diff --git a/sdk/telemetry/attr.go b/sdk/telemetry/attr.go new file mode 100644 index 000000000..af6ef171f --- /dev/null +++ b/sdk/telemetry/attr.go @@ -0,0 +1,58 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +package telemetry + +// Attr is a key-value pair. +type Attr struct { + Key string `json:"key,omitempty"` + Value Value `json:"value,omitempty"` +} + +// String returns an Attr for a string value. +func String(key, value string) Attr { + return Attr{key, StringValue(value)} +} + +// Int64 returns an Attr for an int64 value. +func Int64(key string, value int64) Attr { + return Attr{key, Int64Value(value)} +} + +// Int returns an Attr for an int value. +func Int(key string, value int) Attr { + return Int64(key, int64(value)) +} + +// Float64 returns an Attr for a float64 value. +func Float64(key string, value float64) Attr { + return Attr{key, Float64Value(value)} +} + +// Bool returns an Attr for a bool value. +func Bool(key string, value bool) Attr { + return Attr{key, BoolValue(value)} +} + +// Bytes returns an Attr for a []byte value. +// The passed slice must not be changed after it is passed. +func Bytes(key string, value []byte) Attr { + return Attr{key, BytesValue(value)} +} + +// Slice returns an Attr for a []Value value. +// The passed slice must not be changed after it is passed. +func Slice(key string, value ...Value) Attr { + return Attr{key, SliceValue(value...)} +} + +// Map returns an Attr for a map value. +// The passed slice must not be changed after it is passed. +func Map(key string, value ...Attr) Attr { + return Attr{key, MapValue(value...)} +} + +// Equal returns if a is equal to b. +func (a Attr) Equal(b Attr) bool { + return a.Key == b.Key && a.Value.Equal(b.Value) +} diff --git a/sdk/telemetry/attr_test.go b/sdk/telemetry/attr_test.go new file mode 100644 index 000000000..be1632349 --- /dev/null +++ b/sdk/telemetry/attr_test.go @@ -0,0 +1,38 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +package telemetry + +import ( + "encoding/json" + "testing" + + "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" +) + +var ( + decoded = []Attr{ + String("user", "Alice"), + Bool("admin", true), + Int64("floor", -2), + Float64("impact", 0.21362), + Slice("reports", StringValue("Bob"), StringValue("Dave")), + Map("favorites", String("food", "hot dog"), Int("number", 13)), + Bytes("secret", []byte("NUI4RUZGRjc5ODAzODEwM0QyNjlCNjMzODEzRkM2MEM=")), + } + + encoded = []byte(`[{"key":"user","value":{"stringValue":"Alice"}},{"key":"admin","value":{"boolValue":true}},{"key":"floor","value":{"intValue":"-2"}},{"key":"impact","value":{"doubleValue":0.21362}},{"key":"reports","value":{"arrayValue":{"values":[{"stringValue":"Bob"},{"stringValue":"Dave"}]}}},{"key":"favorites","value":{"kvlistValue":{"values":[{"key":"food","value":{"stringValue":"hot dog"}},{"key":"number","value":{"intValue":"13"}}]}}},{"key":"secret","value":{"bytesValue":"TlVJNFJVWkdSamM1T0RBek9ERXdNMFF5TmpsQ05qTXpPREV6UmtNMk1FTT0="}}]`) +) + +func TestAttrUnmarshal(t *testing.T) { + var got []Attr + require.NoError(t, json.Unmarshal(encoded, &got)) + assert.Equal(t, decoded, got) +} + +func TestAttrMarshal(t *testing.T) { + got, err := json.Marshal(decoded) + require.NoError(t, err) + assert.Equal(t, string(encoded), string(got)) +} diff --git a/sdk/telemetry/bench_test.go b/sdk/telemetry/bench_test.go new file mode 100644 index 000000000..c3e73a5cf --- /dev/null +++ b/sdk/telemetry/bench_test.go @@ -0,0 +1,70 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +package telemetry + +import ( + "bytes" + "encoding/json" + "testing" + "time" +) + +var ( + traceID = [16]byte{0x1} + + spanID1 = [8]byte{0x1} + spanID2 = [8]byte{0x2} + + now = time.Now() + nowPlus1 = now.Add(1 * time.Second) + + spanA = &Span{ + TraceID: traceID, + SpanID: spanID2, + ParentSpanID: spanID1, + Flags: 1, + Name: "span-a", + StartTime: now, + EndTime: nowPlus1, + Status: &Status{ + Message: "test status", + Code: StatusCodeOK, + }, + } + + spanB = &Span{} + + scopeSpans = &ScopeSpans{ + Scope: &Scope{ + Name: "TestTracer", + Version: "v0.1.0", + }, + SchemaURL: "http://go.opentelemetry.io/test", + Spans: []*Span{spanA, spanB}, + } +) + +func BenchmarkJSONMarshalUnmarshal(b *testing.B) { + var out ScopeSpans + + b.ReportAllocs() + b.ResetTimer() + for n := 0; n < b.N; n++ { + var inBuf bytes.Buffer + enc := json.NewEncoder(&inBuf) + err := enc.Encode(scopeSpans) + if err != nil { + b.Fatal(err) + } + + payload := inBuf.Bytes() + + dec := json.NewDecoder(bytes.NewReader(payload)) + err = dec.Decode(&out) + if err != nil { + b.Fatal(err) + } + } + _ = out +} diff --git a/sdk/telemetry/doc.go b/sdk/telemetry/doc.go new file mode 100644 index 000000000..949e2165c --- /dev/null +++ b/sdk/telemetry/doc.go @@ -0,0 +1,8 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +/* +Package telemetry provides a lightweight representations of OpenTelemetry +telemetry that is compatible with the OTLP JSON protobuf encoding. +*/ +package telemetry diff --git a/sdk/telemetry/id.go b/sdk/telemetry/id.go new file mode 100644 index 000000000..7245d9fbb --- /dev/null +++ b/sdk/telemetry/id.go @@ -0,0 +1,119 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +package telemetry + +import ( + "encoding/hex" + "errors" + "fmt" +) + +const ( + traceIDSize = 16 + spanIDSize = 8 +) + +// TraceID is a custom data type that is used for all trace IDs. +type TraceID [traceIDSize]byte + +// String returns the hex string representation form of a TraceID. +func (tid TraceID) String() string { + return hex.EncodeToString(tid[:]) +} + +// Size returns the size of the data to serialize. +func (tid TraceID) Size() int { + if tid.IsEmpty() { + return 0 + } + return traceIDSize +} + +// IsEmpty returns false if id contains at least one non-zero byte. +func (tid TraceID) IsEmpty() bool { + return tid == [traceIDSize]byte{} +} + +// MarshalJSON converts the trace ID into a hex string enclosed in quotes. +func (tid TraceID) MarshalJSON() ([]byte, error) { + if tid.IsEmpty() { + return []byte(`""`), nil + } + return marshalJSON(tid[:]) +} + +// UnmarshalJSON inflates the trace ID from hex string, possibly enclosed in +// quotes. +func (tid *TraceID) UnmarshalJSON(data []byte) error { + *tid = [traceIDSize]byte{} + return unmarshalJSON(tid[:], data) +} + +// SpanID is a custom data type that is used for all span IDs. +type SpanID [spanIDSize]byte + +// String returns the hex string representation form of a SpanID. +func (sid SpanID) String() string { + return hex.EncodeToString(sid[:]) +} + +// Size returns the size of the data to serialize. +func (sid SpanID) Size() int { + if sid.IsEmpty() { + return 0 + } + return spanIDSize +} + +// IsEmpty returns true if the span ID contains at least one non-zero byte. +func (sid SpanID) IsEmpty() bool { + return sid == [spanIDSize]byte{} +} + +// MarshalJSON converts span ID into a hex string enclosed in quotes. +func (sid SpanID) MarshalJSON() ([]byte, error) { + if sid.IsEmpty() { + return []byte(`""`), nil + } + return marshalJSON(sid[:]) +} + +// UnmarshalJSON decodes span ID from hex string, possibly enclosed in quotes. +func (sid *SpanID) UnmarshalJSON(data []byte) error { + *sid = [spanIDSize]byte{} + return unmarshalJSON(sid[:], data) +} + +// marshalJSON converts id into a hex string enclosed in quotes. +func marshalJSON(id []byte) ([]byte, error) { + // Plus 2 quote chars at the start and end. + hexLen := hex.EncodedLen(len(id)) + 2 + + b := make([]byte, hexLen) + hex.Encode(b[1:hexLen-1], id) + b[0], b[hexLen-1] = '"', '"' + + return b, nil +} + +// unmarshalJSON inflates trace id from hex string, possibly enclosed in quotes. +func unmarshalJSON(dst []byte, src []byte) error { + if l := len(src); l >= 2 && src[0] == '"' && src[l-1] == '"' { + src = src[1 : l-1] + } + nLen := len(src) + if nLen == 0 { + return nil + } + + if len(dst) != hex.DecodedLen(nLen) { + return errors.New("invalid length for ID") + } + + _, err := hex.Decode(dst, src) + if err != nil { + return fmt.Errorf("cannot unmarshal ID from string '%s': %w", string(src), err) + } + return nil +} diff --git a/sdk/telemetry/number.go b/sdk/telemetry/number.go new file mode 100644 index 000000000..29e629d66 --- /dev/null +++ b/sdk/telemetry/number.go @@ -0,0 +1,67 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +package telemetry + +import ( + "encoding/json" + "strconv" +) + +// protoInt64 represents the protobuf encoding of integers which can be either +// strings or integers. +type protoInt64 int64 + +// Int64 returns the protoInt64 as an int64. +func (i *protoInt64) Int64() int64 { return int64(*i) } + +// UnmarshalJSON decodes both strings and integers. +func (i *protoInt64) UnmarshalJSON(data []byte) error { + if data[0] == '"' { + var str string + if err := json.Unmarshal(data, &str); err != nil { + return err + } + parsedInt, err := strconv.ParseInt(str, 10, 64) + if err != nil { + return err + } + *i = protoInt64(parsedInt) + } else { + var parsedInt int64 + if err := json.Unmarshal(data, &parsedInt); err != nil { + return err + } + *i = protoInt64(parsedInt) + } + return nil +} + +// protoUint64 represents the protobuf encoding of integers which can be either +// strings or integers. +type protoUint64 uint64 + +// Int64 returns the protoUint64 as a uint64. +func (i *protoUint64) Uint64() uint64 { return uint64(*i) } + +// UnmarshalJSON decodes both strings and integers. +func (i *protoUint64) UnmarshalJSON(data []byte) error { + if data[0] == '"' { + var str string + if err := json.Unmarshal(data, &str); err != nil { + return err + } + parsedUint, err := strconv.ParseUint(str, 10, 64) + if err != nil { + return err + } + *i = protoUint64(parsedUint) + } else { + var parsedUint uint64 + if err := json.Unmarshal(data, &parsedUint); err != nil { + return err + } + *i = protoUint64(parsedUint) + } + return nil +} diff --git a/sdk/telemetry/resource.go b/sdk/telemetry/resource.go new file mode 100644 index 000000000..cecad8bae --- /dev/null +++ b/sdk/telemetry/resource.go @@ -0,0 +1,66 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +package telemetry + +import ( + "bytes" + "encoding/json" + "errors" + "fmt" + "io" +) + +// Resource information. +type Resource struct { + // Attrs are the set of attributes that describe the resource. Attribute + // keys MUST be unique (it is not allowed to have more than one attribute + // with the same key). + Attrs []Attr `json:"attributes,omitempty"` + // DroppedAttrs is the number of dropped attributes. If the value + // is 0, then no attributes were dropped. + DroppedAttrs uint32 `json:"droppedAttributesCount,omitempty"` +} + +// UnmarshalJSON decodes the OTLP formatted JSON contained in data into r. +func (r *Resource) UnmarshalJSON(data []byte) error { + decoder := json.NewDecoder(bytes.NewReader(data)) + + t, err := decoder.Token() + if err != nil { + return err + } + if t != json.Delim('{') { + return errors.New("invalid Resource type") + } + + for decoder.More() { + keyIface, err := decoder.Token() + if err != nil { + if errors.Is(err, io.EOF) { + // Empty. + return nil + } + return err + } + + key, ok := keyIface.(string) + if !ok { + return fmt.Errorf("invalid Resource field: %#v", keyIface) + } + + switch key { + case "attributes": + err = decoder.Decode(&r.Attrs) + case "droppedAttributesCount", "dropped_attributes_count": + err = decoder.Decode(&r.DroppedAttrs) + default: + // Skip unknown. + } + + if err != nil { + return err + } + } + return nil +} diff --git a/sdk/telemetry/scope.go b/sdk/telemetry/scope.go new file mode 100644 index 000000000..d6381d841 --- /dev/null +++ b/sdk/telemetry/scope.go @@ -0,0 +1,12 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +package telemetry + +// Scope is the identifying values of the instrumentation scope. +type Scope struct { + Name string `json:"name,omitempty"` + Version string `json:"version,omitempty"` + Attrs []Attr `json:"attributes,omitempty"` + DroppedAttrs uint32 `json:"droppedAttributesCount,omitempty"` +} diff --git a/sdk/telemetry/span.go b/sdk/telemetry/span.go new file mode 100644 index 000000000..4cb4dca14 --- /dev/null +++ b/sdk/telemetry/span.go @@ -0,0 +1,428 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +package telemetry + +import ( + "bytes" + "encoding/json" + "errors" + "fmt" + "io" + "time" +) + +// A Span represents a single operation performed by a single component of the +// system. +type Span struct { + // A unique identifier for a trace. All spans from the same trace share + // the same `trace_id`. The ID is a 16-byte array. An ID with all zeroes OR + // of length other than 16 bytes is considered invalid (empty string in OTLP/JSON + // is zero-length and thus is also invalid). + // + // This field is required. + TraceID TraceID `json:"traceId,omitempty"` + // A unique identifier for a span within a trace, assigned when the span + // is created. The ID is an 8-byte array. An ID with all zeroes OR of length + // other than 8 bytes is considered invalid (empty string in OTLP/JSON + // is zero-length and thus is also invalid). + // + // This field is required. + SpanID SpanID `json:"spanId,omitempty"` + // trace_state conveys information about request position in multiple distributed tracing graphs. + // It is a trace_state in w3c-trace-context format: https://www.w3.org/TR/trace-context/#tracestate-header + // See also https://github.com/w3c/distributed-tracing for more details about this field. + TraceState string `json:"traceState,omitempty"` + // The `span_id` of this span's parent span. If this is a root span, then this + // field must be empty. The ID is an 8-byte array. + ParentSpanID SpanID `json:"parentSpanId,omitempty"` + // Flags, a bit field. + // + // Bits 0-7 (8 least significant bits) are the trace flags as defined in W3C Trace + // Context specification. To read the 8-bit W3C trace flag, use + // `flags & SPAN_FLAGS_TRACE_FLAGS_MASK`. + // + // See https://www.w3.org/TR/trace-context-2/#trace-flags for the flag definitions. + // + // Bits 8 and 9 represent the 3 states of whether a span's parent + // is remote. The states are (unknown, is not remote, is remote). + // To read whether the value is known, use `(flags & SPAN_FLAGS_CONTEXT_HAS_IS_REMOTE_MASK) != 0`. + // To read whether the span is remote, use `(flags & SPAN_FLAGS_CONTEXT_IS_REMOTE_MASK) != 0`. + // + // When creating span messages, if the message is logically forwarded from another source + // with an equivalent flags fields (i.e., usually another OTLP span message), the field SHOULD + // be copied as-is. If creating from a source that does not have an equivalent flags field + // (such as a runtime representation of an OpenTelemetry span), the high 22 bits MUST + // be set to zero. + // Readers MUST NOT assume that bits 10-31 (22 most significant bits) will be zero. + // + // [Optional]. + Flags uint32 `json:"flags,omitempty"` + // A description of the span's operation. + // + // For example, the name can be a qualified method name or a file name + // and a line number where the operation is called. A best practice is to use + // the same display name at the same call point in an application. + // This makes it easier to correlate spans in different traces. + // + // This field is semantically required to be set to non-empty string. + // Empty value is equivalent to an unknown span name. + // + // This field is required. + Name string `json:"name,omitempty"` + // Distinguishes between spans generated in a particular context. For example, + // two spans with the same name may be distinguished using `CLIENT` (caller) + // and `SERVER` (callee) to identify queueing latency associated with the span. + Kind SpanKind `json:"kind,omitempty"` + // start_time_unix_nano is the start time of the span. On the client side, this is the time + // kept by the local machine where the span execution starts. On the server side, this + // is the time when the server's application handler starts running. + // Value is UNIX Epoch time in nanoseconds since 00:00:00 UTC on 1 January 1970. + // + // This field is semantically required and it is expected that end_time >= start_time. + StartTime time.Time `json:"startTimeUnixNano,omitempty"` + // end_time_unix_nano is the end time of the span. On the client side, this is the time + // kept by the local machine where the span execution ends. On the server side, this + // is the time when the server application handler stops running. + // Value is UNIX Epoch time in nanoseconds since 00:00:00 UTC on 1 January 1970. + // + // This field is semantically required and it is expected that end_time >= start_time. + EndTime time.Time `json:"endTimeUnixNano,omitempty"` + // attributes is a collection of key/value pairs. Note, global attributes + // like server name can be set using the resource API. Examples of attributes: + // + // "/http/user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36" + // "/http/server_latency": 300 + // "example.com/myattribute": true + // "example.com/score": 10.239 + // + // The OpenTelemetry API specification further restricts the allowed value types: + // https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/common/README.md#attribute + // Attribute keys MUST be unique (it is not allowed to have more than one + // attribute with the same key). + Attrs []Attr `json:"attributes,omitempty"` + // dropped_attributes_count is the number of attributes that were discarded. Attributes + // can be discarded because their keys are too long or because there are too many + // attributes. If this value is 0, then no attributes were dropped. + DroppedAttrs uint32 `json:"droppedAttributesCount,omitempty"` + // events is a collection of Event items. + Events []*SpanEvent `json:"events,omitempty"` + // dropped_events_count is the number of dropped events. If the value is 0, then no + // events were dropped. + DroppedEvents uint32 `json:"droppedEventsCount,omitempty"` + // links is a collection of Links, which are references from this span to a span + // in the same or different trace. + Links []*SpanLink `json:"links,omitempty"` + // dropped_links_count is the number of dropped links after the maximum size was + // enforced. If this value is 0, then no links were dropped. + DroppedLinks uint32 `json:"droppedLinksCount,omitempty"` + // An optional final status for this span. Semantically when Status isn't set, it means + // span's status code is unset, i.e. assume STATUS_CODE_UNSET (code = 0). + Status *Status `json:"status,omitempty"` +} + +// MarshalJSON encodes s into OTLP formatted JSON. +func (s Span) MarshalJSON() ([]byte, error) { + type Alias Span + return json.Marshal(struct { + Alias + StartTime uint64 `json:"startTimeUnixNano,omitempty"` + EndTime uint64 `json:"endTimeUnixNano,omitempty"` + }{ + Alias: Alias(s), + StartTime: uint64(s.StartTime.UnixNano()), + EndTime: uint64(s.EndTime.UnixNano()), + }) +} + +// UnmarshalJSON decodes the OTLP formatted JSON contained in data into s. +func (s *Span) UnmarshalJSON(data []byte) error { + decoder := json.NewDecoder(bytes.NewReader(data)) + + t, err := decoder.Token() + if err != nil { + return err + } + if t != json.Delim('{') { + return errors.New("invalid Span type") + } + + for decoder.More() { + keyIface, err := decoder.Token() + if err != nil { + if errors.Is(err, io.EOF) { + // Empty. + return nil + } + return err + } + + key, ok := keyIface.(string) + if !ok { + return fmt.Errorf("invalid Span field: %#v", keyIface) + } + + switch key { + case "traceId", "trace_id": + err = decoder.Decode(&s.TraceID) + case "spanId", "span_id": + err = decoder.Decode(&s.SpanID) + case "traceState", "trace_state": + err = decoder.Decode(&s.TraceState) + case "parentSpanId", "parent_span_id": + err = decoder.Decode(&s.ParentSpanID) + case "flags": + err = decoder.Decode(&s.Flags) + case "name": + err = decoder.Decode(&s.Name) + case "kind": + err = decoder.Decode(&s.Kind) + case "startTimeUnixNano", "start_time_unix_nano": + var val protoUint64 + err = decoder.Decode(&val) + s.StartTime = time.Unix(0, int64(val.Uint64())) + case "endTimeUnixNano", "end_time_unix_nano": + var val protoUint64 + err = decoder.Decode(&val) + s.EndTime = time.Unix(0, int64(val.Uint64())) + case "attributes": + err = decoder.Decode(&s.Attrs) + case "droppedAttributesCount", "dropped_attributes_count": + err = decoder.Decode(&s.DroppedAttrs) + case "events": + err = decoder.Decode(&s.Events) + case "droppedEventsCount", "dropped_events_count": + err = decoder.Decode(&s.DroppedEvents) + case "links": + err = decoder.Decode(&s.Links) + case "droppedLinksCount", "dropped_links_count": + err = decoder.Decode(&s.DroppedLinks) + case "status": + err = decoder.Decode(&s.Status) + default: + // Skip unknown. + } + + if err != nil { + return err + } + } + return nil +} + +// SpanFlags represents constants used to interpret the +// Span.flags field, which is protobuf 'fixed32' type and is to +// be used as bit-fields. Each non-zero value defined in this enum is +// a bit-mask. To extract the bit-field, for example, use an +// expression like: +// +// (span.flags & SPAN_FLAGS_TRACE_FLAGS_MASK) +// +// See https://www.w3.org/TR/trace-context-2/#trace-flags for the flag definitions. +// +// Note that Span flags were introduced in version 1.1 of the +// OpenTelemetry protocol. Older Span producers do not set this +// field, consequently consumers should not rely on the absence of a +// particular flag bit to indicate the presence of a particular feature. +type SpanFlags int32 + +const ( + // Bits 0-7 are used for trace flags. + SpanFlagsTraceFlagsMask SpanFlags = 255 + // Bits 8 and 9 are used to indicate that the parent span or link span is remote. + // Bit 8 (`HAS_IS_REMOTE`) indicates whether the value is known. + // Bit 9 (`IS_REMOTE`) indicates whether the span or link is remote. + SpanFlagsContextHasIsRemoteMask SpanFlags = 256 + // SpanFlagsContextHasIsRemoteMask indicates the Span is remote. + SpanFlagsContextIsRemoteMask SpanFlags = 512 +) + +// SpanKind is the type of span. Can be used to specify additional relationships between spans +// in addition to a parent/child relationship. +type SpanKind int32 + +const ( + // Indicates that the span represents an internal operation within an application, + // as opposed to an operation happening at the boundaries. Default value. + SpanKindInternal SpanKind = 1 + // Indicates that the span covers server-side handling of an RPC or other + // remote network request. + SpanKindServer SpanKind = 2 + // Indicates that the span describes a request to some remote service. + SpanKindClient SpanKind = 3 + // Indicates that the span describes a producer sending a message to a broker. + // Unlike CLIENT and SERVER, there is often no direct critical path latency relationship + // between producer and consumer spans. A PRODUCER span ends when the message was accepted + // by the broker while the logical processing of the message might span a much longer time. + SpanKindProducer SpanKind = 4 + // Indicates that the span describes consumer receiving a message from a broker. + // Like the PRODUCER kind, there is often no direct critical path latency relationship + // between producer and consumer spans. + SpanKindConsumer SpanKind = 5 +) + +// Event is a time-stamped annotation of the span, consisting of user-supplied +// text description and key-value pairs. +type SpanEvent struct { + // time_unix_nano is the time the event occurred. + Time time.Time `json:"timeUnixNano,omitempty"` + // name of the event. + // This field is semantically required to be set to non-empty string. + Name string `json:"name,omitempty"` + // attributes is a collection of attribute key/value pairs on the event. + // Attribute keys MUST be unique (it is not allowed to have more than one + // attribute with the same key). + Attrs []Attr `json:"attributes,omitempty"` + // dropped_attributes_count is the number of dropped attributes. If the value is 0, + // then no attributes were dropped. + DroppedAttrs uint32 `json:"droppedAttributesCount,omitempty"` +} + +// MarshalJSON encodes e into OTLP formatted JSON. +func (e SpanEvent) MarshalJSON() ([]byte, error) { + type Alias SpanEvent + return json.Marshal(struct { + Alias + Time uint64 `json:"timeUnixNano,omitempty"` + }{ + Alias: Alias(e), + Time: uint64(e.Time.UnixNano()), + }) +} + +// UnmarshalJSON decodes the OTLP formatted JSON contained in data into se. +func (se *SpanEvent) UnmarshalJSON(data []byte) error { + decoder := json.NewDecoder(bytes.NewReader(data)) + + t, err := decoder.Token() + if err != nil { + return err + } + if t != json.Delim('{') { + return errors.New("invalid SpanEvent type") + } + + for decoder.More() { + keyIface, err := decoder.Token() + if err != nil { + if errors.Is(err, io.EOF) { + // Empty. + return nil + } + return err + } + + key, ok := keyIface.(string) + if !ok { + return fmt.Errorf("invalid SpanEvent field: %#v", keyIface) + } + + switch key { + case "timeUnixNano", "time_unix_nano": + var val protoUint64 + err = decoder.Decode(&val) + se.Time = time.Unix(0, int64(val.Uint64())) + case "name": + err = decoder.Decode(&se.Name) + case "attributes": + err = decoder.Decode(&se.Attrs) + case "droppedAttributesCount", "dropped_attributes_count": + err = decoder.Decode(&se.DroppedAttrs) + default: + // Skip unknown. + } + + if err != nil { + return err + } + } + return nil +} + +// A pointer from the current span to another span in the same trace or in a +// different trace. For example, this can be used in batching operations, +// where a single batch handler processes multiple requests from different +// traces or when the handler receives a request from a different project. +type SpanLink struct { + // A unique identifier of a trace that this linked span is part of. The ID is a + // 16-byte array. + TraceID TraceID `json:"traceId,omitempty"` + // A unique identifier for the linked span. The ID is an 8-byte array. + SpanID SpanID `json:"spanId,omitempty"` + // The trace_state associated with the link. + TraceState string `json:"traceState,omitempty"` + // attributes is a collection of attribute key/value pairs on the link. + // Attribute keys MUST be unique (it is not allowed to have more than one + // attribute with the same key). + Attrs []Attr `json:"attributes,omitempty"` + // dropped_attributes_count is the number of dropped attributes. If the value is 0, + // then no attributes were dropped. + DroppedAttrs uint32 `json:"droppedAttributesCount,omitempty"` + // Flags, a bit field. + // + // Bits 0-7 (8 least significant bits) are the trace flags as defined in W3C Trace + // Context specification. To read the 8-bit W3C trace flag, use + // `flags & SPAN_FLAGS_TRACE_FLAGS_MASK`. + // + // See https://www.w3.org/TR/trace-context-2/#trace-flags for the flag definitions. + // + // Bits 8 and 9 represent the 3 states of whether the link is remote. + // The states are (unknown, is not remote, is remote). + // To read whether the value is known, use `(flags & SPAN_FLAGS_CONTEXT_HAS_IS_REMOTE_MASK) != 0`. + // To read whether the link is remote, use `(flags & SPAN_FLAGS_CONTEXT_IS_REMOTE_MASK) != 0`. + // + // Readers MUST NOT assume that bits 10-31 (22 most significant bits) will be zero. + // When creating new spans, bits 10-31 (most-significant 22-bits) MUST be zero. + // + // [Optional]. + Flags uint32 `json:"flags,omitempty"` +} + +// UnmarshalJSON decodes the OTLP formatted JSON contained in data into sl. +func (sl *SpanLink) UnmarshalJSON(data []byte) error { + decoder := json.NewDecoder(bytes.NewReader(data)) + + t, err := decoder.Token() + if err != nil { + return err + } + if t != json.Delim('{') { + return errors.New("invalid SpanLink type") + } + + for decoder.More() { + keyIface, err := decoder.Token() + if err != nil { + if errors.Is(err, io.EOF) { + // Empty. + return nil + } + return err + } + + key, ok := keyIface.(string) + if !ok { + return fmt.Errorf("invalid SpanLink field: %#v", keyIface) + } + + switch key { + case "traceId", "trace_id": + err = decoder.Decode(&sl.TraceID) + case "spanId", "span_id": + err = decoder.Decode(&sl.SpanID) + case "traceState", "trace_state": + err = decoder.Decode(&sl.TraceState) + case "attributes": + err = decoder.Decode(&sl.Attrs) + case "droppedAttributesCount", "dropped_attributes_count": + err = decoder.Decode(&sl.DroppedAttrs) + default: + // Skip unknown. + } + + if err != nil { + return err + } + } + return nil +} diff --git a/sdk/telemetry/status.go b/sdk/telemetry/status.go new file mode 100644 index 000000000..1217776ea --- /dev/null +++ b/sdk/telemetry/status.go @@ -0,0 +1,40 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +package telemetry + +// For the semantics of status codes see +// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/api.md#set-status +type StatusCode int32 + +const ( + // The default status. + StatusCodeUnset StatusCode = 0 + // The Span has been validated by an Application developer or Operator to + // have completed successfully. + StatusCodeOK StatusCode = 1 + // The Span contains an error. + StatusCodeError StatusCode = 2 +) + +var statusCodeStrings = []string{ + "Unset", + "OK", + "Error", +} + +func (s StatusCode) String() string { + if s >= 0 && int(s) < len(statusCodeStrings) { + return statusCodeStrings[s] + } + return "" +} + +// The Status type defines a logical error model that is suitable for different +// programming environments, including REST APIs and RPC APIs. +type Status struct { + // A developer-facing human readable error message. + Message string `json:"message,omitempty"` + // The status code. + Code StatusCode `json:"code,omitempty"` +} diff --git a/sdk/telemetry/traces.go b/sdk/telemetry/traces.go new file mode 100644 index 000000000..69a348f0f --- /dev/null +++ b/sdk/telemetry/traces.go @@ -0,0 +1,189 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +package telemetry + +import ( + "bytes" + "encoding/json" + "errors" + "fmt" + "io" +) + +// Traces represents the traces data that can be stored in a persistent storage, +// OR can be embedded by other protocols that transfer OTLP traces data but do +// not implement the OTLP protocol. +// +// The main difference between this message and collector protocol is that +// in this message there will not be any "control" or "metadata" specific to +// OTLP protocol. +// +// When new fields are added into this message, the OTLP request MUST be updated +// as well. +type Traces struct { + // An array of ResourceSpans. + // For data coming from a single resource this array will typically contain + // one element. Intermediary nodes that receive data from multiple origins + // typically batch the data before forwarding further and in that case this + // array will contain multiple elements. + ResourceSpans []*ResourceSpans `json:"resourceSpans,omitempty"` +} + +// UnmarshalJSON decodes the OTLP formatted JSON contained in data into td. +func (td *Traces) UnmarshalJSON(data []byte) error { + decoder := json.NewDecoder(bytes.NewReader(data)) + + t, err := decoder.Token() + if err != nil { + return err + } + if t != json.Delim('{') { + return errors.New("invalid TracesData type") + } + + for decoder.More() { + keyIface, err := decoder.Token() + if err != nil { + if errors.Is(err, io.EOF) { + // Empty. + return nil + } + return err + } + + key, ok := keyIface.(string) + if !ok { + return fmt.Errorf("invalid TracesData field: %#v", keyIface) + } + + switch key { + case "resourceSpans", "resource_spans": + err = decoder.Decode(&td.ResourceSpans) + default: + // Skip unknown. + } + + if err != nil { + return err + } + } + return nil +} + +// A collection of ScopeSpans from a Resource. +type ResourceSpans struct { + // The resource for the spans in this message. + // If this field is not set then no resource info is known. + Resource Resource `json:"resource"` + // A list of ScopeSpans that originate from a resource. + ScopeSpans []*ScopeSpans `json:"scopeSpans,omitempty"` + // This schema_url applies to the data in the "resource" field. It does not apply + // to the data in the "scope_spans" field which have their own schema_url field. + SchemaURL string `json:"schemaUrl,omitempty"` +} + +// UnmarshalJSON decodes the OTLP formatted JSON contained in data into rs. +func (rs *ResourceSpans) UnmarshalJSON(data []byte) error { + decoder := json.NewDecoder(bytes.NewReader(data)) + + t, err := decoder.Token() + if err != nil { + return err + } + if t != json.Delim('{') { + return errors.New("invalid ResourceSpans type") + } + + for decoder.More() { + keyIface, err := decoder.Token() + if err != nil { + if errors.Is(err, io.EOF) { + // Empty. + return nil + } + return err + } + + key, ok := keyIface.(string) + if !ok { + return fmt.Errorf("invalid ResourceSpans field: %#v", keyIface) + } + + switch key { + case "resource": + err = decoder.Decode(&rs.Resource) + case "scopeSpans", "scope_spans": + err = decoder.Decode(&rs.ScopeSpans) + case "schemaUrl", "schema_url": + err = decoder.Decode(&rs.SchemaURL) + default: + // Skip unknown. + } + + if err != nil { + return err + } + } + return nil +} + +// A collection of Spans produced by an InstrumentationScope. +type ScopeSpans struct { + // The instrumentation scope information for the spans in this message. + // Semantically when InstrumentationScope isn't set, it is equivalent with + // an empty instrumentation scope name (unknown). + Scope *Scope `json:"scope"` + // A list of Spans that originate from an instrumentation scope. + Spans []*Span `json:"spans,omitempty"` + // The Schema URL, if known. This is the identifier of the Schema that the span data + // is recorded in. To learn more about Schema URL see + // https://opentelemetry.io/docs/specs/otel/schemas/#schema-url + // This schema_url applies to all spans and span events in the "spans" field. + SchemaURL string `json:"schemaUrl,omitempty"` +} + +// UnmarshalJSON decodes the OTLP formatted JSON contained in data into ss. +func (ss *ScopeSpans) UnmarshalJSON(data []byte) error { + decoder := json.NewDecoder(bytes.NewReader(data)) + + t, err := decoder.Token() + if err != nil { + return err + } + if t != json.Delim('{') { + return errors.New("invalid ScopeSpans type") + } + + for decoder.More() { + keyIface, err := decoder.Token() + if err != nil { + if errors.Is(err, io.EOF) { + // Empty. + return nil + } + return err + } + + key, ok := keyIface.(string) + if !ok { + return fmt.Errorf("invalid ScopeSpans field: %#v", keyIface) + } + + switch key { + case "scope": + err = decoder.Decode(&ss.Scope) + case "spans": + err = decoder.Decode(&ss.Spans) + case "schemaUrl", "schema_url": + err = decoder.Decode(&ss.SchemaURL) + default: + // Skip unknown. + } + + if err != nil { + return err + } + } + return nil +} diff --git a/sdk/telemetry/value.go b/sdk/telemetry/value.go new file mode 100644 index 000000000..0dd01b063 --- /dev/null +++ b/sdk/telemetry/value.go @@ -0,0 +1,452 @@ +// Copyright The OpenTelemetry Authors +// SPDX-License-Identifier: Apache-2.0 + +//go:generate stringer -type=ValueKind -trimprefix=ValueKind + +package telemetry + +import ( + "bytes" + "cmp" + "encoding/base64" + "encoding/json" + "errors" + "fmt" + "io" + "math" + "slices" + "strconv" + "unsafe" +) + +// A Value represents a structured value. +// A zero value is valid and represents an empty value. +type Value struct { + // Ensure forward compatibility by explicitly making this not comparable. + noCmp [0]func() //nolint: unused // This is indeed used. + + // num holds the value for Int64, Float64, and Bool. It holds the length + // for String, Bytes, Slice, Map. + num uint64 + // any holds either the KindBool, KindInt64, KindFloat64, stringptr, + // bytesptr, sliceptr, or mapptr. If KindBool, KindInt64, or KindFloat64 + // then the value of Value is in num as described above. Otherwise, it + // contains the value wrapped in the appropriate type. + any any +} + +type ( + // sliceptr represents a value in Value.any for KindString Values. + stringptr *byte + // bytesptr represents a value in Value.any for KindBytes Values. + bytesptr *byte + // sliceptr represents a value in Value.any for KindSlice Values. + sliceptr *Value + // mapptr represents a value in Value.any for KindMap Values. + mapptr *Attr +) + +// ValueKind is the kind of a [Value]. +type ValueKind int + +// ValueKind values. +const ( + ValueKindEmpty ValueKind = iota + ValueKindBool + ValueKindFloat64 + ValueKindInt64 + ValueKindString + ValueKindBytes + ValueKindSlice + ValueKindMap +) + +var valueKindStrings = []string{ + "Empty", + "Bool", + "Float64", + "Int64", + "String", + "Bytes", + "Slice", + "Map", +} + +func (k ValueKind) String() string { + if k >= 0 && int(k) < len(valueKindStrings) { + return valueKindStrings[k] + } + return "" +} + +// StringValue returns a new [Value] for a string. +func StringValue(v string) Value { + return Value{ + num: uint64(len(v)), + any: stringptr(unsafe.StringData(v)), + } +} + +// IntValue returns a [Value] for an int. +func IntValue(v int) Value { return Int64Value(int64(v)) } + +// Int64Value returns a [Value] for an int64. +func Int64Value(v int64) Value { + return Value{num: uint64(v), any: ValueKindInt64} +} + +// Float64Value returns a [Value] for a float64. +func Float64Value(v float64) Value { + return Value{num: math.Float64bits(v), any: ValueKindFloat64} +} + +// BoolValue returns a [Value] for a bool. +func BoolValue(v bool) Value { //nolint:revive // Not a control flag. + var n uint64 + if v { + n = 1 + } + return Value{num: n, any: ValueKindBool} +} + +// BytesValue returns a [Value] for a byte slice. The passed slice must not be +// changed after it is passed. +func BytesValue(v []byte) Value { + return Value{ + num: uint64(len(v)), + any: bytesptr(unsafe.SliceData(v)), + } +} + +// SliceValue returns a [Value] for a slice of [Value]. The passed slice must +// not be changed after it is passed. +func SliceValue(vs ...Value) Value { + return Value{ + num: uint64(len(vs)), + any: sliceptr(unsafe.SliceData(vs)), + } +} + +// MapValue returns a new [Value] for a slice of key-value pairs. The passed +// slice must not be changed after it is passed. +func MapValue(kvs ...Attr) Value { + return Value{ + num: uint64(len(kvs)), + any: mapptr(unsafe.SliceData(kvs)), + } +} + +// AsString returns the value held by v as a string. +func (v Value) AsString() string { + if sp, ok := v.any.(stringptr); ok { + return unsafe.String(sp, v.num) + } + // TODO: error handle + return "" +} + +// asString returns the value held by v as a string. It will panic if the Value +// is not KindString. +func (v Value) asString() string { + return unsafe.String(v.any.(stringptr), v.num) +} + +// AsInt64 returns the value held by v as an int64. +func (v Value) AsInt64() int64 { + if v.Kind() != ValueKindInt64 { + // TODO: error handle + return 0 + } + return v.asInt64() +} + +// asInt64 returns the value held by v as an int64. If v is not of KindInt64, +// this will return garbage. +func (v Value) asInt64() int64 { + // Assumes v.num was a valid int64 (overflow not checked). + return int64(v.num) // nolint: gosec +} + +// AsBool returns the value held by v as a bool. +func (v Value) AsBool() bool { + if v.Kind() != ValueKindBool { + // TODO: error handle + return false + } + return v.asBool() +} + +// asBool returns the value held by v as a bool. If v is not of KindBool, this +// will return garbage. +func (v Value) asBool() bool { return v.num == 1 } + +// AsFloat64 returns the value held by v as a float64. +func (v Value) AsFloat64() float64 { + if v.Kind() != ValueKindFloat64 { + // TODO: error handle + return 0 + } + return v.asFloat64() +} + +// asFloat64 returns the value held by v as a float64. If v is not of +// KindFloat64, this will return garbage. +func (v Value) asFloat64() float64 { return math.Float64frombits(v.num) } + +// AsBytes returns the value held by v as a []byte. +func (v Value) AsBytes() []byte { + if sp, ok := v.any.(bytesptr); ok { + return unsafe.Slice((*byte)(sp), v.num) + } + // TODO: error handle + return nil +} + +// asBytes returns the value held by v as a []byte. It will panic if the Value +// is not KindBytes. +func (v Value) asBytes() []byte { + return unsafe.Slice((*byte)(v.any.(bytesptr)), v.num) +} + +// AsSlice returns the value held by v as a []Value. +func (v Value) AsSlice() []Value { + if sp, ok := v.any.(sliceptr); ok { + return unsafe.Slice((*Value)(sp), v.num) + } + // TODO: error handle + return nil +} + +// asSlice returns the value held by v as a []Value. It will panic if the Value +// is not KindSlice. +func (v Value) asSlice() []Value { + return unsafe.Slice((*Value)(v.any.(sliceptr)), v.num) +} + +// AsMap returns the value held by v as a []Attr. +func (v Value) AsMap() []Attr { + if sp, ok := v.any.(mapptr); ok { + return unsafe.Slice((*Attr)(sp), v.num) + } + // TODO: error handle + return nil +} + +// asMap returns the value held by v as a []Attr. It will panic if the +// Value is not KindMap. +func (v Value) asMap() []Attr { + return unsafe.Slice((*Attr)(v.any.(mapptr)), v.num) +} + +// Kind returns the Kind of v. +func (v Value) Kind() ValueKind { + switch x := v.any.(type) { + case ValueKind: + return x + case stringptr: + return ValueKindString + case bytesptr: + return ValueKindBytes + case sliceptr: + return ValueKindSlice + case mapptr: + return ValueKindMap + default: + return ValueKindEmpty + } +} + +// Empty returns if v does not hold any value. +func (v Value) Empty() bool { return v.Kind() == ValueKindEmpty } + +// Equal returns if v is equal to w. +func (v Value) Equal(w Value) bool { + k1 := v.Kind() + k2 := w.Kind() + if k1 != k2 { + return false + } + switch k1 { + case ValueKindInt64, ValueKindBool: + return v.num == w.num + case ValueKindString: + return v.asString() == w.asString() + case ValueKindFloat64: + return v.asFloat64() == w.asFloat64() + case ValueKindSlice: + return slices.EqualFunc(v.asSlice(), w.asSlice(), Value.Equal) + case ValueKindMap: + sv := sortMap(v.asMap()) + sw := sortMap(w.asMap()) + return slices.EqualFunc(sv, sw, Attr.Equal) + case ValueKindBytes: + return bytes.Equal(v.asBytes(), w.asBytes()) + case ValueKindEmpty: + return true + default: + // TODO: error handle + return false + } +} + +func sortMap(m []Attr) []Attr { + sm := make([]Attr, len(m)) + copy(sm, m) + slices.SortFunc(sm, func(a, b Attr) int { + return cmp.Compare(a.Key, b.Key) + }) + + return sm +} + +// String returns Value's value as a string, formatted like [fmt.Sprint]. +// +// The returned string is meant for debugging; +// the string representation is not stable. +func (v Value) String() string { + switch v.Kind() { + case ValueKindString: + return v.asString() + case ValueKindInt64: + // Assumes v.num was a valid int64 (overflow not checked). + return strconv.FormatInt(int64(v.num), 10) // nolint: gosec + case ValueKindFloat64: + return strconv.FormatFloat(v.asFloat64(), 'g', -1, 64) + case ValueKindBool: + return strconv.FormatBool(v.asBool()) + case ValueKindBytes: + return fmt.Sprint(v.asBytes()) + case ValueKindMap: + return fmt.Sprint(v.asMap()) + case ValueKindSlice: + return fmt.Sprint(v.asSlice()) + case ValueKindEmpty: + return "" + default: + // Try to handle this as gracefully as possible. + // + // Don't panic here. The goal here is to have developers find this + // first if a slog.Kind is is not handled. It is + // preferable to have user's open issue asking why their attributes + // have a "unhandled: " prefix than say that their code is panicking. + return fmt.Sprintf("", v.Kind()) + } +} + +// MarshalJSON encodes v into OTLP formatted JSON. +func (v *Value) MarshalJSON() ([]byte, error) { + switch v.Kind() { + case ValueKindString: + return json.Marshal(struct { + Value string `json:"stringValue"` + }{v.asString()}) + case ValueKindInt64: + return json.Marshal(struct { + Value string `json:"intValue"` + }{strconv.FormatInt(int64(v.num), 10)}) + case ValueKindFloat64: + return json.Marshal(struct { + Value float64 `json:"doubleValue"` + }{v.asFloat64()}) + case ValueKindBool: + return json.Marshal(struct { + Value bool `json:"boolValue"` + }{v.asBool()}) + case ValueKindBytes: + return json.Marshal(struct { + Value []byte `json:"bytesValue"` + }{v.asBytes()}) + case ValueKindMap: + return json.Marshal(struct { + Value struct { + Values []Attr `json:"values"` + } `json:"kvlistValue"` + }{struct { + Values []Attr `json:"values"` + }{v.asMap()}}) + case ValueKindSlice: + return json.Marshal(struct { + Value struct { + Values []Value `json:"values"` + } `json:"arrayValue"` + }{struct { + Values []Value `json:"values"` + }{v.asSlice()}}) + case ValueKindEmpty: + return nil, nil + default: + return nil, fmt.Errorf("unknown Value kind: %s", v.Kind().String()) + } +} + +// UnmarshalJSON decodes the OTLP formatted JSON contained in data into v. +func (v *Value) UnmarshalJSON(data []byte) error { + decoder := json.NewDecoder(bytes.NewReader(data)) + + t, err := decoder.Token() + if err != nil { + return err + } + if t != json.Delim('{') { + return errors.New("invalid Value type") + } + + for decoder.More() { + keyIface, err := decoder.Token() + if err != nil { + if errors.Is(err, io.EOF) { + // Empty. + return nil + } + return err + } + + key, ok := keyIface.(string) + if !ok { + return fmt.Errorf("invalid Value key: %#v", keyIface) + } + + switch key { + case "stringValue", "string_value": + var val string + err = decoder.Decode(&val) + *v = StringValue(val) + case "boolValue", "bool_value": + var val bool + err = decoder.Decode(&val) + *v = BoolValue(val) + case "intValue", "int_value": + var val protoInt64 + err = decoder.Decode(&val) + *v = Int64Value(val.Int64()) + case "doubleValue", "double_value": + var val float64 + err = decoder.Decode(&val) + *v = Float64Value(val) + case "bytesValue", "bytes_value": + var val64 string + if err := decoder.Decode(&val64); err != nil { + return err + } + var val []byte + val, err = base64.StdEncoding.DecodeString(val64) + *v = BytesValue(val) + case "arrayValue", "array_value": + var val struct{ Values []Value } + err = decoder.Decode(&val) + *v = SliceValue(val.Values...) + case "kvlistValue", "kvlist_value": + var val struct{ Values []Attr } + err = decoder.Decode(&val) + *v = MapValue(val.Values...) + default: + // Skip unknown. + continue + } + // Use first valid. Ignore the rest. + return err + } + + // Only unknown fields. Return nil without unmarshaling any value. + return nil +}