90 lines
2.7 KiB
Go
90 lines
2.7 KiB
Go
// Copyright 2023 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package genai
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import (
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"context"
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)
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// A ChatSession provides interactive chat.
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type ChatSession struct {
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m *GenerativeModel
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History []*Content
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}
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// StartChat starts a chat session.
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func (m *GenerativeModel) StartChat() *ChatSession {
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return &ChatSession{m: m}
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}
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// SendMessage sends a request to the model as part of a chat session.
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func (cs *ChatSession) SendMessage(ctx context.Context, parts ...Part) (*GenerateContentResponse, error) {
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// Call the underlying client with the entire history plus the argument Content.
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cs.History = append(cs.History, NewUserContent(parts...))
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req, err := cs.m.newGenerateContentRequest(cs.History...)
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if err != nil {
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return nil, err
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}
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req.GenerationConfig.CandidateCount = Ptr[int32](1)
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resp, err := cs.m.generateContent(ctx, req)
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if err != nil {
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return nil, err
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}
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cs.addToHistory(resp.Candidates)
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return resp, nil
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}
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// SendMessageStream is like SendMessage, but with a streaming request.
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func (cs *ChatSession) SendMessageStream(ctx context.Context, parts ...Part) *GenerateContentResponseIterator {
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cs.History = append(cs.History, NewUserContent(parts...))
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req, err := cs.m.newGenerateContentRequest(cs.History...)
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if err != nil {
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return &GenerateContentResponseIterator{err: err}
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}
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req.GenerationConfig.CandidateCount = Ptr[int32](1)
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streamClient, err := cs.m.c.gc.StreamGenerateContent(ctx, req)
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return &GenerateContentResponseIterator{
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sc: streamClient,
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err: err,
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cs: cs,
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}
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}
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// By default, use the first candidate for history. The user can modify that if they want.
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func (cs *ChatSession) addToHistory(cands []*Candidate) bool {
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if len(cands) > 0 {
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c := cands[0].Content
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if c == nil {
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return false
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}
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c.Role = roleModel
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cs.History = append(cs.History, copySanitizedModelContent(c))
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return true
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}
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return false
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}
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// copySanitizedModelContent creates a (shallow) copy of c with role set to
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// model and empty text parts removed.
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func copySanitizedModelContent(c *Content) *Content {
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newc := &Content{Role: roleModel}
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for _, part := range c.Parts {
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if t, ok := part.(Text); !ok || len(string(t)) > 0 {
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newc.Parts = append(newc.Parts, part)
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}
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}
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return newc
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}
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