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query.go
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query.go
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// Package query implements querying through the Salesforce data service.
// It is a non-trivial problem because:
//
// - The API response shape is weird
// - Subqueries can themselves be paginated.
//
// The first is generally manageable and nothing so out of the ordinary.
// The second however is a big problem from an API/interface perspective.
// It doesn't make sense to paginate subqueries to a caller,
// because they probably don't have the context to use the subquery.
// It's also just incredibly difficult to program the caller-based pagination of subqueries.
//
// So we choose to hide the subquery pagination as an implementation detail.
// Again, not ideal, but probably the best choice.
//
// We do, however, still support top-level query pagination.
package query
import (
"encoding/json"
"fmt"
"net/url"
)
type result struct {
Done bool
TotalSize int
NextRecordsUrl string
Records []map[string]interface{}
}
func recordsFromMapRecords(q queryer, records []map[string]interface{}) ([]Record, error) {
res := make([]Record, len(records))
for i, rec := range records {
rec, err := recordFromMapRecord(q, rec)
if err != nil {
return nil, err
}
res[i] = rec
}
return res, nil
}
func recordFromMapRecord(q queryer, rec map[string]interface{}) (Record, error) {
res := Record{
Raw: rec,
Fields: make(map[string]interface{}, len(rec)-1),
}
for k, v := range rec {
if k == "attributes" {
attrs := v.(map[string]interface{})
res.Attributes.Type = attrs["type"].(string)
res.Attributes.Url, _ = attrs["url"].(string)
} else if vm, ok := v.(map[string]interface{}); ok && vm["records"] != nil {
if _, isRelationList := vm["done"]; isRelationList {
subrecs, err := recordsFromMapRecords(q, toStrIfaceMapSlice(vm["records"].([]interface{})))
if err != nil {
return res, err
}
if !vm["done"].(bool) {
err := q.getAllPages(vm["nextRecordsUrl"].(string), func(records []Record) bool {
subrecs = append(subrecs, records...)
return true
})
if err != nil {
return res, err
}
}
res.Fields[k] = subrecs
} else {
rec, err := recordFromMapRecord(q, vm)
if err != nil {
return res, err
}
res.Fields[k] = rec
}
} else {
res.Fields[k] = v
}
}
return res, nil
}
type Record struct {
Attributes struct {
Type string
Url string
}
Fields map[string]interface{}
Raw map[string]interface{}
}
type Options struct {
apiVersion string
cmd string
tooling bool
instanceUrl string
tail string
querystring string
httpGet func(string) ([]byte, error)
}
type PageCallback func([]Record) bool
func (o Options) UrlTail() string {
tail := o.tail
if tail == "" {
cmd := o.cmd
if o.tooling {
cmd = "tooling/" + cmd
}
tail = fmt.Sprintf("/services/data/%s/%s", o.apiVersion, cmd)
}
query := ""
if o.querystring != "" {
query = "?q=" + url.QueryEscape(o.querystring)
}
return fmt.Sprintf("%s%s", tail, query)
}
type Option func(*Options)
func All(o *Options) {
o.cmd = "queryAll"
}
func Tooling(o *Options) {
o.tooling = true
}
func InstanceUrl(url string) Option {
return func(o *Options) {
o.instanceUrl = url
}
}
func Tail(tail string) Option {
return func(o *Options) {
o.tail = tail
}
}
func ApiVersion(v string) Option {
return func(o *Options) {
o.apiVersion = v
}
}
func QS(v string) Option {
return func(o *Options) {
o.querystring = v
}
}
type HttpGetter func(string) ([]byte, error)
func HttpGet(f HttpGetter) Option {
return func(o *Options) {
o.httpGet = f
}
}
func Query(cb PageCallback, options ...Option) error {
opts := Options{cmd: "query"}
for _, option := range options {
option(&opts)
}
q := queryer{opts.instanceUrl, opts.httpGet}
return q.getAllPages(opts.UrlTail(), cb)
}
type queryer struct {
instanceUrl string
httpGet HttpGetter
}
func (q queryer) getAllPages(nextRecordsUrl string, cb PageCallback) error {
done := false
for !done {
body, err := q.httpGet(fmt.Sprintf("%s%s", q.instanceUrl, nextRecordsUrl))
if err != nil {
return err
}
currResult := result{}
if err := json.Unmarshal(body, &currResult); err != nil {
return err
}
records, err := recordsFromMapRecords(q, currResult.Records)
if err != nil {
return err
}
getNextPage := cb(records)
if !getNextPage {
break
}
done = currResult.Done
nextRecordsUrl = currResult.NextRecordsUrl
}
return nil
}
func Eager(options ...Option) ([]Record, error) {
records := make([]Record, 0, 128)
err := Query(func(children []Record) bool {
records = append(records, children...)
return true
}, options...)
return records, err
}
func toStrIfaceMapSlice(i2i []interface{}) []map[string]interface{} {
res := make([]map[string]interface{}, len(i2i))
for i, m := range i2i {
res[i] = m.(map[string]interface{})
}
return res
}