// tasksearch searches the task list. The search criteria is specified by a query parameter
// of the form text={text} where {text} is matched against the task's value string.
func tasksearch(ctx context.Context, w http.ResponseWriter, req *http.Request) {
tasks := ctx.Value("tasks").(*list.List)
qt := req.URL.Query().Get("text")
if len(qt) <= 0 {
w.WriteHeader(http.StatusBadRequest)
w.Write(mkError("ClientError", "reason", "Missing text parameter"))
return
}
resp := mkEmptylist()
if resp == nil {
panic("can't generate base UBER document")
}
for t, i := tasks.Front(), 0; t != nil; t = t.Next() {
if qt == t.Value.(string) {
resp.appendItem(fmt.Sprintf("task%d", i+1), t.Value.(string))
i++
}
}
bs, err := json.Marshal(resp)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write(mkError("ServerError", "reason", "Cannot read HTTP request body"))
}
w.WriteHeader(http.StatusOK)
w.Write(bs)
}
// Do sends an HTTP request with the provided http.Client and returns an HTTP response.
// If the client is nil, http.DefaultClient is used.
// If the context is canceled or times out, ctx.Err() will be returned.
func Do(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
if client == nil {
client = http.DefaultClient
}
// Request cancelation changed in Go 1.5, see cancelreq.go and cancelreq_go14.go.
cancel := canceler(client, req)
type responseAndError struct {
resp *http.Response
err error
}
result := make(chan responseAndError, 1)
go func() {
resp, err := client.Do(req)
result <- responseAndError{resp, err}
}()
select {
case <-ctx.Done():
cancel()
return nil, ctx.Err()
case r := <-result:
return r.resp, r.err
}
}
// taskcomplete removes a task from the list. It expects a body containing id={task} where
// {task} is the id of the task to be removed.
func taskcomplete(ctx context.Context, w http.ResponseWriter, req *http.Request) {
body, err := ioutil.ReadAll(req.Body)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write(mkError("ServerError", "reason", "Cannot read HTTP request body"))
return
}
re := regexp.MustCompile("id=[[:alpha:]]+([[:digit:]]+)")
sm := re.FindStringSubmatch(string(body))
if sm == nil {
w.WriteHeader(http.StatusBadRequest)
w.Write(mkError("ClientError", "reason", "Unrecognized complete text body"))
return
}
completed := false
taskid, err := strconv.Atoi(sm[1])
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write(mkError("ServerError", "reason", "Cannot read HTTP request body"))
return
}
tasks := ctx.Value("tasks").(*list.List)
if tasks.Len() < taskid {
w.WriteHeader(http.StatusNotFound)
w.Write(mkError("ClientError", "reason", "No such task"))
return
}
for t, i := tasks.Front(), 1; t != nil; t = t.Next() {
if i == taskid {
completed = true
tasks.Remove(t)
}
i++
}
if !completed {
w.WriteHeader(http.StatusNotFound)
w.Write(mkError("ClientError", "reason", "No such task"))
return
}
w.WriteHeader(http.StatusNoContent)
}
// taskadd adds a task to the list.
func taskadd(ctx context.Context, w http.ResponseWriter, req *http.Request) {
body, err := ioutil.ReadAll(req.Body)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write(mkError("ServerError", "reason", "Cannot read HTTP request body"))
return
}
re := regexp.MustCompile("text=(([[:word:]]|[[:space:]])*)")
sm := re.FindStringSubmatch(string(body))
if sm == nil {
w.WriteHeader(http.StatusBadRequest)
w.Write(mkError("ClientError", "reason", "Unrecognized add task body"))
return
}
tasks := ctx.Value("tasks").(*list.List)
tasks.PushBack(sm[1])
w.WriteHeader(http.StatusNoContent)
}
// tasklist responds with the list of tasks.
func tasklist(ctx context.Context, w http.ResponseWriter, req *http.Request) {
tasks := ctx.Value("tasks").(*list.List)
resp := mkEmptylist()
if resp == nil {
panic("can't generate base UBER document")
}
for t, i := tasks.Front(), 0; t != nil; t = t.Next() {
resp.appendItem(fmt.Sprintf("task%d", i+1), t.Value.(string))
i++
}
bs, err := json.Marshal(resp)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write(mkError("ServerError", "reason", "Cannot read HTTP request body"))
return
}
w.WriteHeader(http.StatusOK)
w.Write(bs)
}