src/doveadm/doveadm-print-flow.c

/* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "array.h"
#include "ostream.h"
#include "doveadm-print-private.h"

struct doveadm_print_flow_header {
    const char *title;
    enum doveadm_print_header_flags flags;
};

struct doveadm_print_flow_context {
    pool_t pool;
    ARRAY(struct doveadm_print_flow_header) headers;
    unsigned int header_idx;

    bool streaming:1;
};

static struct doveadm_print_flow_context *ctx;

static void
doveadm_print_flow_header(const struct doveadm_print_header *hdr)
{
    struct doveadm_print_flow_header *fhdr;

    fhdr = array_append_space(&ctx->headers);
    fhdr->title = p_strdup(ctx->pool, hdr->title);
    fhdr->flags = hdr->flags;
}

static void flow_next_hdr(void)
{
    if (++ctx->header_idx < array_count(&ctx->headers))
        o_stream_nsend(doveadm_print_ostream, " ", 1);
    else {
        ctx->header_idx = 0;
        o_stream_nsend(doveadm_print_ostream, "\n", 1);
    }
}

static void doveadm_print_flow_print_header(const struct doveadm_print_flow_header *hdr)
{
    if ((hdr->flags & DOVEADM_PRINT_HEADER_FLAG_HIDE_TITLE) == 0) {
        o_stream_nsend_str(doveadm_print_ostream, hdr->title);
        o_stream_nsend(doveadm_print_ostream, "=", 1);
    }
}

static void doveadm_print_flow_print(const char *value)
{
    const struct doveadm_print_flow_header *hdr =
        array_idx(&ctx->headers, ctx->header_idx);

    doveadm_print_flow_print_header(hdr);
    o_stream_nsend_str(doveadm_print_ostream, value);
    flow_next_hdr();
}

static void
doveadm_print_flow_print_stream(const unsigned char *value, size_t size)
{
    const struct doveadm_print_flow_header *hdr =
        array_idx(&ctx->headers, ctx->header_idx);

    if (!ctx->streaming) {
        ctx->streaming = TRUE;
        doveadm_print_flow_print_header(hdr);
    }
    o_stream_nsend(doveadm_print_ostream, value, size);
    if (size == 0) {
        flow_next_hdr();
        ctx->streaming = FALSE;
    }
}

static void doveadm_print_flow_init(void)
{
    pool_t pool;

    pool = pool_alloconly_create("doveadm print flow", 1024);
    ctx = p_new(pool, struct doveadm_print_flow_context, 1);
    ctx->pool = pool;
    p_array_init(&ctx->headers, pool, 16);
}

static void doveadm_print_flow_flush(void)
{
    if (ctx->header_idx != 0) {
        o_stream_nsend(doveadm_print_ostream, "\n", 1);
        ctx->header_idx = 0;
    }
}

static void doveadm_print_flow_deinit(void)
{
    pool_unref(&ctx->pool);
    ctx = NULL;
}

struct doveadm_print_vfuncs doveadm_print_flow_vfuncs = {
    "flow",

    doveadm_print_flow_init,
    doveadm_print_flow_deinit,
    doveadm_print_flow_header,
    doveadm_print_flow_print,
    doveadm_print_flow_print_stream,
    doveadm_print_flow_flush
};