cli.go

Documentation: cmd/vendor/github.com/google/pprof/internal/driver

     1  // Copyright 2014 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package driver
    16  
    17  import (
    18  	"errors"
    19  	"fmt"
    20  	"os"
    21  
    22  	"github.com/google/pprof/internal/binutils"
    23  	"github.com/google/pprof/internal/plugin"
    24  )
    25  
    26  type source struct {
    27  	Sources   []string
    28  	ExecName  string
    29  	BuildID   string
    30  	Base      []string
    31  	DiffBase  bool
    32  	Normalize bool
    33  
    34  	Seconds            int
    35  	Timeout            int
    36  	Symbolize          string
    37  	HTTPHostport       string
    38  	HTTPDisableBrowser bool
    39  	Comment            string
    40  }
    41  
    42  // parseFlags parses the command lines through the specified flags package
    43  // and returns the source of the profile and optionally the command
    44  // for the kind of report to generate (nil for interactive use).
    45  func parseFlags(o *plugin.Options) (*source, []string, error) {
    46  	flag := o.Flagset
    47  	// Comparisons.
    48  	flagDiffBase := flag.StringList("diff_base", "", "Source of base profile for comparison")
    49  	flagBase := flag.StringList("base", "", "Source of base profile for profile subtraction")
    50  	// Source options.
    51  	flagSymbolize := flag.String("symbolize", "", "Options for profile symbolization")
    52  	flagBuildID := flag.String("buildid", "", "Override build id for first mapping")
    53  	flagTimeout := flag.Int("timeout", -1, "Timeout in seconds for fetching a profile")
    54  	flagAddComment := flag.String("add_comment", "", "Annotation string to record in the profile")
    55  	// CPU profile options
    56  	flagSeconds := flag.Int("seconds", -1, "Length of time for dynamic profiles")
    57  	// Heap profile options
    58  	flagInUseSpace := flag.Bool("inuse_space", false, "Display in-use memory size")
    59  	flagInUseObjects := flag.Bool("inuse_objects", false, "Display in-use object counts")
    60  	flagAllocSpace := flag.Bool("alloc_space", false, "Display allocated memory size")
    61  	flagAllocObjects := flag.Bool("alloc_objects", false, "Display allocated object counts")
    62  	// Contention profile options
    63  	flagTotalDelay := flag.Bool("total_delay", false, "Display total delay at each region")
    64  	flagContentions := flag.Bool("contentions", false, "Display number of delays at each region")
    65  	flagMeanDelay := flag.Bool("mean_delay", false, "Display mean delay at each region")
    66  	flagTools := flag.String("tools", os.Getenv("PPROF_TOOLS"), "Path for object tool pathnames")
    67  
    68  	flagHTTP := flag.String("http", "", "Present interactive web UI at the specified http host:port")
    69  	flagNoBrowser := flag.Bool("no_browser", false, "Skip opening a browser for the interactive web UI")
    70  
    71  	// Flags that set configuration properties.
    72  	cfg := currentConfig()
    73  	configFlagSetter := installConfigFlags(flag, &cfg)
    74  
    75  	flagCommands := make(map[string]*bool)
    76  	flagParamCommands := make(map[string]*string)
    77  	for name, cmd := range pprofCommands {
    78  		if cmd.hasParam {
    79  			flagParamCommands[name] = flag.String(name, "", "Generate a report in "+name+" format, matching regexp")
    80  		} else {
    81  			flagCommands[name] = flag.Bool(name, false, "Generate a report in "+name+" format")
    82  		}
    83  	}
    84  
    85  	args := flag.Parse(func() {
    86  		o.UI.Print(usageMsgHdr +
    87  			usage(true) +
    88  			usageMsgSrc +
    89  			flag.ExtraUsage() +
    90  			usageMsgVars)
    91  	})
    92  	if len(args) == 0 {
    93  		return nil, nil, errors.New("no profile source specified")
    94  	}
    95  
    96  	var execName string
    97  	// Recognize first argument as an executable or buildid override.
    98  	if len(args) > 1 {
    99  		arg0 := args[0]
   100  		if file, err := o.Obj.Open(arg0, 0, ^uint64(0), 0, ""); err == nil {
   101  			file.Close()
   102  			execName = arg0
   103  			args = args[1:]
   104  		}
   105  	}
   106  
   107  	// Apply any specified flags to cfg.
   108  	if err := configFlagSetter(); err != nil {
   109  		return nil, nil, err
   110  	}
   111  
   112  	cmd, err := outputFormat(flagCommands, flagParamCommands)
   113  	if err != nil {
   114  		return nil, nil, err
   115  	}
   116  	if cmd != nil && *flagHTTP != "" {
   117  		return nil, nil, errors.New("-http is not compatible with an output format on the command line")
   118  	}
   119  
   120  	if *flagNoBrowser && *flagHTTP == "" {
   121  		return nil, nil, errors.New("-no_browser only makes sense with -http")
   122  	}
   123  
   124  	si := cfg.SampleIndex
   125  	si = sampleIndex(flagTotalDelay, si, "delay", "-total_delay", o.UI)
   126  	si = sampleIndex(flagMeanDelay, si, "delay", "-mean_delay", o.UI)
   127  	si = sampleIndex(flagContentions, si, "contentions", "-contentions", o.UI)
   128  	si = sampleIndex(flagInUseSpace, si, "inuse_space", "-inuse_space", o.UI)
   129  	si = sampleIndex(flagInUseObjects, si, "inuse_objects", "-inuse_objects", o.UI)
   130  	si = sampleIndex(flagAllocSpace, si, "alloc_space", "-alloc_space", o.UI)
   131  	si = sampleIndex(flagAllocObjects, si, "alloc_objects", "-alloc_objects", o.UI)
   132  	cfg.SampleIndex = si
   133  
   134  	if *flagMeanDelay {
   135  		cfg.Mean = true
   136  	}
   137  
   138  	source := &source{
   139  		Sources:            args,
   140  		ExecName:           execName,
   141  		BuildID:            *flagBuildID,
   142  		Seconds:            *flagSeconds,
   143  		Timeout:            *flagTimeout,
   144  		Symbolize:          *flagSymbolize,
   145  		HTTPHostport:       *flagHTTP,
   146  		HTTPDisableBrowser: *flagNoBrowser,
   147  		Comment:            *flagAddComment,
   148  	}
   149  
   150  	if err := source.addBaseProfiles(*flagBase, *flagDiffBase); err != nil {
   151  		return nil, nil, err
   152  	}
   153  
   154  	normalize := cfg.Normalize
   155  	if normalize && len(source.Base) == 0 {
   156  		return nil, nil, errors.New("must have base profile to normalize by")
   157  	}
   158  	source.Normalize = normalize
   159  
   160  	if bu, ok := o.Obj.(*binutils.Binutils); ok {
   161  		bu.SetTools(*flagTools)
   162  	}
   163  
   164  	setCurrentConfig(cfg)
   165  	return source, cmd, nil
   166  }
   167  
   168  // addBaseProfiles adds the list of base profiles or diff base profiles to
   169  // the source. This function will return an error if both base and diff base
   170  // profiles are specified.
   171  func (source *source) addBaseProfiles(flagBase, flagDiffBase []*string) error {
   172  	base, diffBase := dropEmpty(flagBase), dropEmpty(flagDiffBase)
   173  	if len(base) > 0 && len(diffBase) > 0 {
   174  		return errors.New("-base and -diff_base flags cannot both be specified")
   175  	}
   176  
   177  	source.Base = base
   178  	if len(diffBase) > 0 {
   179  		source.Base, source.DiffBase = diffBase, true
   180  	}
   181  	return nil
   182  }
   183  
   184  // dropEmpty list takes a slice of string pointers, and outputs a slice of
   185  // non-empty strings associated with the flag.
   186  func dropEmpty(list []*string) []string {
   187  	var l []string
   188  	for _, s := range list {
   189  		if *s != "" {
   190  			l = append(l, *s)
   191  		}
   192  	}
   193  	return l
   194  }
   195  
   196  // installConfigFlags creates command line flags for configuration
   197  // fields and returns a function which can be called after flags have
   198  // been parsed to copy any flags specified on the command line to
   199  // *cfg.
   200  func installConfigFlags(flag plugin.FlagSet, cfg *config) func() error {
   201  	// List of functions for setting the different parts of a config.
   202  	var setters []func()
   203  	var err error // Holds any errors encountered while running setters.
   204  
   205  	for _, field := range configFields {
   206  		n := field.name
   207  		help := configHelp[n]
   208  		var setter func()
   209  		switch ptr := cfg.fieldPtr(field).(type) {
   210  		case *bool:
   211  			f := flag.Bool(n, *ptr, help)
   212  			setter = func() { *ptr = *f }
   213  		case *int:
   214  			f := flag.Int(n, *ptr, help)
   215  			setter = func() { *ptr = *f }
   216  		case *float64:
   217  			f := flag.Float64(n, *ptr, help)
   218  			setter = func() { *ptr = *f }
   219  		case *string:
   220  			if len(field.choices) == 0 {
   221  				f := flag.String(n, *ptr, help)
   222  				setter = func() { *ptr = *f }
   223  			} else {
   224  				// Make a separate flag per possible choice.
   225  				// Set all flags to initially false so we can
   226  				// identify conflicts.
   227  				bools := make(map[string]*bool)
   228  				for _, choice := range field.choices {
   229  					bools[choice] = flag.Bool(choice, false, configHelp[choice])
   230  				}
   231  				setter = func() {
   232  					var set []string
   233  					for k, v := range bools {
   234  						if *v {
   235  							set = append(set, k)
   236  						}
   237  					}
   238  					switch len(set) {
   239  					case 0:
   240  						// Leave as default value.
   241  					case 1:
   242  						*ptr = set[0]
   243  					default:
   244  						err = fmt.Errorf("conflicting options set: %v", set)
   245  					}
   246  				}
   247  			}
   248  		}
   249  		setters = append(setters, setter)
   250  	}
   251  
   252  	return func() error {
   253  		// Apply the setter for every flag.
   254  		for _, setter := range setters {
   255  			setter()
   256  			if err != nil {
   257  				return err
   258  			}
   259  		}
   260  		return nil
   261  	}
   262  }
   263  
   264  func sampleIndex(flag *bool, si string, sampleType, option string, ui plugin.UI) string {
   265  	if *flag {
   266  		if si == "" {
   267  			return sampleType
   268  		}
   269  		ui.PrintErr("Multiple value selections, ignoring ", option)
   270  	}
   271  	return si
   272  }
   273  
   274  func outputFormat(bcmd map[string]*bool, acmd map[string]*string) (cmd []string, err error) {
   275  	for n, b := range bcmd {
   276  		if *b {
   277  			if cmd != nil {
   278  				return nil, errors.New("must set at most one output format")
   279  			}
   280  			cmd = []string{n}
   281  		}
   282  	}
   283  	for n, s := range acmd {
   284  		if *s != "" {
   285  			if cmd != nil {
   286  				return nil, errors.New("must set at most one output format")
   287  			}
   288  			cmd = []string{n, *s}
   289  		}
   290  	}
   291  	return cmd, nil
   292  }
   293  
   294  var usageMsgHdr = `usage:
   295  
   296  Produce output in the specified format.
   297  
   298     pprof <format> [options] [binary] <source> ...
   299  
   300  Omit the format to get an interactive shell whose commands can be used
   301  to generate various views of a profile
   302  
   303     pprof [options] [binary] <source> ...
   304  
   305  Omit the format and provide the "-http" flag to get an interactive web
   306  interface at the specified host:port that can be used to navigate through
   307  various views of a profile.
   308  
   309     pprof -http [host]:[port] [options] [binary] <source> ...
   310  
   311  Details:
   312  `
   313  
   314  var usageMsgSrc = "\n\n" +
   315  	"  Source options:\n" +
   316  	"    -seconds              Duration for time-based profile collection\n" +
   317  	"    -timeout              Timeout in seconds for profile collection\n" +
   318  	"    -buildid              Override build id for main binary\n" +
   319  	"    -add_comment          Free-form annotation to add to the profile\n" +
   320  	"                          Displayed on some reports or with pprof -comments\n" +
   321  	"    -diff_base source     Source of base profile for comparison\n" +
   322  	"    -base source          Source of base profile for profile subtraction\n" +
   323  	"    profile.pb.gz         Profile in compressed protobuf format\n" +
   324  	"    legacy_profile        Profile in legacy pprof format\n" +
   325  	"    http://host/profile   URL for profile handler to retrieve\n" +
   326  	"    -symbolize=           Controls source of symbol information\n" +
   327  	"      none                  Do not attempt symbolization\n" +
   328  	"      local                 Examine only local binaries\n" +
   329  	"      fastlocal             Only get function names from local binaries\n" +
   330  	"      remote                Do not examine local binaries\n" +
   331  	"      force                 Force re-symbolization\n" +
   332  	"    Binary                  Local path or build id of binary for symbolization\n"
   333  
   334  var usageMsgVars = "\n\n" +
   335  	"  Misc options:\n" +
   336  	"   -http              Provide web interface at host:port.\n" +
   337  	"                      Host is optional and 'localhost' by default.\n" +
   338  	"                      Port is optional and a randomly available port by default.\n" +
   339  	"   -no_browser        Skip opening a browser for the interactive web UI.\n" +
   340  	"   -tools             Search path for object tools\n" +
   341  	"\n" +
   342  	"  Legacy convenience options:\n" +
   343  	"   -inuse_space           Same as -sample_index=inuse_space\n" +
   344  	"   -inuse_objects         Same as -sample_index=inuse_objects\n" +
   345  	"   -alloc_space           Same as -sample_index=alloc_space\n" +
   346  	"   -alloc_objects         Same as -sample_index=alloc_objects\n" +
   347  	"   -total_delay           Same as -sample_index=delay\n" +
   348  	"   -contentions           Same as -sample_index=contentions\n" +
   349  	"   -mean_delay            Same as -mean -sample_index=delay\n" +
   350  	"\n" +
   351  	"  Environment Variables:\n" +
   352  	"   PPROF_TMPDIR       Location for saved profiles (default $HOME/pprof)\n" +
   353  	"   PPROF_TOOLS        Search path for object-level tools\n" +
   354  	"   PPROF_BINARY_PATH  Search path for local binary files\n" +
   355  	"                      default: $HOME/pprof/binaries\n" +
   356  	"                      searches $buildid/$name, $buildid/*, $path/$buildid,\n" +
   357  	"                      ${buildid:0:2}/${buildid:2}.debug, $name, $path,\n" +
   358  	"                      ${name}.debug, $dir/.debug/${name}.debug,\n" +
   359  	"                      usr/lib/debug/$dir/${name}.debug\n" +
   360  	"   * On Windows, %USERPROFILE% is used instead of $HOME"
   361
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