path: root/swarm/api/api_test.go

// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package api

import (
    "errors"
    "fmt"
    "io"
    "io/ioutil"
    "os"
    "testing"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/log"
    "github.com/ethereum/go-ethereum/swarm/storage"
)

func testApi(t *testing.T, f func(*Api)) {
    datadir, err := ioutil.TempDir("", "bzz-test")
    if err != nil {
        t.Fatalf("unable to create temp dir: %v", err)
    }
    os.RemoveAll(datadir)
    defer os.RemoveAll(datadir)
    dpa, err := storage.NewLocalDPA(datadir)
    if err != nil {
        return
    }
    api := NewApi(dpa, nil)
    dpa.Start()
    f(api)
    dpa.Stop()
}

type testResponse struct {
    reader storage.LazySectionReader
    *Response
}

func checkResponse(t *testing.T, resp *testResponse, exp *Response) {

    if resp.MimeType != exp.MimeType {
        t.Errorf("incorrect mimeType. expected '%s', got '%s'", exp.MimeType, resp.MimeType)
    }
    if resp.Status != exp.Status {
        t.Errorf("incorrect status. expected '%d', got '%d'", exp.Status, resp.Status)
    }
    if resp.Size != exp.Size {
        t.Errorf("incorrect size. expected '%d', got '%d'", exp.Size, resp.Size)
    }
    if resp.reader != nil {
        content := make([]byte, resp.Size)
        read, _ := resp.reader.Read(content)
        if int64(read) != exp.Size {
            t.Errorf("incorrect content length. expected '%d...', got '%d...'", read, exp.Size)
        }
        resp.Content = string(content)
    }
    if resp.Content != exp.Content {
        // if !bytes.Equal(resp.Content, exp.Content)
        t.Errorf("incorrect content. expected '%s...', got '%s...'", string(exp.Content), string(resp.Content))
    }
}

// func expResponse(content []byte, mimeType string, status int) *Response {
func expResponse(content string, mimeType string, status int) *Response {
    log.Trace(fmt.Sprintf("expected content (%v): %v ", len(content), content))
    return &Response{mimeType, status, int64(len(content)), content}
}

// func testGet(t *testing.T, api *Api, bzzhash string) *testResponse {
func testGet(t *testing.T, api *Api, bzzhash, path string) *testResponse {
    key := storage.Key(common.Hex2Bytes(bzzhash))
    reader, mimeType, status, err := api.Get(key, path)
    if err != nil {
        t.Fatalf("unexpected error: %v", err)
    }
    quitC := make(chan bool)
    size, err := reader.Size(quitC)
    if err != nil {
        t.Fatalf("unexpected error: %v", err)
    }
    log.Trace(fmt.Sprintf("reader size: %v ", size))
    s := make([]byte, size)
    _, err = reader.Read(s)
    if err != io.EOF {
        t.Fatalf("unexpected error: %v", err)
    }
    reader.Seek(0, 0)
    return &testResponse{reader, &Response{mimeType, status, size, string(s)}}
    // return &testResponse{reader, &Response{mimeType, status, reader.Size(), nil}}
}

func TestApiPut(t *testing.T) {
    testApi(t, func(api *Api) {
        content := "hello"
        exp := expResponse(content, "text/plain", 0)
        // exp := expResponse([]byte(content), "text/plain", 0)
        key, err := api.Put(content, exp.MimeType)
        if err != nil {
            t.Fatalf("unexpected error: %v", err)
        }
        resp := testGet(t, api, key.String(), "")
        checkResponse(t, resp, exp)
    })
}

// testResolver implements the Resolver interface and either returns the given
// hash if it is set, or returns a "name not found" error
type testResolver struct {
    hash *common.Hash
}

func newTestResolver(addr string) *testResolver {
    r := &testResolver{}
    if addr != "" {
        hash := common.HexToHash(addr)
        r.hash = &hash
    }
    return r
}

func (t *testResolver) Resolve(addr string) (common.Hash, error) {
    if t.hash == nil {
        return common.Hash{}, fmt.Errorf("DNS name not found: %q", addr)
    }
    return *t.hash, nil
}

// TestAPIResolve tests resolving URIs which can either contain content hashes
// or ENS names
func TestAPIResolve(t *testing.T) {
    ensAddr := "swarm.eth"
    hashAddr := "1111111111111111111111111111111111111111111111111111111111111111"
    resolvedAddr := "2222222222222222222222222222222222222222222222222222222222222222"
    doesResolve := newTestResolver(resolvedAddr)
    doesntResolve := newTestResolver("")

    type test struct {
        desc      string
        dns       Resolver
        addr      string
        immutable bool
        result    string
        expectErr error
    }

    tests := []*test{
        {
            desc:   "DNS not configured, hash address, returns hash address",
            dns:    nil,
            addr:   hashAddr,
            result: hashAddr,
        },
        {
            desc:      "DNS not configured, ENS address, returns error",
            dns:       nil,
            addr:      ensAddr,
            expectErr: errors.New(`no DNS to resolve name: "swarm.eth"`),
        },
        {
            desc:   "DNS configured, hash address, hash resolves, returns resolved address",
            dns:    doesResolve,
            addr:   hashAddr,
            result: resolvedAddr,
        },
        {
            desc:      "DNS configured, immutable hash address, hash resolves, returns hash address",
            dns:       doesResolve,
            addr:      hashAddr,
            immutable: true,
            result:    hashAddr,
        },
        {
            desc:   "DNS configured, hash address, hash doesn't resolve, returns hash address",
            dns:    doesntResolve,
            addr:   hashAddr,
            result: hashAddr,
        },
        {
            desc:   "DNS configured, ENS address, name resolves, returns resolved address",
            dns:    doesResolve,
            addr:   ensAddr,
            result: resolvedAddr,
        },
        {
            desc:      "DNS configured, immutable ENS address, name resolves, returns error",
            dns:       doesResolve,
            addr:      ensAddr,
            immutable: true,
            expectErr: errors.New(`immutable address not a content hash: "swarm.eth"`),
        },
        {
            desc:      "DNS configured, ENS address, name doesn't resolve, returns error",
            dns:       doesntResolve,
            addr:      ensAddr,
            expectErr: errors.New(`DNS name not found: "swarm.eth"`),
        },
    }
    for _, x := range tests {
        t.Run(x.desc, func(t *testing.T) {
            api := &Api{dns: x.dns}
            uri := &URI{Addr: x.addr, Scheme: "bzz"}
            if x.immutable {
                uri.Scheme = "bzzi"
            }
            res, err := api.Resolve(uri)
            if err == nil {
                if x.expectErr != nil {
                    t.Fatalf("expected error %q, got result %q", x.expectErr, res)
                }
                if res.String() != x.result {
                    t.Fatalf("expected result %q, got %q", x.result, res)
                }
            } else {
                if x.expectErr == nil {
                    t.Fatalf("expected no error, got %q", err)
                }
                if err.Error() != x.expectErr.Error() {
                    t.Fatalf("expected error %q, got %q", x.expectErr, err)
                }
            }
        })
    }
}