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109 lines
3.0 KiB
Go
109 lines
3.0 KiB
Go
/*
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* Copyright 2025 CloudWeGo Authors
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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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*/
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package main
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import (
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"context"
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"errors"
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"io"
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"strings"
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"github.com/cloudwego/eino/compose"
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"github.com/cloudwego/eino/schema"
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"github.com/cloudwego/eino-examples/internal/logs"
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)
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// This example demonstrates an async lambda node inside an Eino graph.
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// Scenario 1: Background report generation (invokable).
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// Scenario 2: Live transcription stream (streamable) with conversion.
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func main() {
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ctx := context.Background()
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g := compose.NewGraph[string, string]()
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// async_invokable: starts a long-running job and waits on a channel.
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inv := compose.InvokableLambda(func(ctx context.Context, in string) (string, error) {
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notify := make(chan reportResult, 1)
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logs.Infof("async_invokable: start report job with input=%q", in)
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go generateReport(ctx, in, notify)
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logs.Infof("async_invokable: waiting on reportResult notification")
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select {
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case r := <-notify:
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return r.url, r.err
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case <-ctx.Done():
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return "", ctx.Err()
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}
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})
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// async_streamable: consumes a live stream and converts tokens.
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str := compose.StreamableLambda(func(ctx context.Context, in string) (*schema.StreamReader[string], error) {
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logs.Infof("async_streamable: start transcription stream with input=%q", in)
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upstream := transcribeLive(ctx, in)
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converted := schema.StreamReaderWithConvert(upstream, func(tok string) (string, error) {
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if tok == "" {
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return tok, errors.New("empty token")
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}
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return strings.ToUpper(tok), nil
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})
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logs.Infof("async_streamable: waiting on upstream tokens via StreamReaderWithConvert")
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return converted, nil
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})
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_ = g.AddLambdaNode("async_invokable", inv)
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_ = g.AddLambdaNode("async_streamable", str)
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_ = g.AddEdge(compose.START, "async_invokable")
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_ = g.AddEdge("async_invokable", "async_streamable")
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_ = g.AddEdge("async_streamable", compose.END)
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run, err := g.Compile(ctx)
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if err != nil {
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logs.Errorf("compile error: %v", err)
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return
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}
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// Invoke: "generate report" path
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out, err := run.Invoke(ctx, "Quarterly Sales Report")
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if err != nil {
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logs.Errorf("invoke error: %v", err)
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} else {
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logs.Infof("report url: %s", out)
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}
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// Stream: "transcription" path
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stream, err := run.Stream(ctx, "hello world from async node")
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if err != nil {
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logs.Errorf("stream error: %v", err)
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return
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}
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for {
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chunk, err := stream.Recv()
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if err != nil {
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if errors.Is(err, io.EOF) {
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break
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}
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logs.Tokenf("recv error: %v", err)
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break
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}
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logs.Tokenf("%s", chunk)
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}
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stream.Close()
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}
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