90 lines
3.0 KiB
Go
90 lines
3.0 KiB
Go
// Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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//
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// Helpers for accessing context information from an Invoke request. Context information
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// is stored in a https://golang.org/pkg/context/#Context. The functions FromContext and NewContext
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// are used to retrieving and inserting an isntance of LambdaContext.
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package lambdacontext
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import (
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"context"
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"os"
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"strconv"
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)
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// LogGroupName is the name of the log group that contains the log streams of the current Lambda Function
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var LogGroupName string
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// LogStreamName name of the log stream that the current Lambda Function's logs will be sent to
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var LogStreamName string
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// FunctionName the name of the current Lambda Function
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var FunctionName string
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// MemoryLimitInMB is the configured memory limit for the current instance of the Lambda Function
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var MemoryLimitInMB int
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// FunctionVersion is the published version of the current instance of the Lambda Function
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var FunctionVersion string
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func init() {
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LogGroupName = os.Getenv("AWS_LAMBDA_LOG_GROUP_NAME")
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LogStreamName = os.Getenv("AWS_LAMBDA_LOG_STREAM_NAME")
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FunctionName = os.Getenv("AWS_LAMBDA_FUNCTION_NAME")
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if limit, err := strconv.Atoi(os.Getenv("AWS_LAMBDA_FUNCTION_MEMORY_SIZE")); err != nil {
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MemoryLimitInMB = 0
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} else {
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MemoryLimitInMB = limit
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}
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FunctionVersion = os.Getenv("AWS_LAMBDA_FUNCTION_VERSION")
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}
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// ClientApplication is metadata about the calling application.
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type ClientApplication struct {
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InstallationID string `json:"installation_id"`
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AppTitle string `json:"app_title"`
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AppVersionCode string `json:"app_version_code"`
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AppPackageName string `json:"app_package_name"`
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}
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// ClientContext is information about the client application passed by the calling application.
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type ClientContext struct {
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Client ClientApplication
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Env map[string]string `json:"env"`
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Custom map[string]string `json:"custom"`
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}
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// CognitoIdentity is the cognito identity used by the calling application.
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type CognitoIdentity struct {
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CognitoIdentityID string
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CognitoIdentityPoolID string
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}
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// LambdaContext is the set of metadata that is passed for every Invoke.
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type LambdaContext struct {
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AwsRequestID string
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InvokedFunctionArn string
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Identity CognitoIdentity
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ClientContext ClientContext
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}
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// An unexported type to be used as the key for types in this package.
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// This prevents collisions with keys defined in other packages.
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type key struct{}
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// The key for a LambdaContext in Contexts.
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// Users of this package must use lambdacontext.NewContext and lambdacontext.FromContext
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// instead of using this key directly.
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var contextKey = &key{}
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// NewContext returns a new Context that carries value lc.
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func NewContext(parent context.Context, lc *LambdaContext) context.Context {
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return context.WithValue(parent, contextKey, lc)
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}
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// FromContext returns the LambdaContext value stored in ctx, if any.
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func FromContext(ctx context.Context) (*LambdaContext, bool) {
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lc, ok := ctx.Value(contextKey).(*LambdaContext)
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return lc, ok
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}
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