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96 lines
3.3 KiB
Go
96 lines
3.3 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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"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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// demonstrates the field mapping ability of eino workflow.
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func main() {
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type counter struct {
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FullStr string // exported because we will do field mapping for this field
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SubStr string // exported because we will do field mapping for this field
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}
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// wordCounter is a lambda function that count occurrences of SubStr within FullStr
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wordCounter := func(ctx context.Context, c counter) (int, error) {
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return strings.Count(c.FullStr, c.SubStr), nil
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}
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type message struct {
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*schema.Message // exported because we will do field mapping for this field
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SubStr string // exported because we will do field mapping for this field
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}
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// create a workflow just like a Graph
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wf := compose.NewWorkflow[message, map[string]any]()
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// add lambda c1 just like in Graph
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wf.AddLambdaNode("c1", compose.InvokableLambda(wordCounter)).
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AddInput(compose.START, // add an input from START, specifying 2 field mappings
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// map START's SubStr field to lambda c1's SubStr field
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compose.MapFields("SubStr", "SubStr"),
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// map START's Message's Content field to lambda c1's FullStr field
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compose.MapFieldPaths([]string{"Message", "Content"}, []string{"FullStr"}))
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// add lambda c2 just like in Graph
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wf.AddLambdaNode("c2", compose.InvokableLambda(wordCounter)).
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AddInput(compose.START, // add an input from START, specifying 2 field mappings
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// map START's SubStr field to lambda c1's SubStr field
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compose.MapFields("SubStr", "SubStr"),
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// map START's Message's ReasoningContent field to lambda c1's FullStr field
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compose.MapFieldPaths([]string{"Message", "ReasoningContent"}, []string{"FullStr"}))
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wf.End(). // Obtain the compose.END for method chaining
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// add an input from c1,
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// mapping full output of c1 to the map key 'content_count'
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AddInput("c1", compose.ToField("content_count")).
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// also add an input from c2,
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// mapping full output of c2 to the map key 'reasoning_content_count'
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AddInput("c2", compose.ToField("reasoning_content_count"))
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// compile the workflow just like compiling a Graph
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run, err := wf.Compile(context.Background())
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if err != nil {
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logs.Errorf("workflow compile error: %v", err)
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return
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}
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// invoke the workflow just like invoking a Graph
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result, err := run.Invoke(context.Background(), message{
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Message: &schema.Message{
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Role: schema.Assistant,
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Content: "Hello world!",
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ReasoningContent: "I need to say something meaningful",
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},
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SubStr: "o", // would like to count the occurrences of 'o'
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})
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if err != nil {
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logs.Errorf("workflow run err: %v", err)
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return
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}
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logs.Infof("%v", result)
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}
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