traefik/pkg/types/logs.go

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package types
import (
"fmt"
"strings"
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"github.com/containous/flaeg/parse"
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)
const (
// AccessLogKeep is the keep string value
AccessLogKeep = "keep"
// AccessLogDrop is the drop string value
AccessLogDrop = "drop"
// AccessLogRedact is the redact string value
AccessLogRedact = "redact"
)
// TraefikLog holds the configuration settings for the traefik logger.
type TraefikLog struct {
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LogLevel string `description:"Log level set to traefik logs." export:"true"`
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FilePath string `json:"file,omitempty" description:"Traefik log file path. Stdout is used when omitted or empty"`
Format string `json:"format,omitempty" description:"Traefik log format: json | common"`
}
// AccessLog holds the configuration settings for the access logger (middlewares/accesslog).
type AccessLog struct {
FilePath string `json:"file,omitempty" description:"Access log file path. Stdout is used when omitted or empty" export:"true"`
Format string `json:"format,omitempty" description:"Access log format: json | common" export:"true"`
Filters *AccessLogFilters `json:"filters,omitempty" description:"Access log filters, used to keep only specific access logs" export:"true"`
Fields *AccessLogFields `json:"fields,omitempty" description:"AccessLogFields" export:"true"`
BufferingSize int64 `json:"bufferingSize,omitempty" description:"Number of access log lines to process in a buffered way. Default 0." export:"true"`
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}
// AccessLogFilters holds filters configuration
type AccessLogFilters struct {
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StatusCodes StatusCodes `json:"statusCodes,omitempty" description:"Keep access logs with status codes in the specified range" export:"true"`
RetryAttempts bool `json:"retryAttempts,omitempty" description:"Keep access logs when at least one retry happened" export:"true"`
MinDuration parse.Duration `json:"duration,omitempty" description:"Keep access logs when request took longer than the specified duration" export:"true"`
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}
// FieldHeaders holds configuration for access log headers
type FieldHeaders struct {
DefaultMode string `json:"defaultMode,omitempty" description:"Default mode for fields: keep | drop | redact" export:"true"`
Names FieldHeaderNames `json:"names,omitempty" description:"Override mode for headers" export:"true"`
}
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// StatusCodes holds status codes ranges to filter access log
type StatusCodes []string
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// Set adds strings elem into the the parser
// it splits str on , and ;
func (s *StatusCodes) Set(str string) error {
fargs := func(c rune) bool {
return c == ',' || c == ';'
}
// get function
slice := strings.FieldsFunc(str, fargs)
*s = append(*s, slice...)
return nil
}
// Get StatusCodes
func (s *StatusCodes) Get() interface{} { return *s }
// String return slice in a string
func (s *StatusCodes) String() string { return fmt.Sprintf("%v", *s) }
// SetValue sets StatusCodes into the parser
func (s *StatusCodes) SetValue(val interface{}) {
*s = val.(StatusCodes)
}
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// FieldNames holds maps of fields with specific mode
type FieldNames map[string]string
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// String is the method to format the flag's value, part of the flag.Value interface.
// The String method's output will be used in diagnostics.
func (f *FieldNames) String() string {
return fmt.Sprintf("%+v", *f)
}
// Get return the FieldNames map
func (f *FieldNames) Get() interface{} {
return *f
}
// Set is the method to set the flag value, part of the flag.Value interface.
// Set's argument is a string to be parsed to set the flag.
// It's a space-separated list, so we split it.
func (f *FieldNames) Set(value string) error {
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// When arguments are passed through YAML, escaped double quotes
// might be added to this string, and they would break the last
// key/value pair. This ensures the string is clean.
value = strings.Trim(value, "\"")
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fields := strings.Fields(value)
for _, field := range fields {
n := strings.SplitN(field, "=", 2)
if len(n) == 2 {
(*f)[n[0]] = n[1]
}
}
return nil
}
// SetValue sets the FieldNames map with val
func (f *FieldNames) SetValue(val interface{}) {
*f = val.(FieldNames)
}
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// FieldHeaderNames holds maps of fields with specific mode
type FieldHeaderNames map[string]string
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// String is the method to format the flag's value, part of the flag.Value interface.
// The String method's output will be used in diagnostics.
func (f *FieldHeaderNames) String() string {
return fmt.Sprintf("%+v", *f)
}
// Get return the FieldHeaderNames map
func (f *FieldHeaderNames) Get() interface{} {
return *f
}
// Set is the method to set the flag value, part of the flag.Value interface.
// Set's argument is a string to be parsed to set the flag.
// It's a space-separated list, so we split it.
func (f *FieldHeaderNames) Set(value string) error {
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// When arguments are passed through YAML, escaped double quotes
// might be added to this string, and they would break the last
// key/value pair. This ensures the string is clean.
value = strings.Trim(value, "\"")
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fields := strings.Fields(value)
for _, field := range fields {
n := strings.SplitN(field, "=", 2)
(*f)[n[0]] = n[1]
}
return nil
}
// SetValue sets the FieldHeaderNames map with val
func (f *FieldHeaderNames) SetValue(val interface{}) {
*f = val.(FieldHeaderNames)
}
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// AccessLogFields holds configuration for access log fields
type AccessLogFields struct {
DefaultMode string `json:"defaultMode,omitempty" description:"Default mode for fields: keep | drop" export:"true"`
Names FieldNames `json:"names,omitempty" description:"Override mode for fields" export:"true"`
Headers *FieldHeaders `json:"headers,omitempty" description:"Headers to keep, drop or redact" export:"true"`
}
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// Keep check if the field need to be kept or dropped
func (f *AccessLogFields) Keep(field string) bool {
defaultKeep := true
if f != nil {
defaultKeep = checkFieldValue(f.DefaultMode, defaultKeep)
if v, ok := f.Names[field]; ok {
return checkFieldValue(v, defaultKeep)
}
}
return defaultKeep
}
// KeepHeader checks if the headers need to be kept, dropped or redacted and returns the status
func (f *AccessLogFields) KeepHeader(header string) string {
defaultValue := AccessLogKeep
if f != nil && f.Headers != nil {
defaultValue = checkFieldHeaderValue(f.Headers.DefaultMode, defaultValue)
if v, ok := f.Headers.Names[header]; ok {
return checkFieldHeaderValue(v, defaultValue)
}
}
return defaultValue
}
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func checkFieldValue(value string, defaultKeep bool) bool {
switch value {
case AccessLogKeep:
return true
case AccessLogDrop:
return false
default:
return defaultKeep
}
}
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func checkFieldHeaderValue(value string, defaultValue string) string {
if value == AccessLogKeep || value == AccessLogDrop || value == AccessLogRedact {
return value
}
return defaultValue
}