53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
// Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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package lambda
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import (
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"fmt"
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"log"
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"net"
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"net/rpc"
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"os"
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)
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// Start takes a handler, and talks to and internal Lambda endpoint to pass Invoke requests to the handler. If a
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// handler does not match one of the supported types, the lambda package will respond to new invokes served by in
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// internal endpoint with an appropriate error message. Start blocks, and does not return after being called.
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//
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// Rules:
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// * handler must be a function
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// * handler may take between 0 and two arguments.
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// * If there are two arguments, the first argument must implement "context.Context".
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// * handler may return between 0 and two arguments.
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// * If there are two return values, the second argument must implement "error".
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// * If there is one return value it must implement "error".
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//
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// func ()
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// func () error
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// func (TIn) error
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// func () (TOut, error)
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// func (TIn) (TOut, error)
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// func (context.Context) error
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// func (context.Context, TIn) error
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// func (context.Context) (TOut, error)
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// func (context.Context, TIn) (TOut, error)
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//
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// Where '''TIn''' and '''TOut''' are types compatible with the ''encoding/json'' standard library.
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// See https://golang.org/pkg/encoding/json/#Unmarshal for how deserialization behaves
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func Start(handler interface{}) {
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port := os.Getenv("_LAMBDA_SERVER_PORT")
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lis, err := net.Listen("tcp", fmt.Sprintf("localhost:%s", port))
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if err != nil {
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log.Fatal(err)
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}
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wrappedHandler := newHandler(handler)
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function := new(Function)
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function.handler = wrappedHandler
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err = rpc.Register(function)
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if err != nil {
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log.Fatal("failed to register handler function")
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}
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rpc.Accept(lis)
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log.Fatal("accept should not have returned")
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}
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