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This commit is contained in:
Leonid Fedorov
224
storage-manager/include/messageFormat.h
Executable file → Normal file
224
storage-manager/include/messageFormat.h
Executable file → Normal file
@ -24,79 +24,81 @@
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#include <sys/stat.h>
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#include <stdint.h>
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namespace storagemanager
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{
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wunused-variable"
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#pragma pack(push, 1)
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struct sm_msg_header {
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uint32_t type; // SM_MSG_{START,CONT,END}
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uint32_t payloadLen; // refers to the length of what follows the header
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uint8_t flags; // see below for valid values
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struct sm_msg_header
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{
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uint32_t type; // SM_MSG_{START,CONT,END}
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uint32_t payloadLen; // refers to the length of what follows the header
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uint8_t flags; // see below for valid values
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};
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// current values for the flags field in sm_msg_header
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static const uint8_t CONT = 0x1; // this means another message will follow as part of this request or response
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static const uint8_t CONT =
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0x1; // this means another message will follow as part of this request or response
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struct sm_request {
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sm_msg_header header;
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uint8_t payload[];
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struct sm_request
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{
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sm_msg_header header;
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uint8_t payload[];
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};
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struct sm_response {
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sm_msg_header header;
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ssize_t returnCode; // if < 0 it indicates an error, and payload contains a 4-byte errno value
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uint8_t payload[];
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struct sm_response
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{
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sm_msg_header header;
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ssize_t returnCode; // if < 0 it indicates an error, and payload contains a 4-byte errno value
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uint8_t payload[];
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};
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// all msgs to and from StorageManager begin with this magic and a payload length
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static const uint32_t SM_MSG_START=0xbf65a7e1;
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static const uint32_t SM_MSG_START = 0xbf65a7e1;
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// for read/write/append, which may break a message into chunks, messages not the
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// beginning or end of the larger message will preface a chunk with this magic
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static const uint32_t SM_MSG_CONT=0xfa371bd2;
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// for read/write/append, which may break a message into chunks, messages not the
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// beginning or end of the larger message will preface a chunk with this magic
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static const uint32_t SM_MSG_CONT = 0xfa371bd2;
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// for read/write/append, the last chunk of a message should begin with this magic
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static const uint32_t SM_MSG_END=0x9d5bc31b;
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static const uint32_t SM_MSG_END = 0x9d5bc31b;
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static const uint32_t SM_HEADER_LEN = sizeof(sm_msg_header);
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// the unix socket StorageManager is listening on
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__attribute__ ((unused))
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static const char *socket_name = "\0storagemanager";
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__attribute__((unused)) static const char* socket_name = "\0storagemanager";
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#pragma GCC diagnostic pop
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// opcodes understood by StorageManager. Cast these to
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// a uint8_t to use them.
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enum Opcodes {
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OPEN,
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READ,
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WRITE,
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STAT,
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UNLINK,
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APPEND,
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TRUNCATE,
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LIST_DIRECTORY,
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PING,
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COPY,
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SYNC
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enum Opcodes
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{
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OPEN,
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READ,
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WRITE,
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STAT,
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UNLINK,
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APPEND,
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TRUNCATE,
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LIST_DIRECTORY,
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PING,
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COPY,
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SYNC
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};
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/*
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All commands sent to and from StorageManager begin with
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SM_MSG_START, and a uint32_t for the length of the payload.
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In the payload, all responses from StorageManager begin with
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a return code, which is the same as the corresponding syscall.
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If the return code is an error (usually < 0), then a 4-byte
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value for errno follows. On success, no errno is sent.
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On success, what follows is any output parameters from the call.
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Note: filenames and pathnames in the following parameters should
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be absolute rather than relative.
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*/
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@ -110,15 +112,17 @@ enum Opcodes {
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response format:
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struct stat
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*/
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struct open_cmd {
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uint8_t opcode; // == OPEN
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int32_t openmode;
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uint32_t flen;
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char filename[];
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struct open_cmd
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{
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uint8_t opcode; // == OPEN
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int32_t openmode;
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uint32_t flen;
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char filename[];
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};
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struct open_resp {
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struct stat statbuf;
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struct open_resp
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{
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struct stat statbuf;
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};
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/*
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@ -130,16 +134,17 @@ struct open_resp {
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response format:
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data (size is stored in the return code)
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*/
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struct read_cmd {
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uint8_t opcode; // == READ
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size_t count;
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off_t offset;
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uint32_t flen;
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char filename[];
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struct read_cmd
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{
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uint8_t opcode; // == READ
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size_t count;
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off_t offset;
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uint32_t flen;
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char filename[];
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};
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typedef uint8_t read_resp;
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/*
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WRITE
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-----
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@ -148,14 +153,15 @@ typedef uint8_t read_resp;
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response format:
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*/
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struct write_cmd {
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uint8_t opcode; // == WRITE
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ssize_t count;
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off_t offset;
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uint32_t flen;
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char filename[];
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// after this is the data to be written, ie at &filename[flen]
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};
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struct write_cmd
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{
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uint8_t opcode; // == WRITE
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ssize_t count;
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off_t offset;
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uint32_t flen;
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char filename[];
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// after this is the data to be written, ie at &filename[flen]
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};
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/*
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APPEND
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@ -165,12 +171,13 @@ struct write_cmd {
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response format:
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*/
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struct append_cmd {
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uint8_t opcode; // == APPEND
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ssize_t count;
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uint32_t flen;
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char filename[];
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// after this is the data to be written, ie at &filename[flen]
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struct append_cmd
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{
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uint8_t opcode; // == APPEND
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ssize_t count;
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uint32_t flen;
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char filename[];
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// after this is the data to be written, ie at &filename[flen]
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};
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/*
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@ -181,10 +188,11 @@ struct append_cmd {
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response format:
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*/
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struct unlink_cmd {
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uint8_t opcode; // == UNLINK
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uint32_t flen;
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char filename[];
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struct unlink_cmd
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{
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uint8_t opcode; // == UNLINK
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uint32_t flen;
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char filename[];
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};
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/*
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@ -197,30 +205,33 @@ struct unlink_cmd {
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response format:
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struct stat
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*/
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struct stat_cmd {
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uint8_t opcode; // == STAT
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uint32_t flen;
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char filename[];
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struct stat_cmd
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{
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uint8_t opcode; // == STAT
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uint32_t flen;
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char filename[];
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};
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struct stat_resp {
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struct stat statbuf;
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struct stat_resp
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{
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struct stat statbuf;
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};
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/*
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TRUNCATE
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--------
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command format:
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1-byte opcode|off_t length|4-byte filename length|filename
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response format:
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*/
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struct truncate_cmd {
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uint8_t opcode; // == TRUNCATE
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off_t length;
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uint32_t flen;
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char filename[];
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struct truncate_cmd
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{
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uint8_t opcode; // == TRUNCATE
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off_t length;
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uint32_t flen;
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char filename[];
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};
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/*
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@ -234,21 +245,24 @@ struct truncate_cmd {
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(4-byte filename length|filename) * num elements
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*/
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struct listdir_cmd {
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uint8_t opcode; // == LIST_DIRECTORY
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uint32_t plen;
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char path[];
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struct listdir_cmd
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{
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uint8_t opcode; // == LIST_DIRECTORY
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uint32_t plen;
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char path[];
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};
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struct listdir_resp_entry {
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uint32_t flen;
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char filename[];
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struct listdir_resp_entry
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{
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uint32_t flen;
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char filename[];
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};
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struct listdir_resp {
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uint32_t elements;
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listdir_resp_entry entries[];
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// followed by (elements * listdir_resp_entry)
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struct listdir_resp
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{
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uint32_t elements;
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listdir_resp_entry entries[];
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// followed by (elements * listdir_resp_entry)
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};
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/*
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@ -260,11 +274,12 @@ struct listdir_resp {
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response format:
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nothing yet
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*/
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struct ping_cmd {
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uint8_t opcode;
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struct ping_cmd
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{
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uint8_t opcode;
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};
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/*
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/*
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COPY
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----
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command format:
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@ -273,20 +288,21 @@ struct ping_cmd {
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response format:
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*/
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struct f_name {
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uint32_t flen;
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char filename[];
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struct f_name
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{
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uint32_t flen;
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char filename[];
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};
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struct copy_cmd {
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uint8_t opcode;
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f_name file1;
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// use f_name as an overlay at the end of file1 to get file2.
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struct copy_cmd
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{
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uint8_t opcode;
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f_name file1;
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// use f_name as an overlay at the end of file1 to get file2.
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};
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#pragma pack(pop)
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}
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} // namespace storagemanager
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#endif
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