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package main
import (
"bytes"
"encoding/json"
"log"
"net/http"
"net/url"
//"io/ioutil"
)
/*
Routines to make (cached) API calls to Octopart and merge results into BOM
LineItems.
*/
var pricingSource *OctopartClient
type OctopartClient struct {
ApiKey string
RemoteHost string
client *http.Client
infoCache map[string]interface{}
}
func NewOctopartClient(apikey string) *OctopartClient {
oc := &OctopartClient{ApiKey: apikey,
RemoteHost: "https://octopart.com"}
oc.client = &http.Client{}
oc.infoCache = make(map[string]interface{})
return oc
}
func openPricingSource() {
// TODO: pass through octopart API key here
pricingSource = NewOctopartClient("")
}
func (oc *OctopartClient) apiCall(method string, params map[string]string) (map[string]interface{}, error) {
paramString := "?apikey=" + oc.ApiKey
// TODO: assert clean-ness of params
// TODO: use url.Values instead...
for key := range params {
paramString += "&" + url.QueryEscape(key) + "=" + url.QueryEscape(params[key])
}
paramStringUnescaped, _ := url.QueryUnescape(paramString) // TODO: err
log.Println("Fetching: " + oc.RemoteHost + "/api/v2/" + method + paramStringUnescaped)
resp, err := oc.client.Get(oc.RemoteHost + "/api/v2/" + method + paramString)
if err != nil {
return nil, err
}
if resp.StatusCode != 200 {
return nil, Error("Octopart API call error: " + resp.Status)
}
result := make(map[string]interface{})
defer resp.Body.Close()
//body, err := ioutil.ReadAll(resp.Body)
//if err != nil {
// return nil, err
//}
//body = append(body, '\n')
//dec := json.NewDecoder(bytes.NewReader(body))
dec := json.NewDecoder(resp.Body)
if err = dec.Decode(&result); err != nil {
return nil, err
}
return result, nil
}
// this method doesn't check internal cache, but it does append to it
func (oc *OctopartClient) bomApiCall(manufacturers, mpns []string) ([]map[string]interface{}, error) {
// TODO: check len(mpns) == len(manufacturers)
queryList := make([]map[string]string, len(mpns))
listItem := make(map[string]string)
for i, _ := range mpns {
listItem = make(map[string]string)
listItem["mpn_or_sku"] = mpns[i]
listItem["manufacturer"] = manufacturers[i]
listItem["limit"] = "1"
listItem["reference"] = manufacturers[i] + "|" + mpns[i]
queryList[i] = listItem
}
linesBuffer := new(bytes.Buffer)
enc := json.NewEncoder(linesBuffer)
if err := enc.Encode(queryList); err != nil {
return nil, err
}
response, err := oc.apiCall("bom/match", map[string]string{"lines": linesBuffer.String()})
if err != nil {
return nil, err
}
// TODO: just grabbing first result for now; user can make better specification later
ret := make([]map[string]interface{}, len(mpns))
for i, rawresult := range response["results"].([]interface{}) {
result := rawresult.(map[string]interface{})
hits := int(result["hits"].(float64))
reference := result["reference"].(string)
if hits == 0 {
ret[i] = nil
oc.infoCache[reference] = nil
} else {
ret[i] = result["items"].([]interface{})[0].(map[string]interface{})
oc.infoCache[reference] = ret[i]
}
}
return ret, nil
}
// this method checks the API query cache
func (oc *OctopartClient) GetMarketInfoList(manufacturers, mpns []string) ([]interface{}, error) {
if len(mpns) < 1 {
return nil, Error("no mpns strings passed in")
}
if len(mpns) != len(manufacturers) {
return nil, Error("number of mpns doesn't match number of manufacturers")
}
if len(mpns) > 100 {
return nil, Error("can't handle more than 100 queries at a time (yet)")
}
mpnToQuery := make([]string, 0)
manufacturersToQuery := make([]string, 0)
queryHash := ""
// check for queryHashes in internal cache
for i, _ := range mpns {
queryHash = manufacturers[i] + "|" + mpns[i]
if _, hasKey := oc.infoCache[queryHash]; hasKey != true {
manufacturersToQuery = append(manufacturersToQuery, manufacturers[i])
mpnToQuery = append(mpnToQuery, mpns[i])
}
}
// if necessary, fetch missing queryHashes remotely
if len(mpnToQuery) > 0 {
if _, err := oc.bomApiCall(manufacturersToQuery, mpnToQuery); err != nil {
return nil, err
}
}
// construct list of return info
result := make([]interface{}, len(mpns))
for i, _ := range mpns {
queryHash = manufacturers[i] + "|" + mpns[i]
value, hasKey := oc.infoCache[queryHash]
if hasKey != true {
return nil, Error("key should be in cache, but isn't: " + queryHash)
}
result[i] = value
}
return result, nil
}
func (oc *OctopartClient) GetMarketInfo(manufacturer, mpn string) (map[string]interface{}, error) {
info, err := oc.GetMarketInfoList([]string{manufacturer}, []string{mpn})
if err != nil {
return nil, err
}
return info[0].(map[string]interface{}), nil
}
func (oc *OctopartClient) GetExtraInfo(manufacturer, mpn string) (map[string]string, error) {
marketInfo, err := oc.GetMarketInfo(manufacturer, mpn)
if err != nil {
return nil, err
}
// extract market price, total avail, and "availability factor" from
// market info
log.Println(marketInfo)
ret := make(map[string]string)
ret["MarketPrice"] = marketInfo["avg_price"].(string)
ret["MarketFactor"] = marketInfo["market_availability"].(string)
ret["MarketTotalAvailable"] = marketInfo["total_avail"].(string)
return ret, nil
}
func (oc *OctopartClient) AttachMarketInfo(li *LineItem) error {
if li.AggregateInfo == nil {
li.AggregateInfo = make(map[string]string)
}
extraInfo, err := oc.GetExtraInfo(li.Manufacturer, li.Mpn)
if err != nil {
log.Println(err.Error())
return err
}
for key := range extraInfo {
li.AggregateInfo[key] = string(extraInfo[key])
}
return nil
}
func (oc *OctopartClient) AttachMarketInfoBom(b *Bom) error {
return nil
}
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