mirror of https://github.com/citusdata/citus.git
596 lines
13 KiB
C
596 lines
13 KiB
C
/*
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* psql - the PostgreSQL interactive terminal
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*
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* Copyright (c) 2000-2015, PostgreSQL Global Development Group
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*
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* src/bin/psql/copy.c
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*/
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#include "postgres_fe.h"
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#include "copy.h"
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#include <signal.h>
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#include <sys/stat.h>
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#ifndef WIN32
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#include <unistd.h> /* for isatty */
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#else
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#include <io.h> /* I think */
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#endif
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#include "libpq-fe.h"
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#include "pqexpbuffer.h"
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#include "dumputils.h"
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#include "settings.h"
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#include "common.h"
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#include "prompt.h"
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/*
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* Execute a \copy command (frontend copy). We have to open a file (or execute
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* a command), then submit a COPY query to the backend and either feed it data
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* from the file or route its response into the file.
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*/
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bool
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do_copy(const char *args)
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{
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copy_options *options = NULL;
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PQExpBufferData query = { NULL, 0, 0 };
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FILE *copystream = NULL;
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bool success = false;
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bool fileClosed = false;
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/* parse options */
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options = parse_slash_copy(args);
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if (!options)
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return false;
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/* open file stream to copy data into or out of */
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copystream = OpenCopyStream(options);
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if (copystream == NULL)
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{
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free_copy_options(options);
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return false;
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}
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/* build the command we will send to the backend */
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initPQExpBuffer(&query);
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printfPQExpBuffer(&query, "COPY ");
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appendPQExpBufferStr(&query, options->before_tofrom);
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if (options->from)
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appendPQExpBufferStr(&query, " FROM STDIN ");
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else
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appendPQExpBufferStr(&query, " TO STDOUT ");
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if (options->after_tofrom)
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appendPQExpBufferStr(&query, options->after_tofrom);
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/* run it like a user command, but with copystream as data source/sink */
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pset.copyStream = copystream;
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success = SendQuery(query.data);
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pset.copyStream = NULL;
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termPQExpBuffer(&query);
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/* close file stream */
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fileClosed = CloseCopyStream(options, copystream);
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if (!fileClosed)
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{
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success = false;
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}
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free_copy_options(options);
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return success;
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}
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/*
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* HandleCopyData executes client-side copy data protocols by dispatching the
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* call to the appropriate copy protocol function. On successful execution of
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* the protocol, the function returns true. Otherwise, the function returns
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* false.
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*
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* Please note that we refactored this function from a previous version (v9.1)
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* of PostgreSQL so that copy.c and stage.c could share the same code path. Now
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* that do_copy uses SendQuery(), we should move or re-refactor this function.
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*/
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bool
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HandleCopyData(PGconn *connection, ExecStatusType copyStatus, bool copyIsBinary,
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FILE *copyStream, uint64 copySizeLimit)
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{
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ExecStatusType drainStatus = 0;
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PGresult *drainResult = NULL;
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bool copyOK = true;
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if (copyStatus == PGRES_COPY_OUT)
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{
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SetCancelConn();
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copyOK = handleCopyOut(connection, copyStream, &drainResult);
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ResetCancelConn();
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}
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else if (copyStatus == PGRES_COPY_IN)
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{
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SetCancelConn();
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copyOK = handleCopyIn(connection, copyStream, copyIsBinary,
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&drainResult, copySizeLimit);
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ResetCancelConn();
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}
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else if (copyStatus == PGRES_BAD_RESPONSE ||
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copyStatus == PGRES_NONFATAL_ERROR ||
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copyStatus == PGRES_FATAL_ERROR)
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{
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psql_error("\\copy: %s", PQerrorMessage(connection));
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copyOK = false;
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}
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else
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{
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psql_error("\\copy: unexpected response (%d)\n", copyStatus);
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copyOK = false;
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}
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PQclear(drainResult);
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/*
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* Make sure we drain all results from libpq. Otherwise, the connection may
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* still be in ASYNC_BUSY state, leading to false readings in get_prompt().
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*/
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drainResult = PQgetResult(connection);
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while (drainResult != NULL)
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{
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copyOK = false;
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drainStatus = PQresultStatus(drainResult);
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psql_error("\\copy: unexpected response (%d)\n", drainStatus);
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/* if we are still in COPY IN state, try to get out of it */
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if (drainStatus == PGRES_COPY_IN)
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{
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PQputCopyEnd(connection, _("trying to exit copy mode"));
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}
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PQclear(drainResult);
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drainResult = PQgetResult(connection);
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}
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return copyOK;
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}
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/* Opens input or output stream to be used during copy command. */
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FILE *
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OpenCopyStream(const copy_options *options)
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{
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FILE *copyStream = NULL;
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/* prepare to read or write the target file */
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if (options->file && !options->program)
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canonicalize_path(options->file);
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if (options->from)
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{
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if (options->file)
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{
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if (options->program)
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{
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fflush(stdout);
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fflush(stderr);
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errno = 0;
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copyStream = popen(options->file, PG_BINARY_R);
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}
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else
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copyStream = fopen(options->file, PG_BINARY_R);
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}
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else if (!options->psql_inout)
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copyStream = pset.cur_cmd_source;
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else
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copyStream = stdin;
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}
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else
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{
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if (options->file)
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{
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if (options->program)
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{
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fflush(stdout);
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fflush(stderr);
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errno = 0;
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#ifndef WIN32
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pqsignal(SIGPIPE, SIG_IGN);
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#endif
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copyStream = popen(options->file, PG_BINARY_W);
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}
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else
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copyStream = fopen(options->file, PG_BINARY_W);
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}
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else if (!options->psql_inout)
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copyStream = pset.queryFout;
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else
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copyStream = stdout;
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}
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if (!copyStream)
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{
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if (options->program)
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psql_error("could not execute command \"%s\": %s\n",
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options->file, strerror(errno));
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else
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psql_error("%s: %s\n",
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options->file, strerror(errno));
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return NULL;
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}
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if (!options->program)
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{
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struct stat st;
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int result;
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/* make sure the specified file is not a directory */
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if ((result = fstat(fileno(copyStream), &st)) < 0)
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psql_error("could not stat file \"%s\": %s\n",
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options->file, strerror(errno));
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if (result == 0 && S_ISDIR(st.st_mode))
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psql_error("%s: cannot copy from/to a directory\n",
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options->file);
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if (result < 0 || S_ISDIR(st.st_mode))
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{
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fclose(copyStream);
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return NULL;
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}
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}
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return copyStream;
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}
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/* Closes file stream used during copy command, if any. */
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bool
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CloseCopyStream(const copy_options *options, FILE *copyStream)
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{
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bool success = true;
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if (options->file != NULL)
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{
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if (options->program)
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{
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int pclose_rc = pclose(copyStream);
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if (pclose_rc != 0)
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{
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if (pclose_rc < 0)
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psql_error("could not close pipe to external command: %s\n",
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strerror(errno));
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else
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{
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char *reason = wait_result_to_str(pclose_rc);
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psql_error("%s: %s\n", options->file,
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reason ? reason : "");
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if (reason)
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free(reason);
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}
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success = false;
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}
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#ifndef WIN32
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pqsignal(SIGPIPE, SIG_DFL);
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#endif
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}
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else
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{
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if (fclose(copyStream) != 0)
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{
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psql_error("%s: %s\n", options->file, strerror(errno));
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success = false;
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}
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}
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}
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return success;
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}
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/*
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* Functions for handling COPY IN/OUT data transfer.
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*
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* If you want to use COPY TO STDOUT/FROM STDIN in your application,
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* this is the code to steal ;)
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*/
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/*
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* handleCopyOut
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* receives data as a result of a COPY ... TO STDOUT command
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*
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* conn should be a database connection that you just issued COPY TO on
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* and got back a PGRES_COPY_OUT result.
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* copystream is the file stream for the data to go to.
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* The final status for the COPY is returned into *res (but note
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* we already reported the error, if it's not a success result).
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*
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* result is true if successful, false if not.
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*/
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bool
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handleCopyOut(PGconn *conn, FILE *copystream, PGresult **res)
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{
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bool OK = true;
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char *buf;
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int ret;
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for (;;)
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{
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ret = PQgetCopyData(conn, &buf, 0);
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if (ret < 0)
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break; /* done or server/connection error */
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if (buf)
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{
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if (OK && fwrite(buf, 1, ret, copystream) != ret)
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{
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psql_error("could not write COPY data: %s\n",
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strerror(errno));
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/* complain only once, keep reading data from server */
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OK = false;
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}
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PQfreemem(buf);
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}
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}
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if (OK && fflush(copystream))
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{
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psql_error("could not write COPY data: %s\n",
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strerror(errno));
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OK = false;
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}
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if (ret == -2)
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{
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psql_error("COPY data transfer failed: %s", PQerrorMessage(conn));
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OK = false;
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}
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/*
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* Check command status and return to normal libpq state.
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*
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* If for some reason libpq is still reporting PGRES_COPY_OUT state, we
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* would like to forcibly exit that state, since our caller would be
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* unable to distinguish that situation from reaching the next COPY in a
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* command string that happened to contain two consecutive COPY TO STDOUT
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* commands. However, libpq provides no API for doing that, and in
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* principle it's a libpq bug anyway if PQgetCopyData() returns -1 or -2
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* but hasn't exited COPY_OUT state internally. So we ignore the
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* possibility here.
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*/
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*res = PQgetResult(conn);
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if (PQresultStatus(*res) != PGRES_COMMAND_OK)
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{
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psql_error("%s", PQerrorMessage(conn));
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OK = false;
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}
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return OK;
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}
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/*
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* handleCopyIn
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* sends data to complete a COPY ... FROM STDIN command
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*
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* conn should be a database connection that you just issued COPY FROM on
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* and got back a PGRES_COPY_IN result.
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* copystream is the file stream to read the data from.
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* isbinary can be set from PQbinaryTuples().
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* The final status for the COPY is returned into *res (but note
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* we already reported the error, if it's not a success result).
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*
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* result is true if successful, false if not.
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*/
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/* read chunk size for COPY IN - size set to double that of Hadoop's default */
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#define COPYBUFSIZ 32768
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bool
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handleCopyIn(PGconn *conn, FILE *copystream, bool isbinary,
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PGresult **res, uint64 copySizeLimit)
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{
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bool OK;
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const char *prompt;
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char buf[COPYBUFSIZ];
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uint64 bytesCopied = 0;
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/*
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* Establish longjmp destination for exiting from wait-for-input. (This is
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* only effective while sigint_interrupt_enabled is TRUE.)
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*/
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if (sigsetjmp(sigint_interrupt_jmp, 1) != 0)
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{
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/* got here with longjmp */
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/* Terminate data transfer */
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PQputCopyEnd(conn,
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(PQprotocolVersion(conn) < 3) ? NULL :
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_("canceled by user"));
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OK = false;
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goto copyin_cleanup;
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}
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/* Prompt if interactive input */
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if (isatty(fileno(copystream)))
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{
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if (!pset.quiet)
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puts(_("Enter data to be copied followed by a newline.\n"
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"End with a backslash and a period on a line by itself."));
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prompt = get_prompt(PROMPT_COPY);
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}
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else
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prompt = NULL;
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OK = true;
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if (isbinary)
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{
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/* interactive input probably silly, but give one prompt anyway */
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if (prompt)
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{
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fputs(prompt, stdout);
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fflush(stdout);
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}
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for (;;)
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{
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int buflen;
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/* enable longjmp while waiting for input */
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sigint_interrupt_enabled = true;
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buflen = fread(buf, 1, COPYBUFSIZ, copystream);
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sigint_interrupt_enabled = false;
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if (buflen <= 0)
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break;
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if (PQputCopyData(conn, buf, buflen) <= 0)
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{
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OK = false;
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break;
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}
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/* if size limit is set, copy at most that many bytes*/
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bytesCopied += buflen;
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if (copySizeLimit > 0 && bytesCopied >= copySizeLimit)
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{
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break;
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}
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}
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}
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else
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{
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bool copydone = false;
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while (!copydone)
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{ /* for each input line ... */
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bool firstload;
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bool linedone;
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if (prompt)
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{
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fputs(prompt, stdout);
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fflush(stdout);
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}
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firstload = true;
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linedone = false;
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while (!linedone)
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{ /* for each bufferload in line ... */
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int linelen = 0;
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char *fgresult;
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/* enable longjmp while waiting for input */
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sigint_interrupt_enabled = true;
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fgresult = fgets(buf, sizeof(buf), copystream);
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sigint_interrupt_enabled = false;
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if (!fgresult)
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{
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copydone = true;
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break;
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}
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linelen = strlen(buf);
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/* current line is done? */
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if (linelen > 0 && buf[linelen - 1] == '\n')
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linedone = true;
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/* check for EOF marker, but not on a partial line */
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if (firstload)
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{
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/*
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* This code erroneously assumes '\.' on a line alone
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* inside a quoted CSV string terminates the \copy.
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* http://www.postgresql.org/message-id/E1TdNVQ-0001ju-GO@w
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* rigleys.postgresql.org
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*/
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if (strcmp(buf, "\\.\n") == 0 ||
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strcmp(buf, "\\.\r\n") == 0)
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{
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copydone = true;
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break;
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}
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firstload = false;
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}
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if (PQputCopyData(conn, buf, linelen) <= 0)
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{
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OK = false;
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copydone = true;
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break;
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}
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else
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{
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bytesCopied += linelen;
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}
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}
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if (copystream == pset.cur_cmd_source)
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pset.lineno++;
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/* if size limit is set, copy at most that many bytes */
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if (copySizeLimit > 0 && bytesCopied >= copySizeLimit)
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{
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break;
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}
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}
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}
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/* Check for read error */
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if (ferror(copystream))
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OK = false;
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/*
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* Terminate data transfer. We can't send an error message if we're using
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* protocol version 2.
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*/
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if (PQputCopyEnd(conn,
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(OK || PQprotocolVersion(conn) < 3) ? NULL :
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_("aborted because of read failure")) <= 0)
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OK = false;
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copyin_cleanup:
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/*
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* Check command status and return to normal libpq state.
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*
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* We do not want to return with the status still PGRES_COPY_IN: our
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* caller would be unable to distinguish that situation from reaching the
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* next COPY in a command string that happened to contain two consecutive
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* COPY FROM STDIN commands. We keep trying PQputCopyEnd() in the hope
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* it'll work eventually. (What's actually likely to happen is that in
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* attempting to flush the data, libpq will eventually realize that the
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* connection is lost. But that's fine; it will get us out of COPY_IN
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* state, which is what we need.)
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*/
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while (*res = PQgetResult(conn), PQresultStatus(*res) == PGRES_COPY_IN)
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{
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OK = false;
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PQclear(*res);
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/* We can't send an error message if we're using protocol version 2 */
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PQputCopyEnd(conn,
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(PQprotocolVersion(conn) < 3) ? NULL :
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_("trying to exit copy mode"));
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}
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|
if (PQresultStatus(*res) != PGRES_COMMAND_OK)
|
|
{
|
|
psql_error("%s", PQerrorMessage(conn));
|
|
OK = false;
|
|
}
|
|
|
|
return OK;
|
|
}
|