/
client.go
236 lines (193 loc) · 5.11 KB
/
client.go
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package http
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"reflect"
"strconv"
"strings"
cmds "github.com/jbenet/go-ipfs/commands"
config "github.com/jbenet/go-ipfs/repo/config"
)
const (
ApiUrlFormat = "http://%s%s/%s?%s"
ApiPath = "/api/v0" // TODO: make configurable
)
// Client is the commands HTTP client interface.
type Client interface {
Send(req cmds.Request) (cmds.Response, error)
}
type client struct {
serverAddress string
}
func NewClient(address string) Client {
return &client{address}
}
func (c *client) Send(req cmds.Request) (cmds.Response, error) {
// save user-provided encoding
previousUserProvidedEncoding, found, err := req.Option(cmds.EncShort).String()
if err != nil {
return nil, err
}
// override with json to send to server
req.SetOption(cmds.EncShort, cmds.JSON)
// stream channel output
req.SetOption(cmds.ChanOpt, "true")
query, err := getQuery(req)
if err != nil {
return nil, err
}
var fileReader *MultiFileReader
var reader io.Reader
if req.Files() != nil {
fileReader = NewMultiFileReader(req.Files(), true)
reader = fileReader
} else {
// if we have no file data, use an empty Reader
// (http.NewRequest panics when a nil Reader is used)
reader = strings.NewReader("")
}
path := strings.Join(req.Path(), "/")
url := fmt.Sprintf(ApiUrlFormat, c.serverAddress, ApiPath, path, query)
httpReq, err := http.NewRequest("POST", url, reader)
if err != nil {
return nil, err
}
// TODO extract string consts?
if fileReader != nil {
httpReq.Header.Set("Content-Type", "multipart/form-data; boundary="+fileReader.Boundary())
httpReq.Header.Set("Content-Disposition", "form-data: name=\"files\"")
} else {
httpReq.Header.Set("Content-Type", "application/octet-stream")
}
version := config.CurrentVersionNumber
httpReq.Header.Set("User-Agent", fmt.Sprintf("/go-ipfs/%s/", version))
httpRes, err := http.DefaultClient.Do(httpReq)
if err != nil {
return nil, err
}
// using the overridden JSON encoding in request
res, err := getResponse(httpRes, req)
if err != nil {
return nil, err
}
if found && len(previousUserProvidedEncoding) > 0 {
// reset to user provided encoding after sending request
// NB: if user has provided an encoding but it is the empty string,
// still leave it as JSON.
req.SetOption(cmds.EncShort, previousUserProvidedEncoding)
}
return res, nil
}
func getQuery(req cmds.Request) (string, error) {
query := url.Values{}
for k, v := range req.Options() {
str := fmt.Sprintf("%v", v)
query.Set(k, str)
}
args := req.Arguments()
argDefs := req.Command().Arguments
argDefIndex := 0
for _, arg := range args {
argDef := argDefs[argDefIndex]
// skip ArgFiles
for argDef.Type == cmds.ArgFile {
argDefIndex++
argDef = argDefs[argDefIndex]
}
query.Add("arg", arg)
if len(argDefs) > argDefIndex+1 {
argDefIndex++
}
}
return query.Encode(), nil
}
// getResponse decodes a http.Response to create a cmds.Response
func getResponse(httpRes *http.Response, req cmds.Request) (cmds.Response, error) {
var err error
res := cmds.NewResponse(req)
contentType := httpRes.Header.Get(contentTypeHeader)
contentType = strings.Split(contentType, ";")[0]
lengthHeader := httpRes.Header.Get(contentLengthHeader)
if len(lengthHeader) > 0 {
length, err := strconv.ParseUint(lengthHeader, 10, 64)
if err != nil {
return nil, err
}
res.SetLength(length)
}
if len(httpRes.Header.Get(streamHeader)) > 0 {
// if output is a stream, we can just use the body reader
res.SetOutput(httpRes.Body)
return res, nil
} else if len(httpRes.Header.Get(channelHeader)) > 0 {
// if output is coming from a channel, decode each chunk
outChan := make(chan interface{})
go func() {
dec := json.NewDecoder(httpRes.Body)
outputType := reflect.TypeOf(req.Command().Type)
for {
var v interface{}
var err error
if outputType != nil {
v = reflect.New(outputType).Interface()
err = dec.Decode(v)
} else {
err = dec.Decode(&v)
}
if err != nil && err != io.EOF {
fmt.Println(err.Error())
return
}
if err == io.EOF {
close(outChan)
return
}
outChan <- v
}
}()
res.SetOutput((<-chan interface{})(outChan))
return res, nil
}
dec := json.NewDecoder(httpRes.Body)
if httpRes.StatusCode >= http.StatusBadRequest {
e := cmds.Error{}
if httpRes.StatusCode == http.StatusNotFound {
// handle 404s
e.Message = "Command not found."
e.Code = cmds.ErrClient
} else if contentType == "text/plain" {
// handle non-marshalled errors
buf := bytes.NewBuffer(nil)
io.Copy(buf, httpRes.Body)
e.Message = string(buf.Bytes())
e.Code = cmds.ErrNormal
} else {
// handle marshalled errors
err = dec.Decode(&e)
if err != nil {
return nil, err
}
}
res.SetError(e, e.Code)
} else {
outputType := reflect.TypeOf(req.Command().Type)
var v interface{}
if outputType != nil {
v = reflect.New(outputType).Interface()
err = dec.Decode(v)
} else {
err = dec.Decode(&v)
}
if err != nil && err != io.EOF {
return nil, err
}
if v != nil {
res.SetOutput(v)
}
}
return res, nil
}