120 lines
3.0 KiB
Go
120 lines
3.0 KiB
Go
// Copyright 2023 The casbin Authors. All Rights Reserved.
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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 model
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"strings"
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"github.com/sashabaranov/go-openai"
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)
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type LocalModelProvider struct {
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subType string
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secretKey string
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temperature float32
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topP float32
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frequencyPenalty float32
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presencePenalty float32
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providerUrl string
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}
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func NewLocalModelProvider(subType string, secretKey string, temperature float32, topP float32, frequencyPenalty float32, presencePenalty float32, providerUrl string) (*LocalModelProvider, error) {
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p := &LocalModelProvider{
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subType: subType,
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secretKey: secretKey,
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temperature: temperature,
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topP: topP,
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frequencyPenalty: frequencyPenalty,
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presencePenalty: presencePenalty,
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providerUrl: providerUrl,
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}
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return p, nil
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}
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func getLocalClientFromUrl(authToken string, url string) *openai.Client {
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config := openai.DefaultConfig(authToken)
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config.BaseURL = url
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c := openai.NewClientWithConfig(config)
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return c
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}
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func (p *LocalModelProvider) QueryText(question string, writer io.Writer, builder *strings.Builder) error {
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client := getLocalClientFromUrl(p.secretKey, p.providerUrl)
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ctx := context.Background()
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flusher, ok := writer.(http.Flusher)
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if !ok {
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return fmt.Errorf("writer does not implement http.Flusher")
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}
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model := p.subType
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temperature := p.temperature
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topP := p.topP
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frequencyPenalty := p.frequencyPenalty
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presencePenalty := p.presencePenalty
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respStream, err := client.CreateCompletionStream(
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ctx,
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openai.CompletionRequest{
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Model: model,
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Prompt: question,
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Stream: true,
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Temperature: temperature,
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TopP: topP,
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FrequencyPenalty: frequencyPenalty,
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PresencePenalty: presencePenalty,
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},
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)
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if err != nil {
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return err
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}
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defer respStream.Close()
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isLeadingReturn := true
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for {
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completion, streamErr := respStream.Recv()
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if streamErr != nil {
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if streamErr == io.EOF {
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break
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}
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return streamErr
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}
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data := completion.Choices[0].Text
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if isLeadingReturn && len(data) != 0 {
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if strings.Count(data, "\n") == len(data) {
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continue
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} else {
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isLeadingReturn = false
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}
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}
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// Write the streamed data as Server-Sent Events
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if _, err = fmt.Fprintf(writer, "event: message\ndata: %s\n\n", data); err != nil {
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return err
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}
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flusher.Flush()
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// Append the response to the strings.Builder
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builder.WriteString(data)
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}
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return nil
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}
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