v0.0.141

README.md

@@ -5,4 +5,36 @@ A collection of general & useful library methods
 
 This should not have any heavy dependencies (gin, mongo, etc) and add missing basic language features...
 
-Potentially needs `export GOPRIVATE="gogs.mikescher.com"`
+Potentially needs `export GOPRIVATE="gogs.mikescher.com"`
+
+
+### Packages:
+
+| Name        | Maintainer | Description                                                                                                   |
+|-------------|------------|---------------------------------------------------------------------------------------------------------------|
+| langext     | Mike       | General uttility/helper functions, (everything thats missing from go standard library)                        |
+| mathext     | Mike       | Utility/Helper functions for math                                                                             |
+| cryptext    | Mike       | Utility/Helper functions for encryption                                                                       |
+| syncext     | Mike       | Utility/Helper funtions for multi-threading / mutex / channels                                                |
+| dataext     | Mike       | Various useful data structures                                                                                |
+| zipext      | Mike       | Utility for zip/gzip/tar etc                                                                                  |
+|             |            |                                                                                                               |
+| mongoext    | Mike       | Utility/Helper functions for mongodb                                                                          |
+| cursortoken | Mike       | MongoDB cursortoken implementation                                                                            |
+|             |            |                                                                                                               |
+| totpext     | Mike       | Implementation of TOTP (2-Factor-Auth)                                                                        |
+| termext     | Mike       | Utilities for terminals (mostly color output)                                                                 |
+| confext     | Mike       | Parses environment configuration into structs                                                                 |
+| cmdext      | Mike       | Runner for external commands/processes                                                                        |
+|             |            |                                                                                                               |
+| sq          | Mike       | Utility functions for sql based databases                                                                     |
+| tst         | Mike       | Utility functions for unit tests                                                                              |
+|             |            |                                                                                                               |
+| rfctime     | Mike       | Classes for time seriallization, with different marshallign method for mongo and json                         |
+| gojson      | Mike       | Same interface for marshalling/unmarshalling as go/json, except with proper serialization of null arrays/maps |
+|             |            |                                                                                                               |
+| bfcodegen   | Mike       | Various codegen tools (run via go generate)                                                                   |
+|             |            |                                                                                                               |
+| rext        | Mike       | Regex Wrapper, wraps regexp with a better interface                                                           |
+| wmo         | Mike       | Mongo Wrapper, wraps mongodb with a better interface                                                          |
+|             |            |                                                                                                               |

TODO.md

@@ -0,0 +1,13 @@
+
+
+ - cronext
+
+ - cursortoken
+
+ - typed/geenric mongo wrapper
+
+ - error package
+
+- rfctime.DateOnly
+- rfctime.HMSTimeOnly
+- rfctime.NanoTimeOnly

cursortoken/direction.go

@@ -0,0 +1,8 @@
+package cursortoken
+
+type SortDirection string //@enum:type
+
+const (
+	SortASC  SortDirection = "ASC"
+	SortDESC SortDirection = "DESC"
+)

cursortoken/filter.go

@@ -0,0 +1,10 @@
+package cursortoken
+
+import (
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+type Filter interface {
+	FilterQuery() mongo.Pipeline
+	Pagination() (string, SortDirection, string, SortDirection)
+}

cursortoken/token.go

@@ -0,0 +1,184 @@
+package cursortoken
+
+import (
+	"encoding/base32"
+	"encoding/json"
+	"errors"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"strings"
+	"time"
+)
+
+type Mode string
+
+const (
+	CTMStart  Mode = "START"
+	CTMNormal Mode = "NORMAL"
+	CTMEnd    Mode = "END"
+)
+
+type Extra struct {
+	Timestamp *time.Time
+	Id        *string
+	Page      *int
+	PageSize  *int
+}
+
+type CursorToken struct {
+	Mode               Mode
+	ValuePrimary       string
+	ValueSecondary     string
+	Direction          SortDirection
+	DirectionSecondary SortDirection
+	PageSize           int
+	Extra              Extra
+}
+
+type cursorTokenSerialize struct {
+	ValuePrimary       *string        `json:"v1,omitempty"`
+	ValueSecondary     *string        `json:"v2,omitempty"`
+	Direction          *SortDirection `json:"dir,omitempty"`
+	DirectionSecondary *SortDirection `json:"dir2,omitempty"`
+	PageSize           *int           `json:"size,omitempty"`
+
+	ExtraTimestamp *time.Time `json:"ts,omitempty"`
+	ExtraId        *string    `json:"id,omitempty"`
+	ExtraPage      *int       `json:"pg,omitempty"`
+	ExtraPageSize  *int       `json:"sz,omitempty"`
+}
+
+func Start() CursorToken {
+	return CursorToken{
+		Mode:               CTMStart,
+		ValuePrimary:       "",
+		ValueSecondary:     "",
+		Direction:          "",
+		DirectionSecondary: "",
+		PageSize:           0,
+		Extra:              Extra{},
+	}
+}
+
+func End() CursorToken {
+	return CursorToken{
+		Mode:               CTMEnd,
+		ValuePrimary:       "",
+		ValueSecondary:     "",
+		Direction:          "",
+		DirectionSecondary: "",
+		PageSize:           0,
+		Extra:              Extra{},
+	}
+}
+
+func (c *CursorToken) Token() string {
+	if c.Mode == CTMStart {
+		return "@start"
+	}
+	if c.Mode == CTMEnd {
+		return "@end"
+	}
+
+	// We kinda manually implement omitempty for the CursorToken here
+	// because omitempty does not work for time.Time and otherwise we would always
+	// get weird time values when decoding a token that initially didn't have an Timestamp set
+	// For this usecase we treat Unix=0 as an empty timestamp
+
+	sertok := cursorTokenSerialize{}
+
+	if c.ValuePrimary != "" {
+		sertok.ValuePrimary = &c.ValuePrimary
+	}
+	if c.ValueSecondary != "" {
+		sertok.ValueSecondary = &c.ValueSecondary
+	}
+	if c.Direction != "" {
+		sertok.Direction = &c.Direction
+	}
+	if c.DirectionSecondary != "" {
+		sertok.DirectionSecondary = &c.DirectionSecondary
+	}
+	if c.PageSize != 0 {
+		sertok.PageSize = &c.PageSize
+	}
+
+	sertok.ExtraTimestamp = c.Extra.Timestamp
+	sertok.ExtraId = c.Extra.Id
+	sertok.ExtraPage = c.Extra.Page
+	sertok.ExtraPageSize = c.Extra.PageSize
+
+	body, err := json.Marshal(sertok)
+	if err != nil {
+		panic(err)
+	}
+
+	return "tok_" + base32.StdEncoding.EncodeToString(body)
+}
+
+func Decode(tok string) (CursorToken, error) {
+	if tok == "" {
+		return Start(), nil
+	}
+	if strings.ToLower(tok) == "@start" {
+		return Start(), nil
+	}
+	if strings.ToLower(tok) == "@end" {
+		return End(), nil
+	}
+
+	if !strings.HasPrefix(tok, "tok_") {
+		return CursorToken{}, errors.New("could not decode token, missing prefix")
+	}
+
+	body, err := base32.StdEncoding.DecodeString(tok[len("tok_"):])
+	if err != nil {
+		return CursorToken{}, err
+	}
+
+	var tokenDeserialize cursorTokenSerialize
+	err = json.Unmarshal(body, &tokenDeserialize)
+	if err != nil {
+		return CursorToken{}, err
+	}
+
+	token := CursorToken{Mode: CTMNormal}
+
+	if tokenDeserialize.ValuePrimary != nil {
+		token.ValuePrimary = *tokenDeserialize.ValuePrimary
+	}
+	if tokenDeserialize.ValueSecondary != nil {
+		token.ValueSecondary = *tokenDeserialize.ValueSecondary
+	}
+	if tokenDeserialize.Direction != nil {
+		token.Direction = *tokenDeserialize.Direction
+	}
+	if tokenDeserialize.DirectionSecondary != nil {
+		token.DirectionSecondary = *tokenDeserialize.DirectionSecondary
+	}
+	if tokenDeserialize.PageSize != nil {
+		token.PageSize = *tokenDeserialize.PageSize
+	}
+
+	token.Extra.Timestamp = tokenDeserialize.ExtraTimestamp
+	token.Extra.Id = tokenDeserialize.ExtraId
+	token.Extra.Page = tokenDeserialize.ExtraPage
+	token.Extra.PageSize = tokenDeserialize.ExtraPageSize
+
+	return token, nil
+}
+
+func (c *CursorToken) ValuePrimaryObjectId() (primitive.ObjectID, bool) {
+	if oid, err := primitive.ObjectIDFromHex(c.ValuePrimary); err == nil {
+		return oid, true
+	} else {
+		return primitive.ObjectID{}, false
+	}
+}
+
+func (c *CursorToken) ValueSecondaryObjectId() (primitive.ObjectID, bool) {
+	if oid, err := primitive.ObjectIDFromHex(c.ValueSecondary); err == nil {
+		return oid, true
+	} else {
+		return primitive.ObjectID{}, false
+	}
+}

go.mod

@@ -3,12 +3,22 @@ module gogs.mikescher.com/BlackForestBytes/goext
 go 1.19
 
 require (
+	github.com/jmoiron/sqlx v1.3.5
+	go.mongodb.org/mongo-driver v1.11.1
+	golang.org/x/crypto v0.4.0
 	golang.org/x/sys v0.3.0
 	golang.org/x/term v0.3.0
 )
 
 require (
-	github.com/jmoiron/sqlx v1.3.5 // indirect
+	github.com/golang/snappy v0.0.1 // indirect
-	go.mongodb.org/mongo-driver v1.11.1 // indirect
+	github.com/klauspost/compress v1.13.6 // indirect
-	golang.org/x/crypto v0.4.0 // indirect
+	github.com/montanaflynn/stats v0.0.0-20171201202039-1bf9dbcd8cbe // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/xdg-go/pbkdf2 v1.0.0 // indirect
+	github.com/xdg-go/scram v1.1.1 // indirect
+	github.com/xdg-go/stringprep v1.0.3 // indirect
+	github.com/youmark/pkcs8 v0.0.0-20181117223130-1be2e3e5546d // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/text v0.5.0 // indirect
 )

go.sum

@@ -1,25 +1,43 @@
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-sql-driver/mysql v1.6.0 h1:BCTh4TKNUYmOmMUcQ3IipzF5prigylS7XXjEkfCHuOE=
 github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/jmoiron/sqlx v1.3.5 h1:vFFPA71p1o5gAeqtEAwLU4dnX2napprKtHr7PYIcN3g=
 github.com/jmoiron/sqlx v1.3.5/go.mod h1:nRVWtLre0KfCLJvgxzCsLVMogSvQ1zNJtpYr2Ccp0mQ=
+github.com/klauspost/compress v1.13.6 h1:P76CopJELS0TiO2mebmnzgWaajssP/EszplttgQxcgc=
 github.com/klauspost/compress v1.13.6/go.mod h1:/3/Vjq9QcHkK5uEr5lBEmyoZ1iFhe47etQ6QUkpK6sk=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/lib/pq v1.2.0 h1:LXpIM/LZ5xGFhOpXAQUIMM1HdyqzVYM13zNdjCEEcA0=
 github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
+github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg=
 github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
+github.com/montanaflynn/stats v0.0.0-20171201202039-1bf9dbcd8cbe h1:iruDEfMl2E6fbMZ9s0scYfZQ84/6SPL6zC8ACM2oIL0=
 github.com/montanaflynn/stats v0.0.0-20171201202039-1bf9dbcd8cbe/go.mod h1:wL8QJuTMNUDYhXwkmfOly8iTdp5TEcJFWZD2D7SIkUc=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/tidwall/pretty v1.0.0 h1:HsD+QiTn7sK6flMKIvNmpqz1qrpP3Ps6jOKIKMooyg4=
 github.com/tidwall/pretty v1.0.0/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
+github.com/xdg-go/pbkdf2 v1.0.0 h1:Su7DPu48wXMwC3bs7MCNG+z4FhcyEuz5dlvchbq0B0c=
 github.com/xdg-go/pbkdf2 v1.0.0/go.mod h1:jrpuAogTd400dnrH08LKmI/xc1MbPOebTwRqcT5RDeI=
+github.com/xdg-go/scram v1.1.1 h1:VOMT+81stJgXW3CpHyqHN3AXDYIMsx56mEFrB37Mb/E=
 github.com/xdg-go/scram v1.1.1/go.mod h1:RaEWvsqvNKKvBPvcKeFjrG2cJqOkHTiyTpzz23ni57g=
+github.com/xdg-go/stringprep v1.0.3 h1:kdwGpVNwPFtjs98xCGkHjQtGKh86rDcRZN17QEMCOIs=
 github.com/xdg-go/stringprep v1.0.3/go.mod h1:W3f5j4i+9rC0kuIEJL0ky1VpHXQU3ocBgklLGvcBnW8=
+github.com/youmark/pkcs8 v0.0.0-20181117223130-1be2e3e5546d h1:splanxYIlg+5LfHAM6xpdFEAYOk8iySO56hMFq6uLyA=
 github.com/youmark/pkcs8 v0.0.0-20181117223130-1be2e3e5546d/go.mod h1:rHwXgn7JulP+udvsHwJoVG1YGAP6VLg4y9I5dyZdqmA=
 go.mongodb.org/mongo-driver v1.11.1 h1:QP0znIRTuL0jf1oBQoAoM0C6ZJfBK4kx0Uumtv1A7w8=
 go.mongodb.org/mongo-driver v1.11.1/go.mod h1:s7p5vEtfbeR1gYi6pnj3c3/urpbLv2T5Sfd6Rp2HBB8=
@@ -27,24 +45,25 @@ golang.org/x/crypto v0.0.0-20220622213112-05595931fe9d/go.mod h1:IxCIyHEi3zRg3s0
 golang.org/x/crypto v0.4.0 h1:UVQgzMY87xqpKNgb+kDsll2Igd33HszWHFLmpaRMq/8=
 golang.org/x/crypto v0.4.0/go.mod h1:3quD/ATkf6oY+rnes5c3ExXTbLc8mueNue5/DoinL80=
 golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
-golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.3.0 h1:w8ZOecv6NaNa/zC8944JTU3vz4u6Lagfk4RPQxv92NQ=
 golang.org/x/sys v0.3.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.1.0 h1:g6Z6vPFA9dYBAF7DWcH6sCcOntplXsDKcliusYijMlw=
-golang.org/x/term v0.1.0/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.3.0 h1:qoo4akIqOcDME5bhc/NgxUdovd6BSS2uMsVjB56q1xI=
 golang.org/x/term v0.3.0/go.mod h1:q750SLmJuPmVoN1blW3UFBPREJfb1KmY3vwxfr+nFDA=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.5.0 h1:OLmvp0KP+FVG99Ct/qFiL/Fhk4zp4QQnZ7b2U+5piUM=
+golang.org/x/text v0.5.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

langext/reflection.go

@@ -4,7 +4,7 @@ import (
 	"reflect"
 )
 
-var reflectBasicTypes = []reflect.Type{
+var reflectBasicTypes = map[reflect.Kind]reflect.Type{
 	reflect.Bool:       reflect.TypeOf(false),
 	reflect.Int:        reflect.TypeOf(int(0)),
 	reflect.Int8:       reflect.TypeOf(int8(0)),
@@ -109,3 +109,28 @@ func TryCast[T any](v any) (T, bool) {
 
 	return r4, true
 }
+
+func TryCastType(v any, dest reflect.Type) (any, bool) {
+
+	underlying := Underlying(reflect.TypeOf(v))
+
+	if underlying != Underlying(dest) {
+		return nil, false
+	}
+
+	r1 := reflect.ValueOf(v)
+
+	if !r1.CanConvert(underlying) {
+		return nil, false
+	}
+
+	r2 := r1.Convert(underlying)
+
+	if !r2.CanConvert(dest) {
+		return nil, false
+	}
+
+	r4 := r2.Convert(dest)
+
+	return r4.Interface(), true
+}

rfctime/interface_test.go

@@ -1,6 +1,7 @@
 package rfctime
 
 import (
+	"gogs.mikescher.com/BlackForestBytes/goext/tst"
 	"testing"
 	"time"
 )

rfctime/rfc3339.go

@@ -81,7 +81,7 @@ func (t *RFC3339Time) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
 		return errors.New(fmt.Sprintf("cannot unmarshal %v into RFC3339Time", bt))
 	}
 	var tt time.Time
-	err := bson.Unmarshal(data, &tt)
+	err := bson.RawValue{Type: bt, Value: data}.Unmarshal(&tt)
 	if err != nil {
 		return err
 	}
@@ -116,6 +116,12 @@ func (t RFC3339Time) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueRead
 		return err
 	}
 
+	if val.Kind() == reflect.Ptr {
+		val.Set(reflect.ValueOf(&t))
+	} else {
+		val.Set(reflect.ValueOf(t))
+	}
+
 	return nil
 }
 

wmo/collection.go

@@ -0,0 +1,66 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/mongo"
+	ct "gogs.mikescher.com/BlackForestBytes/goext/cursortoken"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"reflect"
+)
+
+type EntityID = any
+
+type fullTypeRef[TData any] struct {
+	IsPointer      bool
+	Kind           reflect.Kind
+	Type           reflect.Type
+	UnderlyingType reflect.Type
+	Name           string
+	Index          []int
+}
+
+type Coll[TData any] struct {
+	coll        *mongo.Collection
+	dataTypeMap map[string]fullTypeRef[TData]
+}
+
+func (c *Coll[TData]) Collection() *mongo.Collection {
+	return c.coll
+}
+
+func (c *Coll[TData]) Name() string {
+	return c.coll.Name()
+}
+
+func (c *Coll[TData]) Indexes() mongo.IndexView {
+	return c.coll.Indexes()
+}
+
+func (c *Coll[TData]) Drop(ctx context.Context) error {
+	return c.coll.Drop(ctx)
+}
+
+func (c *Coll[TData]) createToken(fieldPrimary string, dirPrimary ct.SortDirection, fieldSecondary *string, dirSecondary *ct.SortDirection, lastEntity TData, pageSize *int) (ct.CursorToken, error) {
+
+	valuePrimary, err := c.getFieldValueAsTokenString(lastEntity, fieldPrimary)
+	if err != nil {
+		return ct.CursorToken{}, err
+	}
+
+	valueSeconary := ""
+	if fieldSecondary != nil && dirSecondary != nil {
+		valueSeconary, err = c.getFieldValueAsTokenString(lastEntity, *fieldSecondary)
+		if err != nil {
+			return ct.CursorToken{}, err
+		}
+	}
+
+	return ct.CursorToken{
+		Mode:           ct.CTMNormal,
+		ValuePrimary:   valuePrimary,
+		ValueSecondary: valueSeconary,
+		Direction:      dirPrimary,
+		PageSize:       langext.Coalesce(pageSize, 0),
+		Extra:          ct.Extra{},
+	}, nil
+}

wmo/mongo.go

@@ -0,0 +1,11 @@
+package wmo
+
+import "go.mongodb.org/mongo-driver/mongo"
+
+func W[TData any](collection *mongo.Collection) *Coll[TData] {
+	c := Coll[TData]{coll: collection}
+
+	c.init()
+
+	return &c
+}

wmo/pagination.go

@@ -0,0 +1,69 @@
+package wmo
+
+import (
+	"go.mongodb.org/mongo-driver/bson"
+	ct "gogs.mikescher.com/BlackForestBytes/goext/cursortoken"
+)
+
+func CreatePagination[TData any](coll *Coll[TData], token ct.CursorToken, fieldPrimary string, sortPrimary ct.SortDirection, fieldSecondary *string, sortSecondary *ct.SortDirection, pageSize *int) ([]bson.D, error) {
+
+	cond := bson.A{}
+	sort := bson.D{}
+
+	valuePrimary, err := coll.getTokenValueAsMongoType(token.ValuePrimary, fieldPrimary)
+	if err != nil {
+		return nil, err
+	}
+
+	if sortPrimary == ct.SortASC {
+		// We sort ASC on <field> - so we want all entries newer ($gt) than the $primary
+		cond = append(cond, bson.M{fieldPrimary: bson.M{"$gt": valuePrimary}})
+		sort = append(sort, bson.E{Key: fieldPrimary, Value: +1})
+	} else if sortPrimary == ct.SortDESC {
+		// We sort DESC on <field> - so we want all entries older ($lt) than the $primary
+		cond = append(cond, bson.M{fieldPrimary: bson.M{"$lt": valuePrimary}})
+		sort = append(sort, bson.E{Key: fieldPrimary, Value: -1})
+	}
+
+	if fieldSecondary != nil && sortSecondary != nil && *fieldSecondary != fieldPrimary {
+
+		valueSecondary, err := coll.getTokenValueAsMongoType(token.ValueSecondary, *fieldSecondary)
+		if err != nil {
+			return nil, err
+		}
+
+		if *sortSecondary == ct.SortASC {
+
+			// the conflict-resolution condition, for entries with the _same_ <field> as the $primary we take the ones with a greater $secondary (= newer)
+			cond = append(cond, bson.M{"$and": bson.A{
+				bson.M{fieldPrimary: valuePrimary},
+				bson.M{*fieldSecondary: bson.M{"$gt": valueSecondary}},
+			}})
+
+			sort = append(sort, bson.E{Key: fieldPrimary, Value: +1})
+
+		} else if *sortSecondary == ct.SortDESC {
+
+			// the conflict-resolution condition, for entries with the _same_ <field> as the $primary we take the ones with a smaller $secondary (= older)
+			cond = append(cond, bson.M{"$and": bson.A{
+				bson.M{fieldPrimary: valuePrimary},
+				bson.M{*fieldSecondary: bson.M{"$lt": valueSecondary}},
+			}})
+
+			sort = append(sort, bson.E{Key: fieldPrimary, Value: -1})
+
+		}
+	}
+
+	pipeline := make([]bson.D, 0, 3)
+
+	pipeline = append(pipeline, bson.D{{Key: "$match", Value: bson.M{"$or": cond}}})
+
+	pipeline = append(pipeline, bson.D{{Key: "$sort", Value: sort}})
+
+	if pageSize != nil {
+		pipeline = append(pipeline, bson.D{{Key: "$limit", Value: int64(*pageSize + 1)}})
+	}
+
+	return pipeline, nil
+}

wmo/queryAggregate.go

@@ -0,0 +1,22 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+func (c *Coll[TData]) Aggregate(ctx context.Context, pipeline mongo.Pipeline, opts ...*options.AggregateOptions) ([]TData, error) {
+	cursor, err := c.coll.Aggregate(ctx, pipeline, opts...)
+	if err != nil {
+		return nil, err
+	}
+
+	res := make([]TData, 0, cursor.RemainingBatchLength())
+	err = cursor.All(ctx, &res)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}

wmo/queryDelete.go

@@ -0,0 +1,25 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+func (c *Coll[TData]) DeleteOne(ctx context.Context, id EntityID) error {
+	_, err := c.coll.DeleteOne(ctx, bson.M{"_id": id})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Coll[TData]) DeleteMany(ctx context.Context, filterQuery bson.M) (*mongo.DeleteResult, error) {
+	res, err := c.coll.DeleteMany(ctx, filterQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}

wmo/queryFind.go

@@ -0,0 +1,73 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+func (c *Coll[TData]) FindOne(ctx context.Context, filter bson.M) (TData, error) {
+	var res TData
+
+	err := c.coll.FindOne(ctx, filter).Decode(&res)
+	if err != nil {
+		return *new(TData), err
+	}
+
+	return res, nil
+}
+
+func (c *Coll[TData]) FindOneOpt(ctx context.Context, filter bson.M) (*TData, error) {
+	var res TData
+
+	err := c.coll.FindOne(ctx, filter).Decode(&res)
+	if err == mongo.ErrNoDocuments {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	return &res, nil
+}
+
+func (c *Coll[TData]) FindOneByID(ctx context.Context, id EntityID) (TData, error) {
+	var res TData
+
+	err := c.coll.FindOne(ctx, bson.M{"_id": id}).Decode(&res)
+	if err != nil {
+		return *new(TData), err
+	}
+
+	return res, nil
+}
+
+func (c *Coll[TData]) FindOneOptByID(ctx context.Context, id EntityID) (*TData, error) {
+	var res TData
+
+	err := c.coll.FindOne(ctx, bson.M{"_id": id}).Decode(&res)
+	if err == mongo.ErrNoDocuments {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	return &res, nil
+}
+
+func (c *Coll[TData]) Find(ctx context.Context, filter bson.M, opts ...*options.FindOptions) ([]TData, error) {
+	cursor, err := c.coll.Find(ctx, filter, opts...)
+	if err != nil {
+		return nil, err
+	}
+
+	res := make([]TData, 0, cursor.RemainingBatchLength())
+	err = cursor.All(ctx, &res)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}

wmo/queryInsert.go

@@ -0,0 +1,22 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson"
+)
+
+func (c *Coll[TData]) InsertOne(ctx context.Context, valueIn TData) (TData, error) {
+	insRes, err := c.coll.InsertOne(ctx, valueIn)
+	if err != nil {
+		return *new(TData), err
+	}
+
+	var res TData
+
+	err = c.coll.FindOne(ctx, bson.M{"_id": insRes.InsertedID}).Decode(&res)
+	if err != nil {
+		return *new(TData), err
+	}
+
+	return res, nil
+}

wmo/queryList.go

@@ -0,0 +1,85 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson"
+	ct "gogs.mikescher.com/BlackForestBytes/goext/cursortoken"
+)
+
+func (c *Coll[TData]) List(ctx context.Context, filter ct.Filter, pageSize *int, inTok ct.CursorToken) ([]TData, ct.CursorToken, error) {
+	if inTok.Mode == ct.CTMEnd {
+		return make([]TData, 0), ct.End(), nil
+	}
+
+	pipeline := filter.FilterQuery()
+
+	pf1, pd1, pf2, pd2 := filter.Pagination()
+
+	sortPrimary := pf1
+	sortDirPrimary := pd1
+	sortSecondary := &pf2
+	sortDirSecondary := &pd2
+
+	if pf1 == pf2 {
+		sortSecondary = nil
+		sortDirSecondary = nil
+	}
+
+	paginationPipeline, err := CreatePagination(c, inTok, sortPrimary, sortDirPrimary, sortSecondary, sortDirSecondary, pageSize)
+	if err != nil {
+		return nil, ct.CursorToken{}, err
+	}
+
+	pipeline = append(pipeline, paginationPipeline...)
+
+	cursor, err := c.coll.Aggregate(ctx, pipeline)
+	if err != nil {
+		return nil, ct.CursorToken{}, err
+	}
+
+	entities := make([]TData, 0, cursor.RemainingBatchLength()+1)
+	for (pageSize == nil || len(entities) != *pageSize) && cursor.Next(ctx) {
+		var entry TData
+		err = cursor.Decode(&entry)
+		if err != nil {
+			return nil, ct.CursorToken{}, err
+		}
+		entities = append(entities, entry)
+	}
+
+	if pageSize == nil || len(entities) <= *pageSize || !cursor.TryNext(ctx) {
+		return entities, ct.End(), nil
+	}
+
+	last := entities[len(entities)-1]
+
+	nextToken, _ := c.createToken(sortPrimary, sortDirPrimary, sortSecondary, sortDirSecondary, last, pageSize)
+
+	return entities, nextToken, nil
+}
+
+func (c *Coll[TData]) Count(ctx context.Context, filter ct.Filter) (int64, error) {
+	pipeline := filter.FilterQuery()
+
+	pipeline = append(pipeline, bson.D{{Key: "$count", Value: "c"}})
+
+	cursor, err := c.coll.Aggregate(ctx, pipeline)
+	if err != nil {
+		return 0, err
+	}
+
+	type res struct {
+		Count int64 `bson:"c"`
+	}
+
+	if cursor.Next(ctx) {
+		v := res{}
+		err = cursor.Decode(&v)
+		if err != nil {
+			return 0, err
+		}
+		return v.Count, nil
+	}
+
+	return 0, nil
+}

wmo/queryUpdate.go

@@ -0,0 +1,66 @@
+package wmo
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+func (c *Coll[TData]) FindOneAndUpdate(ctx context.Context, filterQuery bson.M, updateQuery bson.M) (TData, error) {
+	var res TData
+
+	err := c.coll.FindOneAndUpdate(ctx, filterQuery, updateQuery, options.FindOneAndUpdate().SetReturnDocument(options.After)).Decode(&res)
+	if err != nil {
+		return *new(TData), err
+	}
+
+	return res, nil
+}
+
+func (c *Coll[TData]) UpdateOne(ctx context.Context, filterQuery bson.M, updateQuery bson.M) error {
+	_, err := c.coll.UpdateOne(ctx, filterQuery, updateQuery)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Coll[TData]) UpdateOneByID(ctx context.Context, id EntityID, updateQuery bson.M) error {
+	_, err := c.coll.UpdateOne(ctx, bson.M{"_id": id}, updateQuery)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Coll[TData]) UpdateMany(ctx context.Context, filterQuery bson.M, updateQuery bson.M) (*mongo.UpdateResult, error) {
+	res, err := c.coll.UpdateMany(ctx, filterQuery, updateQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}
+
+func (c *Coll[TData]) ReplaceOne(ctx context.Context, id EntityID, value TData) error {
+	_, err := c.coll.UpdateOne(ctx, bson.M{"_id": id}, value)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Coll[TData]) FindOneAndReplace(ctx context.Context, id EntityID, value TData) (TData, error) {
+	var res TData
+
+	err := c.coll.FindOneAndUpdate(ctx, bson.M{"_id": id}, value, options.FindOneAndUpdate().SetReturnDocument(options.After)).Decode(&res)
+	if err != nil {
+		return *new(TData), err
+	}
+
+	return res, nil
+}

wmo/reflection.go

@@ -0,0 +1,294 @@
+package wmo
+
+import (
+	"errors"
+	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"reflect"
+	"strconv"
+	"time"
+)
+
+func (c *Coll[TData]) init() {
+
+	c.dataTypeMap = make(map[string]fullTypeRef[TData])
+
+	example := *new(TData)
+
+	v := reflect.ValueOf(example)
+
+	c.initFields("", v, make([]int, 0))
+
+}
+
+func (c *Coll[TData]) initFields(prefix string, rval reflect.Value, idxarr []int) {
+
+	rtyp := rval.Type()
+
+	for i := 0; i < rtyp.NumField(); i++ {
+
+		rsfield := rtyp.Field(i)
+		rvfield := rval.Field(i)
+
+		if !rsfield.IsExported() {
+			continue
+		}
+
+		bsonkey, found := rsfield.Tag.Lookup("bson")
+		if !found || bsonkey == "-" {
+			continue
+		}
+
+		fullKey := prefix + bsonkey
+
+		newIdxArr := langext.ArrCopy(idxarr)
+		newIdxArr = append(newIdxArr, i)
+
+		if rvfield.Type().Kind() == reflect.Pointer {
+
+			c.dataTypeMap[fullKey] = fullTypeRef[TData]{
+				IsPointer:      true,
+				Kind:           rvfield.Type().Elem().Kind(),
+				Type:           rvfield.Type().Elem(),
+				UnderlyingType: langext.Underlying(rvfield.Type().Elem()),
+				Name:           rsfield.Name,
+				Index:          newIdxArr,
+			}
+
+		} else {
+
+			c.dataTypeMap[fullKey] = fullTypeRef[TData]{
+				IsPointer:      false,
+				Kind:           rvfield.Type().Kind(),
+				Type:           rvfield.Type(),
+				UnderlyingType: langext.Underlying(rvfield.Type()),
+				Name:           rsfield.Name,
+				Index:          newIdxArr,
+			}
+
+		}
+
+		if rvfield.Kind() == reflect.Struct {
+			c.initFields(fullKey+".", rvfield, newIdxArr)
+		}
+
+	}
+
+}
+
+func (c *Coll[TData]) getTokenValueAsMongoType(value string, fieldName string) (any, error) {
+	fref := c.dataTypeMap[fieldName]
+
+	if fref.IsPointer && value == "" {
+		pointertype := reflect.New(fref.Type).Type()
+		nilvalue := reflect.Zero(pointertype)
+		outvalue := nilvalue.Interface()
+		return outvalue, nil
+	}
+
+	pointerize := func(v any) any {
+		if !fref.IsPointer {
+			return v
+		}
+
+		rval1 := reflect.ValueOf(v)
+		rval2 := rval1.Convert(fref.Type)
+		rval3 := reflect.New(fref.Type)
+		rval3.Elem().Set(rval2)
+		return rval3.Interface()
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf("") {
+
+		rt, ok := langext.TryCastType(value, fref.Type)
+		if !ok {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' from string to %s", fieldName, fref.Type.String()))
+		}
+
+		return pointerize(rt), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(time.Time{}) {
+
+		t, err := time.Parse(time.RFC3339Nano, value)
+		if err != nil {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' as time.Time ('%s')", fieldName, value))
+		}
+
+		rt, ok := langext.TryCastType(t, fref.Type)
+		if !ok {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' from time.Time to %s", fieldName, fref.Type.String()))
+		}
+
+		return pointerize(rt), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(int(0)) {
+
+		t, err := strconv.ParseInt(value, 10, 64)
+		if err != nil {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' as int64 ('%s')", fieldName, value))
+		}
+
+		rt, ok := langext.TryCastType(int(t), fref.Type)
+		if !ok {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' from int to %s", fieldName, fref.Type.String()))
+		}
+
+		return pointerize(rt), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(int32(0)) {
+
+		t, err := strconv.ParseInt(value, 10, 64)
+		if err != nil {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' as int32 ('%s')", fieldName, value))
+		}
+
+		rt, ok := langext.TryCastType(int32(t), fref.Type)
+		if !ok {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' from int32 to %s", fieldName, fref.Type.String()))
+		}
+
+		return pointerize(rt), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(int64(0)) {
+
+		t, err := strconv.ParseInt(value, 10, 64)
+		if err != nil {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' as int64 ('%s')", fieldName, value))
+		}
+
+		rt, ok := langext.TryCastType(int64(t), fref.Type)
+		if !ok {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' from int64 to %s", fieldName, fref.Type.String()))
+		}
+
+		return pointerize(rt), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(float32(0)) {
+
+		t, err := strconv.ParseFloat(value, 64)
+		if err != nil {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' as float32 ('%s')", fieldName, value))
+		}
+
+		rt, ok := langext.TryCastType(float32(t), fref.Type)
+		if !ok {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' from float32 to %s", fieldName, fref.Type.String()))
+		}
+
+		return pointerize(rt), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(float64(0)) {
+
+		t, err := strconv.ParseFloat(value, 64)
+		if err != nil {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' as float64 ('%s')", fieldName, value))
+		}
+
+		rt, ok := langext.TryCastType(float64(t), fref.Type)
+		if !ok {
+			return nil, errors.New(fmt.Sprintf("failed to parse field '%s' from float64 to %s", fieldName, fref.Type.String()))
+		}
+
+		return pointerize(rt), nil
+	}
+
+	return nil, errors.New(fmt.Sprintf("failed to parse field '%s' of type %s (%s)", fieldName, fref.Type.String(), fref.UnderlyingType.String()))
+}
+
+func (c *Coll[TData]) getFieldValueAsTokenString(entity TData, fieldName string) (string, error) {
+	fref := c.dataTypeMap[fieldName]
+
+	realValue := c.getFieldValue(entity, fieldName)
+
+	if langext.IsNil(realValue) {
+		return "", nil
+	}
+
+	reflValue := reflect.ValueOf(realValue)
+	if reflValue.Kind() == reflect.Pointer {
+		reflValue = reflValue.Elem()
+		realValue = reflValue.Interface()
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf("") {
+
+		rt, ok := langext.TryCastType(realValue, reflect.TypeOf(""))
+		if !ok {
+			return "", errors.New(fmt.Sprintf("failed to cast field '%s' from %s to string", fieldName, fref.Type.String()))
+		}
+
+		return rt.(string), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(time.Time{}) {
+		rt, ok := langext.TryCastType(realValue, reflect.TypeOf(time.Time{}))
+		if !ok {
+			return "", errors.New(fmt.Sprintf("failed to cast field '%s' from %s to time.Time", fieldName, fref.Type.String()))
+		}
+
+		return rt.(time.Time).Format(time.RFC3339Nano), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(int(0)) {
+		rt, ok := langext.TryCastType(realValue, reflect.TypeOf(int(0)))
+		if !ok {
+			return "", errors.New(fmt.Sprintf("failed to cast field '%s' from %s to int", fieldName, fref.Type.String()))
+		}
+
+		return strconv.Itoa(rt.(int)), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(int32(0)) {
+		rt, ok := langext.TryCastType(realValue, reflect.TypeOf(int32(0)))
+		if !ok {
+			return "", errors.New(fmt.Sprintf("failed to cast field '%s' from %s to int32", fieldName, fref.Type.String()))
+		}
+
+		return strconv.FormatInt(int64(rt.(int32)), 10), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(int64(0)) {
+		rt, ok := langext.TryCastType(realValue, reflect.TypeOf(int64(0)))
+		if !ok {
+			return "", errors.New(fmt.Sprintf("failed to cast field '%s' from %s to int64", fieldName, fref.Type.String()))
+		}
+
+		return strconv.FormatInt(rt.(int64), 10), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(float32(0)) {
+		rt, ok := langext.TryCastType(realValue, reflect.TypeOf(float32(0)))
+		if !ok {
+			return "", errors.New(fmt.Sprintf("failed to cast field '%s' from %s to float32", fieldName, fref.Type.String()))
+		}
+
+		return strconv.FormatFloat(float64(rt.(float32)), 'f', -1, 32), nil
+	}
+
+	if fref.UnderlyingType == reflect.TypeOf(float64(0)) {
+		rt, ok := langext.TryCastType(realValue, reflect.TypeOf(float64(0)))
+		if !ok {
+			return "", errors.New(fmt.Sprintf("failed to cast field '%s' from %s to float64", fieldName, fref.Type.String()))
+		}
+
+		return strconv.FormatFloat(rt.(float64), 'f', -1, 64), nil
+	}
+
+	return "", errors.New(fmt.Sprintf("failed to parse field '%s' of type %s (%s)", fieldName, fref.Type.String(), fref.UnderlyingType.String()))
+}
+
+func (c *Coll[TData]) getFieldType(fieldName string) fullTypeRef[TData] {
+	return c.dataTypeMap[fieldName]
+}
+
+func (c *Coll[TData]) getFieldValue(data TData, fieldName string) any {
+	fref := c.dataTypeMap[fieldName]
+	rval := reflect.ValueOf(data)
+	return rval.FieldByIndex(fref.Index).Interface()
+}

wmo/reflection_test.go

@@ -0,0 +1,160 @@
+package wmo
+
+import (
+	"go.mongodb.org/mongo-driver/mongo"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"gogs.mikescher.com/BlackForestBytes/goext/tst"
+	"testing"
+	"time"
+)
+
+func TestReflectionGetFieldType(t *testing.T) {
+
+	type IDType string
+
+	type TestData struct {
+		ID    IDType    `bson:"_id"`
+		CDate time.Time `bson:"cdate"`
+		Sub   struct {
+			A string `bson:"a"`
+		} `bson:"sub"`
+		Str string `bson:"str"`
+		Ptr *int   `bson:"ptr"`
+	}
+
+	coll := W[TestData](&mongo.Collection{})
+
+	coll.init()
+
+	t0 := time.Now()
+
+	d := TestData{
+		ID:    "1",
+		CDate: t0,
+		Sub: struct {
+			A string `bson:"a"`
+		}{
+			A: "2",
+		},
+		Str: "3",
+		Ptr: langext.Ptr(4),
+	}
+
+	tst.AssertEqual(t, coll.getFieldType("_id").Kind.String(), "string")
+	tst.AssertEqual(t, coll.getFieldType("_id").Type.String(), "wmo.IDType")
+	tst.AssertEqual(t, coll.getFieldType("_id").Name, "ID")
+	tst.AssertEqual(t, coll.getFieldType("_id").IsPointer, false)
+	tst.AssertEqual(t, coll.getFieldValue(d, "_id").(IDType), "1")
+
+	tst.AssertEqual(t, coll.getFieldType("cdate").Kind.String(), "struct")
+	tst.AssertEqual(t, coll.getFieldType("cdate").Type.String(), "time.Time")
+	tst.AssertEqual(t, coll.getFieldType("cdate").Name, "CDate")
+	tst.AssertEqual(t, coll.getFieldType("cdate").IsPointer, false)
+	tst.AssertEqual(t, coll.getFieldValue(d, "cdate").(time.Time), t0)
+
+	tst.AssertEqual(t, coll.getFieldType("sub.a").Kind.String(), "string")
+	tst.AssertEqual(t, coll.getFieldType("sub.a").Type.String(), "string")
+	tst.AssertEqual(t, coll.getFieldType("sub.a").Name, "A")
+	tst.AssertEqual(t, coll.getFieldType("sub.a").IsPointer, false)
+	tst.AssertEqual(t, coll.getFieldValue(d, "sub.a").(string), "2")
+
+	tst.AssertEqual(t, coll.getFieldType("str").Kind.String(), "string")
+	tst.AssertEqual(t, coll.getFieldType("str").Type.String(), "string")
+	tst.AssertEqual(t, coll.getFieldType("str").Name, "Str")
+	tst.AssertEqual(t, coll.getFieldType("str").IsPointer, false)
+	tst.AssertEqual(t, coll.getFieldValue(d, "str").(string), "3")
+
+	tst.AssertEqual(t, coll.getFieldType("ptr").Kind.String(), "int")
+	tst.AssertEqual(t, coll.getFieldType("ptr").Type.String(), "int")
+	tst.AssertEqual(t, coll.getFieldType("ptr").Name, "Ptr")
+	tst.AssertEqual(t, coll.getFieldType("ptr").IsPointer, true)
+	tst.AssertEqual(t, *coll.getFieldValue(d, "ptr").(*int), 4)
+}
+
+func TestReflectionGetTokenValueAsMongoType(t *testing.T) {
+
+	type IDType string
+
+	type TestData struct {
+		ID    IDType    `bson:"_id"`
+		CDate time.Time `bson:"cdate"`
+		Sub   struct {
+			A string `bson:"a"`
+		} `bson:"sub"`
+		Str string `bson:"str"`
+		Ptr *int   `bson:"ptr"`
+		Num int    `bson:"num"`
+	}
+
+	coll := W[TestData](&mongo.Collection{})
+
+	coll.init()
+
+	gtvasmt := func(value string, fieldName string) any {
+		v, err := coll.getTokenValueAsMongoType(value, fieldName)
+		if err != nil {
+			t.Errorf("%s", "failed to getTokenValueAsMongoType")
+		}
+		return v
+	}
+
+	tst.AssertEqual(t, gtvasmt("hello", "str").(string), "hello")
+	tst.AssertEqual(t, gtvasmt("4", "num").(int), 4)
+	tst.AssertEqual(t, gtvasmt("asdf", "_id").(IDType), "asdf")
+	tst.AssertEqual(t, gtvasmt("", "ptr").(*int), nil)
+	tst.AssertEqual(t, *(gtvasmt("123", "ptr").(*int)), 123)
+}
+
+func TestReflectionGetFieldValueAsTokenString(t *testing.T) {
+
+	type IDType string
+
+	type TestData struct {
+		ID    IDType    `bson:"_id"`
+		CDate time.Time `bson:"cdate"`
+		Sub   struct {
+			A string `bson:"a"`
+		} `bson:"sub"`
+		Str  string  `bson:"str"`
+		Ptr  *int    `bson:"ptr"`
+		Num  int     `bson:"num"`
+		Ptr2 *int    `bson:"ptr2"`
+		FFF  float64 `bson:"fff"`
+	}
+
+	coll := W[TestData](&mongo.Collection{})
+
+	coll.init()
+
+	t0 := time.Now()
+
+	d := TestData{
+		ID:    "1",
+		CDate: t0,
+		Sub: struct {
+			A string `bson:"a"`
+		}{
+			A: "2",
+		},
+		Str:  "3",
+		Ptr:  langext.Ptr(4),
+		Num:  22,
+		FFF:  22.5,
+		Ptr2: nil,
+	}
+
+	gfvats := func(value TestData, fieldName string) string {
+		v, err := coll.getFieldValueAsTokenString(value, fieldName)
+		if err != nil {
+			t.Errorf("%s", "failed to getTokenValueAsMongoType")
+		}
+		return v
+	}
+
+	tst.AssertEqual(t, gfvats(d, "str"), "3")
+	tst.AssertEqual(t, gfvats(d, "num"), "22")
+	tst.AssertEqual(t, gfvats(d, "_id"), "1")
+	tst.AssertEqual(t, gfvats(d, "ptr"), "4")
+	tst.AssertEqual(t, gfvats(d, "ptr2"), "")
+	tst.AssertEqual(t, gfvats(d, "fff"), "22.5")
+}