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outputhelpers.go
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/
outputhelpers.go
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// Copyright 2022-2023 The Inspektor Gadget authors
//
// Licensed 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 parser
import (
"encoding/json"
"github.com/inspektor-gadget/inspektor-gadget/pkg/columns/formatter/textcolumns"
"github.com/inspektor-gadget/inspektor-gadget/pkg/logger"
"github.com/inspektor-gadget/inspektor-gadget/pkg/types"
)
// TextColumnsFormatter is the interface used for outputHelper
type TextColumnsFormatter interface {
FormatHeader() string
SetShowColumns([]string) error
TransformEvent(string) (string, error)
EventHandlerFunc() any
EventHandlerFuncArray(...func()) any
SetEventCallback(eventCallback func(string))
SetEnableExtraLines(bool)
}
type ExtraLines interface {
ExtraLines() []string
}
type ErrorGetter interface {
GetType() types.EventType
GetMessage() string
}
// outputHelpers hides all information about underlying types from the application
type outputHelper[T any] struct {
parser *parser[T]
*textcolumns.TextColumnsFormatter[T]
eventCallback func(string)
enableExtraLines bool
}
func (oh *outputHelper[T]) forwardEvent(ev *T) {
oh.eventCallback(oh.TextColumnsFormatter.FormatEntry(ev))
if !oh.enableExtraLines {
return
}
// Output extra lines if the events support this
for _, line := range any(ev).(ExtraLines).ExtraLines() {
oh.eventCallback(line)
}
}
func (oh *outputHelper[T]) EventHandlerFunc() any {
if oh.eventCallback == nil {
panic("set event callback before getting the EventHandlerFunc from TextColumnsFormatter")
}
return func(ev *T) {
if getter, ok := any(ev).(ErrorGetter); ok {
switch getter.GetType() {
case types.ERR:
oh.parser.writeLogMessage(logger.ErrorLevel, getter.GetMessage())
return
case types.WARN:
oh.parser.writeLogMessage(logger.WarnLevel, getter.GetMessage())
return
case types.DEBUG:
oh.parser.writeLogMessage(logger.DebugLevel, getter.GetMessage())
return
case types.INFO:
oh.parser.writeLogMessage(logger.InfoLevel, getter.GetMessage())
return
}
}
oh.forwardEvent(ev)
}
}
func (oh *outputHelper[T]) EventHandlerFuncArray(headerFuncs ...func()) any {
if oh.eventCallback == nil {
panic("set event callback before getting the EventHandlerFunc from TextColumnsFormatter")
}
return func(events []*T) {
for _, hf := range headerFuncs {
hf()
}
for _, ev := range events {
oh.forwardEvent(ev)
}
}
}
func (oh *outputHelper[T]) SetEventCallback(eventCallback func(string)) {
oh.eventCallback = eventCallback
}
// TransformEvent takes a JSON encoded line and transforms it to columns view
func (oh *outputHelper[T]) TransformEvent(line string) (string, error) {
ev := new(T)
err := json.Unmarshal([]byte(line), &ev)
if err != nil {
return "", err
}
// Apply filters
if oh.parser.filterSpecs != nil && !oh.parser.filterSpecs.MatchAll(ev) {
return "", nil
}
return oh.FormatEntry(ev), nil
}
func (oh *outputHelper[T]) SetShowColumns(cols []string) error {
return oh.TextColumnsFormatter.SetShowColumns(cols)
}
func (oh *outputHelper[T]) SetEnableExtraLines(newVal bool) {
// Check, whether the type actually supports extra lines
if _, ok := any(new(T)).(ExtraLines); !ok {
return
}
oh.enableExtraLines = newVal
}