-
Notifications
You must be signed in to change notification settings - Fork 0
/
database.go
138 lines (123 loc) · 3.25 KB
/
database.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
package main
import (
"context"
"encoding/json"
"fmt"
"net/http"
"sort"
"time"
"github.com/cube2222/octosql/octosql"
_ "github.com/jackc/pgx/stdlib"
"github.com/cube2222/octosql/physical"
"github.com/cube2222/octosql/plugins"
)
var tableInternalNames = map[string]string{
"addresses": "address/random_address",
"companies": "company/random_company",
"users": "users/random_user",
}
func Creator(ctx context.Context, configUntyped plugins.ConfigDecoder) (physical.Database, error) {
return &Database{}, nil
}
type Database struct {
}
func (d *Database) ListTables(ctx context.Context) ([]string, error) {
return []string{
"addresses",
"companies",
"users",
}, nil
}
func (d *Database) GetTable(ctx context.Context, name string) (physical.DatasourceImplementation, physical.Schema, error) {
internalName, ok := tableInternalNames[name]
if !ok {
return nil, physical.Schema{}, fmt.Errorf("table %s not found", name)
}
req, err := http.NewRequest("GET", fmt.Sprintf("https://random-data-api.com/api/%s", internalName), nil)
if err != nil {
return nil, physical.Schema{}, fmt.Errorf("couldn't create request to get sample data: %w", err)
}
req = req.WithContext(ctx)
res, err := http.DefaultClient.Do(req)
if err != nil {
return nil, physical.Schema{}, fmt.Errorf("couldn't get sample data: %w", err)
}
defer res.Body.Close()
var data map[string]interface{}
if err := json.NewDecoder(res.Body).Decode(&data); err != nil {
return nil, physical.Schema{}, fmt.Errorf("couldn't decode sample data: %w", err)
}
fieldNames := make([]string, 0, len(data))
for k := range data {
fieldNames = append(fieldNames, k)
}
sort.Strings(fieldNames)
fields := make([]physical.SchemaField, len(fieldNames))
for i := range fieldNames {
fields[i] = physical.SchemaField{
Name: fieldNames[i],
Type: getOctoSQLType(data[fieldNames[i]]),
}
}
return &datasourcePhysical{
internalName: internalName,
},
physical.Schema{
Fields: fields,
TimeField: -1,
},
nil
}
func getOctoSQLType(value interface{}) octosql.Type {
switch value := value.(type) {
case int:
return octosql.Int
case bool:
return octosql.Boolean
case float64:
return octosql.Float
case string:
return octosql.String
case time.Time:
return octosql.Time
case map[string]interface{}:
fieldNames := make([]string, 0, len(value))
for k := range value {
fieldNames = append(fieldNames, k)
}
sort.Strings(fieldNames)
fields := make([]octosql.StructField, len(value))
for i := range fieldNames {
fields[i] = octosql.StructField{
Name: fieldNames[i],
Type: getOctoSQLType(value[fieldNames[i]]),
}
}
return octosql.Type{
TypeID: octosql.TypeIDStruct,
Struct: struct{ Fields []octosql.StructField }{Fields: fields},
}
case []interface{}:
var elementType *octosql.Type
for i := range value {
if elementType != nil {
t := octosql.TypeSum(*elementType, getOctoSQLType(value[i]))
elementType = &t
} else {
t := getOctoSQLType(value[i])
elementType = &t
}
}
return octosql.Type{
TypeID: octosql.TypeIDList,
List: struct {
Element *octosql.Type
}{
Element: elementType,
},
}
case nil:
return octosql.Null
}
panic(fmt.Sprintf("unexhaustive json input value match: %T %+v", value, value))
}