log

package
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 Go to latest Published: Feb 21, 2017 License: Apache-2.0 Imports: 31 Imported by: 0

Documentation

Overview

Package log implements logging analogous to the Google-internal C++ INFO/ERROR/V setup. It provides functions Info, Warning, Error, Fatal, plus formatting variants such as Infof. It also provides V-style logging and adaptions for use as a structured logging engine.

Basic examples: 

	log.Info("Prepare to repel boarders")

	log.Fatal("Initialization failed", err)

 // Log with context.
 log.Infoc(context, "client error: %s", err)

See the documentation for the V function for an explanation of these examples: 

if log.V(2) {
	log.Info("Starting transaction...")
}

Log output is buffered and written periodically using Flush. Programs should call Flush before exiting to guarantee all log output is written.

By default, all log statements write to files in a temporary directory. This package provides several flags that modify this behavior. These are provided via the pflags library; see InitFlags. 

--logtostderr=true
	Logs are written to standard error instead of to files.
--alsologtostderr=INFO
	Logs are written to standard error as well as to files.
--log-dir=""
	Log files will be written to this directory instead of the
	default temporary directory.

Other flags provide aids to debugging.

--log-backtrace-at=""
	When set to a file and line number holding a logging statement,
	such as
		-log_backtrace_at=gopherflakes.go:234
	a stack trace will be written to the Info log whenever execution
	hits that statement. (Unlike with --vmodule, the ".go" must be
	present.)
--verbosity=0
	Enable V-leveled logging at the specified level.
--vmodule=""
	The syntax of the argument is a comma-separated list of pattern=N,
	where pattern is a literal file name (minus the ".go" suffix) or
	"glob" pattern and N is a V level. For instance,
		-vmodule=gopher*=3
	sets the V level to 3 in all Go files whose names begin "gopher".

Package log is a generated protocol buffer package.

It is generated from these files:
	cockroach/pkg/util/log/log.proto

It has these top-level messages:
	Entry
	FileDetails
	FileInfo

Index

Constants

This section is empty.

Variables

View Source 
var (
	ErrInvalidLengthLog = fmt.Errorf("proto: negative length found during unmarshaling")
	ErrIntOverflowLog   = fmt.Errorf("proto: integer overflow")
)
View Source 
var MaxSize uint64 = 1024 * 1024 * 10

MaxSize is the maximum size of a log file in bytes.

View Source 
var MaxSizePerSeverity = MaxSize * 10

MaxSizePerSeverity is the maximum total size in bytes for log files per severity. Note that this is only checked when log files are created, so the total size of log files per severity might temporarily be up to MaxSize larger.

View Source 
var Severity_name = map[int32]string{
	0: "UNKNOWN",
	1: "INFO",
	2: "WARNING",
	3: "ERROR",
	4: "FATAL",
	5: "NONE",
}
View Source 
var Severity_value = map[string]int32{
	"UNKNOWN": 0,
	"INFO":    1,
	"WARNING": 2,
	"ERROR":   3,
	"FATAL":   4,
	"NONE":    5,
}
View Source 
var Stats struct {
	Info, Warning, Error outputStats
}

Stats tracks the number of lines of output and number of bytes per severity level. Values must be read with atomic.LoadInt64.

Functions

func DirSet 

func DirSet() bool

DirSet returns true of the log directory has been changed from its default.

func ErrEvent 

func ErrEvent(ctx context.Context, msg string)

ErrEvent looks for an opentracing.Trace in the context and logs the given message to it. If no Trace is found, it looks for an EventLog in the context and logs the message to it (as an error). If neither is found, does nothing.

func ErrEventf 

func ErrEventf(ctx context.Context, format string, args ...interface{})

ErrEventf looks for an opentracing.Trace in the context and formats and logs the given message to it. If no Trace is found, it looks for an EventLog in the context and formats and logs the message to it (as an error). If neither is found, does nothing.

func Error 

func Error(ctx context.Context, args ...interface{})

Error logs to the ERROR, WARNING, and INFO logs. It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Print; a newline is appended.

func Errorf 

func Errorf(ctx context.Context, format string, args ...interface{})

Errorf logs to the ERROR, WARNING, and INFO logs. It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Printf; a newline is appended.

func ErrorfDepth 

func ErrorfDepth(ctx context.Context, depth int, format string, args ...interface{})

ErrorfDepth logs to the ERROR, WARNING, and INFO logs, offsetting the caller's stack frame by 'depth'. It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Printf; a newline is appended.

func Event 

func Event(ctx context.Context, msg string)

Event looks for an opentracing.Trace in the context and logs the given message to it. If no Trace is found, it looks for an EventLog in the context and logs the message to it. If neither is found, does nothing.

func Eventf 

func Eventf(ctx context.Context, format string, args ...interface{})

Eventf looks for an opentracing.Trace in the context and formats and logs the given message to it. If no Trace is found, it looks for an EventLog in the context and logs the message to it. If neither is found, does nothing.

func Fatal 

func Fatal(ctx context.Context, args ...interface{})

Fatal logs to the INFO, WARNING, ERROR, and FATAL logs, including a stack trace of all running goroutines, then calls os.Exit(255). It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Print; a newline is appended.

func FatalOnPanic 

func FatalOnPanic()

FatalOnPanic recovers from a panic and exits the process with a Fatal log. This is useful for avoiding a panic being caught through a CGo exported function or preventing HTTP handlers from recovering panics and ignoring them.

func Fatalf 

func Fatalf(ctx context.Context, format string, args ...interface{})

Fatalf logs to the INFO, WARNING, ERROR, and FATAL logs, including a stack trace of all running goroutines, then calls os.Exit(255). It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Printf; a newline is appended.

func FatalfDepth 

func FatalfDepth(ctx context.Context, depth int, format string, args ...interface{})

FatalfDepth logs to the INFO, WARNING, ERROR, and FATAL logs (offsetting the caller's stack frame by 'depth'), including a stack trace of all running goroutines, then calls os.Exit(255). It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Printf; a newline is appended.

func FinishEventLog 

func FinishEventLog(ctx context.Context)

FinishEventLog closes the event log in the context (see WithEventLog). Concurrent and subsequent calls to record events are allowed.

func Flush 

func Flush()

Flush flushes all pending log I/O.

func GetLogReader 

func GetLogReader(filename string, restricted bool) (io.ReadCloser, error)

GetLogReader returns a reader for the specified filename. In restricted mode, the filename must be the base name of a file in this process's log directory (this is safe for cases when the filename comes from external sources, such as the admin UI via HTTP). In unrestricted mode any path is allowed, relative to the current directory, with the added feature that simple (base name) file names will be searched in this process's log directory if not found in the current directory.

func HasSpanOrEvent 

func HasSpanOrEvent(ctx context.Context) bool

HasSpanOrEvent returns true if the context has a span or event that should be logged to.

func Info 

func Info(ctx context.Context, args ...interface{})

Info logs to the INFO log. It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Print; a newline is appended.

func Infof 

func Infof(ctx context.Context, format string, args ...interface{})

Infof logs to the INFO log. It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Printf; a newline is appended.

func InfofDepth 

func InfofDepth(ctx context.Context, depth int, format string, args ...interface{})

InfofDepth logs to the INFO log, offsetting the caller's stack frame by 'depth'. It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Printf; a newline is appended.

func NewStdLogger 

func NewStdLogger(severity Severity) *stdLog.Logger

NewStdLogger creates a *stdLog.Logger that forwards messages to the Google logs for the specified severity.

func SetExitFunc 

func SetExitFunc(f func(int))

SetExitFunc allows setting a function that will be called to exit the process when a Fatal message is generated.

func V 

func V(level level) bool

V returns true if the logging verbosity is set to the specified level or higher.

func VDepth 

func VDepth(level level, depth int) bool

VDepth reports whether verbosity at the call site is at least the requested level.

func VEvent 

func VEvent(ctx context.Context, level level, msg string)

VEvent either logs a message to the log files (which also outputs to the active trace or event log) or to the trace/event log alone, depending on whether the specified verbosity level is active.

func VEventf 

func VEventf(ctx context.Context, level level, format string, args ...interface{})

VEventf either logs a message to the log files (which also outputs to the active trace or event log) or to the trace/event log alone, depending on whether the specified verbosity level is active.

func Warning 

func Warning(ctx context.Context, args ...interface{})

Warning logs to the WARNING and INFO logs. It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Print; a newline is appended.

func Warningf 

func Warningf(ctx context.Context, format string, args ...interface{})

Warningf logs to the WARNING and INFO logs. It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Printf; a newline is appended.

func WarningfDepth 

func WarningfDepth(ctx context.Context, depth int, format string, args ...interface{})

WarningfDepth logs to the WARNING and INFO logs, offsetting the caller's stack frame by 'depth'. It extracts log tags from the context and logs them along with the given message. Arguments are handled in the manner of fmt.Printf; a newline is appended.

func WithEventLog 

func WithEventLog(ctx context.Context, family, title string) context.Context

WithEventLog creates and embeds a trace.EventLog in the context, causing future logging and event calls to go to the EventLog. The current context must not have an existing open span.

func WithLogTag 

func WithLogTag(ctx context.Context, name string, value interface{}) context.Context

WithLogTag returns a context (derived from the given context) which when used with a logging function results in the given name and value being printed in the message.

The value is stored and passed to fmt.Fprint when the log message is constructed. A fmt.Stringer can be passed which allows the value to be "dynamic".

If the value is nil, just the name shows up.

func WithLogTagInt 

func WithLogTagInt(ctx context.Context, name string, value int) context.Context

WithLogTagInt is a variant of WithLogTag that avoids the allocation associated with boxing the value in an interface{}.

func WithLogTagInt64 

func WithLogTagInt64(ctx context.Context, name string, value int64) context.Context

WithLogTagInt64 is a variant of WithLogTag that avoids the allocation associated with boxing the value in an interface{}.

func WithLogTagStr 

func WithLogTagStr(ctx context.Context, name string, value string) context.Context

WithLogTagStr is a variant of WithLogTag that avoids the allocation associated with boxing the value in an interface{}.

func WithNoEventLog 

func WithNoEventLog(ctx context.Context) context.Context

WithNoEventLog creates a context which no longer has an embedded event log.

Types

type AmbientContext 

type AmbientContext struct {
	// Tracer is used to open spans (see AnnotateCtxWithSpan).
	Tracer opentracing.Tracer
	// contains filtered or unexported fields
}

AmbientContext is a helper type used to "annotate" context.Contexts with log tags and a Tracer or EventLog. It is intended to be embedded into various server components.

Example: 

type SomeServer struct {
  log.AmbientContext
  ...
}

ac := AmbientContext{Tracer: tracing.NewTracer()}
ac.AddLogTag("n", 1)

s := &SomeServer{
  AmbientContext: ac
  ...
}

// on an operation with context ctx
ctx = s.AnnotateCtx(ctx)
...

// run a worker
s.stopper.RunWorker(func() {
  ctx := s.AnnotateCtx(context.Background())
  ...
})

// start a background operation
ctx, span := s.AnnotateCtxWithSpan(context.Background(), "some-op")
defer span.Finish()
...

func (*AmbientContext) AddLogTag 

func (ac *AmbientContext) AddLogTag(name string, value interface{})

AddLogTag adds a tag; see WithLogTag.

func (*AmbientContext) AddLogTagInt 

func (ac *AmbientContext) AddLogTagInt(name string, value int)

AddLogTagInt adds an integer tag; see WithLogTagInt.

func (*AmbientContext) AddLogTagInt64 

func (ac *AmbientContext) AddLogTagInt64(name string, value int64)

AddLogTagInt64 adds an integer tag; see WithLogTagInt64.

func (*AmbientContext) AddLogTagStr 

func (ac *AmbientContext) AddLogTagStr(name string, value string)

AddLogTagStr adds a string tag; see WithLogTagStr.

func (*AmbientContext) AnnotateCtx 

func (ac *AmbientContext) AnnotateCtx(ctx context.Context) context.Context

AnnotateCtx annotates a given context with the information in AmbientContext:

  • the EventLog is embedded in the context if the context doesn't already have en event log or an open trace.
  • the log tags in AmbientContext are added (if ctx doesn't already have them). If the tags already exist, the values from the AmbientContext overwrite the existing values, but the order of the tags might change.

For background operations, context.Background() should be passed; however, in that case it is strongly recommended to open a span if possible (using AnnotateCtxWithSpan).

func (*AmbientContext) AnnotateCtxWithSpan 

func (ac *AmbientContext) AnnotateCtxWithSpan(
	ctx context.Context, opName string,
) (context.Context, opentracing.Span)

AnnotateCtxWithSpan annotates the given context with the information in AmbientContext (see AnnotateCtx) and opens a span.

If the given context has a span, the new span is a child of that span. Otherwise, the Tracer in AmbientContext is used to create a new root span.

The caller is responsible for closing the span (via Span.Finish).

func (*AmbientContext) FinishEventLog 

func (ac *AmbientContext) FinishEventLog()

FinishEventLog closes the event log. Concurrent and subsequent calls to record events from contexts that use this event log embedded are allowed.

func (*AmbientContext) ResetAndAnnotateCtx 

func (ac *AmbientContext) ResetAndAnnotateCtx(ctx context.Context) context.Context

ResetAndAnnotateCtx annotates a given context with the information in AmbientContext, but unlike AnnotateCtx, it drops all log tags in the supplied context before adding the ones from the AmbientContext.

func (*AmbientContext) SetEventLog 

func (ac *AmbientContext) SetEventLog(family, title string)

SetEventLog sets up an event log. Annotated contexts log into this event log (unless there's an open Span).

type Entry 

type Entry struct {
	Severity Severity `protobuf:"varint,1,opt,name=severity,proto3,enum=cockroach.util.log.Severity" json:"severity,omitempty"`
	// Nanoseconds since the epoch.
	Time      int64  `protobuf:"varint,2,opt,name=time,proto3" json:"time,omitempty"`
	Goroutine int64  `protobuf:"varint,6,opt,name=goroutine,proto3" json:"goroutine,omitempty"`
	File      string `protobuf:"bytes,3,opt,name=file,proto3" json:"file,omitempty"`
	Line      int64  `protobuf:"varint,4,opt,name=line,proto3" json:"line,omitempty"`
	Message   string `protobuf:"bytes,5,opt,name=message,proto3" json:"message,omitempty"`
}

Entry represents a cockroach structured log entry.

func FetchEntriesFromFiles 

func FetchEntriesFromFiles(
	severity Severity, startTimestamp, endTimestamp int64, maxEntries int, pattern *regexp.Regexp,
) ([]Entry, error)

FetchEntriesFromFiles fetches all available log entries on disk that match the log 'severity' (or worse) and are between the 'startTimestamp' and 'endTimestamp'. It will stop reading new files if the number of entries exceeds 'maxEntries'. Log entries are further filtered by the regexp 'pattern' if provided. The logs entries are returned in reverse chronological order.

func (*Entry) Descriptor 

func (*Entry) Descriptor() ([]byte, []int)

func (*Entry) Marshal 

func (m *Entry) Marshal() (dAtA []byte, err error)

func (*Entry) MarshalTo 

func (m *Entry) MarshalTo(dAtA []byte) (int, error)

func (*Entry) ProtoMessage 

func (*Entry) ProtoMessage()

func (*Entry) Reset 

func (m *Entry) Reset()

func (*Entry) Size 

func (m *Entry) Size() (n int)

func (*Entry) String 

func (m *Entry) String() string

func (*Entry) Unmarshal 

func (m *Entry) Unmarshal(dAtA []byte) error

type EntryDecoder 

type EntryDecoder struct {
	// contains filtered or unexported fields
}

EntryDecoder reads successive encoded log entries from the input buffer. Each entry is preceded by a single big-ending uint32 describing the next entry's length.

func NewEntryDecoder 

func NewEntryDecoder(in io.Reader) *EntryDecoder

NewEntryDecoder creates a new instance of EntryDecoder.

func (*EntryDecoder) Decode 

func (d *EntryDecoder) Decode(entry *Entry) error

Decode decodes the next log entry into the provided protobuf message.

type FileDetails 

type FileDetails struct {
	Program  string   `protobuf:"bytes,1,opt,name=program,proto3" json:"program,omitempty"`
	Host     string   `protobuf:"bytes,2,opt,name=host,proto3" json:"host,omitempty"`
	UserName string   `protobuf:"bytes,3,opt,name=user_name,json=userName,proto3" json:"user_name,omitempty"`
	Severity Severity `protobuf:"varint,4,opt,name=severity,proto3,enum=cockroach.util.log.Severity" json:"severity,omitempty"`
	Time     int64    `protobuf:"varint,5,opt,name=time,proto3" json:"time,omitempty"`
	PID      int64    `protobuf:"varint,6,opt,name=pid,proto3" json:"pid,omitempty"`
}

A FileDetails holds all of the particulars that can be parsed by the name of a log file.

func (*FileDetails) Descriptor 

func (*FileDetails) Descriptor() ([]byte, []int)

func (*FileDetails) Marshal 

func (m *FileDetails) Marshal() (dAtA []byte, err error)

func (*FileDetails) MarshalTo 

func (m *FileDetails) MarshalTo(dAtA []byte) (int, error)

func (*FileDetails) ProtoMessage 

func (*FileDetails) ProtoMessage()

func (*FileDetails) Reset 

func (m *FileDetails) Reset()

func (*FileDetails) Size 

func (m *FileDetails) Size() (n int)

func (*FileDetails) String 

func (m *FileDetails) String() string

func (*FileDetails) Unmarshal 

func (m *FileDetails) Unmarshal(dAtA []byte) error

type FileInfo 

type FileInfo struct {
	Name         string      `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
	SizeBytes    int64       `protobuf:"varint,2,opt,name=size_bytes,json=sizeBytes,proto3" json:"size_bytes,omitempty"`
	ModTimeNanos int64       `protobuf:"varint,3,opt,name=mod_time_nanos,json=modTimeNanos,proto3" json:"mod_time_nanos,omitempty"`
	Details      FileDetails `protobuf:"bytes,4,opt,name=details" json:"details"`
}

func ListLogFiles 

func ListLogFiles() ([]FileInfo, error)

ListLogFiles returns a slice of FileInfo structs for each log file on the local node, in any of the configured log directories.

func (*FileInfo) Descriptor 

func (*FileInfo) Descriptor() ([]byte, []int)

func (*FileInfo) Marshal 

func (m *FileInfo) Marshal() (dAtA []byte, err error)

func (*FileInfo) MarshalTo 

func (m *FileInfo) MarshalTo(dAtA []byte) (int, error)

func (*FileInfo) ProtoMessage 

func (*FileInfo) ProtoMessage()

func (*FileInfo) Reset 

func (m *FileInfo) Reset()

func (*FileInfo) Size 

func (m *FileInfo) Size() (n int)

func (*FileInfo) String 

func (m *FileInfo) String() string

func (*FileInfo) Unmarshal 

func (m *FileInfo) Unmarshal(dAtA []byte) error

type Severity 

type Severity int32
const (
	Severity_UNKNOWN Severity = 0
	Severity_INFO    Severity = 1
	Severity_WARNING Severity = 2
	Severity_ERROR   Severity = 3
	Severity_FATAL   Severity = 4
	// NONE is the end sentinel. It is never used in pracice, and must be
	// renumbered to remain at the end if new variants are added.
	Severity_NONE Severity = 5
)

func SeverityByName 

func SeverityByName(s string) (Severity, bool)

SeverityByName attempts to parse the passed in string into a severity. (i.e. ERROR, INFO). If it succeeds, the returned bool is set to true.

func (Severity) EnumDescriptor 

func (Severity) EnumDescriptor() ([]byte, []int)

func (*Severity) Name 

func (s *Severity) Name() string

Name returns the string representation of the severity (i.e. ERROR, INFO).

func (*Severity) Set 

func (s *Severity) Set(value string) error

Set is part of the flag.Value interface.

func (Severity) String 

func (x Severity) String() string

type TestLogScope 

type TestLogScope string

TestLogScope represents the lifetime of a logging output. It ensures that the log files are stored in a directory specific to a test, and asserts that logging output is not written to this directory beyond the lifetime of the scope.

func Scope 

func Scope(t tShim, testName string) TestLogScope

Scope creates a TestLogScope which corresponds to the lifetime of a logging directory. If testName is empty, the logging directory is named after the caller of Scope, up `skip` caller levels. It also disables logging to stderr for severity levels below ERROR.

func (TestLogScope) Close 

func (l TestLogScope) Close(t tShim)

Close cleans up a TestLogScope. The directory and its contents are deleted, unless the test has failed and the directory is non-empty.

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