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functionlogs.go
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functionlogs.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package logsapi
import (
"go.elastic.co/apm/v2/model"
"go.elastic.co/fastjson"
)
type logContainer struct {
Log *logLine
}
type logLine struct {
Timestamp model.Time
Message string
FAAS *faas
}
func (l *logLine) MarshalFastJSON(w *fastjson.Writer) error {
var firstErr error
w.RawString("{\"message\":")
w.String(l.Message)
w.RawString(",\"@timestamp\":")
if err := l.Timestamp.MarshalFastJSON(w); err != nil && firstErr == nil {
firstErr = err
}
if l.FAAS != nil {
w.RawString(",\"faas\":")
if err := l.FAAS.MarshalFastJSON(w); err != nil && firstErr == nil {
firstErr = err
}
}
w.RawByte('}')
return firstErr
}
// faas struct is a subset of go.elastic.co/apm/v2/model#FAAS
//
// The purpose of having a separate struct is to have a custom
// marshalling logic that is targeted for the faas fields
// available for function logs. For example: `coldstart` value
// cannot be inferred for function logs so this struct drops
// the field entirely.
type faas struct {
// ID holds a unique identifier of the invoked serverless function.
ID string `json:"id,omitempty"`
// Execution holds the request ID of the function invocation.
Execution string `json:"execution,omitempty"`
}
func (f *faas) MarshalFastJSON(w *fastjson.Writer) error {
w.RawString("{\"id\":")
w.String(f.ID)
w.RawString(",\"execution\":")
w.String(f.Execution)
w.RawByte('}')
return nil
}
func (lc logContainer) MarshalFastJSON(json *fastjson.Writer) error {
json.RawString(`{"log":`)
if err := lc.Log.MarshalFastJSON(json); err != nil {
return err
}
json.RawByte('}')
return nil
}
// ProcessFunctionLog processes the `function` log line from lambda logs API and returns
// a byte array containing the JSON body for the extracted log along with the timestamp.
// A non nil error is returned when marshaling of the log into JSON fails.
func ProcessFunctionLog(
requestID string,
invokedFnArn string,
log LogEvent,
) ([]byte, error) {
lc := logContainer{
Log: &logLine{
Timestamp: model.Time(log.Time),
Message: log.StringRecord,
},
}
lc.Log.FAAS = &faas{
ID: invokedFnArn,
Execution: requestID,
}
var jsonWriter fastjson.Writer
if err := lc.MarshalFastJSON(&jsonWriter); err != nil {
return nil, err
}
return jsonWriter.Bytes(), nil
}