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|
package api
import (
"container/heap"
"context"
"net/http"
"time"
)
type Client struct {
baseURL string
channel chan *Request
ctx context.Context
headers *http.Header
httpClient *http.Client
pq *PriorityQueue
}
func NewClient(ctx context.Context) *Client {
pq := make(PriorityQueue, 0)
heap.Init(&pq)
client := &Client{
baseURL: "https://api.spacetraders.io/v2",
channel: make(chan *Request),
ctx: ctx,
headers: &http.Header{
"Content-Type": {"application/json"},
},
httpClient: &http.Client{
Timeout: time.Minute,
},
pq: &pq,
}
go queueProcessor(client)
return client
}
func (c *Client) Close() {
close(c.channel)
}
func (c *Client) SetToken(token string) {
c.headers.Set("Authorization", "Bearer "+token)
}
func queueProcessor(client *Client) {
var ok bool
for {
// The queue is empty so we do this blocking call
req := <-client.channel
heap.Push(client.pq, req)
// we enqueue all values read from the channel and process the queue's
// contents until empty. We keep reading the channel as long as this
// emptying goes on
for {
select {
case req = <-client.channel:
heap.Push(client.pq, req)
default:
if client.pq.Len() == 0 {
break
}
// we process one
if req, ok = heap.Pop(client.pq).(*Request); !ok {
panic("queueProcessor got something other than a Request on its channel")
}
response, err := client.sendOne(req.method, req.path, req.payload)
req.resp <- &Response{
Response: response,
Err: err,
}
}
}
}
}
|
