1package json 2 3import ( 4 "encoding/json" 5 "fmt" 6 "math" 7 "net" 8 "strconv" 9) 10 11// AppendNil inserts a 'Nil' object into the dst byte array. 12func (Encoder) AppendNil(dst []byte) []byte { 13 return append(dst, "null"...) 14} 15 16// AppendBeginMarker inserts a map start into the dst byte array. 17func (Encoder) AppendBeginMarker(dst []byte) []byte { 18 return append(dst, '{') 19} 20 21// AppendEndMarker inserts a map end into the dst byte array. 22func (Encoder) AppendEndMarker(dst []byte) []byte { 23 return append(dst, '}') 24} 25 26// AppendLineBreak appends a line break. 27func (Encoder) AppendLineBreak(dst []byte) []byte { 28 return append(dst, '\n') 29} 30 31// AppendArrayStart adds markers to indicate the start of an array. 32func (Encoder) AppendArrayStart(dst []byte) []byte { 33 return append(dst, '[') 34} 35 36// AppendArrayEnd adds markers to indicate the end of an array. 37func (Encoder) AppendArrayEnd(dst []byte) []byte { 38 return append(dst, ']') 39} 40 41// AppendArrayDelim adds markers to indicate end of a particular array element. 42func (Encoder) AppendArrayDelim(dst []byte) []byte { 43 if len(dst) > 0 { 44 return append(dst, ',') 45 } 46 return dst 47} 48 49// AppendBool converts the input bool to a string and 50// appends the encoded string to the input byte slice. 51func (Encoder) AppendBool(dst []byte, val bool) []byte { 52 return strconv.AppendBool(dst, val) 53} 54 55// AppendBools encodes the input bools to json and 56// appends the encoded string list to the input byte slice. 57func (Encoder) AppendBools(dst []byte, vals []bool) []byte { 58 if len(vals) == 0 { 59 return append(dst, '[', ']') 60 } 61 dst = append(dst, '[') 62 dst = strconv.AppendBool(dst, vals[0]) 63 if len(vals) > 1 { 64 for _, val := range vals[1:] { 65 dst = strconv.AppendBool(append(dst, ','), val) 66 } 67 } 68 dst = append(dst, ']') 69 return dst 70} 71 72// AppendInt converts the input int to a string and 73// appends the encoded string to the input byte slice. 74func (Encoder) AppendInt(dst []byte, val int) []byte { 75 return strconv.AppendInt(dst, int64(val), 10) 76} 77 78// AppendInts encodes the input ints to json and 79// appends the encoded string list to the input byte slice. 80func (Encoder) AppendInts(dst []byte, vals []int) []byte { 81 if len(vals) == 0 { 82 return append(dst, '[', ']') 83 } 84 dst = append(dst, '[') 85 dst = strconv.AppendInt(dst, int64(vals[0]), 10) 86 if len(vals) > 1 { 87 for _, val := range vals[1:] { 88 dst = strconv.AppendInt(append(dst, ','), int64(val), 10) 89 } 90 } 91 dst = append(dst, ']') 92 return dst 93} 94 95// AppendInt8 converts the input []int8 to a string and 96// appends the encoded string to the input byte slice. 97func (Encoder) AppendInt8(dst []byte, val int8) []byte { 98 return strconv.AppendInt(dst, int64(val), 10) 99} 100 101// AppendInts8 encodes the input int8s to json and 102// appends the encoded string list to the input byte slice. 103func (Encoder) AppendInts8(dst []byte, vals []int8) []byte { 104 if len(vals) == 0 { 105 return append(dst, '[', ']') 106 } 107 dst = append(dst, '[') 108 dst = strconv.AppendInt(dst, int64(vals[0]), 10) 109 if len(vals) > 1 { 110 for _, val := range vals[1:] { 111 dst = strconv.AppendInt(append(dst, ','), int64(val), 10) 112 } 113 } 114 dst = append(dst, ']') 115 return dst 116} 117 118// AppendInt16 converts the input int16 to a string and 119// appends the encoded string to the input byte slice. 120func (Encoder) AppendInt16(dst []byte, val int16) []byte { 121 return strconv.AppendInt(dst, int64(val), 10) 122} 123 124// AppendInts16 encodes the input int16s to json and 125// appends the encoded string list to the input byte slice. 126func (Encoder) AppendInts16(dst []byte, vals []int16) []byte { 127 if len(vals) == 0 { 128 return append(dst, '[', ']') 129 } 130 dst = append(dst, '[') 131 dst = strconv.AppendInt(dst, int64(vals[0]), 10) 132 if len(vals) > 1 { 133 for _, val := range vals[1:] { 134 dst = strconv.AppendInt(append(dst, ','), int64(val), 10) 135 } 136 } 137 dst = append(dst, ']') 138 return dst 139} 140 141// AppendInt32 converts the input int32 to a string and 142// appends the encoded string to the input byte slice. 143func (Encoder) AppendInt32(dst []byte, val int32) []byte { 144 return strconv.AppendInt(dst, int64(val), 10) 145} 146 147// AppendInts32 encodes the input int32s to json and 148// appends the encoded string list to the input byte slice. 149func (Encoder) AppendInts32(dst []byte, vals []int32) []byte { 150 if len(vals) == 0 { 151 return append(dst, '[', ']') 152 } 153 dst = append(dst, '[') 154 dst = strconv.AppendInt(dst, int64(vals[0]), 10) 155 if len(vals) > 1 { 156 for _, val := range vals[1:] { 157 dst = strconv.AppendInt(append(dst, ','), int64(val), 10) 158 } 159 } 160 dst = append(dst, ']') 161 return dst 162} 163 164// AppendInt64 converts the input int64 to a string and 165// appends the encoded string to the input byte slice. 166func (Encoder) AppendInt64(dst []byte, val int64) []byte { 167 return strconv.AppendInt(dst, val, 10) 168} 169 170// AppendInts64 encodes the input int64s to json and 171// appends the encoded string list to the input byte slice. 172func (Encoder) AppendInts64(dst []byte, vals []int64) []byte { 173 if len(vals) == 0 { 174 return append(dst, '[', ']') 175 } 176 dst = append(dst, '[') 177 dst = strconv.AppendInt(dst, vals[0], 10) 178 if len(vals) > 1 { 179 for _, val := range vals[1:] { 180 dst = strconv.AppendInt(append(dst, ','), val, 10) 181 } 182 } 183 dst = append(dst, ']') 184 return dst 185} 186 187// AppendUint converts the input uint to a string and 188// appends the encoded string to the input byte slice. 189func (Encoder) AppendUint(dst []byte, val uint) []byte { 190 return strconv.AppendUint(dst, uint64(val), 10) 191} 192 193// AppendUints encodes the input uints to json and 194// appends the encoded string list to the input byte slice. 195func (Encoder) AppendUints(dst []byte, vals []uint) []byte { 196 if len(vals) == 0 { 197 return append(dst, '[', ']') 198 } 199 dst = append(dst, '[') 200 dst = strconv.AppendUint(dst, uint64(vals[0]), 10) 201 if len(vals) > 1 { 202 for _, val := range vals[1:] { 203 dst = strconv.AppendUint(append(dst, ','), uint64(val), 10) 204 } 205 } 206 dst = append(dst, ']') 207 return dst 208} 209 210// AppendUint8 converts the input uint8 to a string and 211// appends the encoded string to the input byte slice. 212func (Encoder) AppendUint8(dst []byte, val uint8) []byte { 213 return strconv.AppendUint(dst, uint64(val), 10) 214} 215 216// AppendUints8 encodes the input uint8s to json and 217// appends the encoded string list to the input byte slice. 218func (Encoder) AppendUints8(dst []byte, vals []uint8) []byte { 219 if len(vals) == 0 { 220 return append(dst, '[', ']') 221 } 222 dst = append(dst, '[') 223 dst = strconv.AppendUint(dst, uint64(vals[0]), 10) 224 if len(vals) > 1 { 225 for _, val := range vals[1:] { 226 dst = strconv.AppendUint(append(dst, ','), uint64(val), 10) 227 } 228 } 229 dst = append(dst, ']') 230 return dst 231} 232 233// AppendUint16 converts the input uint16 to a string and 234// appends the encoded string to the input byte slice. 235func (Encoder) AppendUint16(dst []byte, val uint16) []byte { 236 return strconv.AppendUint(dst, uint64(val), 10) 237} 238 239// AppendUints16 encodes the input uint16s to json and 240// appends the encoded string list to the input byte slice. 241func (Encoder) AppendUints16(dst []byte, vals []uint16) []byte { 242 if len(vals) == 0 { 243 return append(dst, '[', ']') 244 } 245 dst = append(dst, '[') 246 dst = strconv.AppendUint(dst, uint64(vals[0]), 10) 247 if len(vals) > 1 { 248 for _, val := range vals[1:] { 249 dst = strconv.AppendUint(append(dst, ','), uint64(val), 10) 250 } 251 } 252 dst = append(dst, ']') 253 return dst 254} 255 256// AppendUint32 converts the input uint32 to a string and 257// appends the encoded string to the input byte slice. 258func (Encoder) AppendUint32(dst []byte, val uint32) []byte { 259 return strconv.AppendUint(dst, uint64(val), 10) 260} 261 262// AppendUints32 encodes the input uint32s to json and 263// appends the encoded string list to the input byte slice. 264func (Encoder) AppendUints32(dst []byte, vals []uint32) []byte { 265 if len(vals) == 0 { 266 return append(dst, '[', ']') 267 } 268 dst = append(dst, '[') 269 dst = strconv.AppendUint(dst, uint64(vals[0]), 10) 270 if len(vals) > 1 { 271 for _, val := range vals[1:] { 272 dst = strconv.AppendUint(append(dst, ','), uint64(val), 10) 273 } 274 } 275 dst = append(dst, ']') 276 return dst 277} 278 279// AppendUint64 converts the input uint64 to a string and 280// appends the encoded string to the input byte slice. 281func (Encoder) AppendUint64(dst []byte, val uint64) []byte { 282 return strconv.AppendUint(dst, uint64(val), 10) 283} 284 285// AppendUints64 encodes the input uint64s to json and 286// appends the encoded string list to the input byte slice. 287func (Encoder) AppendUints64(dst []byte, vals []uint64) []byte { 288 if len(vals) == 0 { 289 return append(dst, '[', ']') 290 } 291 dst = append(dst, '[') 292 dst = strconv.AppendUint(dst, vals[0], 10) 293 if len(vals) > 1 { 294 for _, val := range vals[1:] { 295 dst = strconv.AppendUint(append(dst, ','), val, 10) 296 } 297 } 298 dst = append(dst, ']') 299 return dst 300} 301 302func appendFloat(dst []byte, val float64, bitSize int) []byte { 303 // JSON does not permit NaN or Infinity. A typical JSON encoder would fail 304 // with an error, but a logging library wants the data to get thru so we 305 // make a tradeoff and store those types as string. 306 switch { 307 case math.IsNaN(val): 308 return append(dst, `"NaN"`...) 309 case math.IsInf(val, 1): 310 return append(dst, `"+Inf"`...) 311 case math.IsInf(val, -1): 312 return append(dst, `"-Inf"`...) 313 } 314 return strconv.AppendFloat(dst, val, 'f', -1, bitSize) 315} 316 317// AppendFloat32 converts the input float32 to a string and 318// appends the encoded string to the input byte slice. 319func (Encoder) AppendFloat32(dst []byte, val float32) []byte { 320 return appendFloat(dst, float64(val), 32) 321} 322 323// AppendFloats32 encodes the input float32s to json and 324// appends the encoded string list to the input byte slice. 325func (Encoder) AppendFloats32(dst []byte, vals []float32) []byte { 326 if len(vals) == 0 { 327 return append(dst, '[', ']') 328 } 329 dst = append(dst, '[') 330 dst = appendFloat(dst, float64(vals[0]), 32) 331 if len(vals) > 1 { 332 for _, val := range vals[1:] { 333 dst = appendFloat(append(dst, ','), float64(val), 32) 334 } 335 } 336 dst = append(dst, ']') 337 return dst 338} 339 340// AppendFloat64 converts the input float64 to a string and 341// appends the encoded string to the input byte slice. 342func (Encoder) AppendFloat64(dst []byte, val float64) []byte { 343 return appendFloat(dst, val, 64) 344} 345 346// AppendFloats64 encodes the input float64s to json and 347// appends the encoded string list to the input byte slice. 348func (Encoder) AppendFloats64(dst []byte, vals []float64) []byte { 349 if len(vals) == 0 { 350 return append(dst, '[', ']') 351 } 352 dst = append(dst, '[') 353 dst = appendFloat(dst, vals[0], 32) 354 if len(vals) > 1 { 355 for _, val := range vals[1:] { 356 dst = appendFloat(append(dst, ','), val, 64) 357 } 358 } 359 dst = append(dst, ']') 360 return dst 361} 362 363// AppendInterface marshals the input interface to a string and 364// appends the encoded string to the input byte slice. 365func (e Encoder) AppendInterface(dst []byte, i interface{}) []byte { 366 marshaled, err := json.Marshal(i) 367 if err != nil { 368 return e.AppendString(dst, fmt.Sprintf("marshaling error: %v", err)) 369 } 370 return append(dst, marshaled...) 371} 372 373// AppendObjectData takes in an object that is already in a byte array 374// and adds it to the dst. 375func (Encoder) AppendObjectData(dst []byte, o []byte) []byte { 376 // Three conditions apply here: 377 // 1. new content starts with '{' - which should be dropped OR 378 // 2. new content starts with '{' - which should be replaced with ',' 379 // to separate with existing content OR 380 // 3. existing content has already other fields 381 if o[0] == '{' { 382 if len(dst) == 0 { 383 o = o[1:] 384 } else { 385 o[0] = ',' 386 } 387 } else if len(dst) > 1 { 388 dst = append(dst, ',') 389 } 390 return append(dst, o...) 391} 392 393// AppendIPAddr adds IPv4 or IPv6 address to dst. 394func (e Encoder) AppendIPAddr(dst []byte, ip net.IP) []byte { 395 return e.AppendString(dst, ip.String()) 396} 397 398// AppendIPPrefix adds IPv4 or IPv6 Prefix (address & mask) to dst. 399func (e Encoder) AppendIPPrefix(dst []byte, pfx net.IPNet) []byte { 400 return e.AppendString(dst, pfx.String()) 401 402} 403 404// AppendMACAddr adds MAC address to dst. 405func (e Encoder) AppendMACAddr(dst []byte, ha net.HardwareAddr) []byte { 406 return e.AppendString(dst, ha.String()) 407} 408