go语言protoc编译问题-protoc-gen-go: unable to determine Go import path for “searchnode.proto“
go语言protoc编译问题-protoc-gen-go: unable to determine Go import path for “searchnode.proto”
最近换了个电脑，重新配置go语言的开发环境，可是使用protoc编译proto协议文件的时候出现了问题，找了挺久不知道什么原因。最后找到了一个解决办法，具体原因暂时还是不明白，如果有朋友知道的话，也请不吝赐教，感谢。
可在protoc中指定以下参数避免报错。
option go_package = “./SearchNode”;
test.proto
syntax = "proto3";
package VectorSearch.SearchNode; // 指定proto的包名
// option go_package = "./SearchNode"; // 编译为.go文件最好指定的参数
message Item {
string id = 1;
float score = 2;
repeated Field fields = 3;
}
message Field {
string key = 1; // 字段名
string value = 2; // 值
}
message SearchNodeReq {
string request_id = 1; // 请求id
string index_name = 2; // 搜索对应索引名称
int32 cluster_num = 3; // 查询簇数量,
int32 request_num = 4; // 请求数量
repeated float vector = 5; // 搜索向量值
}
message SearchNodeResp {
int32 ret_code = 1; // 返回码
string err_msg = 2; // 错误信息
repeated Item results = 3; // 搜索结果列表
}
service SearchNode {
rpc Search(SearchNodeReq) returns (SearchNodeResp) {}
}
刚开始在文件中没有加上option go_package = “./SearchNode”; -->报错，提示你能导入test.proto文件
运行以下命令都报错
只编译编码部分
protoc -I=. --go_out=. test.proto
编译编码部分和服务代码
protoc -I=. --go_out=plugins=grpc:. test.proto
// 报错信息
$ protoc -I . --go_out=plugins=grpc:. test.proto
protoc-gen-go: unable to determine Go import path for "test.proto"
Please specify either:
• a "go_package" option in the .proto source file, or
• a "M" argument on the command line.
See https://developers.google.com/protocol-buffers/docs/reference/go-generated#package for more information.
--go_out: protoc-gen-go: Plugin failed with status code 1.
后来在文件头部加入
option go_package = "path/package_name"; path指定.go文件放置的路径，package_name表示包名
ps:
option go_package = "./SearchNode"; // path = ./ , package_name=SearchNode
运行以下命令，就可以编译成功了，
protoc -I=PATH指定要在其中搜索
导入的目录 。可以多次指定；
目录将按顺序搜索。如果未
给出，则使用当前工作目录。
指定要使用的插件可执行文件。
protoc -I=. --go_out=plugins=grpc:. searchnode/searchnode.proto
命令解释
-I表示输入位置
--go_out后接的地址表示编译好的.go文件放置地址，plugins=grpc表示会将proto文件中指定的服务编译为接口代码
protoc 命令参数解释
Parse PROTO_FILES and generate output based on the options given:
-IPATH, --proto_path=PATH Specify the directory in which to search for
imports. May be specified multiple times;
directories will be searched in order. If not
given, the current working directory is used.
If not found in any of the these directories,
the --descriptor_set_in descriptors will be
checked for required proto file.
--version Show version info and exit.
-h, --help Show this text and exit.
--encode=MESSAGE_TYPE Read a text-format message of the given type
from standard input and write it in binary
to standard output. The message type must
be defined in PROTO_FILES or their imports.
--decode=MESSAGE_TYPE Read a binary message of the given type from
standard input and write it in text format
to standard output. The message type must
be defined in PROTO_FILES or their imports.
--decode_raw Read an arbitrary protocol message from
standard input and write the raw tag/value
pairs in text format to standard output. No
PROTO_FILES should be given when using this
flag.
--descriptor_set_in=FILES Specifies a delimited list of FILES
each containing a FileDescriptorSet (a
protocol buffer defined in descriptor.proto).
The FileDescriptor for each of the PROTO_FILES
provided will be loaded from these
FileDescriptorSets. If a FileDescriptor
appears multiple times, the first occurrence
will be used.
-oFILE, Writes a FileDescriptorSet (a protocol buffer, --descriptor_set_out=FILE defined in descriptor.proto) containing all of
the input files to FILE.
--include_imports When using --descriptor_set_out, also include
all dependencies of the input files in the
set, so that the set is self-contained.
--include_source_info When using --descriptor_set_out, do not strip
SourceCodeInfo from the FileDescriptorProto.
This results in vastly larger descriptors that
include information about the original
location of each decl in the source file as
well as surrounding comments.
--dependency_out=FILE Write a dependency output file in the format
expected by make. This writes the transitive
set of input file paths to FILE
--error_format=FORMAT Set the format in which to print errors.
FORMAT may be 'gcc' (the default) or 'msvs'
(Microsoft Visual Studio format).
--print_free_field_numbers Print the free field numbers of the messages
defined in the given proto files. Groups share
the same field number space with the parent
message. Extension ranges are counted as
occupied fields numbers.
--plugin=EXECUTABLE Specifies a plugin executable to use.
Normally, protoc searches the PATH for
plugins, but you may specify additional
executables not in the path using this flag.
Additionally, EXECUTABLE may be of the form
NAME=PATH, in which case the given plugin name
is mapped to the given executable even if
the executable's own name differs.
--cpp_out=OUT_DIR Generate C++ header and source.
--csharp_out=OUT_DIR Generate C# source file.
--java_out=OUT_DIR Generate Java source file.
--js_out=OUT_DIR Generate JavaScript source.
--objc_out=OUT_DIR Generate Objective C header and source.
--php_out=OUT_DIR Generate PHP source file.
--python_out=OUT_DIR Generate Python source file.
--ruby_out=OUT_DIR Generate Ruby source file.
@ Read options and filenames from file. If a
relative file path is specified, the file
will be searched in the working directory.
The --proto_path option will not affect how
this argument file is searched. Content of
the file will be expanded in the position of
@ as in the argument list. Note
that shell expansion is not applied to the
content of the file (i.e., you cannot use
quotes, wildcards, escapes, commands, etc.).
Each line corresponds to a single argument,
even if it contains spaces.