diff options
Diffstat (limited to 'vendor/github.com/opentracing/opentracing-go/log/field.go')
| -rw-r--r-- | vendor/github.com/opentracing/opentracing-go/log/field.go | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/vendor/github.com/opentracing/opentracing-go/log/field.go b/vendor/github.com/opentracing/opentracing-go/log/field.go new file mode 100644 index 000000000..50feea341 --- /dev/null +++ b/vendor/github.com/opentracing/opentracing-go/log/field.go @@ -0,0 +1,269 @@ +package log + +import ( + "fmt" + "math" +) + +type fieldType int + +const ( + stringType fieldType = iota + boolType + intType + int32Type + uint32Type + int64Type + uint64Type + float32Type + float64Type + errorType + objectType + lazyLoggerType + noopType +) + +// Field instances are constructed via LogBool, LogString, and so on. +// Tracing implementations may then handle them via the Field.Marshal +// method. +// +// "heavily influenced by" (i.e., partially stolen from) +// https://github.com/uber-go/zap +type Field struct { + key string + fieldType fieldType + numericVal int64 + stringVal string + interfaceVal interface{} +} + +// String adds a string-valued key:value pair to a Span.LogFields() record +func String(key, val string) Field { + return Field{ + key: key, + fieldType: stringType, + stringVal: val, + } +} + +// Bool adds a bool-valued key:value pair to a Span.LogFields() record +func Bool(key string, val bool) Field { + var numericVal int64 + if val { + numericVal = 1 + } + return Field{ + key: key, + fieldType: boolType, + numericVal: numericVal, + } +} + +// Int adds an int-valued key:value pair to a Span.LogFields() record +func Int(key string, val int) Field { + return Field{ + key: key, + fieldType: intType, + numericVal: int64(val), + } +} + +// Int32 adds an int32-valued key:value pair to a Span.LogFields() record +func Int32(key string, val int32) Field { + return Field{ + key: key, + fieldType: int32Type, + numericVal: int64(val), + } +} + +// Int64 adds an int64-valued key:value pair to a Span.LogFields() record +func Int64(key string, val int64) Field { + return Field{ + key: key, + fieldType: int64Type, + numericVal: val, + } +} + +// Uint32 adds a uint32-valued key:value pair to a Span.LogFields() record +func Uint32(key string, val uint32) Field { + return Field{ + key: key, + fieldType: uint32Type, + numericVal: int64(val), + } +} + +// Uint64 adds a uint64-valued key:value pair to a Span.LogFields() record +func Uint64(key string, val uint64) Field { + return Field{ + key: key, + fieldType: uint64Type, + numericVal: int64(val), + } +} + +// Float32 adds a float32-valued key:value pair to a Span.LogFields() record +func Float32(key string, val float32) Field { + return Field{ + key: key, + fieldType: float32Type, + numericVal: int64(math.Float32bits(val)), + } +} + +// Float64 adds a float64-valued key:value pair to a Span.LogFields() record +func Float64(key string, val float64) Field { + return Field{ + key: key, + fieldType: float64Type, + numericVal: int64(math.Float64bits(val)), + } +} + +// Error adds an error with the key "error" to a Span.LogFields() record +func Error(err error) Field { + return Field{ + key: "error", + fieldType: errorType, + interfaceVal: err, + } +} + +// Object adds an object-valued key:value pair to a Span.LogFields() record +func Object(key string, obj interface{}) Field { + return Field{ + key: key, + fieldType: objectType, + interfaceVal: obj, + } +} + +// LazyLogger allows for user-defined, late-bound logging of arbitrary data +type LazyLogger func(fv Encoder) + +// Lazy adds a LazyLogger to a Span.LogFields() record; the tracing +// implementation will call the LazyLogger function at an indefinite time in +// the future (after Lazy() returns). +func Lazy(ll LazyLogger) Field { + return Field{ + fieldType: lazyLoggerType, + interfaceVal: ll, + } +} + +// Noop creates a no-op log field that should be ignored by the tracer. +// It can be used to capture optional fields, for example those that should +// only be logged in non-production environment: +// +// func customerField(order *Order) log.Field { +// if os.Getenv("ENVIRONMENT") == "dev" { +// return log.String("customer", order.Customer.ID) +// } +// return log.Noop() +// } +// +// span.LogFields(log.String("event", "purchase"), customerField(order)) +// +func Noop() Field { + return Field{ + fieldType: noopType, + } +} + +// Encoder allows access to the contents of a Field (via a call to +// Field.Marshal). +// +// Tracer implementations typically provide an implementation of Encoder; +// OpenTracing callers typically do not need to concern themselves with it. +type Encoder interface { + EmitString(key, value string) + EmitBool(key string, value bool) + EmitInt(key string, value int) + EmitInt32(key string, value int32) + EmitInt64(key string, value int64) + EmitUint32(key string, value uint32) + EmitUint64(key string, value uint64) + EmitFloat32(key string, value float32) + EmitFloat64(key string, value float64) + EmitObject(key string, value interface{}) + EmitLazyLogger(value LazyLogger) +} + +// Marshal passes a Field instance through to the appropriate +// field-type-specific method of an Encoder. +func (lf Field) Marshal(visitor Encoder) { + switch lf.fieldType { + case stringType: + visitor.EmitString(lf.key, lf.stringVal) + case boolType: + visitor.EmitBool(lf.key, lf.numericVal != 0) + case intType: + visitor.EmitInt(lf.key, int(lf.numericVal)) + case int32Type: + visitor.EmitInt32(lf.key, int32(lf.numericVal)) + case int64Type: + visitor.EmitInt64(lf.key, int64(lf.numericVal)) + case uint32Type: + visitor.EmitUint32(lf.key, uint32(lf.numericVal)) + case uint64Type: + visitor.EmitUint64(lf.key, uint64(lf.numericVal)) + case float32Type: + visitor.EmitFloat32(lf.key, math.Float32frombits(uint32(lf.numericVal))) + case float64Type: + visitor.EmitFloat64(lf.key, math.Float64frombits(uint64(lf.numericVal))) + case errorType: + if err, ok := lf.interfaceVal.(error); ok { + visitor.EmitString(lf.key, err.Error()) + } else { + visitor.EmitString(lf.key, "<nil>") + } + case objectType: + visitor.EmitObject(lf.key, lf.interfaceVal) + case lazyLoggerType: + visitor.EmitLazyLogger(lf.interfaceVal.(LazyLogger)) + case noopType: + // intentionally left blank + } +} + +// Key returns the field's key. +func (lf Field) Key() string { + return lf.key +} + +// Value returns the field's value as interface{}. +func (lf Field) Value() interface{} { + switch lf.fieldType { + case stringType: + return lf.stringVal + case boolType: + return lf.numericVal != 0 + case intType: + return int(lf.numericVal) + case int32Type: + return int32(lf.numericVal) + case int64Type: + return int64(lf.numericVal) + case uint32Type: + return uint32(lf.numericVal) + case uint64Type: + return uint64(lf.numericVal) + case float32Type: + return math.Float32frombits(uint32(lf.numericVal)) + case float64Type: + return math.Float64frombits(uint64(lf.numericVal)) + case errorType, objectType, lazyLoggerType: + return lf.interfaceVal + case noopType: + return nil + default: + return nil + } +} + +// String returns a string representation of the key and value. +func (lf Field) String() string { + return fmt.Sprint(lf.key, ":", lf.Value()) +} |