github.com/m3db/m3@v1.5.0/src/query/storage/error_behavior.go (about)

     1  // Copyright (c) 2019 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package storage
    22  
    23  import "fmt"
    24  
    25  var (
    26  	// NB: Container behavior must not be defined in configs, so it does not count
    27  	// as a parsable behavior. This is because it's a composite storage type that
    28  	// refers to fanout storage, and requires further parsing to determine error
    29  	// behavior.
    30  	parsableErrorBehaviors = []ErrorBehavior{
    31  		BehaviorFail,
    32  		BehaviorWarn,
    33  	}
    34  )
    35  
    36  func (e ErrorBehavior) String() string {
    37  	switch e {
    38  	case BehaviorFail:
    39  		return "fail"
    40  	case BehaviorWarn:
    41  		return "warn"
    42  	case BehaviorContainer:
    43  		return "container"
    44  	default:
    45  		return "unknown"
    46  	}
    47  }
    48  
    49  // ParseErrorBehavior parses an error behavior.
    50  func ParseErrorBehavior(str string) (ErrorBehavior, error) {
    51  	for _, valid := range parsableErrorBehaviors {
    52  		if str == valid.String() {
    53  			return valid, nil
    54  		}
    55  	}
    56  
    57  	return 0, fmt.Errorf("unrecognized error behavior: %v", str)
    58  }
    59  
    60  // UnmarshalYAML unmarshals an error behavior.
    61  func (e *ErrorBehavior) UnmarshalYAML(unmarshal func(interface{}) error) error {
    62  	var str string
    63  	if err := unmarshal(&str); err != nil {
    64  		return err
    65  	}
    66  
    67  	if value, err := ParseErrorBehavior(str); err == nil {
    68  		*e = value
    69  		return nil
    70  	}
    71  
    72  	return fmt.Errorf("invalid ErrorBehavior '%s' valid types are: %v",
    73  		str, parsableErrorBehaviors)
    74  }
    75  
    76  // IsWarning determines if the given error coming from the storage is a warning,
    77  // and returns it with appropriate wrapping.
    78  func IsWarning(store Storage, err error) (bool, error) {
    79  	if _, ok := err.(warnError); ok {
    80  		return true, err
    81  	}
    82  
    83  	if store.ErrorBehavior() == BehaviorWarn {
    84  		return true, warnError{err}
    85  	}
    86  
    87  	return false, err
    88  }
    89  
    90  // warnError is an error that should only warn on failure.
    91  type warnError struct {
    92  	inner error
    93  }
    94  
    95  func (e warnError) Error() string {
    96  	return e.inner.Error()
    97  }