loraserver 源码解析 (一) 构建
源码地址
loraserver lorawan netserver，和 gateway通信 与app server交互
lorawan 它用于lorawan通信数据的序列化
安装golang
安装Golang
下载源码
go get -u github.com/brocaar/loraserver
go get -u github.com/brocaar/lorawan由于我的 $GOPATH 是 ~/go/gopath
所以它们最终下载到了 ~/go/gopath/src/github.com/loraserver 和 ~/go/gopath/src/github.com/lorawan
安装依赖库
loraserver lorawan用到了大量的第三方库
loraserver 目录下的 Makefile的 requirements 罗列了所有需要安装的第三方库（好像还是不全哦）
dev-requirements:
go get -u github.com/kisielk/errcheck
go get -u golang.org/x/lint/golint
go get -u github.com/smartystreets/goconvey
go get -u golang.org/x/tools/cmd/stringer
go get -u github.com/golang/protobuf/protoc-gen-go
go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger
go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
go get -u github.com/elazarl/go-bindata-assetfs/...
go get -u github.com/jteeuwen/go-bindata/...
go get -u github.com/golang/dep/cmd/dep
go get -u github.com/goreleaser/goreleaser
go get -u github.com/goreleaser/nfpm 如果你可以爬墙，也许可以直接 make dev-requirements 来安装，说不定就全部装上了。
我不能爬墙，所以 golang.org google.golang.org 等网站是无法通过go get 安装的，会提示类似下面的错误
"golang.org/x/net": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://golang.org/x/net?go-get=1": Get http://golang.org/x/net?go-get=1: dial tcp 216.239.37.1:80: connect: connection refused幸运的是 golang.org google.golang.org 依赖库 在 github 上都有
都在 https://github.com/golang 这里面
我们可以通过 git clone gitbub的代码来曲线安装，具体的操作方法请参考
logrus 安装
go stringer 用法
GoConvey测试框架使用指南
go redis 客户端 这个 redigo 已经被移到 gomodule 仓库， 为了编译 loraserver，我们得下载 https://github.com/garyburd/redigo 的redigo。
redigo
go grpc protobuf 安装
我的安装情况大概是这样的
~/go/gopath/src/github.com/brocaar/loraserver $ make dev-requirements
go get -u github.com/kisielk/errcheck
package golang.org/x/tools/go/packages: unrecognized import path "golang.org/x/tools/go/packages" (https fetch: Get https://golang.org/x/tools/go/packages?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
Makefile:49: recipe for target 'dev-requirements' failed
make: *** [dev-requirements] Error 1
~/go/gopath/src/github.com/brocaar/loraserver $ go get -u golang.org/x/lint/golint
package golang.org/x/lint/golint: unrecognized import path "golang.org/x/lint/golint" (https fetch: Get https://golang.org/x/lint/golint?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
~/go/gopath/src/github.com/brocaar/loraserver $ go get -u github.com/smartystreets/goconvey
~/go/gopath/src/github.com/brocaar/loraserver $ go get -u golang.org/x/tools/cmd/stringer
package golang.org/x/tools/cmd/stringer: unrecognized import path "golang.org/x/tools/cmd/stringer" (https fetch: Get https://golang.org/x/tools/cmd/stringer?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
~/go/gopath/src/github.com/brocaar/loraserver $ go get -u github.com/golang/protobuf/protoc-gen-go
~/go/gopath/src/github.com/brocaar/loraserver $ go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger
package google.golang.org/genproto/googleapis/api/annotations: unrecognized import path "google.golang.org/genproto/googleapis/api/annotations" (https fetch: Get https://google.golang.org/genproto/googleapis/api/annotations?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
~/go/gopath/src/github.com/brocaar/loraserver $ go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
package google.golang.org/genproto/googleapis/api/annotations: unrecognized import path "google.golang.org/genproto/googleapis/api/annotations" (https fetch: Get https://google.golang.org/genproto/googleapis/api/annotations?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
~/go/gopath/src/github.com/brocaar/loraserver $ go get -u github.com/jteeuwen/go-bindata/...
~/go/gopath/src/github.com/brocaar/loraserver $ go get -u github.com/golang/dep/cmd/dep
~/go/gopath/src/github.com/brocaar/loraserver $ go get -u github.com/goreleaser/goreleaser
package golang.org/x/sync/errgroup: unrecognized import path "golang.org/x/sync/errgroup" (https fetch: Get https://golang.org/x/sync/errgroup?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
package golang.org/x/oauth2: unrecognized import path "golang.org/x/oauth2" (https fetch: Get https://golang.org/x/oauth2?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
~/go/gopath/src/github.com/brocaar/loraserver $ go get -u github.com/goreleaser/nfpm
然后开始解决一些被墙了的三方库
到 https://github.com/golang 上面找， 后面的路径是一样的
github.com/kisielk/errcheck
cd $GOPATH/src/golang.org/x
cd $GOPATH/src/golang.org/x
~/go/gopath/src/golang.org/x $ git clone https://github.com/golang/tools.git
Cloning into 'tools'...
remote: Enumerating objects: 107, done.
remote: Counting objects: 100% (107/107), done.
remote: Compressing objects: 100% (84/84), done.
remote: Total 24321 (delta 28), reused 70 (delta 17), pack-reused 24214
Receiving objects: 100% (24321/24321), 11.77 MiB | 191.00 KiB/s, done.
Resolving deltas: 100% (16861/16861), done.
Checking connectivity... done.
下面2个命令很耗时，耐心等待~~~~~
~/go/gopath/src/golang.org/x $ go get -u golang.org/x/tools/go/packages
~/go/gopath/src/golang.org/x $ go get -u github.com/kisielk/errcheck
golang.org/x/lint/golint
~/go/gopath/src/golang.org/x $ git clone https://github.com/golang/lint.git
Cloning into 'lint'...
remote: Enumerating objects: 749, done.
remote: Total 749 (delta 0), reused 0 (delta 0), pack-reused 749
Receiving objects: 100% (749/749), 333.46 KiB | 187.00 KiB/s, done.
Resolving deltas: 100% (442/442), done.
Checking connectivity... done.
~/go/gopath/src/golang.org/x $ go get -u -v golang.org/x/lint/golint
Fetching https://golang.org/x/lint/golint?go-get=1
https fetch failed: Get https://golang.org/x/lint/golint?go-get=1: dial tcp 216.239.37.1:443: i/o timeout
golang.org/x/lint (download)
Fetching https://golang.org/x/lint?go-get=1
https fetch failed: Get https://golang.org/x/lint?go-get=1: dial tcp 216.239.37.1:443: i/o timeout
Fetching https://golang.org/x/tools/go/ast/astutil?go-get=1
https fetch failed: Get https://golang.org/x/tools/go/ast/astutil?go-get=1: dial tcp 216.239.37.1:443: i/o timeout
golang.org/x/tools (download)
Fetching https://golang.org/x/tools/go/gcexportdata?go-get=1
https fetch failed: Get https://golang.org/x/tools/go/gcexportdata?go-get=1: dial tcp 216.239.37.1:443: i/o timeout
Fetching https://golang.org/x/tools/go/internal/gcimporter?go-get=1
https fetch failed: Get https://golang.org/x/tools/go/internal/gcimporter?go-get=1: dial tcp 216.239.37.1:443: i/o timeout
golang.org/x/tools/go/ast/astutil
golang.org/x/lint
golang.org/x/lint/golint 看完日志，我明白了，go get -u 之所以那么慢，是因为总是连接不上，其实我都下载好了的啊。好吧。是不是我git clone就行了，然后如果有需要生成bin文件，我自己手动 go install
golang.org/x/tools/cmd/stringer
x/tools 啊， 我前面已经 git clone 好了，吸取前面的教训，直接安装就行啦
~/go/gopath/src/golang.org/x $ cd $GOPATH/src/golang.org/x/tools/cmd/stringer/
~/go/gopath/src/golang.org/x/tools/cmd/stringer $ go install
搞完后 跑到 $GOPATH/bin ， 是不是多了个 stringer
~/go/gopath/bin $ ls -tl
total 70665
-rwxrwxr-x 1 zlgmcu zlgmcu 6442218 2019-01-25 11:37 stringer
google.golang.org/genproto/googleapis/api/annotations
这个是 装 grpc时 产生的错误
go grpc protobuf 安装 及 用法简单示例
golang.org/x/sync/errgroup
golang.org/x/oauth2
cd $GOPATH/src/golang.org/x/
~/go/gopath/src/golang.org/x $ git clone https://github.com/golang/sync.git
Cloning into 'sync'...
remote: Enumerating objects: 4, done.
remote: Counting objects: 100% (4/4), done.
remote: Compressing objects: 100% (4/4), done.
remote: Total 103 (delta 0), reused 1 (delta 0), pack-reused 99
Receiving objects: 100% (103/103), 40.98 KiB | 0 bytes/s, done.
Resolving deltas: 100% (42/42), done.
Checking connectivity... done.
~/go/gopath/src/golang.org/x $ git clone https://github.com/golang/oauth2.git
Cloning into 'oauth2'...
remote: Enumerating objects: 5, done.
remote: Counting objects: 100% (5/5), done.
remote: Compressing objects: 100% (2/2), done.
remote: Total 1686 (delta 4), reused 3 (delta 3), pack-reused 1681
Receiving objects: 100% (1686/1686), 517.60 KiB | 40.00 KiB/s, done.
Resolving deltas: 100% (1036/1036), done.
Checking connectivity... done.
cloud.google.com/go/pubsub
找了好久，总算找到了，它们全部都在 下面这个链接里
https://github.com/googleapis/google-cloud-go
下载后，拷贝到合适的目录即可
mkdir -p $GOPATH/src/cloud.google.com
cd $GOPATH/src/cloud.google.com
~/go/gopath/src/cloud.google.com $ git clone https://github.com/googleapis/google-cloud-go.git
Cloning into 'google-cloud-go'...
remote: Enumerating objects: 427, done.
remote: Counting objects: 100% (427/427), done.
remote: Compressing objects: 100% (186/186), done.
remote: Total 20434 (delta 266), reused 332 (delta 221), pack-reused 20007
Receiving objects: 100% (20434/20434), 14.46 MiB | 71.00 KiB/s, done.
Resolving deltas: 100% (14029/14029), done.
Checking connectivity... done.
~/go/gopath/src/cloud.google.com $ mv google-cloud-go go
google.golang.org/api/iterator
googleapis go 语言版本在这 https://github.com/googleapis/google-api-go-client
~/go/gopath/src/google.golang.org $ git clone https://github.com/googleapis/google-api-go-client.git
Cloning into 'google-api-go-client'...
remote: Enumerating objects: 1495, done.
remote: Counting objects: 100% (1495/1495), done.
remote: Compressing objects: 100% (973/973), done.
remote: Total 72438 (delta 687), reused 1013 (delta 363), pack-reused 70943
Receiving objects: 100% (72438/72438), 132.27 MiB | 642.00 KiB/s, done.
Resolving deltas: 100% (35349/35349), done.
Checking connectivity... done.
~/go/gopath/src/google.golang.org $ mv google-api-go-client/ api
其它的方法都类似 缺啥装啥
redis 安装
下载 https://redis.io/download redis-4.0.10.tar
tar -xvf redis-4.0.10.tar.gz
make
make test
sudo make install
生成migrations
运行 go generate cmd/loraserver/main.go
会借助 go-bindata 生成 internal/migrations/migrations_gen.go
安装完所有的依赖后 dep ensure -v
在我电脑下显示如下，被墙了，会有2个失败的，忽略即可
The following issues were found in Gopkg.toml:
✗ unable to deduce repository and source type for "google.golang.org/grpc": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://google.golang.org/grpc?go-get=1": Get http://google.golang.org/grpc?go-get=1: dial tcp 216.239.37.1:80: connect: connection refused
✗ unable to deduce repository and source type for "golang.org/x/net": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://golang.org/x/net?go-get=1": Get http://golang.org/x/net?go-get=1: dial tcp 216.239.37.1:80: connect: connection refused
ProjectRoot name validation failed
装loraserver后，我多了这些第三方库
~/go/gopath/src/github.com $ ls
alecthomas fatih grpc-ecosystem lib rubenv
apex fsnotify hashicorp magiconair satori
aws garyburd imdario masterminds sirupsen
blakesmith ghodss jacobsa mattn smartystreets
brocaar golang jmoiron mitchellh spf13
caarlos0 gomodule jteeuwen nsf
campoy google jtolds pelletier
eclipse goreleaser kardianos pkg
elazarl grpc kisielk rogpeppe ~/go/gopath/src $ ls
github.com google.golang.org
golang.org gopkg.in
~/go/gopath/src/golang.org/x $ ls
crypto lint net sys text tools
~/go/gopath/src/google.golang.org $ ls
genproto grpc
~/go/gopath/src/gopkg.in $ ls
gorp.v1 yaml.v2多了这么多程序
~/go/gopath/bin/linux_386 $ ls
cobra gocode protoc-gen-go
dep goconvey protoc-gen-grpc-gateway
errcheck godef protoc-gen-swagger
go-bindata golint stringer
go-bindata-assetfs govendor
尝试编译后会报个语法错误
loraserver 有4个地方用 uuid的时候 没有处理error返回值
dp.DeviceProfile.DeviceProfileID = uuid.NewV4().String()
github.com/satori/go.uuid 目录的 generator.go 改一下
/* raw
func NewV4() (UUID, error) {
return global.NewV4()
}
*/
func NewV4() (UUID) { // modify by wjs, fix loraserver build error
uuid,_ := global.NewV4()
return uuid
}这样改不好，正确的做法我想应该是改 loraserver 源码，判断 error返回值。暂时这么改通过编译吧:)
make build （在loraserver目录）
会在 build 目录下生成 loraserver 程序。
~/go/gopath/src/github.com/brocaar/loraserver $ make build于是生成可执行文件
~/go/gopath/src/github.com/brocaar/loraserver/build $ ls
loraserver
loraserver 源码解析 (二) 运行起来