golang源码分析：langchaingo（1）

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package main
import (
    "context"
    "fmt"
    "log"
    "github.com/tmc/langchaingo/llms"
    "github.com/tmc/langchaingo/llms/openai"
)
func main() {
    ctx := context.Background()
    llm, err := openai.New()
    if err != nil {
        log.Fatal(err)
    }
    prompt := "What would be a good company name for a company that makes colorful socks?"
    completion, err := llms.GenerateFromSinglePrompt(ctx, llm, prompt)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(completion)
}

llm, err := openai.New()

completion, err := llms.GenerateFromSinglePrompt(ctx, llm, prompt)

func New(opts ...Option) (*LLM, error) {
    opt, c, err := newClient(opts...)
    if err != nil {
        return nil, err
    }
    return &LLM{
        client:           c,
        CallbacksHandler: opt.callbackHandler,
    }, err
}

func newClient(opts ...Option) (*options, *openaiclient.Client, error) {
    options := &options{
        token:        os.Getenv(tokenEnvVarName),
        model:        os.Getenv(modelEnvVarName),
        baseURL:      getEnvs(baseURLEnvVarName, baseAPIBaseEnvVarName),
        organization: os.Getenv(organizationEnvVarName),
        apiType:      APIType(openaiclient.APITypeOpenAI),
        httpClient:   http.DefaultClient,
    }
    for _, opt := range opts {
        opt(options)
    }
    // set of options needed for Azure client
    if openaiclient.IsAzure(openaiclient.APIType(options.apiType)) && options.apiVersion == "" {
        options.apiVersion = DefaultAPIVersion
        if options.model == "" {
            return options, nil, ErrMissingAzureModel
        }
        if options.embeddingModel == "" {
            return options, nil, ErrMissingAzureEmbeddingModel
        }
    }
    if len(options.token) == 0 {
        return options, nil, ErrMissingToken
    }
    cli, err := openaiclient.New(options.token, options.model, options.baseURL, options.organization,
        openaiclient.APIType(options.apiType), options.apiVersion, options.httpClient, options.embeddingModel,
        options.responseFormat,
    )
    return options, cli, err
}

openaiclient.New(options.token, options.model, options.baseURL, options.organization,
        openaiclient.APIType(options.apiType), options.apiVersion, options.httpClient, options.embeddingModel,
        options.responseFormat,
    )

func New(token string, model string, baseURL string, organization string,
    apiType APIType, apiVersion string, httpClient Doer, embeddingModel string,
    responseFormat *ResponseFormat,
    opts ...Option,
) (*Client, error) {
    c := &Client{
        token:          token,
        Model:          model,
        EmbeddingModel: embeddingModel,
        baseURL:        strings.TrimSuffix(baseURL, "/"),
        organization:   organization,
        apiType:        apiType,
        apiVersion:     apiVersion,
        httpClient:     httpClient,
        ResponseFormat: responseFormat,
    }
    if c.baseURL == "" {
        c.baseURL = defaultBaseURL
    }
    for _, opt := range opts {
        if err := opt(c); err != nil {
            return nil, err
        }
    }
    return c, nil
}