config.MessagesFn(ctx, raw)
if err != nil {
return nil, err
}
} else if len(config.Messages) > 0 {
msgs = config.Messages
}
for _, msg := range msgs {
for _, part := range msg.Content {
if part.IsText() {
rendered, err := renderDotprompt(part.Text, input, config.DefaultInput)
if err != nil {
return nil, err
}
msg.Content[0].Text = rendered
}
}
}
return append(messages, msgs...), nil
}