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diff --git a/include/crm/common/output.h b/include/crm/common/output.h
index f01564750c..f2221e0dce 100644
--- a/include/crm/common/output.h
+++ b/include/crm/common/output.h
@@ -1,581 +1,552 @@
/*
* Copyright 2019 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#ifndef CRM_OUTPUT__H
# define CRM_OUTPUT__H
#ifdef __cplusplus
extern "C" {
#endif
/**
* \file
* \brief Formatted output for pacemaker tools
*/
# include <stdbool.h>
# include <stdio.h>
# include <libxml/tree.h>
# include <glib.h>
# include <crm/common/results.h>
# define PCMK__API_VERSION "1.0"
-/* Add to the long_options block in each tool to get the formatted output
- * command line options added. Then call pcmk__parse_output_args to handle
- * them.
- */
-# define PCMK__OUTPUT_OPTIONS(fmts) \
- { "output-as", required_argument, NULL, 0, \
- "Specify the format for output, one of: " fmts \
- }, \
- { "output-to", required_argument, NULL, 0, \
- "Specify the destination for formatted output, \"-\" for stdout or a filename" \
- }
-
typedef struct pcmk__output_s pcmk__output_t;
/*!
* \internal
* \brief The type of a function that creates a ::pcmk__output_t.
*
* Instances of this type are passed to pcmk__register_format(), stored in an
* internal data structure, and later accessed by pcmk__output_new(). For
* examples, see pcmk__mk_xml_output() and pcmk__mk_text_output().
*
* \param[in] argv The list of command line arguments.
*/
typedef pcmk__output_t * (*pcmk__output_factory_t)(char **argv);
/*!
* \internal
* \brief The type of a custom message formatting function.
*
* These functions are defined by various libraries to support formatting of
* types aside from the basic types provided by a ::pcmk__output_t.
*
* The meaning of the return value will be different for each message.
* In general, however, 0 should be returned on success and a positive value
* on error.
*
* \note These functions must not call va_start or va_end - that is done
* automatically before the custom formatting function is called.
*/
typedef int (*pcmk__message_fn_t)(pcmk__output_t *out, va_list args);
/*!
* \internal
* \brief Internal type for tracking custom messages.
*
* Each library can register functions that format custom message types. These
* are commonly used to handle some library-specific type. Registration is
* done by first defining a table of ::pcmk__message_entry_t structures and
* then passing that table to pcmk__register_messages(). Separate handlers
* can be defined for the same message, but for different formats (xml vs.
* text). Unknown formats will be ignored.
*/
typedef struct pcmk__message_entry_s {
/*!
* \brief The message to be handled.
*
* This must be the same ID that is passed to the message function of
* a ::pcmk__output_t. Unknown message IDs will be ignored.
*/
const char *message_id;
/*!
* \brief The format type this handler is for.
*
* This name must match the fmt_name of the currently active formatter in
* order for the registered function to be called. It is valid to have
* multiple entries for the same message_id but with different fmt_name
* values.
*/
const char *fmt_name;
/*!
* \brief The function to be called for message_id given a match on
* fmt_name. See comments on ::pcmk__message_fn_t.
*/
pcmk__message_fn_t fn;
} pcmk__message_entry_t;
/*!
* \internal
* \brief This structure contains everything needed to add support for a
* single output formatter to a command line program.
*/
typedef struct pcmk__supported_format_s {
/*!
* \brief The name of this output formatter, which should match the
* fmt_name parameter in some ::pcmk__output_t structure.
*/
const char *name;
/*!
* \brief A function that creates a ::pcmk__output_t.
*/
pcmk__output_factory_t create;
/*!
* \brief Format-specific command line options. This can be NULL if
* no command line options should be supported.
*/
GOptionEntry *options;
} pcmk__supported_format_t;
/* The following three blocks need to be updated each time a new base formatter
* is added.
*/
extern GOptionEntry pcmk__text_output_entries[];
extern GOptionEntry pcmk__xml_output_entries[];
pcmk__output_t *pcmk__mk_text_output(char **argv);
pcmk__output_t *pcmk__mk_xml_output(char **argv);
#define PCMK__SUPPORTED_FORMAT_TEXT { "text", pcmk__mk_text_output, pcmk__text_output_entries }
#define PCMK__SUPPORTED_FORMAT_XML { "xml", pcmk__mk_xml_output, pcmk__xml_output_entries }
/*!
* \brief This structure contains everything that makes up a single output
* formatter.
*
* Instances of this structure may be created by calling pcmk__output_new()
* with the name of the desired formatter. They should later be freed with
* pcmk__output_free().
*/
struct pcmk__output_s {
/*!
* \brief The name of this output formatter.
*/
char *fmt_name;
/*!
* \brief A copy of the request that generated this output.
*
* In the case of command line usage, this would be the command line
* arguments. For other use cases, it could be different.
*/
char *request;
/*!
* \brief Does this formatter support a special quiet mode?
*
* In this mode, most output can be supressed but some information is still
* displayed to an interactive user. In general, machine-readable output
* formats will not support this while user-oriented formats will.
*/
bool supports_quiet;
/*!
* \brief Where output should be written.
*
* This could be a file handle, or stdout or stderr. This is really only
* useful internally.
*/
FILE *dest;
/*!
* \brief Custom messages that are currently registered on this formatter.
*
* Keys are the string message IDs, values are ::pcmk__message_fn_t function
* pointers.
*/
GHashTable *messages;
/*!
* \brief Implementation-specific private data.
*
* Each individual formatter may have some private data useful in its
* implementation. This points to that data. Callers should not rely on
* its contents or structure.
*/
void *priv;
/*!
* \internal
* \brief Take whatever actions are necessary to prepare out for use. This is
* called by pcmk__output_new(). End users should not need to call this.
*
* \note For formatted output implementers - This function should be written in
* such a way that it can be called repeatedly on an already initialized
* object without causing problems, or on a previously finished object
* without crashing.
*
* \param[in,out] out The output functions structure.
*
* \return true on success, false on error.
*/
bool (*init) (pcmk__output_t *out);
/*!
* \internal
* \brief Free the private formatter-specific data.
*
* This is called from pcmk__output_free() and does not typically need to be
* called directly.
*
* \param[in,out] out The output functions structure.
*/
void (*free_priv)(pcmk__output_t *out);
/*!
* \internal
* \brief Take whatever actions are necessary to end formatted output.
*
* This could include flushing output to a file, but does not include freeing
* anything. Note that pcmk__output_free() will automatically call this
* function, so there is typically no need to do so manually.
*
* \note For formatted output implementers - This function should be written in
* such a way that it can be called repeatedly on a previously finished
* object without crashing.
*
* \param[in,out] out The output functions structure.
* \param[in] exit_status The exit value of the whole program.
*/
void (*finish) (pcmk__output_t *out, crm_exit_t exit_status);
/*!
* \internal
* \brief Finalize output and then immediately set back up to start a new set
* of output.
*
* This is conceptually the same as calling finish and then init, though in
* practice more be happening behind the scenes.
*
* \note This function differs from finish in that no exit_status is added.
* The idea is that the program is not shutting down, so there is not
* yet a final exit code. Call finish on the last time through if this
* is needed.
*
* \param[in,out] out The output functions structure.
*/
void (*reset) (pcmk__output_t *out);
/*!
* \internal
* \brief Register a custom message.
*
* \param[in,out] out The output functions structure.
* \param[in] message_id The name of the message to register. This name
* will be used as the message_id parameter to the
* message function in order to call the custom
* format function.
* \param[in] fn The custom format function to call for message_id.
*/
void (*register_message) (pcmk__output_t *out, const char *message_id,
pcmk__message_fn_t fn);
/*!
* \internal
* \brief Call a previously registered custom message.
*
* \param[in,out] out The output functions structure.
* \param[in] message_id The name of the message to call. This name must
* be the same as the message_id parameter of some
* previous call to register_message.
* \param[in] ... Arguments to be passed to the registered function.
*
* \return 0 if a function was registered for the message, that function was
* called, and returned successfully. A negative value is returned if
* no function was registered. A positive value is returned if the
* function was called but encountered an error.
*/
int (*message) (pcmk__output_t *out, const char *message_id, ...);
/*!
* \internal
* \brief Format the output of a completed subprocess.
*
* \param[in,out] out The output functions structure.
* \param[in] exit_status The exit value of the subprocess.
* \param[in] proc_stdout stdout from the completed subprocess.
* \param[in] proc_stderr stderr from the completed subprocess.
*/
void (*subprocess_output) (pcmk__output_t *out, int exit_status,
const char *proc_stdout, const char *proc_stderr);
/*!
* \internal
* \brief Format an informational message that should be shown to
* to an interactive user. Not all formatters will do this.
*
* \note A newline will automatically be added to the end of the format
* string, so callers should not include a newline.
*
* \param[in,out] out The output functions structure.
* \param[in] buf The message to be printed.
* \param[in] ... Arguments to be formatted.
*/
void (*info) (pcmk__output_t *out, const char *format, ...) G_GNUC_PRINTF(2, 3);
/*!
* \internal
* \brief Format already formatted XML.
*
* \param[in,out] out The output functions structure.
* \param[in] name A name to associate with the XML.
* \param[in] buf The XML in a string.
*/
void (*output_xml) (pcmk__output_t *out, const char *name, const char *buf);
/*!
* \internal
* \brief Start a new list of items.
*
* \note For text output, this corresponds to another level of indentation. For
* XML output, this corresponds to wrapping any following output in another
* layer of tags.
*
* \note If singular_noun and plural_noun are non-NULL, calling end_list will
* result in a summary being added.
*
* \param[in,out] out The output functions structure.
* \param[in] name A descriptive, user-facing name for this list.
* \param[in] singular_noun When outputting the summary for a list with
* one item, the noun to use.
* \param[in] plural_noun When outputting the summary for a list with
* more than one item, the noun to use.
*/
void (*begin_list) (pcmk__output_t *out, const char *name,
const char *singular_noun, const char *plural_noun);
/*!
* \internal
* \brief Format a single item in a list.
*
* \param[in,out] out The output functions structure.
* \param[in] name A name to associate with this item.
* \param[in] content The item to be formatted.
*/
void (*list_item) (pcmk__output_t *out, const char *name, const char *content);
/*!
* \internal
* \brief Conclude a list.
*
* \note If begin_list was called with non-NULL for both the singular_noun
* and plural_noun arguments, this function will output a summary.
* Otherwise, no summary will be added.
*
* \param[in,out] out The output functions structure.
*/
void (*end_list) (pcmk__output_t *out);
};
/*!
* \internal
* \brief Call a formatting function for a previously registered message.
*
* \note This function is for implementing custom formatters. It should not
* be called directly. Instead, call out->message.
*
* \param[in,out] out The output functions structure.
* \param[in] message_id The message to be handled. Unknown messages
* will be ignored.
* \param[in] ... Arguments to be passed to the registered function.
*/
int
pcmk__call_message(pcmk__output_t *out, const char *message_id, ...);
/*!
* \internal
* \brief Free a ::pcmk__output_t structure that was previously created by
* pcmk__output_new(). This will first call the finish function.
*
* \note While the create and finish functions are designed in such a way that
* they can be called repeatedly, this function will completely free the
* memory of the object. Once this function has been called, producing
* more output requires starting over from pcmk__output_new().
*
* \param[in,out] out The output structure.
* \param[in] exit_status The exit value of the whole program.
*/
void pcmk__output_free(pcmk__output_t *out, crm_exit_t exit_status);
/*!
* \internal
* \brief Create a new ::pcmk__output_t structure.
*
* \param[in,out] out The destination of the new ::pcmk__output_t.
* \param[in] fmt_name How should output be formatted?
* \param[in] filename Where should formatted output be written to? This
* can be a filename (which will be overwritten if it
* already exists), or NULL or "-" for stdout. For no
* output, pass a filename of "/dev/null".
* \param[in] argv The list of command line arguments.
*
* \return 0 on success or an error code on error.
*/
int pcmk__output_new(pcmk__output_t **out, const char *fmt_name,
const char *filename, char **argv);
-/*!
- * \internal
- * \brief Process formatted output related command line options. This should
- * be called wherever other long options are handled.
- *
- * \param[in] argname The long command line argument to process.
- * \param[in] argvalue The value of the command line argument.
- * \param[out] output_ty How should output be formatted? ("text", "xml", etc.)
- * \param[out] output_dest Where should formatted output be written to? This is
- * typically a filename, but could be NULL or "-".
- *
- * \return true if longname was handled, false otherwise.
- */
-bool
-pcmk__parse_output_args(const char *argname, char *argvalue, char **output_ty,
- char **output_dest);
-
/*!
* \internal
* \brief Register a new output formatter, making it available for use
* the same as a base formatter.
*
* \param[in,out] context A context to add any format-specific options to. This
* can be NULL for use outside of command line programs.
* \param[in] name The name of the format. This will be used to select a
* format from command line options and for displaying help.
* \param[in] create A function that creates a ::pcmk__output_t.
* \param[in] options Format-specific command line options. These will be
* added to the context. This argument can also be NULL.
*
* \return 0 on success or an error code on error.
*/
int
pcmk__register_format(GOptionContext *context, const char *name,
pcmk__output_factory_t create, GOptionEntry *options);
/*!
* \internal
* \brief Register an entire table of output formatters at once.
*
* \param[in,out] context A context to add any format-specific options to. This
* can be NULL for use outside of command line programs.
* \param[in] table An array of ::pcmk__supported_format_t which should
* all be registered. This array must be NULL-terminated.
*
*/
void
pcmk__register_formats(GOptionContext *context, pcmk__supported_format_t *table);
/*!
* \internal
* \brief Register a function to handle a custom message.
*
* \note This function is for implementing custom formatters. It should not
* be called directly. Instead, call out->register_message.
*
* \param[in,out] out The output functions structure.
* \param[in] message_id The message to be handled.
* \param[in] fn The custom format function to call for message_id.
*/
void
pcmk__register_message(pcmk__output_t *out, const char *message_id,
pcmk__message_fn_t fn);
/*!
* \internal
* \brief Register an entire table of custom formatting functions at once.
*
* This table can contain multiple formatting functions for the same message ID
* if they are for different format types.
*
* \param[in,out] out The output functions structure.
* \param[in] table An array of ::pcmk__message_entry_t values which should
* all be registered. This array must be NULL-terminated.
*/
void
pcmk__register_messages(pcmk__output_t *out, pcmk__message_entry_t *table);
/* Functions that are useful for implementing custom message formatters */
/*!
* \internal
* \brief A printf-like function.
*
* This function writes to out->dest and indents the text to the current level
* of the text formatter's nesting. This should be used when implementing
* custom message functions instead of printf.
*
* \param[in,out] out The output functions structure.
*/
void
pcmk__indented_printf(pcmk__output_t *out, const char *format, ...) G_GNUC_PRINTF(2, 3);
/*!
* \internal
* \brief Add the given node as a child of the current list parent. This is
* used when implementing custom message functions.
*
* \param[in,out] out The output functions structure.
* \param[in] node An XML node to be added as a child.
*/
void
pcmk__xml_add_node(pcmk__output_t *out, xmlNodePtr node);
/*!
* \internal
* \brief Push a parent XML node onto the stack. This is used when implementing
* custom message functions.
*
* The XML output formatter maintains an internal stack to keep track of which nodes
* are parents in order to build up the tree structure. This function can be used
* to temporarily push a new node onto the stack. After calling this function, any
* other formatting functions will have their nodes added as children of this new
* parent.
*
* \param[in,out] out The output functions structure.
* \param[in] node The node to be added/
*/
void
pcmk__xml_push_parent(pcmk__output_t *out, xmlNodePtr node);
/*!
* \internal
* \brief Pop a parent XML node onto the stack. This is used when implementing
* custom message functions.
*
* This function removes a parent node from the stack. See pcmk__xml_push_parent()
* for more details.
*
* \note Little checking is done with this function. Be sure you only pop parents
* that were previously pushed. In general, it is best to keep the code between
* push and pop simple.
*
* \param[in,out] out The output functions structure.
*/
void
pcmk__xml_pop_parent(pcmk__output_t *out);
/*!
* \internal
* \brief Peek a parent XML node onto the stack. This is used when implementing
* custom message functions.
*
* This function peeks a parent node on stack. See pcmk__xml_push_parent()
* for more details. It has no side-effect and can be called for an empty stack.
*
* \note Little checking is done with this function.
*
* \param[in,out] out The output functions structure.
*
* \return NULL if stack is empty, otherwise the parent of the stack.
*/
xmlNodePtr
pcmk__xml_peek_parent(pcmk__output_t *out);
#ifdef __cplusplus
}
#endif
#endif
diff --git a/lib/common/output.c b/lib/common/output.c
index 2bcf450955..a9fc6f6016 100644
--- a/lib/common/output.c
+++ b/lib/common/output.c
@@ -1,175 +1,157 @@
/*
* Copyright 2019 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#include <crm/common/util.h>
#include <crm/common/xml.h>
#include <crm/common/internal.h>
#include <crm/common/output.h>
#include <libxml/tree.h>
static GHashTable *formatters = NULL;
void
pcmk__output_free(pcmk__output_t *out, crm_exit_t exit_status) {
pcmk__output_factory_t fn = g_hash_table_lookup(formatters, out->fmt_name);
CRM_ASSERT(fn != NULL);
out->finish(out, exit_status);
out->free_priv(out);
g_hash_table_destroy(out->messages);
free(out->fmt_name);
free(out->request);
free(out);
}
int
pcmk__output_new(pcmk__output_t **out, const char *fmt_name, const char *filename,
char **argv) {
pcmk__output_factory_t create = NULL;;
if (formatters == NULL) {
return EINVAL;
}
/* If no name was given, just try "text". It's up to each tool to register
* what it supports so this also may not be valid.
*/
if (fmt_name == NULL) {
create = g_hash_table_lookup(formatters, "text");
} else {
create = g_hash_table_lookup(formatters, fmt_name);
}
if (create == NULL) {
return pcmk_err_unknown_format;
}
*out = create(argv);
if (*out == NULL) {
return ENOMEM;
}
if (fmt_name == NULL) {
(*out)->fmt_name = strdup("text");
} else {
(*out)->fmt_name = strdup(fmt_name);
}
if (filename == NULL || safe_str_eq(filename, "-")) {
(*out)->dest = stdout;
} else {
(*out)->dest = fopen(filename, "w");
if ((*out)->dest == NULL) {
return errno;
}
}
(*out)->messages = g_hash_table_new_full(crm_str_hash, g_str_equal, free, NULL);
if ((*out)->init(*out) == false) {
pcmk__output_free(*out, 0);
return ENOMEM;
}
return 0;
}
-bool
-pcmk__parse_output_args(const char *argname, char *argvalue, char **output_ty, char **output_dest) {
- if (safe_str_eq("output-as", argname)) {
- *output_ty = argvalue;
- return true;
- } else if (safe_str_eq("output-to", argname)) {
- if (safe_str_eq(argvalue, "-")) {
- *output_dest = NULL;
- } else {
- *output_dest = argvalue;
- }
-
- return true;
- }
-
- return false;
-}
-
int
pcmk__register_format(GOptionContext *context, const char *name,
pcmk__output_factory_t create, GOptionEntry *options) {
if (create == NULL) {
return -EINVAL;
}
if (formatters == NULL) {
formatters = g_hash_table_new_full(crm_str_hash, g_str_equal, NULL, NULL);
}
if (options != NULL && context != NULL) {
char *group_name = crm_strdup_printf("output-%s", name);
char *group_desc = crm_strdup_printf("%s Output Options:", name);
char *group_help = crm_strdup_printf("Show %s output help", name);
GOptionGroup *group = g_option_group_new(group_name, group_desc,
group_help, NULL, NULL);
g_option_group_add_entries(group, options);
g_option_context_add_group(context, group);
free(group_name);
free(group_desc);
free(group_help);
}
g_hash_table_insert(formatters, strdup(name), create);
return 0;
}
void
pcmk__register_formats(GOptionContext *context, pcmk__supported_format_t *formats) {
pcmk__supported_format_t *entry = NULL;
for (entry = formats; entry->name != NULL; entry++) {
pcmk__register_format(context, entry->name, entry->create, entry->options);
}
}
int
pcmk__call_message(pcmk__output_t *out, const char *message_id, ...) {
va_list args;
int rc = 0;
pcmk__message_fn_t fn;
fn = g_hash_table_lookup(out->messages, message_id);
if (fn == NULL) {
return -EINVAL;
}
va_start(args, message_id);
rc = fn(out, args);
va_end(args);
return rc;
}
void
pcmk__register_message(pcmk__output_t *out, const char *message_id,
pcmk__message_fn_t fn) {
g_hash_table_replace(out->messages, strdup(message_id), fn);
}
void
pcmk__register_messages(pcmk__output_t *out, pcmk__message_entry_t *table) {
pcmk__message_entry_t *entry;
for (entry = table; entry->message_id != NULL; entry++) {
if (safe_str_eq(out->fmt_name, entry->fmt_name)) {
pcmk__register_message(out, entry->message_id, entry->fn);
}
}
}

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