Support meta_struct in v0.4

packages/dd-trace/src/encode/0.4.js

@@ -83,13 +83,17 @@ class AgentEncoder {
       span = formatSpan(span)
       bytes.reserve(1)
 
-      if (span.type) {
+      if (span.type && span.meta_struct) {
+        bytes.buffer[bytes.length++] = 0x8d
+      } else if (span.type || span.meta_struct) {
         bytes.buffer[bytes.length++] = 0x8c
+      } else {
+        bytes.buffer[bytes.length++] = 0x8b
+      }
 
+      if (span.type) {
         this._encodeString(bytes, 'type')
         this._encodeString(bytes, span.type)
-      } else {
-        bytes.buffer[bytes.length++] = 0x8b
       }
 
       this._encodeString(bytes, 'trace_id')
@@ -114,6 +118,10 @@ class AgentEncoder {
       this._encodeMap(bytes, span.meta)
       this._encodeString(bytes, 'metrics')
       this._encodeMap(bytes, span.metrics)
+      if (span.meta_struct) {
+        this._encodeString(bytes, 'meta_struct')
+        this._encodeObject(bytes, span.meta_struct)
+      }
     }
   }
 
@@ -263,6 +271,45 @@ class AgentEncoder {
     }
   }
 
+  _encodeObject (bytes, value, circularReferencesDetector = new Set()) {
+    circularReferencesDetector.add(value)
+    if (Array.isArray(value)) {
+      return this._encodeObjectAsArray(bytes, value, circularReferencesDetector)
+    } else if (value !== null && typeof value === 'object') {
+      return this._encodeObjectAsMap(bytes, value, circularReferencesDetector)
+    } else if (typeof value === 'string' || typeof value === 'number') {
+      this._encodeValue(bytes, value)
+    }
+  }
+
+  _encodeObjectAsMap (bytes, value, circularReferencesDetector) {
+    const keys = Object.keys(value)
+    const validKeys = keys.filter(key =>
+      typeof value[key] === 'string' ||
+      typeof value[key] === 'number' ||
+      (value[key] !== null && typeof value[key] === 'object' && !circularReferencesDetector.has(value[key])))
+
+    this._encodeMapPrefix(bytes, validKeys.length)
+
+    for (const key of validKeys) {
+      this._encodeString(bytes, key)
+      this._encodeObject(bytes, value[key], circularReferencesDetector)
+    }
+  }
+
+  _encodeObjectAsArray (bytes, value, circularReferencesDetector) {
+    const validValue = value.filter(item =>
+      typeof item === 'string' ||
+      typeof item === 'number' ||
+      (item !== null && typeof item === 'object' && !circularReferencesDetector.has(item)))
+
+    this._encodeArrayPrefix(bytes, validValue)
+
+    for (const item of validValue) {
+      this._encodeObject(bytes, item, circularReferencesDetector)
+    }
+  }
+
   _cacheString (value) {
     if (!(value in this._stringMap)) {
       this._stringCount++

packages/dd-trace/test/encode/0.4.spec.js

@@ -235,4 +235,223 @@ describe('encode', () => {
     expect(trace[0].meta).to.deep.equal({ bar: 'baz', '_dd.span_links': encodedLink })
     expect(trace[0].metrics).to.deep.equal({ example: 1 })
   })
+
+  describe('meta_struct', () => {
+    it('should encode meta_struct with simple key value object', () => {
+      const metaStruct = {
+        foo: 'bar',
+        baz: 123
+      }
+      data[0].meta_struct = metaStruct
+      encoder.encode(data)
+
+      const buffer = encoder.makePayload()
+
+      const decoded = msgpack.decode(buffer, { codec })
+      const trace = decoded[0]
+      expect(trace[0].meta_struct).to.deep.equal(metaStruct)
+    })
+
+    it('should encode meta_struct with simple array of simple values', () => {
+      const metaStruct = ['one', 2, 'three', 4, 5, 'six']
+      data[0].meta_struct = metaStruct
+      encoder.encode(data)
+
+      const buffer = encoder.makePayload()
+
+      const decoded = msgpack.decode(buffer, { codec })
+      const trace = decoded[0]
+      expect(trace[0].meta_struct).to.deep.equal(metaStruct)
+    })
+
+    it('should encode meta_struct with array of objects', () => {
+      const metaStruct = [{ foo: 'bar' }, { baz: 123 }]
+      data[0].meta_struct = metaStruct
+      encoder.encode(data)
+
+      const buffer = encoder.makePayload()
+
+      const decoded = msgpack.decode(buffer, { codec })
+      const trace = decoded[0]
+      expect(trace[0].meta_struct).to.deep.equal(metaStruct)
+    })
+
+    it('should encode meta_struct with empty object and array', () => {
+      const metaStruct = {
+        foo: {},
+        bar: []
+      }
+      data[0].meta_struct = metaStruct
+      encoder.encode(data)
+
+      const buffer = encoder.makePayload()
+
+      const decoded = msgpack.decode(buffer, { codec })
+      const trace = decoded[0]
+      expect(trace[0].meta_struct).to.deep.equal(metaStruct)
+    })
+
+    it('should encode meta_struct with possible real use case', () => {
+      const metaStruct = {
+        '_dd.stack': {
+          exploit: [
+            {
+              type: 'test',
+              language: 'nodejs',
+              id: 'someuuid',
+              message: 'Threat detected',
+              frames: [
+                {
+                  id: 0,
+                  file: 'test.js',
+                  line: 1,
+                  column: 31,
+                  function: 'test'
+                },
+                {
+                  id: 1,
+                  file: 'test2.js',
+                  line: 54,
+                  column: 77,
+                  function: 'test'
+                },
+                {
+                  id: 2,
+                  file: 'test.js',
+                  line: 1245,
+                  column: 41,
+                  function: 'test'
+                },
+                {
+                  id: 3,
+                  file: 'test3.js',
+                  line: 2024,
+                  column: 32,
+                  function: 'test'
+                }
+              ]
+            }
+          ]
+        }
+      }
+      data[0].meta_struct = metaStruct
+
+      encoder.encode(data)
+
+      const buffer = encoder.makePayload()
+
+      const decoded = msgpack.decode(buffer, { codec })
+      const trace = decoded[0]
+      expect(trace[0].meta_struct).to.deep.equal(metaStruct)
+    })
+
+    it('should encode meta_struct ignoring circular references in objects', () => {
+      const circular = {
+        bar: 'baz',
+        deeper: {
+          foo: 'bar'
+        }
+      }
+      circular.deeper.circular = circular
+      const metaStruct = {
+        foo: circular
+      }
+      data[0].meta_struct = metaStruct
+
+      encoder.encode(data)
+
+      const buffer = encoder.makePayload()
+
+      const decoded = msgpack.decode(buffer, { codec })
+      const trace = decoded[0]
+
+      const expectedMetaStruct = {
+        foo: {
+          bar: 'baz',
+          deeper: {
+            foo: 'bar'
+          }
+        }
+      }
+      expect(trace[0].meta_struct).to.deep.equal(expectedMetaStruct)
+    })
+
+    it('should encode meta_struct ignoring circular references in arrays', () => {
+      const circular = [{
+        bar: 'baz'
+      }]
+      circular.push(circular)
+      const metaStruct = {
+        foo: circular
+      }
+      data[0].meta_struct = metaStruct
+
+      encoder.encode(data)
+
+      const buffer = encoder.makePayload()
+
+      const decoded = msgpack.decode(buffer, { codec })
+      const trace = decoded[0]
+
+      const expectedMetaStruct = {
+        foo: [{
+          bar: 'baz'
+        }]
+      }
+      expect(trace[0].meta_struct).to.deep.equal(expectedMetaStruct)
+    })
+
+    it('should encode meta_struct ignoring undefined properties', () => {
+      const metaStruct = {
+        foo: 'bar',
+        undefinedProperty: undefined
+      }
+      data[0].meta_struct = metaStruct
+
+      encoder.encode(data)
+
+      const buffer = encoder.makePayload()
+
+      const decoded = msgpack.decode(buffer, { codec })
+      const trace = decoded[0]
+
+      const expectedMetaStruct = {
+        foo: 'bar'
+      }
+      expect(trace[0].meta_struct).to.deep.equal(expectedMetaStruct)
+    })
+
+    it('should encode meta_struct ignoring null properties', () => {
+      const metaStruct = {
+        foo: 'bar',
+        nullProperty: null
+      }
+      data[0].meta_struct = metaStruct
+
+      encoder.encode(data)
+
+      const buffer = encoder.makePayload()
+
+      const decoded = msgpack.decode(buffer, { codec })
+      const trace = decoded[0]
+
+      const expectedMetaStruct = {
+        foo: 'bar'
+      }
+      expect(trace[0].meta_struct).to.deep.equal(expectedMetaStruct)
+    })
+
+    it('should not encode null meta_struct', () => {
+      data[0].meta_struct = null
+
+      encoder.encode(data)
+
+      const buffer = encoder.makePayload()
+
+      const decoded = msgpack.decode(buffer, { codec })
+      const trace = decoded[0]
+
+      expect(trace[0].meta_struct).to.be.undefined
+    })
+  })
 })

packages/dd-trace/test/encode/0.5.spec.js

@@ -189,4 +189,31 @@ describe('encode 0.5', () => {
     expect(payload[5]).to.equal(1)
     expect(payload[11]).to.equal(0)
   })
+
+  it('should ignore meta_struct property', () => {
+    data[0].meta_struct = { foo: 'bar' }
+
+    encoder.encode(data)
+
+    const buffer = encoder.makePayload()
+    const decoded = msgpack.decode(buffer, { codec })
+    const stringMap = decoded[0]
+    const trace = decoded[1][0]
+
+    expect(trace).to.be.instanceof(Array)
+    expect(trace[0]).to.be.instanceof(Array)
+    expect(stringMap[trace[0][0]]).to.equal(data[0].service)
+    expect(stringMap[trace[0][1]]).to.equal(data[0].name)
+    expect(stringMap[trace[0][2]]).to.equal(data[0].resource)
+    expect(trace[0][3].toString(16)).to.equal(data[0].trace_id.toString())
+    expect(trace[0][4].toString(16)).to.equal(data[0].span_id.toString())
+    expect(trace[0][5].toString(16)).to.equal(data[0].parent_id.toString())
+    expect(trace[0][6].toNumber()).to.equal(data[0].start)
+    expect(trace[0][7].toNumber()).to.equal(data[0].duration)
+    expect(trace[0][8]).to.equal(0)
+    expect(trace[0][9]).to.deep.equal({ [stringMap.indexOf('bar')]: stringMap.indexOf('baz') })
+    expect(trace[0][10]).to.deep.equal({ [stringMap.indexOf('example')]: 1 })
+    expect(stringMap[trace[0][11]]).to.equal('') // unset
+    expect(trace[0][12]).to.be.undefined // Everything works the same as without meta_struct, and nothing else is added
+  })
 })