bson

package
v1.4.0-beta2 Latest Latest
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 Go to latest Published: Jun 9, 2020 License: Apache-2.0 Imports: 12 Imported by: 20,172

Documentation

Overview

Package bson is a library for reading, writing, and manipulating BSON. BSON is a binary serialization format used to store documents and make remote procedure calls in MongoDB. The BSON specification is located at https://bsonspec.org. The BSON library handles marshalling and unmarshalling of values through a configurable codec system. For a description of the codec system and examples of registering custom codecs, see the bsoncodec package.

Raw BSON

The Raw family of types is used to validate and retrieve elements from a slice of bytes. This type is most useful when you want do lookups on BSON bytes without unmarshaling it into another type.

Example: 

var raw bson.Raw = ... // bytes from somewhere
err := raw.Validate()
if err != nil { return err }
val := raw.Lookup("foo")
i32, ok := val.Int32OK()
// do something with i32...

Native Go Types

The D and M types defined in this package can be used to build representations of BSON using native Go types. D is a slice and M is a map. For more information about the use cases for these types, see the documentation on the type definitions.

Example: 

bson.D{{"foo", "bar"}, {"hello", "world"}, {"pi", 3.14159}}
bson.M{"foo": "bar", "hello": "world", "pi": 3.14159}

When decoding BSON to a D or M, the following type mappings apply when unmarshalling:

  1. BSON int32 unmarshals to an int32.
  2. BSON int64 unmarshals to an int64.
  3. BSON double unmarshals to a float64.
  4. BSON string unmarshals to a string.
  5. BSON boolean unmarshals to a bool.
  6. BSON embedded document unmarshals to the parent type (i.e. D for a D, M for an M).
  7. BSON array unmarshals to a bson.A.
  8. BSON ObjectId unmarshals to a primitive.ObjectID.
  9. BSON datetime unmarshals to a primitive.Datetime.
  10. BSON binary unmarshals to a primitive.Binary.
  11. BSON regular expression unmarshals to a primitive.Regex.
  12. BSON JavaScript unmarshals to a primitive.JavaScript.
  13. BSON code with scope unmarshals to a primitive.CodeWithScope.
  14. BSON timestamp unmarshals to an primitive.Timestamp.
  15. BSON 128-bit decimal unmarshals to an primitive.Decimal128.
  16. BSON min key unmarshals to an primitive.MinKey.
  17. BSON max key unmarshals to an primitive.MaxKey.
  18. BSON undefined unmarshals to a primitive.Undefined.
  19. BSON null unmarshals to a primitive.Null.
  20. BSON DBPointer unmarshals to a primitive.DBPointer.
  21. BSON symbol unmarshals to a primitive.Symbol.

The above mappings also apply when marshalling a D or M to BSON. Some other useful marshalling mappings are:

  1. time.Time marshals to a BSON datetime.
  2. int8, int16, and int32 marshal to a BSON int32.
  3. int marshals to a BSON int32 if the value is between math.MinInt32 and math.MaxInt32, inclusive, and a BSON int64 otherwise.
  4. int64 marshals to BSON int64.
  5. uint8 and uint16 marshal to a BSON int32.
  6. uint, uint32, and uint64 marshal to a BSON int32 if the value is between math.MinInt32 and math.MaxInt32, inclusive, and BSON int64 otherwise.
  7. BSON null and undefined values will unmarshal into the zero value of a field (e.g. unmarshalling a BSON null or undefined value into a string will yield the empty string.).

Structs

Structs can be marshalled/unmarshalled to/from BSON or Extended JSON. When transforming structs to/from BSON or Extended JSON, the following rules apply:

  1. Only exported fields in structs will be marshalled or unmarshalled.

  2. When marshalling a struct, each field will be lowercased to generate the key for the corresponding BSON element. For example, a struct field named "Foo" will generate key "foo". This can be overriden via a struct tag (e.g. `bson:"fooField"` to generate key "fooField" instead).

  3. An embedded struct field is marshalled as a subdocument. The key will be the lowercased name of the field's type.

  4. A pointer field is marshalled as the underlying type if the pointer is non-nil. If the pointer is nil, it is marshalled as a BSON null value.

  5. When unmarshalling, a field of type interface{} will follow the D/M type mappings listed above. BSON documents unmarshalled into an interface{} field will be unmarshalled as a D.

The encoding of each struct field can be customized by the "bson" struct tag. The tag gives the name of the field, possibly followed by a comma-separated list of options. The name may be empty in order to specify options without overriding the default field name. The following options can be used to configure behavior:

  1. omitempty: If the omitempty struct tag is specified on a field, the field will not be marshalled if it is set to the zero value. By default, a struct field is only considered empty if the field's type implements the Zeroer interface and the IsZero method returns true. Struct fields of types that do not implement Zeroer are always marshalled as embedded documents. This tag should be used for all slice and map values.

  2. minsize: If the minsize struct tag is specified on a field of type int64, uint, uint32, or uint64 and the value of the field can fit in a signed int32, the field will be serialized as a BSON int32 rather than a BSON int64. For other types, this tag is ignored.

  3. truncate: If the truncate struct tag is specified on a field with a non-float numeric type, BSON doubles unmarshalled into that field will be trucated at the decimal point. For example, if 3.14 is unmarshalled into a field of type int, it will be unmarshalled as 3. If this tag is not specified, the decoder will throw an error if the value cannot be decoded without losing precision. For float64 or non-numeric types, this tag is ignored.

  4. inline: If the inline struct tag is specified for a struct or map field, the field will be "flattened" when marshalling and "un-flattened" when unmarshalling. This means that all of the fields in that struct/map will be pulled up one level and will become top-level fields rather than being fields in a nested document. For example, if a map field named "Map" with value map[string]interface{}{"foo": "bar"} is inlined, the resulting document will be {"foo": "bar"} instead of {"map": {"foo": "bar"}}. There can only be one inlined map field in a struct. If there are duplicated fields in the resulting document when an inlined field is marshalled, an error will be returned. This tag can be used with fields that are pointers to structs. If an inlined pointer field is nil, it will not be marshalled. For fields that are not maps or structs, this tag is ignored.

Marshalling and Unmarshalling

Manually marshalling and unmarshalling can be done with the Marshal and Unmarshal family of functions.

Index

Examples

Constants

View Source 
const (
	TypeDouble           = bsontype.Double
	TypeString           = bsontype.String
	TypeEmbeddedDocument = bsontype.EmbeddedDocument
	TypeArray            = bsontype.Array
	TypeBinary           = bsontype.Binary
	TypeUndefined        = bsontype.Undefined
	TypeObjectID         = bsontype.ObjectID
	TypeBoolean          = bsontype.Boolean
	TypeDateTime         = bsontype.DateTime
	TypeNull             = bsontype.Null
	TypeRegex            = bsontype.Regex
	TypeDBPointer        = bsontype.DBPointer
	TypeJavaScript       = bsontype.JavaScript
	TypeSymbol           = bsontype.Symbol
	TypeCodeWithScope    = bsontype.CodeWithScope
	TypeInt32            = bsontype.Int32
	TypeTimestamp        = bsontype.Timestamp
	TypeInt64            = bsontype.Int64
	TypeDecimal128       = bsontype.Decimal128
	TypeMinKey           = bsontype.MinKey
	TypeMaxKey           = bsontype.MaxKey
)

These constants uniquely refer to each BSON type.

Variables

View Source 
var DefaultRegistry = NewRegistryBuilder().Build()

DefaultRegistry is the default bsoncodec.Registry. It contains the default codecs and the primitive codecs.

View Source 
var ErrDecodeToNil = errors.New("cannot Decode to nil value")

ErrDecodeToNil is the error returned when trying to decode to a nil value

View Source 
var ErrNilContext = errors.New("DecodeContext cannot be nil")

ErrNilContext is returned when the provided DecodeContext is nil.

View Source 
var ErrNilReader = errors.New("nil reader")

ErrNilReader indicates that an operation was attempted on a nil bson.Reader.

View Source 
var ErrNilRegistry = errors.New("Registry cannot be nil")

ErrNilRegistry is returned when the provided registry is nil.

Functions

func Marshal added in v0.0.2 

func Marshal(val interface{}) ([]byte, error)

Marshal returns the BSON encoding of val as a BSON document. If val is not a type that can be transformed into a document, MarshalValue should be used instead.

Marshal will use the default registry created by NewRegistry to recursively marshal val into a []byte. Marshal will inspect struct tags and alter the marshaling process accordingly.

func MarshalAppend added in v0.0.14 

func MarshalAppend(dst []byte, val interface{}) ([]byte, error)

MarshalAppend will encode val as a BSON document and append the bytes to dst. If dst is not large enough to hold the bytes, it will be grown. If val is not a type that can be transformed into a document, MarshalValueAppend should be used instead.

func MarshalAppendWithContext added in v0.2.0 

func MarshalAppendWithContext(ec bsoncodec.EncodeContext, dst []byte, val interface{}) ([]byte, error)

MarshalAppendWithContext will encode val as a BSON document using Registry r and EncodeContext ec and append the bytes to dst. If dst is not large enough to hold the bytes, it will be grown. If val is not a type that can be transformed into a document, MarshalValueAppendWithContext should be used instead.

func MarshalAppendWithRegistry added in v0.0.14 

func MarshalAppendWithRegistry(r *bsoncodec.Registry, dst []byte, val interface{}) ([]byte, error)

MarshalAppendWithRegistry will encode val as a BSON document using Registry r and append the bytes to dst. If dst is not large enough to hold the bytes, it will be grown. If val is not a type that can be transformed into a document, MarshalValueAppendWithRegistry should be used instead.

func MarshalExtJSON added in v0.0.17 

func MarshalExtJSON(val interface{}, canonical, escapeHTML bool) ([]byte, error)

MarshalExtJSON returns the extended JSON encoding of val.

func MarshalExtJSONAppend added in v0.0.17 

func MarshalExtJSONAppend(dst []byte, val interface{}, canonical, escapeHTML bool) ([]byte, error)

MarshalExtJSONAppend will append the extended JSON encoding of val to dst. If dst is not large enough to hold the extended JSON encoding of val, dst will be grown.

func MarshalExtJSONAppendWithContext added in v0.2.0 

func MarshalExtJSONAppendWithContext(ec bsoncodec.EncodeContext, dst []byte, val interface{}, canonical, escapeHTML bool) ([]byte, error)

MarshalExtJSONAppendWithContext will append the extended JSON encoding of val to dst using Registry r. If dst is not large enough to hold the BSON encoding of val, dst will be grown.

func MarshalExtJSONAppendWithRegistry added in v0.0.17 

func MarshalExtJSONAppendWithRegistry(r *bsoncodec.Registry, dst []byte, val interface{}, canonical, escapeHTML bool) ([]byte, error)

MarshalExtJSONAppendWithRegistry will append the extended JSON encoding of val to dst using Registry r. If dst is not large enough to hold the BSON encoding of val, dst will be grown.

func MarshalExtJSONWithContext added in v0.2.0 

func MarshalExtJSONWithContext(ec bsoncodec.EncodeContext, val interface{}, canonical, escapeHTML bool) ([]byte, error)

MarshalExtJSONWithContext returns the extended JSON encoding of val using Registry r.

func MarshalExtJSONWithRegistry added in v0.0.17 

func MarshalExtJSONWithRegistry(r *bsoncodec.Registry, val interface{}, canonical, escapeHTML bool) ([]byte, error)

MarshalExtJSONWithRegistry returns the extended JSON encoding of val using Registry r.

func MarshalValue added in v1.2.0 

func MarshalValue(val interface{}) (bsontype.Type, []byte, error)

MarshalValue returns the BSON encoding of val.

MarshalValue will use bson.DefaultRegistry to transform val into a BSON value. If val is a struct, this function will inspect struct tags and alter the marshalling process accordingly.

func MarshalValueAppend added in v1.2.0 

func MarshalValueAppend(dst []byte, val interface{}) (bsontype.Type, []byte, error)

MarshalValueAppend will append the BSON encoding of val to dst. If dst is not large enough to hold the BSON encoding of val, dst will be grown.

func MarshalValueAppendWithContext added in v1.2.0 

func MarshalValueAppendWithContext(ec bsoncodec.EncodeContext, dst []byte, val interface{}) (bsontype.Type, []byte, error)

MarshalValueAppendWithContext will append the BSON encoding of val to dst using EncodeContext ec. If dst is not large enough to hold the BSON encoding of val, dst will be grown.

func MarshalValueAppendWithRegistry added in v1.2.0 

func MarshalValueAppendWithRegistry(r *bsoncodec.Registry, dst []byte, val interface{}) (bsontype.Type, []byte, error)

MarshalValueAppendWithRegistry will append the BSON encoding of val to dst using Registry r. If dst is not large enough to hold the BSON encoding of val, dst will be grown.

func MarshalValueWithContext added in v1.2.0 

func MarshalValueWithContext(ec bsoncodec.EncodeContext, val interface{}) (bsontype.Type, []byte, error)

MarshalValueWithContext returns the BSON encoding of val using EncodeContext ec.

func MarshalValueWithRegistry added in v1.2.0 

func MarshalValueWithRegistry(r *bsoncodec.Registry, val interface{}) (bsontype.Type, []byte, error)

MarshalValueWithRegistry returns the BSON encoding of val using Registry r.

func MarshalWithContext added in v0.2.0 

func MarshalWithContext(ec bsoncodec.EncodeContext, val interface{}) ([]byte, error)

MarshalWithContext returns the BSON encoding of val as a BSON document using EncodeContext ec. If val is not a type that can be transformed into a document, MarshalValueWithContext should be used instead.

func MarshalWithRegistry added in v0.0.14 

func MarshalWithRegistry(r *bsoncodec.Registry, val interface{}) ([]byte, error)

MarshalWithRegistry returns the BSON encoding of val as a BSON document. If val is not a type that can be transformed into a document, MarshalValueWithRegistry should be used instead.

func NewRegistryBuilder added in v0.0.14 

func NewRegistryBuilder() *bsoncodec.RegistryBuilder

NewRegistryBuilder creates a new RegistryBuilder configured with the default encoders and deocders from the bsoncodec.DefaultValueEncoders and bsoncodec.DefaultValueDecoders types and the PrimitiveCodecs type in this package.

func Unmarshal added in v0.0.2 

func Unmarshal(data []byte, val interface{}) error

Unmarshal parses the BSON-encoded data and stores the result in the value pointed to by val. If val is nil or not a pointer, Unmarshal returns InvalidUnmarshalError.

func UnmarshalExtJSON added in v0.0.17 

func UnmarshalExtJSON(data []byte, canonical bool, val interface{}) error

UnmarshalExtJSON parses the extended JSON-encoded data and stores the result in the value pointed to by val. If val is nil or not a pointer, Unmarshal returns InvalidUnmarshalError.

func UnmarshalExtJSONWithContext added in v0.2.0 

func UnmarshalExtJSONWithContext(dc bsoncodec.DecodeContext, data []byte, canonical bool, val interface{}) error

UnmarshalExtJSONWithContext parses the extended JSON-encoded data using DecodeContext dc and stores the result in the value pointed to by val. If val is nil or not a pointer, UnmarshalWithRegistry returns InvalidUnmarshalError.

func UnmarshalExtJSONWithRegistry added in v0.0.17 

func UnmarshalExtJSONWithRegistry(r *bsoncodec.Registry, data []byte, canonical bool, val interface{}) error

UnmarshalExtJSONWithRegistry parses the extended JSON-encoded data using Registry r and stores the result in the value pointed to by val. If val is nil or not a pointer, UnmarshalWithRegistry returns InvalidUnmarshalError.

func UnmarshalWithContext added in v0.2.0 

func UnmarshalWithContext(dc bsoncodec.DecodeContext, data []byte, val interface{}) error

UnmarshalWithContext parses the BSON-encoded data using DecodeContext dc and stores the result in the value pointed to by val. If val is nil or not a pointer, UnmarshalWithRegistry returns InvalidUnmarshalError.

func UnmarshalWithRegistry added in v0.0.14 

func UnmarshalWithRegistry(r *bsoncodec.Registry, data []byte, val interface{}) error

UnmarshalWithRegistry parses the BSON-encoded data using Registry r and stores the result in the value pointed to by val. If val is nil or not a pointer, UnmarshalWithRegistry returns InvalidUnmarshalError.

Types

type A added in v0.0.18 

type A = primitive.A

An A is an ordered representation of a BSON array.

Example usage: 

bson.A{"bar", "world", 3.14159, bson.D{{"qux", 12345}}}

type D added in v0.0.18 

type D = primitive.D

D is an ordered representation of a BSON document. This type should be used when the order of the elements matters, such as MongoDB command documents. If the order of the elements does not matter, an M should be used instead.

Example usage: 

bson.D{{"foo", "bar"}, {"hello", "world"}, {"pi", 3.14159}}

type Decoder 

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

A Decoder reads and decodes BSON documents from a stream. It reads from a bsonrw.ValueReader as the source of BSON data.

func NewDecoder 

func NewDecoder(vr bsonrw.ValueReader) (*Decoder, error)

NewDecoder returns a new decoder that uses the DefaultRegistry to read from vr.

func NewDecoderWithContext added in v0.2.0 

func NewDecoderWithContext(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader) (*Decoder, error)

NewDecoderWithContext returns a new decoder that uses DecodeContext dc to read from vr.

func (*Decoder) Decode 

func (d *Decoder) Decode(val interface{}) error

Decode reads the next BSON document from the stream and decodes it into the value pointed to by val.

The documentation for Unmarshal contains details about of BSON into a Go value.

func (*Decoder) Reset added in v0.0.17 

func (d *Decoder) Reset(vr bsonrw.ValueReader) error

Reset will reset the state of the decoder, using the same *DecodeContext used in the original construction but using vr for reading.

func (*Decoder) SetContext added in v0.2.0 

func (d *Decoder) SetContext(dc bsoncodec.DecodeContext) error

SetContext replaces the current registry of the decoder with dc.

func (*Decoder) SetRegistry added in v0.0.17 

func (d *Decoder) SetRegistry(r *bsoncodec.Registry) error

SetRegistry replaces the current registry of the decoder with r.

type E added in v0.0.18 

type E = primitive.E

E represents a BSON element for a D. It is usually used inside a D.

type Encoder 

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

An Encoder writes a serialization format to an output stream. It writes to a bsonrw.ValueWriter as the destination of BSON data.

func NewEncoder 

func NewEncoder(vw bsonrw.ValueWriter) (*Encoder, error)

NewEncoder returns a new encoder that uses the DefaultRegistry to write to vw.

func NewEncoderWithContext added in v0.2.0 

func NewEncoderWithContext(ec bsoncodec.EncodeContext, vw bsonrw.ValueWriter) (*Encoder, error)

NewEncoderWithContext returns a new encoder that uses EncodeContext ec to write to vw.

func (*Encoder) Encode 

func (e *Encoder) Encode(val interface{}) error

Encode writes the BSON encoding of val to the stream.

The documentation for Marshal contains details about the conversion of Go values to BSON.

func (*Encoder) Reset added in v0.0.17 

func (e *Encoder) Reset(vw bsonrw.ValueWriter) error

Reset will reset the state of the encoder, using the same *EncodeContext used in the original construction but using vw.

func (*Encoder) SetContext added in v0.2.0 

func (e *Encoder) SetContext(ec bsoncodec.EncodeContext) error

SetContext replaces the current EncodeContext of the encoder with er.

func (*Encoder) SetRegistry added in v0.0.17 

func (e *Encoder) SetRegistry(r *bsoncodec.Registry) error

SetRegistry replaces the current registry of the encoder with r.

type M added in v0.0.18 

type M = primitive.M

M is an unordered representation of a BSON document. This type should be used when the order of the elements does not matter. This type is handled as a regular map[string]interface{} when encoding and decoding. Elements will be serialized in an undefined, random order. If the order of the elements matters, a D should be used instead.

Example usage: 

bson.M{"foo": "bar", "hello": "world", "pi": 3.14159}

type Marshaler 

type Marshaler interface {
	MarshalBSON() ([]byte, error)
}

Marshaler is an interface implemented by types that can marshal themselves into a BSON document represented as bytes. The bytes returned must be a valid BSON document if the error is nil.

type PrimitiveCodecs added in v0.0.17 

type PrimitiveCodecs struct{}

PrimitiveCodecs is a namespace for all of the default bsoncodec.Codecs for the primitive types defined in this package.

func (PrimitiveCodecs) RawDecodeValue added in v0.0.18 

func (PrimitiveCodecs) RawDecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error

RawDecodeValue is the ValueDecoderFunc for Reader.

func (PrimitiveCodecs) RawEncodeValue added in v0.0.18 

func (PrimitiveCodecs) RawEncodeValue(ec bsoncodec.EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error

RawEncodeValue is the ValueEncoderFunc for Reader.

func (PrimitiveCodecs) RawValueDecodeValue added in v0.0.18 

func (PrimitiveCodecs) RawValueDecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error

RawValueDecodeValue is the ValueDecoderFunc for RawValue.

func (PrimitiveCodecs) RawValueEncodeValue added in v0.0.18 

func (PrimitiveCodecs) RawValueEncodeValue(ec bsoncodec.EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error

RawValueEncodeValue is the ValueEncoderFunc for RawValue.

func (PrimitiveCodecs) RegisterPrimitiveCodecs added in v0.0.17 

func (pc PrimitiveCodecs) RegisterPrimitiveCodecs(rb *bsoncodec.RegistryBuilder)

RegisterPrimitiveCodecs will register the encode and decode methods attached to PrimitiveCodecs with the provided RegistryBuilder. if rb is nil, a new empty RegistryBuilder will be created.

type Raw added in v0.0.18 

type Raw []byte

Raw is a wrapper around a byte slice. It will interpret the slice as a BSON document. This type is a wrapper around a bsoncore.Document. Errors returned from the methods on this type and associated types come from the bsoncore package.

func NewFromIOReader 

func NewFromIOReader(r io.Reader) (Raw, error)

NewFromIOReader reads in a document from the given io.Reader and constructs a Raw from it.

func (Raw) Elements added in v0.0.18 

func (r Raw) Elements() ([]RawElement, error)

Elements returns this document as a slice of elements. The returned slice will contain valid elements. If the document is not valid, the elements up to the invalid point will be returned along with an error.

func (Raw) Index added in v0.0.18 

func (r Raw) Index(index uint) RawElement

Index searches for and retrieves the element at the given index. This method will panic if the document is invalid or if the index is out of bounds.

func (Raw) IndexErr added in v0.0.18 

func (r Raw) IndexErr(index uint) (RawElement, error)

IndexErr searches for and retrieves the element at the given index.

func (Raw) Lookup added in v0.0.18 

func (r Raw) Lookup(key ...string) RawValue

Lookup search the document, potentially recursively, for the given key. If there are multiple keys provided, this method will recurse down, as long as the top and intermediate nodes are either documents or arrays.If an error occurs or if the value doesn't exist, an empty RawValue is returned.

func (Raw) LookupErr added in v0.0.18 

func (r Raw) LookupErr(key ...string) (RawValue, error)

LookupErr searches the document and potentially subdocuments or arrays for the provided key. Each key provided to this method represents a layer of depth.

func (Raw) String added in v0.0.18 

func (r Raw) String() string

String implements the fmt.Stringer interface.

func (Raw) Validate added in v0.0.18 

func (r Raw) Validate() (err error)

Validate validates the document. This method only validates the first document in the slice, to validate other documents, the slice must be resliced.

Example 
rdr := make(Raw, 500)
rdr[250], rdr[251], rdr[252], rdr[253], rdr[254] = '\x05', '\x00', '\x00', '\x00', '\x00'
err := rdr[250:].Validate()
fmt.Println(err)

Output:

<nil>

func (Raw) Values added in v0.0.18 

func (r Raw) Values() ([]RawValue, error)

Values returns this document as a slice of values. The returned slice will contain valid values. If the document is not valid, the values up to the invalid point will be returned along with an error.

type RawElement added in v0.0.18 

type RawElement []byte

RawElement represents a BSON element in byte form. This type provides a simple way to transform a slice of bytes into a BSON element and extract information from it.

RawElement is a thin wrapper around a bsoncore.Element.

func (RawElement) DebugString added in v0.0.18 

func (re RawElement) DebugString() string

DebugString outputs a human readable version of RawElement. It will attempt to stringify the valid components of the element even if the entire element is not valid.

func (RawElement) Key added in v0.0.18 

func (re RawElement) Key() string

Key returns the key for this element. If the element is not valid, this method returns an empty string. If knowing if the element is valid is important, use KeyErr.

func (RawElement) KeyErr added in v0.0.18 

func (re RawElement) KeyErr() (string, error)

KeyErr returns the key for this element, returning an error if the element is not valid.

func (RawElement) String added in v0.0.18 

func (re RawElement) String() string

String implements the fmt.Stringer interface. The output will be in extended JSON format.

func (RawElement) Validate added in v0.0.18 

func (re RawElement) Validate() error

Validate ensures re is a valid BSON element.

func (RawElement) Value added in v0.0.18 

func (re RawElement) Value() RawValue

Value returns the value of this element. If the element is not valid, this method returns an empty Value. If knowing if the element is valid is important, use ValueErr.

func (RawElement) ValueErr added in v0.0.18 

func (re RawElement) ValueErr() (RawValue, error)

ValueErr returns the value for this element, returning an error if the element is not valid.

type RawValue added in v0.0.18 

type RawValue struct {
	Type  bsontype.Type
	Value []byte
	// contains filtered or unexported fields
}

RawValue represents a BSON value in byte form. It can be used to hold unprocessed BSON or to defer processing of BSON. Type is the BSON type of the value and Value are the raw bytes that represent the element.

This type wraps bsoncore.Value for most of it's functionality.

func (RawValue) Array added in v0.0.18 

func (rv RawValue) Array() Raw

Array returns the BSON array the Value represents as an Array. It panics if the value is a BSON type other than array.

func (RawValue) ArrayOK added in v0.0.18 

func (rv RawValue) ArrayOK() (Raw, bool)

ArrayOK is the same as Array, except it returns a boolean instead of panicking.

func (RawValue) Binary added in v0.0.18 

func (rv RawValue) Binary() (subtype byte, data []byte)

Binary returns the BSON binary value the Value represents. It panics if the value is a BSON type other than binary.

func (RawValue) BinaryOK added in v0.0.18 

func (rv RawValue) BinaryOK() (subtype byte, data []byte, ok bool)

BinaryOK is the same as Binary, except it returns a boolean instead of panicking.

func (RawValue) Boolean added in v0.0.18 

func (rv RawValue) Boolean() bool

Boolean returns the boolean value the Value represents. It panics if the value is a BSON type other than boolean.

func (RawValue) BooleanOK added in v0.0.18 

func (rv RawValue) BooleanOK() (bool, bool)

BooleanOK is the same as Boolean, except it returns a boolean instead of panicking.

func (RawValue) CodeWithScope added in v0.0.18 

func (rv RawValue) CodeWithScope() (string, Raw)

CodeWithScope returns the BSON JavaScript code with scope the Value represents. It panics if the value is a BSON type other than JavaScript code with scope.

func (RawValue) CodeWithScopeOK added in v0.0.18 

func (rv RawValue) CodeWithScopeOK() (string, Raw, bool)

CodeWithScopeOK is the same as CodeWithScope, except that it returns a boolean instead of panicking.

func (RawValue) DBPointer added in v0.0.18 

func (rv RawValue) DBPointer() (string, primitive.ObjectID)

DBPointer returns the BSON dbpointer value the Value represents. It panics if the value is a BSON type other than DBPointer.

func (RawValue) DBPointerOK added in v0.0.18 

func (rv RawValue) DBPointerOK() (string, primitive.ObjectID, bool)

DBPointerOK is the same as DBPoitner, except that it returns a boolean instead of panicking.

func (RawValue) DateTime added in v0.0.18 

func (rv RawValue) DateTime() int64

DateTime returns the BSON datetime value the Value represents as a unix timestamp. It panics if the value is a BSON type other than datetime.

func (RawValue) DateTimeOK added in v0.0.18 

func (rv RawValue) DateTimeOK() (int64, bool)

DateTimeOK is the same as DateTime, except it returns a boolean instead of panicking.

func (RawValue) DebugString added in v0.0.18 

func (rv RawValue) DebugString() string

DebugString outputs a human readable version of Document. It will attempt to stringify the valid components of the document even if the entire document is not valid.

func (RawValue) Decimal128 added in v0.0.18 

func (rv RawValue) Decimal128() primitive.Decimal128

Decimal128 returns the decimal the Value represents. It panics if the value is a BSON type other than decimal.

func (RawValue) Decimal128OK added in v0.0.18 

func (rv RawValue) Decimal128OK() (primitive.Decimal128, bool)

Decimal128OK is the same as Decimal128, except that it returns a boolean instead of panicking.

func (RawValue) Document added in v0.0.18 

func (rv RawValue) Document() Raw

Document returns the BSON document the Value represents as a Document. It panics if the value is a BSON type other than document.

func (RawValue) DocumentOK added in v0.0.18 

func (rv RawValue) DocumentOK() (Raw, bool)

DocumentOK is the same as Document, except it returns a boolean instead of panicking.

func (RawValue) Double added in v0.0.18 

func (rv RawValue) Double() float64

Double returns the float64 value for this element. It panics if e's BSON type is not bsontype.Double.

func (RawValue) DoubleOK added in v0.0.18 

func (rv RawValue) DoubleOK() (float64, bool)

DoubleOK is the same as Double, but returns a boolean instead of panicking.

func (RawValue) Equal added in v0.0.18 

func (rv RawValue) Equal(rv2 RawValue) bool

Equal compares rv and rv2 and returns true if they are equal.

func (RawValue) Int32 added in v0.0.18 

func (rv RawValue) Int32() int32

Int32 returns the int32 the Value represents. It panics if the value is a BSON type other than int32.

func (RawValue) Int32OK added in v0.0.18 

func (rv RawValue) Int32OK() (int32, bool)

Int32OK is the same as Int32, except that it returns a boolean instead of panicking.

func (RawValue) Int64 added in v0.0.18 

func (rv RawValue) Int64() int64

Int64 returns the int64 the Value represents. It panics if the value is a BSON type other than int64.

func (RawValue) Int64OK added in v0.0.18 

func (rv RawValue) Int64OK() (int64, bool)

Int64OK is the same as Int64, except that it returns a boolean instead of panicking.

func (RawValue) IsNumber added in v0.0.18 

func (rv RawValue) IsNumber() bool

IsNumber returns true if the type of v is a numeric BSON type.

func (RawValue) JavaScript added in v0.0.18 

func (rv RawValue) JavaScript() string

JavaScript returns the BSON JavaScript code value the Value represents. It panics if the value is a BSON type other than JavaScript code.

func (RawValue) JavaScriptOK added in v0.0.18 

func (rv RawValue) JavaScriptOK() (string, bool)

JavaScriptOK is the same as Javascript, excepti that it returns a boolean instead of panicking.

func (RawValue) ObjectID added in v0.0.18 

func (rv RawValue) ObjectID() primitive.ObjectID

ObjectID returns the BSON objectid value the Value represents. It panics if the value is a BSON type other than objectid.

func (RawValue) ObjectIDOK added in v0.0.18 

func (rv RawValue) ObjectIDOK() (primitive.ObjectID, bool)

ObjectIDOK is the same as ObjectID, except it returns a boolean instead of panicking.

func (RawValue) Regex added in v0.0.18 

func (rv RawValue) Regex() (pattern, options string)

Regex returns the BSON regex value the Value represents. It panics if the value is a BSON type other than regex.

func (RawValue) RegexOK added in v0.0.18 

func (rv RawValue) RegexOK() (pattern, options string, ok bool)

RegexOK is the same as Regex, except it returns a boolean instead of panicking.

func (RawValue) String added in v0.0.18 

func (rv RawValue) String() string

String implements the fmt.String interface. This method will return values in extended JSON format. If the value is not valid, this returns an empty string

func (RawValue) StringValue added in v0.0.18 

func (rv RawValue) StringValue() string

StringValue returns the string value for this element. It panics if e's BSON type is not bsontype.String.

NOTE: This method is called StringValue to avoid a collision with the String method which implements the fmt.Stringer interface.

func (RawValue) StringValueOK added in v0.0.18 

func (rv RawValue) StringValueOK() (string, bool)

StringValueOK is the same as StringValue, but returns a boolean instead of panicking.

func (RawValue) Symbol added in v0.0.18 

func (rv RawValue) Symbol() string

Symbol returns the BSON symbol value the Value represents. It panics if the value is a BSON type other than symbol.

func (RawValue) SymbolOK added in v0.0.18 

func (rv RawValue) SymbolOK() (string, bool)

SymbolOK is the same as Symbol, excepti that it returns a boolean instead of panicking.

func (RawValue) Time added in v0.0.18 

func (rv RawValue) Time() time.Time

Time returns the BSON datetime value the Value represents. It panics if the value is a BSON type other than datetime.

func (RawValue) TimeOK added in v0.0.18 

func (rv RawValue) TimeOK() (time.Time, bool)

TimeOK is the same as Time, except it returns a boolean instead of panicking.

func (RawValue) Timestamp added in v0.0.18 

func (rv RawValue) Timestamp() (t, i uint32)

Timestamp returns the BSON timestamp value the Value represents. It panics if the value is a BSON type other than timestamp.

func (RawValue) TimestampOK added in v0.0.18 

func (rv RawValue) TimestampOK() (t, i uint32, ok bool)

TimestampOK is the same as Timestamp, except that it returns a boolean instead of panicking.

func (RawValue) Unmarshal added in v0.0.18 

func (rv RawValue) Unmarshal(val interface{}) error

Unmarshal deserializes BSON into the provided val. If RawValue cannot be unmarshaled into val, an error is returned. This method will use the registry used to create the RawValue, if the RawValue was created from partial BSON processing, or it will use the default registry. Users wishing to specify the registry to use should use UnmarshalWithRegistry.

func (RawValue) UnmarshalWithContext added in v0.2.0 

func (rv RawValue) UnmarshalWithContext(dc *bsoncodec.DecodeContext, val interface{}) error

UnmarshalWithContext performs the same unmarshalling as Unmarshal but uses the provided DecodeContext instead of the one attached or the default registry.

func (RawValue) UnmarshalWithRegistry added in v0.0.18 

func (rv RawValue) UnmarshalWithRegistry(r *bsoncodec.Registry, val interface{}) error

UnmarshalWithRegistry performs the same unmarshalling as Unmarshal but uses the provided registry instead of the one attached or the default registry.

func (RawValue) Validate added in v0.0.18 

func (rv RawValue) Validate() error

Validate ensures the value is a valid BSON value.

type Unmarshaler 

type Unmarshaler interface {
	UnmarshalBSON([]byte) error
}

Unmarshaler is an interface implemented by types that can unmarshal a BSON document representation of themselves. The BSON bytes can be assumed to be valid. UnmarshalBSON must copy the BSON bytes if it wishes to retain the data after returning.

type ValueMarshaler 

type ValueMarshaler interface {
	MarshalBSONValue() (bsontype.Type, []byte, error)
}

ValueMarshaler is an interface implemented by types that can marshal themselves into a BSON value as bytes. The type must be the valid type for the bytes returned. The bytes and byte type together must be valid if the error is nil.

type ValueUnmarshaler added in v0.0.17 

type ValueUnmarshaler interface {
	UnmarshalBSONValue(bsontype.Type, []byte) error
}

ValueUnmarshaler is an interface implemented by types that can unmarshal a BSON value representaiton of themselves. The BSON bytes and type can be assumed to be valid. UnmarshalBSONValue must copy the BSON value bytes if it wishes to retain the data after returning.

type Zeroer added in v0.0.4 

type Zeroer interface {
	IsZero() bool
}

Zeroer allows custom struct types to implement a report of zero state. All struct types that don't implement Zeroer or where IsZero returns false are considered to be not zero.

Source Files

View all Source files

Directories

Path Synopsis
Package bsoncodec provides a system for encoding values to BSON representations and decoding values from BSON representations.
 Package bsoncodec provides a system for encoding values to BSON representations and decoding values from BSON representations.
Package bsonrw contains abstractions for reading and writing BSON and BSON like types from sources.
 Package bsonrw contains abstractions for reading and writing BSON and BSON like types from sources.
bsonrwtest
Package bsontype is a utility package that contains types for each BSON type and the a stringifier for the Type to enable easier debugging when working with BSON.
 Package bsontype is a utility package that contains types for each BSON type and the a stringifier for the Type to enable easier debugging when working with BSON.
Package mgocompat provides Registry, a BSON registry compatible with globalsign/mgo's BSON, with some remaining differences.
 Package mgocompat provides Registry, a BSON registry compatible with globalsign/mgo's BSON, with some remaining differences.
Package primitive contains types similar to Go primitives for BSON types can do not have direct Go primitive representations.
 Package primitive contains types similar to Go primitives for BSON types can do not have direct Go primitive representations.

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