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package data
import (
"context"
"fmt"
"strings"
"github.com/hairyhenderson/gomplate/v4/coll"
"github.com/hairyhenderson/gomplate/v4/internal/datafs"
)
// readMerge demultiplexes a `merge:` datasource. The 'args' parameter currently
// has no meaning for this source.
//
// URI format is 'merge:<source 1>|<source 2>[|<source n>...]' where `<source #>`
// is a supported URI or a pre-defined alias name.
//
// Query strings and fragments are interpreted relative to the merged data, not
// the source data. To merge datasources with query strings or fragments, define
// separate sources first and specify the alias names. HTTP headers are also not
// supported directly.
func (d *Data) readMerge(ctx context.Context, source *Source, _ ...string) ([]byte, error) {
opaque := source.URL.Opaque
parts := strings.Split(opaque, "|")
if len(parts) < 2 {
return nil, fmt.Errorf("need at least 2 datasources to merge")
}
data := make([]map[string]interface{}, len(parts))
for i, part := range parts {
// supports either URIs or aliases
subSource, err := d.lookupSource(part)
if err != nil {
// maybe it's a relative filename?
u, uerr := datafs.ParseSourceURL(part)
if uerr != nil {
return nil, uerr
}
subSource = &Source{
Alias: part,
URL: u,
}
}
subSource.inherit(source)
b, err := d.readSource(ctx, subSource)
if err != nil {
return nil, fmt.Errorf("couldn't read datasource '%s': %w", part, err)
}
mimeType, err := subSource.mimeType("")
if err != nil {
return nil, fmt.Errorf("failed to read datasource %s: %w", subSource.URL, err)
}
data[i], err = parseMap(mimeType, string(b))
if err != nil {
return nil, err
}
}
// Merge the data together
b, err := mergeData(data)
if err != nil {
return nil, err
}
source.mediaType = yamlMimetype
return b, nil
}
func mergeData(data []map[string]interface{}) (out []byte, err error) {
dst := data[0]
data = data[1:]
dst, err = coll.Merge(dst, data...)
if err != nil {
return nil, err
}
s, err := ToYAML(dst)
if err != nil {
return nil, err
}
return []byte(s), nil
}
func parseMap(mimeType, data string) (map[string]interface{}, error) {
datum, err := parseData(mimeType, data)
if err != nil {
return nil, err
}
var m map[string]interface{}
switch datum := datum.(type) {
case map[string]interface{}:
m = datum
default:
return nil, fmt.Errorf("unexpected data type '%T' for datasource (type %s); merge: can only merge maps", datum, mimeType)
}
return m, nil
}
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