convert.go

Documentation: github.com/grpc-ecosystem/grpc-gateway/runtime

     1  package runtime
     2  
     3  import (
     4  	"encoding/base64"
     5  	"fmt"
     6  	"strconv"
     7  	"strings"
     8  
     9  	"github.com/golang/protobuf/jsonpb"
    10  	"github.com/golang/protobuf/ptypes/duration"
    11  	"github.com/golang/protobuf/ptypes/timestamp"
    12  	"github.com/golang/protobuf/ptypes/wrappers"
    13  )
    14  
    15  // String just returns the given string.
    16  // It is just for compatibility to other types.
    17  func String(val string) (string, error) {
    18  	return val, nil
    19  }
    20  
    21  // StringSlice converts 'val' where individual strings are separated by
    22  // 'sep' into a string slice.
    23  func StringSlice(val, sep string) ([]string, error) {
    24  	return strings.Split(val, sep), nil
    25  }
    26  
    27  // Bool converts the given string representation of a boolean value into bool.
    28  func Bool(val string) (bool, error) {
    29  	return strconv.ParseBool(val)
    30  }
    31  
    32  // BoolSlice converts 'val' where individual booleans are separated by
    33  // 'sep' into a bool slice.
    34  func BoolSlice(val, sep string) ([]bool, error) {
    35  	s := strings.Split(val, sep)
    36  	values := make([]bool, len(s))
    37  	for i, v := range s {
    38  		value, err := Bool(v)
    39  		if err != nil {
    40  			return values, err
    41  		}
    42  		values[i] = value
    43  	}
    44  	return values, nil
    45  }
    46  
    47  // Float64 converts the given string representation into representation of a floating point number into float64.
    48  func Float64(val string) (float64, error) {
    49  	return strconv.ParseFloat(val, 64)
    50  }
    51  
    52  // Float64Slice converts 'val' where individual floating point numbers are separated by
    53  // 'sep' into a float64 slice.
    54  func Float64Slice(val, sep string) ([]float64, error) {
    55  	s := strings.Split(val, sep)
    56  	values := make([]float64, len(s))
    57  	for i, v := range s {
    58  		value, err := Float64(v)
    59  		if err != nil {
    60  			return values, err
    61  		}
    62  		values[i] = value
    63  	}
    64  	return values, nil
    65  }
    66  
    67  // Float32 converts the given string representation of a floating point number into float32.
    68  func Float32(val string) (float32, error) {
    69  	f, err := strconv.ParseFloat(val, 32)
    70  	if err != nil {
    71  		return 0, err
    72  	}
    73  	return float32(f), nil
    74  }
    75  
    76  // Float32Slice converts 'val' where individual floating point numbers are separated by
    77  // 'sep' into a float32 slice.
    78  func Float32Slice(val, sep string) ([]float32, error) {
    79  	s := strings.Split(val, sep)
    80  	values := make([]float32, len(s))
    81  	for i, v := range s {
    82  		value, err := Float32(v)
    83  		if err != nil {
    84  			return values, err
    85  		}
    86  		values[i] = value
    87  	}
    88  	return values, nil
    89  }
    90  
    91  // Int64 converts the given string representation of an integer into int64.
    92  func Int64(val string) (int64, error) {
    93  	return strconv.ParseInt(val, 0, 64)
    94  }
    95  
    96  // Int64Slice converts 'val' where individual integers are separated by
    97  // 'sep' into a int64 slice.
    98  func Int64Slice(val, sep string) ([]int64, error) {
    99  	s := strings.Split(val, sep)
   100  	values := make([]int64, len(s))
   101  	for i, v := range s {
   102  		value, err := Int64(v)
   103  		if err != nil {
   104  			return values, err
   105  		}
   106  		values[i] = value
   107  	}
   108  	return values, nil
   109  }
   110  
   111  // Int32 converts the given string representation of an integer into int32.
   112  func Int32(val string) (int32, error) {
   113  	i, err := strconv.ParseInt(val, 0, 32)
   114  	if err != nil {
   115  		return 0, err
   116  	}
   117  	return int32(i), nil
   118  }
   119  
   120  // Int32Slice converts 'val' where individual integers are separated by
   121  // 'sep' into a int32 slice.
   122  func Int32Slice(val, sep string) ([]int32, error) {
   123  	s := strings.Split(val, sep)
   124  	values := make([]int32, len(s))
   125  	for i, v := range s {
   126  		value, err := Int32(v)
   127  		if err != nil {
   128  			return values, err
   129  		}
   130  		values[i] = value
   131  	}
   132  	return values, nil
   133  }
   134  
   135  // Uint64 converts the given string representation of an integer into uint64.
   136  func Uint64(val string) (uint64, error) {
   137  	return strconv.ParseUint(val, 0, 64)
   138  }
   139  
   140  // Uint64Slice converts 'val' where individual integers are separated by
   141  // 'sep' into a uint64 slice.
   142  func Uint64Slice(val, sep string) ([]uint64, error) {
   143  	s := strings.Split(val, sep)
   144  	values := make([]uint64, len(s))
   145  	for i, v := range s {
   146  		value, err := Uint64(v)
   147  		if err != nil {
   148  			return values, err
   149  		}
   150  		values[i] = value
   151  	}
   152  	return values, nil
   153  }
   154  
   155  // Uint32 converts the given string representation of an integer into uint32.
   156  func Uint32(val string) (uint32, error) {
   157  	i, err := strconv.ParseUint(val, 0, 32)
   158  	if err != nil {
   159  		return 0, err
   160  	}
   161  	return uint32(i), nil
   162  }
   163  
   164  // Uint32Slice converts 'val' where individual integers are separated by
   165  // 'sep' into a uint32 slice.
   166  func Uint32Slice(val, sep string) ([]uint32, error) {
   167  	s := strings.Split(val, sep)
   168  	values := make([]uint32, len(s))
   169  	for i, v := range s {
   170  		value, err := Uint32(v)
   171  		if err != nil {
   172  			return values, err
   173  		}
   174  		values[i] = value
   175  	}
   176  	return values, nil
   177  }
   178  
   179  // Bytes converts the given string representation of a byte sequence into a slice of bytes
   180  // A bytes sequence is encoded in URL-safe base64 without padding
   181  func Bytes(val string) ([]byte, error) {
   182  	b, err := base64.StdEncoding.DecodeString(val)
   183  	if err != nil {
   184  		b, err = base64.URLEncoding.DecodeString(val)
   185  		if err != nil {
   186  			return nil, err
   187  		}
   188  	}
   189  	return b, nil
   190  }
   191  
   192  // BytesSlice converts 'val' where individual bytes sequences, encoded in URL-safe
   193  // base64 without padding, are separated by 'sep' into a slice of bytes slices slice.
   194  func BytesSlice(val, sep string) ([][]byte, error) {
   195  	s := strings.Split(val, sep)
   196  	values := make([][]byte, len(s))
   197  	for i, v := range s {
   198  		value, err := Bytes(v)
   199  		if err != nil {
   200  			return values, err
   201  		}
   202  		values[i] = value
   203  	}
   204  	return values, nil
   205  }
   206  
   207  // Timestamp converts the given RFC3339 formatted string into a timestamp.Timestamp.
   208  func Timestamp(val string) (*timestamp.Timestamp, error) {
   209  	var r timestamp.Timestamp
   210  	err := jsonpb.UnmarshalString(val, &r)
   211  	if err != nil {
   212  		return nil, err
   213  	}
   214  	return &r, nil
   215  }
   216  
   217  // Duration converts the given string into a timestamp.Duration.
   218  func Duration(val string) (*duration.Duration, error) {
   219  	var r duration.Duration
   220  	err := jsonpb.UnmarshalString(val, &r)
   221  	if err != nil {
   222  		return nil, err
   223  	}
   224  	return &r, nil
   225  }
   226  
   227  // Enum converts the given string into an int32 that should be type casted into the
   228  // correct enum proto type.
   229  func Enum(val string, enumValMap map[string]int32) (int32, error) {
   230  	e, ok := enumValMap[val]
   231  	if ok {
   232  		return e, nil
   233  	}
   234  
   235  	i, err := Int32(val)
   236  	if err != nil {
   237  		return 0, fmt.Errorf("%s is not valid", val)
   238  	}
   239  	for _, v := range enumValMap {
   240  		if v == i {
   241  			return i, nil
   242  		}
   243  	}
   244  	return 0, fmt.Errorf("%s is not valid", val)
   245  }
   246  
   247  // EnumSlice converts 'val' where individual enums are separated by 'sep'
   248  // into a int32 slice. Each individual int32 should be type casted into the
   249  // correct enum proto type.
   250  func EnumSlice(val, sep string, enumValMap map[string]int32) ([]int32, error) {
   251  	s := strings.Split(val, sep)
   252  	values := make([]int32, len(s))
   253  	for i, v := range s {
   254  		value, err := Enum(v, enumValMap)
   255  		if err != nil {
   256  			return values, err
   257  		}
   258  		values[i] = value
   259  	}
   260  	return values, nil
   261  }
   262  
   263  /*
   264  	Support fot google.protobuf.wrappers on top of primitive types
   265  */
   266  
   267  // StringValue well-known type support as wrapper around string type
   268  func StringValue(val string) (*wrappers.StringValue, error) {
   269  	return &wrappers.StringValue{Value: val}, nil
   270  }
   271  
   272  // FloatValue well-known type support as wrapper around float32 type
   273  func FloatValue(val string) (*wrappers.FloatValue, error) {
   274  	parsedVal, err := Float32(val)
   275  	return &wrappers.FloatValue{Value: parsedVal}, err
   276  }
   277  
   278  // DoubleValue well-known type support as wrapper around float64 type
   279  func DoubleValue(val string) (*wrappers.DoubleValue, error) {
   280  	parsedVal, err := Float64(val)
   281  	return &wrappers.DoubleValue{Value: parsedVal}, err
   282  }
   283  
   284  // BoolValue well-known type support as wrapper around bool type
   285  func BoolValue(val string) (*wrappers.BoolValue, error) {
   286  	parsedVal, err := Bool(val)
   287  	return &wrappers.BoolValue{Value: parsedVal}, err
   288  }
   289  
   290  // Int32Value well-known type support as wrapper around int32 type
   291  func Int32Value(val string) (*wrappers.Int32Value, error) {
   292  	parsedVal, err := Int32(val)
   293  	return &wrappers.Int32Value{Value: parsedVal}, err
   294  }
   295  
   296  // UInt32Value well-known type support as wrapper around uint32 type
   297  func UInt32Value(val string) (*wrappers.UInt32Value, error) {
   298  	parsedVal, err := Uint32(val)
   299  	return &wrappers.UInt32Value{Value: parsedVal}, err
   300  }
   301  
   302  // Int64Value well-known type support as wrapper around int64 type
   303  func Int64Value(val string) (*wrappers.Int64Value, error) {
   304  	parsedVal, err := Int64(val)
   305  	return &wrappers.Int64Value{Value: parsedVal}, err
   306  }
   307  
   308  // UInt64Value well-known type support as wrapper around uint64 type
   309  func UInt64Value(val string) (*wrappers.UInt64Value, error) {
   310  	parsedVal, err := Uint64(val)
   311  	return &wrappers.UInt64Value{Value: parsedVal}, err
   312  }
   313  
   314  // BytesValue well-known type support as wrapper around bytes[] type
   315  func BytesValue(val string) (*wrappers.BytesValue, error) {
   316  	parsedVal, err := Bytes(val)
   317  	return &wrappers.BytesValue{Value: parsedVal}, err
   318  }
   319
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